FreeCalypso > hg > freecalypso-docs
annotate FC-handset-spec @ 72:2ac10b2cde4f
DUART28-PPD-surprise article written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 19 Jul 2021 05:01:15 +0000 |
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1 FreeCalypso Handset Specification |
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2 ================================= |
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3 |
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4 The purpose of this document is two-fold: |
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5 |
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6 1) This document serves as the principal design specification for the |
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7 FreeCalypso Libre Dumbphone handset hardware which I, Mother Mychaela, |
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8 seek to build. |
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9 |
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10 2) This document also defines the scope of functionality to be supported in |
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11 FreeCalypso handset firmware, including support for additional hardware |
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12 targets beyond the primary FC handset hw target. |
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13 |
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14 1. FC handset hardware specification |
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15 |
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16 1.1. Basic features |
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17 |
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18 The Mother's goal is to produce a replacement for the proprietary Pirelli DP-L10 |
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19 phone, or more specifically, for the GSM-only subset of this Pirelli phone which |
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20 the Mother actually uses, *without* Pirelli's key differentiating feature of |
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21 non-GSM WiFi operation, and without Pirelli's camera. The following hardware |
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22 features are to be included: |
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23 |
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24 * 176x220 pixel color display (no touch) |
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25 * 21-button main keypad |
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26 * 3 side buttons for volume control and an auxiliary function |
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27 * hands-free loudspeaker, also to be used for ringing |
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28 * vibrator |
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29 * USB port that combines charging and computer interface |
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30 * wired analog headset jack |
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31 * single SIM slot |
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32 |
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33 The following features which are commonly found in mainstream proprietary |
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34 phones, particularly more recent ones, will NOT be included: |
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35 |
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36 * camera |
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37 * Bluetooth |
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38 * FM radio |
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39 * MP3 or any other music player |
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40 * stereo headphone output or any other beyond-voice audio |
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41 * TV receiver |
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42 * GPS receiver |
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43 * dual SIM slot |
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44 * torch light beyond LCD and keypad backlights |
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45 |
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46 1.2. RF band capability |
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47 |
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48 Our FC handset needs to be quadband GSM; this quadband capability will be |
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49 achieved by copying the RF section and the core PCB layout around it from the |
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50 reverse-engineered iWOW TR-800 modem module, which is itself a very direct |
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51 (almost verbatim) derivative of TI's Leonardo+ quadband reference design. |
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52 |
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53 1.3. RAM and flash |
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54 |
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55 The Mother's intent is to use Spansion S71PL064JA0 flash+RAM MCP on the final |
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56 handset motherboard, providing 8 MiB of flash and 2 MiB of XRAM in a 7x9 mm |
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57 footprint. This flash and RAM capacity is already known to be fully sufficient |
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58 for our FreeCalypso handset firmware in maximal feature configuration, hence |
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59 any larger capacity would be excessive. However, on our FC Venus development |
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60 board we may use the larger S71PL129NC0 MCP, same as used on FCDEV3B V2. |
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61 |
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62 1.4. Liquid crystal display |
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63 |
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64 1.4.1. Display size |
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65 |
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66 The size of the display for our FC Libre Dumbphone handset design is fixed at |
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67 176x220 pixels, 16-bit color, following TI's D-Sample platform and the starting |
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68 point UI code that was developed for it. Thoughts of changing to a different |
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69 display size have been considered and rejected: |
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70 |
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71 * If we were to change to a smaller display size, we would have to do extra work |
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72 on the firmware to shrink the UI to the smaller size, and we would reduce the |
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73 amount of information that can be displayed at once. We would incur extra |
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74 work and a functional loss, but gain absolutely nothing in return. |
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75 |
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76 * If we were to change to a larger display size (240x320 pixels seems to be the |
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77 largest reasonable size for dumbphones, used in high-end Nokia models), we |
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78 would be venturing into uncertain territory - the greatest uncertainty would |
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79 be the extra CPU load on Calypso to draw the larger UI and to refresh the |
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80 larger framebuffer, which is done with PIO on Calypso, without any DMA |
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81 assistance. The D-Sample LCD size of 176x220 pixels already appears to be a |
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82 strain in some drawing code paths, hence the Mother's decision is to play it |
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83 safe and stick with the known working display size. Expanding the UI to make |
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84 sensible use of larger screen real estate would also entail additional work. |
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85 |
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86 176x220 is the display size in pixels, and this resolution number by itself says |
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87 nothing about the physical display size in inches or mm. However, most readily |
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88 available LCDs that are made for this pixel resolution are made in 2.0" diagonal |
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89 physical size, with 31.68x39.60 mm active area and 0.180 mm dot pitch, hence |
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90 this physical size is the one we are going to use. |
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91 |
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92 1.4.2. Specific LCD module selection |
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93 |
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94 As of 2021-07, the frontrunner candidate LCD module for our FC handset is |
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95 Formike KWH020ST23-F01. Our selection criteria are as follows: |
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96 |
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97 * TFT color LCD, 2.0" diagonal, 176x220 pixel resolution; |
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98 |
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99 * 16-bit microprocessor bus interface; |
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100 |
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101 * 6:00 viewing direction as appropriate for cellular handsets; |
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102 |
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103 * backlight consisting of 3 white LEDs in parallel, joined at the anode, |
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104 with separately brought-out cathodes; |
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105 |
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106 * mechanical design that supports mounting with the FPC tail folded under the |
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107 module, either by way of direct solder termination (no connector) or by way |
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108 of raised sides that create sufficient vertical space to accommodate the FPC |
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109 connector. |
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110 |
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111 The requirement of 16-bit microprocessor bus interface stems from the desire to |
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112 interface this LCD to the Calypso in exactly the same way how TI did it on the |
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113 D-Sample, the 6:00 viewing direction and mechanical mounting requirements stem |
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114 naturally from the target application (cellular phone handset), and the |
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115 backlight LED wiring requirement stems from the constraints of our chosen |
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116 MAX1916 backlight LED driver chip - see section 1.4.4. |
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117 |
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118 Formike KWH020ST23-F01 is an LCD module that was discovered by Mother Mychaela |
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119 in May-June of 2021, and it appears to satisfy all of our requirements. We have |
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120 designed a test board for the purpose of evaluating this LCD (it will connect |
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121 the new LCD to our Luna interface from 2020), but because of Digi-Key part |
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122 backorder issues, the assembly of this board and thus the actual test are being |
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123 delayed until Sep-Oct of 2021. |
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124 |
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125 1.4.3. Backlight and readability considerations |
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126 |
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127 Out of the various pre-existing mobile phones which I (Mychaela) have |
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128 experienced, there have been 3 different kinds of LCDs in terms of how display |
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129 operation and readability interacts with the backlight: |
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130 |
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131 1) older phones with black&white LCDs: on all phones of this type which I've |
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132 ever used, the display is perfectly readable without the backlight given |
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133 ordinary ambient lighting, be it natural daylight or room lighting. Such |
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134 LCDs are called transflective: primarily reflective, but can also operate in |
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135 transmissive mode when the optional backlight is turned on. With these B&W |
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136 displays, you only need to turn on the backlight if you need to operate the |
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137 phone in darkness, such as outdoors at night or inside with all lights off. |
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138 The firmware in such phones is typically designed to leave the actual display |
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139 functional and updated at all times, with only the backlight subject to |
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140 on/off control. |
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141 |
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142 2) most newer phones with color displays, of which Pirelli DP-L10 is a |
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143 representative case, have transmissive LCDs that are not designed to be |
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144 readable without the backlight at all - backlight required for readability |
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145 (BLRR) is another way to describe such LCDs. Because the display is not |
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146 readable at all without the backlight, phone firmware is typically designed |
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147 to turn off the entire display (not just the backlight) when the screen goes |
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148 dark, and operation visible to the user is display on/off, rather than |
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149 backlight on/off. It is a good firmware design practice to "swallow" the |
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150 initial keypress that turns on the display from dark state, i.e., to block |
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151 the regular action of whatever button was pressed to "wake up" the display. |
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152 |
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153 3) The color display on Motorola C139 phones is an odd intermediate case: this |
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154 display is NOT practically readable with the backlight off, yet the firmware |
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155 is designed as if the display were readable in this condition: the actual |
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156 display (unsure if it is CSTN or TFT) remains on and updated, and when you |
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157 press some button to "wake up" the display, that button still takes its |
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158 regular action, which is really bad for usability. How do we know that the |
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159 actual CSTN or TFT display remains on and actively updated when it is not |
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160 readable with the backlight off? Answer: the non-backlit display can be made |
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161 readable by shining a flashlight directly at it - but this trick requires a |
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162 directly pointed flashlight; no amount of ordinary ambient light is enough |
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163 to make the display readable. |
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164 |
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165 Because our FC Libre Dumbphone handset will have a color display (contemporary |
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166 TFT) and because we are sane, not copying the monumental design mistake of Mot |
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167 C139, our display will fall into class 2 by the above classification: backlight |
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168 required for readability, full display on/off rather than just backlight on/off, |
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169 firmware operating like Pirelli's in terms of wake-up keypress swallowing. |
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170 |
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171 1.4.3.1. Backlight dimming mode |
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172 |
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173 Because our LCD is of BLRR type and because we seek to fully replicate Pirelli's |
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174 logic in terms of when keypresses are swallowed and when they are not, we need |
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175 to implement a dimming mode for our LCD backlight. In Pirelli's design which we |
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176 are copying, when you are playing with phone menus or composing SMS etc, but are |
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177 not in an active call, the display switches between full brightness and totally |
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178 off - it goes fully off on timeout, and when you press a button to wake it up, |
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179 it switches on at full brightness, together with the keypad backlight. But when |
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180 you are in a call, when the timer expires (and it's a shorter timer, 10 s |
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181 instead of 30 s), the display goes dim instead of fully off, and in this dimmed |
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182 (but still readable) state keypresses are NOT swallowed. |
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183 |
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184 In terms of absolute requirements, we only need to implement two different |
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185 intensity levels for the LCD backlight: full brightness and in-call dimmed. |
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186 The backlight intensity level in the dimmed state will need to be chosen on |
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187 this principle: use the lowest backlight LED current (to conserve battery power |
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188 and allow longest talk time on one charge) at which the display is still |
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189 readable, similarly to Pirelli's in-call dimmed state. In the user-actively- |
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190 poking state, as opposed to the long-call dimmed state, there is no strict need |
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191 to provide different configurable backlight levels - but it so happens that our |
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192 implementation will allow a total of 4 different backlight intensity levels - |
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193 see section 1.4.4.1. |
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194 |
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195 1.4.4. Backlight circuit implementation |
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196 |
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197 In all candidate TFT LCD modules that are being considered (see section 1.4.2), |
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198 the backlight consists of 3 white LEDs wired in parallel, joined either at the |
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199 anode or at the cathode - although as we shall see momentarily, we require an |
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200 LCD module where the 3 LEDs are joined at the anode, with the 3 cathodes brought |
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201 out separately. LCD module datasheets call for 15 mA current through each LED |
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202 at maximum intensity, for 45 mA total, and the LED forward drop voltage (Vf) at |
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203 this rated current seems to range between 2.9 V (what I actually measured on one |
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204 candidate LCD module) to 3.2 V (what the datasheets list as typical) to perhaps |
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205 as high as 3.4 V (what one datasheet lists as the maximum). |
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206 |
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207 Given the parallel (as opposed to series) wiring of the 3 LEDs and the |
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208 relatively low Vf, there is no need to use any kind of boost converter as part |
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209 of the LED driver circuit for this backlight - any boost converter will only add |
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210 inefficiency (more current will be drawn from the battery for the same LED |
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211 current), hence we need to avoid using such. |
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212 |
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213 Regardless of whether a given phone design uses a boost converter or not (it |
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214 seems that older designs do use boost converters, either because older white |
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215 LEDs have higher Vf or because 2 or 3 LEDs are wired in series), all traditional |
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216 phone designs seem to share the quality where the display backlight brightness |
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217 remains the same as the battery discharges and as Vbat goes down - this quality |
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218 was directly observed on the Pirelli DP-L10 (unknown circuit design) and |
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219 inferred from the available schematics for Mot C139 and C155, with both of the |
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220 latter boost-converting to fixed 5.0 V. In our case, even though we choose to |
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221 not use a boost converter for efficiency reasons, we still need to achieve the |
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222 quality of the display brightness remaining the same through the discharge range |
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223 of our Li-ion battery - having the display dim in half as the battery discharges |
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224 from 4.2 V peak to 3.6-3.7 V plateau is simply not acceptable. |
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225 |
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226 The simplest possible LED driving circuit would be one where a current limiting |
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227 resistor is inserted in series with each LED, and then the 3 parallel |
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228 LED+resistor sets are connected across battery terminals, with a transistor |
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229 inserted somewhere to act as the on/off switch. However, this trivial circuit |
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230 is not suitable in our application because it would produce unacceptably large |
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231 variation in display brightness as the battery discharges - hence we need a more |
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232 intelligent LED driving circuit. Our Luna LCD carrier board from the spring of |
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233 2020 features an LDO bringing Vbat down to fixed 3.5 V, followed by very low- |
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234 value resistors in series with each LED - but this approach is not good for |
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235 production either, as it makes the LED current extremely sensitive to any slight |
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236 variations in Vf. |
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237 |
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238 Fortunately, I was able to find a specialized white LED driver chip that is just |
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239 perfect for our application, or more precisely, a specialized chip that acts as |
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240 a constant current sink for such LEDs - Maxim MAX1916, design from 2001, just |
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241 the right time frame for the kind of phone we are seeking to build. This |
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242 special chip takes the place of "dumb" ballast resistors: connect Vbat (battery |
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243 positive terminal) directly to the common anode of the 3 LEDs, but instead of |
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244 series resistors, connect each cathode to the corresponding LEDn pin of MAX1916 |
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245 - *without* any resistors or transistors! FETs inside the MAX1916 take the |
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246 place of resistors as current-limiting elements, and the chip's global on/off |
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247 control (which will be driven with a Calypso GPIO) takes the place of a separate |
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248 switching transistor. |
41
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249 |
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250 The special quality of MAX1916 is that it produces constant current through each |
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251 LED (based on a set reference current and 230x current multiplication circuit |
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252 inside the chip) regardless of variations in both Vbat and Vf! Of course the |
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253 requested current can only be sustained as long as Vbat >= Vf + Vds_min, where |
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254 Vds_min is the lowest drop voltage of the FETs inside MAX1916, and once Vbat |
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255 falls below this point, the LED current will begin to decline. However, the |
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256 beauty of this design is that no arbitrary artificial turnover points (like the |
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257 3.5 V point in our hacky design from the spring of 2020) need to be set: the |
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258 battery discharge point at which the LED current begins to decline will be |
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259 whatever it comes to be naturally, based on Vf (perhaps depending on |
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260 temperature) and MAX1916 Vds_min, and the decline is expected to be gradual. |
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261 |
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262 1.4.4.1. Backlight current selection and dimming |
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263 |
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264 In the simplest MAX1916-based design, a fixed LED current is set by connecting |
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265 a resistor of appropriately computed value between MAX1916 SET pin and whatever |
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266 regulated fixed voltage rail happens to be available in the system. However, |
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267 in our application (see section 1.4.3.1) we need at least two different display |
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268 brightness levels, and thus at least two switchable LED currents. At first the |
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269 problem seems difficult, but an elegant solution has been found. |
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270 |
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271 LCD backlight LED current will be selected by way of two Calypso GPIO pins |
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272 configured as outputs, and a 74LVC2G125 dual tristate buffer. Each tristate |
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273 buffer's A input will be tied high, and the two Calypso GPIO outputs will be |
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274 connected to buffer output enable inputs. There will be two resistors with |
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275 different carefully computed values, each connected between one of the two |
67
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276 tristate buffer outputs and MAX1916 SET pin. There will also be a third |
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277 resistor connected between MAX1916 SET pin and the V-IO rail. |
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278 |
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279 The values of the 3 just-described resistors will be selected so that the path |
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280 through each SET resistor will add a different contribution to the total LED |
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281 current. The always-on SET resistor will provide the smallest current |
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282 corresponding to the long-call dimmed mode, whereas the sum of all 3 |
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283 contribution currents will equal the 15 mA limit - the current is reckoned per |
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284 LED. The difference between the 15 mA maximum and the small dimmed mode current |
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285 will be split unequally between the two switched SET resistors, allowing a total |
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286 of 4 different backlight intensity levels to be selected via the two Calypso |
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287 GPIO outputs going to the 74LVC2G125 buffer's output enable inputs. The actual |
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288 currents will be determined some time around Sep-Oct of 2021 when we get our |
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289 lunalcd2 test board built. |
41
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290 |
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291 1.4.5. Slight regression relative to Pirelli DP-L10 |
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292 |
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293 The actual LCD backlight LED driving circuit inside the Pirelli phone is not |
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294 known, but reverse engineering of Pirelli's firmware followed by experimentation |
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295 reveals that backlight intensity variation is achieved via a form of PWM, using |
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296 Calypso PWL output - although PWL is used in an inverted sense, such that the |
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297 backlight intensity increases with more 0s being put out on PWL, as opposed to |
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298 more 1s. Thus regardless of the unknown actual circuit implementation, the |
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299 backlight intensity appears to be continuously variable from 1/255 to 255/255, |
67
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300 which is certainly a much richer control than our crude selection of just 4 |
41
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301 possible LED currents. |
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|
302 |
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303 In terms of what Pirelli's fw offers to end users, the backlight intensity in |
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304 the dimmed in-call state is always set to 1/255, without any way to change it, |
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305 whereas the backlight intensity in the active interaction state is selectable |
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306 via a menu among 5 levels; the 5 offered levels turn into 1/255, 64/255, |
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307 128/255, 192/255 and 255/255 in the resulting PWL programming. |
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308 |
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309 So in terms of both hardware capabilities and end user offering via the |
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310 firmware, Pirelli's LCD backlight level control is richer than what we are |
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311 proposing for our FC Libre Dumbphone. However, engineering is all about |
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312 trade-offs and compromises, and in the Mother's opinion, this slight reduction |
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313 in the richness of functionality is sufficiently offset by the efficiency of |
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314 our MAX1916-based approach: aside from the theoretical possibility of a |
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315 switching buck converter, which I've never seen used for LED driving |
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316 applications, our choice of MAX1916 is the most battery-efficient way to drive |
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317 our backlight LEDs. Furthermore, when dimming is effected by switching the |
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318 actual regulated LED current, as in our case, as opposed to applying PWM, our |
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319 backlight becomes more resilient to even lower battery voltages. |
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|
320 |
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321 Consider what happens when Vbat falls below the point at which the design- |
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322 intended LED current can be maintained - what happens then? If no PWM is |
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323 applied, or if PWM is set to maximum, then display brightness will be whatever |
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|
324 maximum is possible at this low battery voltage. But if PWM is applied, |
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325 especially very low duty cycles as in the case of Pirelli's dimmed state, then |
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326 the display that has already been dimmed by low Vbat will be *further* dimmed |
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327 by this aggressive PWM, likely producing an unreadable display at this point. |
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328 It may be possible to compensate via extra complexity in the firmware, by |
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329 turning PWM up when Vbat (as measured via Iota MADC) falls too low - but then |
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330 we would be getting really messy, whereas switching the regulated current is so |
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331 much more elegant. With our approach, low-battery-induced dimming in the "full |
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|
332 brightness" mode will happen at the same discharge point as it would if we had |
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parents:
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|
333 used PWM (and set PWM to maximum in this "full brightness" mode), but in the |
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|
334 in-call dimmed state, further dimming due to low Vbat will probably happen at a |
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335 lower discharge point (if Vf decreases with decreasing current), and when it |
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336 does happen, there won't be a combination of both natural and artificially- |
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337 induced reductions, just the natural one. |
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338 |
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339 Thus based on all of the above considerations, I feel justified in my design |
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340 choice of foregoing PWM control of backlight intensity in favor of fixed current |
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341 switching with much more limited selection. |
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342 |
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343 1.5. Main keypad |
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344 |
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345 The main keypad on our FC Libre Dumbphone handset will have the following |
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346 21-button arrangement: |
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347 |
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348 left soft key ^ right soft key |
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349 <O> |
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350 green call V red power/hang-up |
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351 button button |
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352 |
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353 1 2 3 |
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354 4 5 6 |
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355 7 8 9 |
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356 * 0 # |
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357 |
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358 The top section above the traditional numeric dial buttons (12) consists of left |
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359 and right soft keys, green and red buttons (classically called SEND/END), and a |
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360 5-way navigation button group (left, right, up, down and center), for a total of |
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361 9 buttons in this section. The red hang-up button is also the hardware power-on |
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362 button; having the same button effect power-off when held down for some time is |
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363 a firmware function. |
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364 |
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365 This 21-button main keypad arrangement is exactly the same as featured on |
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366 Motorola C1xx and Pirelli DP-L10 phones, on TI's D-Sample development platform, |
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367 and also on many other phones (non-Calypso) from the appropriate era, such as |
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368 Samsung E2232. |
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369 |
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370 1.5.1. Keypad backlight |
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371 |
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372 All traditional phones including Mot C1xx and Pirelli DP-L10 feature keypad |
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373 backlights, hence we need to include one as well. The exact structure of this |
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374 backlight won't be known until we enter the mechanical design phase for the |
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375 actual handset (as opposed to intermediate development boards), which will be |
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376 much later in the project, but the Mother's understanding is that keypad |
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377 backlights are made up of some number of LEDs (2 on Pirelli DP-L10, unknown |
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378 number on Mot C139) and some kind of light diffuser. |
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379 |
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380 Given the discovery of MAX1916 constant-current-sink LED driver chip (see |
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381 section 1.4.4), the optimal electrical design of the keypad backlight becomes |
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382 clear: use 3 LEDs, and drive them using another MAX1916 chip, separate from the |
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383 one used for the LCD backlight. |
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384 |
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385 Backlight intensity: neither Mot C139 nor Pirelli DP-L10 provides any way to |
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386 vary keypad backlight intensity, and no such variability is deemed necessary. |
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387 In the long-call state when the LCD backlight is dimmed, the keypad backlight |
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388 is fully off. We shall use a fixed LED current setting for our keypad |
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389 backlight, set with a single fixed resistor between the keypad MAX1916 chip's |
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390 SET pin and the V-IO rail, and the actual current value will be determined in a |
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391 much later phase of the project, when we have the actual keypad backlight LEDs |
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392 and a better idea of the mechanical design. |
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393 |
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394 Backlight color: Mot C139 uses blue LEDs, Pirelli DP-L10 uses white LEDs. |
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395 Because blue and white LEDs have very similar electrical characteristics |
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396 (current needed for appropriate brightness, Vf at this current), the choice |
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397 between the two can be made in a much later project phase, based on input from |
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398 other team members who are better at aesthetics. |
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399 |
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400 1.5.1.1. Comparison with Mot C139 and Pirelli DP-L10 |
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401 |
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402 Both of these two pre-existing reference phones feature keypad backlights that |
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403 are switched on/off via Iota LEDB; the actual circuit design is unknown. |
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404 However, in our design we forego Iota LEDB altogether (it won't be used for |
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405 anything), and use two MAX1916 chips for our LCD and keypad backlights, with |
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406 each chip's on/off control being a Calypso GPIO. |
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407 |
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408 The actual workings of the LEDB driver or switch inside the Iota chip are a |
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409 mystery. On the one hand it appears to be nothing more than a "dumb" transistor |
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410 on/off switch, no different from an external "digital transistor" (BJT with bias |
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411 resistors) controlled by a Calypso GPIO: a resistor still seems to be required |
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412 for current control, and at least on the Pirelli DP-L10 the keypad backlight |
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413 intensity visibly varies with Vbat ranging over the Li-ion discharge range. But |
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414 on the other hand, LEDB requires the 13 MHz clock to be running, and the light |
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415 goes out when this clock is stopped. Why in the world would any kind of clock |
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416 be required if the circuit is only a transistor on/off switch controlled by a |
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417 static register bit? Other parts of TI's Iota datasheet describe its LEDA, LEDB |
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418 and LEDC as "current drivers" - but in the absence of any way to actually set |
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419 the desired current without depending on Vbat or Vf variations, whatever the |
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420 Iota chip actually provides can't be anything like MAX1916. |
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421 |
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422 Poorly documented, non-understood mystery hardware is best avoided, hence we are |
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423 not going to use Iota LEDB, and shall only use MAX1916 instead. We also gain a |
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424 functional improvement over Pirelli DP-L10 by using MAX1916: our keypad |
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425 backlight intensity will remain the same over the battery discharge range. |
45
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426 |
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427 1.6. Side buttons |
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428 |
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429 In addition to the 21-button main keypad, our FC Libre Dumbphone handset will |
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430 include 3 side buttons: two on the left side, intended for volume up/down |
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431 control, and one on the right side, serving auxiliary functions. This side |
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432 button arrangement is identical to TI's D-Sample and similar to Pirelli DP-L10: |
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433 the only difference between our arrangement (matching D-Sample) and Pirelli's |
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434 is that Pirelli moved the 3rd side button to the left and designated it as the |
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435 camera button. However, we (FreeCalypso) have no interest in ever implementing |
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436 any kind of camera on our phones, hence we are moving the 3rd side button back |
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437 to where it was in TI's original design (on the right), and we will use it for |
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438 purposes of our own invention. |
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439 |
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440 The starting point UI code we got from TI does not do anything with the right |
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441 side button (even though this button exists and works on the D-Sample platform |
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442 on which this code was originally developed), hence we have full freedom to |
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443 invent our own uses for it. The following uses are envisioned: |
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444 |
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445 * Long press of this button may be our way of turning the hands-free loudspeaker |
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446 on and off, a function that does not exist in the starting point UI code from |
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447 TI. |
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448 |
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449 * When the phone is in its normal idle standby operation (not in a call and not |
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450 being poked at by the user, but registered to a GSM network and ready to |
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451 accept incoming calls or SMS), the display will be off. Users often desire |
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452 to check the time and other status (check coverage, see if they missed any |
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453 calls or SMS), which will require pressing any button to turn on the display. |
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454 At that point a 30 s timer kicks in, which will turn the display back off |
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455 after 30 s of inactivity. However, an argument can be made that keeping the |
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456 display on for 30 s if the user only wanted to quickly glance at the time is |
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457 a waste of battery. Here is one proposed solution: we can implement a |
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458 function where a short press of the right side button when the phone is on its |
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459 idle screen will cause the display to turn off immediately and activate the |
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460 keyguard. The user can then press the right side button once to turn on the |
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461 display and look at it, and then press the same button again to turn it back |
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462 off. |
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463 |
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464 * When we are in a long call, the LCD backlight does not turn off completely, |
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465 instead it will go dim - but still readable. Any button presses in this state |
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466 are NOT swallowed - they take their regular actions. However, the keypad |
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467 backlight turns off fully in this state, and under certain conditions (like |
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468 out at night) the user may not be able to see the keypad. If a short press |
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469 of the right side button invokes no other action besides switching on full |
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470 display brightness and the keypad backlight, this right side button can be |
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471 found by touch, and thus solve this particular problem case. |
46
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472 |
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473 1.7. Audio routing |
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474 |
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475 3 different audio routing modes will be supported on our FC Libre Dumbphone |
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476 handset: |
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|
477 |
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478 * Default mode: there will be a 32 ohm earpiece speaker physically mounted in |
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479 the usual place, on the front bezel above the display, to match up with the |
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480 user's ear in handheld operation. There will also be a microphone toward the |
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481 front bottom of the phone, again in the usual place. |
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482 |
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483 * Hands-free mode: there will be an 8 ohm loudspeaker physically separate from |
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484 the 32 ohm earpiece speaker, physical location in the handset TBD. In the |
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485 hands-free mode, the downlink audio will be switched from the earpiece speaker |
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486 to the loudspeaker, while the microphone input for the uplink will remain the |
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487 same. |
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|
488 |
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489 * There will be a wired analog headset jack with plug insertion detection; when |
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490 a headset is inserted, both audio input and output will be redirected to this |
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491 headset interface. |
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|
492 |
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493 1.7.1. Earpiece and loudspeaker separation |
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|
494 |
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495 Most current mainstream phones (in fact, all that I am familiar with) have |
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496 physically separate speaker transducers for the earpiece function (hold up to |
64
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497 ear to talk) and the loudspeaker+ringer function. The not-so-current and not- |
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498 so-mainstream Pirelli DP-L10 also features the same arrangement. The earpiece |
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499 speaker is a 32 ohm load, and the loudspeaker is an 8 ohm load. In a |
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500 Calypso+Iota design, an external amplifier chip is needed to drive the 8 ohm |
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501 loudspeaker, whereas the little 32 ohm earpiece speaker can be driven directly |
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|
502 by Iota EAR output. |
46
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|
503 |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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504 However, a very different design was implemented by TI on their D-Sample and |
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505 Leonardo boards. They have only one speaker, one of 8 ohm kind, that is |
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|
506 physically mounted in the position where the earpiece speaker would normally go. |
1fec0a3f09cc
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diff
changeset
|
507 In order to not overwhelm the user's ear in handheld operation, they have |
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FC-handset-spec: audio routing documented
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45
diff
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|
508 peculiar circuit wiring where the analog signal from Iota to the loudspeaker |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
509 amplifier goes through different resistor values depending on whether EAR or AUX |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
510 output from Iota is used, and when the EAR output is selected, the high resistor |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
511 values produce attenuation, such that the sound pressure level produced by the |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
512 pressed-to-ear loudspeaker becomes comparable to that produced by a more |
1fec0a3f09cc
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45
diff
changeset
|
513 traditional 32 ohm earpiece speaker. |
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changeset
|
514 |
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diff
changeset
|
515 Furthermore, TI's single speaker design was not limited to their development |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
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|
516 boards. Some years ago I found schematics for some very old LG phone (called |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
517 A316 or B1200, not sure of the correct designation), this phone is from early |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
518 TI era (pre-Calypso, using Ulysse/Nausica/Clara chipset), and it has the same |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
519 arrangement as D-Sample and Leonardo. |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
520 |
1fec0a3f09cc
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45
diff
changeset
|
521 For our own FC Libre Dumbphone, I am going with the separate speakers |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
522 architecture, using physically separate earpiece and loudspeaker transducers. |
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45
diff
changeset
|
523 This architecture feels more native to me, and it will allow for independent |
1fec0a3f09cc
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45
diff
changeset
|
524 tuning of the two audio paths. In my defense, all current mainstream phones |
64
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63
diff
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|
525 seem to use the same architecture, and so does the Pirelli phone that serves as |
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diff
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|
526 my personal reference - the other approach with a single loudspeaker in the |
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|
527 earpiece physical position seems very uncommon. |
46
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45
diff
changeset
|
528 |
1fec0a3f09cc
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45
diff
changeset
|
529 1.7.2. Loudspeaker implementation |
1fec0a3f09cc
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45
diff
changeset
|
530 |
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45
diff
changeset
|
531 The external amplifier chip for driving the 8 ohm loudspeaker will be TI |
65
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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64
diff
changeset
|
532 TPA6203A1, copied from Leonardo schematics and proven good on FCDEV3B. It is a |
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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64
diff
changeset
|
533 "dumb" loudspeaker amplifier, as opposed to a much more complex chip that |
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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diff
changeset
|
534 combines the loudspeaker amplifier function with a MIDI ringtone player - see |
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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64
diff
changeset
|
535 section 1.8. On FCDEV3B this amplifier is fed with signal from Iota EAR output, |
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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diff
changeset
|
536 but on the final handset and on the Venus development board this amplifier will |
153b517ccc7a
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips
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diff
changeset
|
537 be fed with signal from Iota AUX output instead. |
46
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45
diff
changeset
|
538 |
1fec0a3f09cc
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45
diff
changeset
|
539 The loudspeaker amplifier has an on/off control by way of a Calypso GPIO; in |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
540 order to save battery, this amplifier needs to be off normally, and only turn on |
1fec0a3f09cc
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45
diff
changeset
|
541 when a loudspeaker call is in progress or when a ringtone melody is played. |
1fec0a3f09cc
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45
diff
changeset
|
542 |
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45
diff
changeset
|
543 1.7.3. Wired analog headset jack |
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45
diff
changeset
|
544 |
1fec0a3f09cc
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45
diff
changeset
|
545 The analog headset jack on our FC Libre Dumbphone handset will be of 2.5 mm |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
546 TRRS type, using pinout copied from iWOW DSK. The headset needs to be wired as |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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45
diff
changeset
|
547 follows: |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
548 |
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FC-handset-spec: audio routing documented
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45
diff
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|
549 * 32 ohm earpiece speaker connected between Tip and Ring2; |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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parents:
45
diff
changeset
|
550 * electret condenser microphone, positive connected to Ring1; |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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parents:
45
diff
changeset
|
551 * Sleeve is ground, should be needed only for the microphone. |
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FC-handset-spec: audio routing documented
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parents:
45
diff
changeset
|
552 |
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FC-handset-spec: audio routing documented
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parents:
45
diff
changeset
|
553 The advantage of this TRRS headset specification, as opposed to the simpler kind |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
554 with a TRS plug and a common ground for the earpiece and the mic, is that our |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
555 TRRS headset can be driven with either single-ended or differential earpiece |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
556 driver outputs. On the final handset, the wired headset interface will be |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
557 connected to the Iota headset channel (HSMICBIAS, HSMICP, HSO) and thus the |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
558 headset earpiece driver will be single-ended (HSO and GND), but the same headset |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
559 can also be plugged into other FreeCalypso devices in which the jack is wired |
1fec0a3f09cc
FC-handset-spec: audio routing documented
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parents:
45
diff
changeset
|
560 to the main Iota audio channel, with Iota EARP & EARN driving Tip and Ring2 on |
1fec0a3f09cc
FC-handset-spec: audio routing documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
45
diff
changeset
|
561 the TRRS headset jack. |
47
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FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
562 |
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FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
563 1.8. Ringtone generation |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
564 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
565 In terms of the physical sound-emitting element, there are two principal ways |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
566 in which cellphone ringing sounds can be produced: |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
567 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
568 1) The oldest and most classic way is to use a magnetic buzzer controlled by |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
569 Calypso BU/PWT digital output. The buzzer is driven with raw battery voltage |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
570 being switched with a "digital transistor" (BJT with bias resistors), and the |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
571 control input going to the base of the BJT is Calypso BU/PWT output. This |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
572 method is standard in older phones that don't have hands-free loudspeakers: |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
573 since there is no loudspeaker for that other purpose, some loud noise-making |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
574 element needs to be implemented just for ringing, and old-style buzzers are |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
575 the traditional choice. Motorola C1xx lower subfamilies (C11x/12x and |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
576 C139/140) use such buzzers for ringing. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
577 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
578 2) In phones that feature a loudspeaker for hands-free operation, the same |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
579 loudspeaker is also used for ringtone sounding, and the buzzer is eliminated. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
580 Apparently hands-free loudspeakers weren't popular in the Calypso era, thus |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
581 Pirelli DP-L10 is the only known Calypso phone that features one. There is |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
582 also a more bizarre possibility: some phones have replaced the ringing buzzer |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
583 with a loudspeaker, but that speaker is used *only* for playing ringtone |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
584 melodies - no hands-free call feature is offered. This situation exists on |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
585 Motorola C155/156 phones. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
586 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
587 Furthermore, if the physical sound-emitting element is a loudspeaker and not an |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
588 old-fashioned buzzer, and if the chipset is Calypso, as opposed to various newer |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
589 chipsets, then a further distinction arises: |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
590 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
591 2a) Most historical commercial phones that are based on Calypso and use a |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
592 loudspeaker for ringtone sounding, also contain a special ringtone generator |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
593 chip that drives this speaker when a ringtone is played - in other words, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
594 their loudspeaker ringtones do NOT go through the same voice audio path that |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
595 is used for hands-free calls, if the latter feature is offered at all. The |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
596 speciai ringtone generator chip is typically a combined MIDI player and |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
597 loudspeaker driver. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
598 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
599 2b) The much less popular approach is to not implement any extra hardware at all |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
600 that is specifically for ringtone generation, use only the same loudspeaker |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
601 audio path hardware that is already needed for hands-free calls (a simple |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
602 loudspeaker amplifier), generate ringtone melodies in the Calypso DSP |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
603 (Melody E1 or E2), and play them through the regular voice audio path, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
604 routed to the loudspeaker. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
605 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
606 Approach 2b is the least popular one among historical commercial Calypso phones, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
607 but it is the one which I (Mother Mychaela) have selected for our FC Libre |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
608 Dumbphone handset. But let us nonetheless examine the pros and cons of |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
609 different approaches, and see why I have settled on option 2b. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
610 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
611 Buzzer melodies (option 1) are monophonic (the signal carrying the melody to |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
612 the buzzer is a digital square wave, and there is no way to create multiple |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
613 overlapping notes in such a signal), but a decent range of tone frequencies is |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
614 available: the magnetic buzzer hardware can easily produce frequencies all the |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
615 way up to the limit of human hearing, while Calypso PWT produces musical notes |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
616 from F4 through E8 in the scientific pitch notation, or 349 to 5274 Hz. In |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
617 contrast, any tones produced through the 8000 samples/s voice audio path have |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
618 to be below the Nyquist frequency of 4 kHz - according to TI's document, Melody |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
619 E1 notes go from E4 (330 Hz) up to G#7 or 3322 Hz. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
620 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
621 In terms of the richness of possible ringtone melodies that can be played, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
622 option 2a (external MIDI player chip that drives the loudspeaker directly, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
623 without going through Calypso+Iota voice audio path) is the absolute best. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
624 These specialized ringtone generator chips implement full MIDI (128 instruments, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
625 47 drums, up to 64 simultaneous notes, according to one datasheet), and the |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
626 available ringtone melodies for these MIDI chips are very rich - just take a |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
627 Pirelli DP-L10 phone and listen through various ringtone melodies it offers. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
628 All of Pirelli's melodies are stored as *.mid files in their FFS, thus we could |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
629 very easily copy them if we were to adopt a MIDI player chip similar to theirs. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
630 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
631 However, the problem for us with adopting option 2a is that this option would |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
632 introduce significant extra complexity and adversely affect our already long- |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
633 overdue project schedule. There is only one MIDI ringtone player chip for which |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
634 we have enough documentation to attempt such a feat: this chip is Winbond |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
635 W56964, a slightly more capable sibling of the W56940 used in the Pirelli phone. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
636 However, just because we have what at first glance appears to be reasonably |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
637 complete documentation does not mean that it would be a slam dunk! We would |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
638 have to build a separate test board for this chip, connect it to a Caramel2 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
639 motherboard (it needs to connect to Calypso MEMIF), and then spend significant |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
640 time climbing the learning curve and getting this chip to actually work: getting |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
641 it to play melodies, and just as important, getting it into and out of sleep |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
642 modes. In other words, a lot of extra work and time spent just for this part, |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
643 not advancing any other project needs - whereas option 2b eliminates all of this |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
644 extra work. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
645 |
f0419ac0a815
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Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
646 Finally, a philosophical argument can be made that FreeCalypso should be all |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
647 about simplicity, producing a phone that does its job: implement just what is |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
648 needed for a functional phone, and omit unnecessary baggage. An extra hardware |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
649 circuit (a chip connected to Calypso memory bus, no less) and associated |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
650 software complexity that serves absolutely no other purpose except to produce |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
651 ringtones that are "richer" than what the Calypso can produce on its own, and |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
652 does not assist in any way with hands-free loudspeaker operation for calls (it |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
653 is more of a hindrance in that mode), can be seen as an unwelcome burden similar |
f0419ac0a815
FC-handset-spec: ringtone generation documented
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parents:
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diff
changeset
|
654 to other unwelcome burdens which we are already eliminating, like the camera. |
f0419ac0a815
FC-handset-spec: ringtone generation documented
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parents:
46
diff
changeset
|
655 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
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parents:
46
diff
changeset
|
656 In contrast, with our chosen option 2b, we have exactly zero extra hardware |
f0419ac0a815
FC-handset-spec: ringtone generation documented
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parents:
46
diff
changeset
|
657 that is just for ringing: our loudspeaker and its associated driver circuit |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
658 (simple amplifier) is primarily for hands-free calls, and the ability to use |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
659 the same audio path to play ringtone melodies comes literally "for free" with |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
660 the Melody E1 feature built into our Calypso DSP. We already have a selection |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
661 of nice-sounding ringtone melodies in E1 format, lifted from the legendary TSM30 |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
662 source, and software complexity is minimal: the melody playing engine has |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
663 already been implemented by TI, we only need to call RiViera Audio Service API |
f0419ac0a815
FC-handset-spec: ringtone generation documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
46
diff
changeset
|
664 functions. |
48
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
665 |
cb8d43a5023c
FC-handset-spec: vibrator documented
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parents:
47
diff
changeset
|
666 1.9. Vibrator |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
667 |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
668 All traditional cellphones include a vibrator, and ours needs to include one |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
669 too. Our firmware will need to offer the options of being silent, vibrating |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
670 only, ringing only, or ringing and vibrating on an incoming call or SMS - all |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
671 of these options are genuinely useful to a heavy-duty phone user in different |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
672 situations. |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
673 |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
674 In terms of functionality, the vibrator is envisioned as a simple on/off control |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
675 in the hardware, with higher-level "pulse train" functionality implemented in |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
676 the firmware. As far as end user experience goes, the Mother's plan is to copy |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
677 the way the vibrator works on the Pirelli DP-L10. On this to-be-replaced or |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
678 to-be-recreated reference phone, the vibrator works as follows: when an incoming |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
679 call arrives in vibrating alert mode, the firmware turns the vibrator on for |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
680 500 ms, then turns it off for 500 ms, and the cycle endlessly repeats until the |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
681 call is either answered or dropped. This 500 ms on/off cycling is purely a |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
682 firmware function, the hardware control is an on/off switch. |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
683 |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
684 Looking at the hardware implementation of the vibrator driving circuit in the |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
685 Motorola C1xx family and in the Pirelli DP-L10, both designs support a form of |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
686 "analog" control of the vibrator beyond simple on/off. In the Mot C1xx family |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
687 the vibrator is controlled by the output of Iota auxiliary DAC, whereas in the |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
688 Pirelli DP-L10 Calypso BU output has been repurposed to control the vibrator, |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
689 allowing either full-on or PWM driving. However, Pirelli's firmware appears to |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
690 never operate the vibrator in any way other than fully on, and there is no |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
691 evidence of Mot C1xx firmwares applying any analog control to their vibrator |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
692 either. |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
693 |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
694 The Mother's tentative plan for our FC Libre Dumbphone handset is to copy |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
695 Pirelli's approach in both hardware and firmware: repurpose Calypso BU output |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
696 for vibrator control (we won't have a buzzer, see section 1.8), allowing the |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
697 possibility of PWM, but have our firmware only use fully-on and fully-off |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
698 states, at least initially. However, because we won't have a vibrator on our |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
699 Venus development board, only in the final handset, this decision does not have |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
700 to be made right now. |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
701 |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
702 Because our firmware will be designed for a simple on/off vibrator control, |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
703 during fw development on the Venus board it will be trivial to use a LED to |
cb8d43a5023c
FC-handset-spec: vibrator documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
47
diff
changeset
|
704 simulate the vibrator on/off state. |
49
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
705 |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
706 1.10. Battery |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
707 |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
708 The battery in our FC Libre Dumbphone handset will be single-cell Li-ion. It |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
709 goes without saying that this battery will be freely removable and replaceable |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
710 by end users. The specific size, form factor and mAh capacity of this battery |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
711 won't be addressed until later in the project, when we get closer to building |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
712 the actual handset. |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
713 |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
714 Our Calypso+Iota chipset dates from the era when the cellular handset industry |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
715 was transitioning from NiMH to Li-ion batteries, and the Battery Charger |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
716 Interface (BCI) block in the Iota chip supports both battery types, or at least |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
717 TI's documentation claims so. Given that we are going against the mainstream |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
718 society's ideas in so many other ways, I have given thought to the possibility |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
719 of using a NiMH battery instead of Li-ion. However, the problem with using a |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
720 NiMH battery is that we would be going into completely uncharted territory |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
721 without any guidance. In the case of Li-ion batteries the charging process is |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
722 well-understood in both theory and practice, and our FCHG logic based on reverse |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
723 engineering of Pirelli's firmware works well both on the same Pirelli and on |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
724 Motorola C1xx family. In contrast, if we went with NiMH, we would have |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
725 absolutely no guidance in implementing the necessary charging control logic |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
726 (TI's LCC code is useless), causing a huge risk to the project. Furthermore, |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
727 determining the state of charge from Vbat for the purpose of the bars icon is |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
728 already somewhat challenging even with Li-ion, given the relatively flat middle |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
729 part of the discharge curve - and with NiMH we can only expect the problem to be |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
730 even worse, as their discharge curve is said to be even flatter. For these |
38bcb9425df0
FC-handset-state: battery documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
48
diff
changeset
|
731 reasons, we are going to play it safe and stick with Li-ion. |
50
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
732 |
68
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
733 1.10.1. Battery ID resistors or thermistors |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
734 |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
735 In all classic dumbphones from the era which we seek to revive (the ones with |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
736 user-removable batteries), the battery pack (flat pouch) has 3 or 4 contacts |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
737 rather than just 2: in addition to battery +ve and -ve terminals, there are some |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
738 ID resistors or thermistors included. Both Motorola C1xx and Pirelli DP-L10 |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
739 batteries have 3 contacts, and so does Nokia BL-6C battery form factor that was |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
740 copied by FIC/Openmoko. In contrast, cylindrical Li-ion battery cells like |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
741 18650 have no such third terminal. |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
742 |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
743 Because we are deferring our handset battery design to a later project phase |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
744 (not included on the Venus board), we don't know at this time whether or not |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
745 our final handset battery pack will have any ID resistor and/or thermistor |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
746 connected to Iota ADIN1 or ADIN2. Our current FCHG battery charging driver |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
747 does not touch ADIN1 or ADIN2 at all; if we do end up having an ID resistor or |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
748 thermistor and needing to support it, that custom support will have to be added |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
749 at the time of the actual handset design. |
bdc5d8d9fa1f
FC-handset-spec: new section 1.10.1 clarifies battery ID
Mychaela Falconia <falcon@freecalypso.org>
parents:
67
diff
changeset
|
750 |
50
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
751 1.11. Charging circuit |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
752 |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
753 Our FC Libre Dumbphone will feature a USB port (mini-B, device role only, no |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
754 OTG) that combines two logically separate functions: battery charging and |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
755 computer interface. The basic idea of this dual-function USB port comes from |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
756 Pirelli DP-L10, but we are applying significant refinements of our own to this |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
757 general idea, as the following description will make clear. This section |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
|
758 describes the charging function; the computer interface function is described |
da1a2a32c260
FC-handset-spec: USB description started
Mychaela Falconia <falcon@freecalypso.org>
parents:
49
diff
changeset
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759 in section 1.12. |
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760 |
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761 One highly non-standard innovation that will appear on our FC handset will be a |
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762 user-visible mechanical slide switch that will turn the charging circuit on or |
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763 off. The purpose of this charging on/off switch is to make it possible to |
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764 connect USB and have the two ttyUSB devices appear (see section 1.12) without |
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765 presenting a 'charger plug' boot condition to the Calypso+Iota core chipset. |
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766 From an end user perspective, if you only use the USB port for charging and |
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767 don't care about the computer interface function, then leave the charging switch |
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768 always on - USB plug/unplug will mean charger plug/unplug like on any |
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769 conventional phone. Similarly, if you do use the computer interface function to |
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770 connect your phone to a host computer in regular operation, with the firmware |
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771 up and running normally, but you don't mind having the phone also charge from |
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772 your computer every time you connect USB, then likewise leave the charging |
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773 switch always on. However, if you are going to reflash phone firmware or do |
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774 other advanced manipulations using the computer interface, then you will need |
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775 to turn the charging switch off. With the switch off, the USB port becomes a |
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776 computer interface only, without charging. |
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777 |
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778 Past the switch, the battery charging circuit using USB +5V as the charging |
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779 power source will be the most classic one depicted in Figure 4-10 in the Iota |
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780 chip datasheet (TWL3025_SWRS021.pdf), same as in Pirelli DP-L10 and Motorola |
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781 C1xx phones. Presentation of USB +5V to Iota VCHG terminal past the charging |
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782 on/off switch is what will cause the chipset to boot in the 'charger plug' mode, |
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783 or to activate charging functions in the firmware if the phone is already on. |
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784 |
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785 1.12. Computer interface |
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786 |
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787 Our Calypso chip has no native USB, instead the host computer interface of all |
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788 Calypso-based systems consists of two UARTs. On our development boards starting |
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789 with FCDEV3B, we got used to interfacing to both of these UARTs by way of |
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790 FT2232x adapters, a USB to serial adapter that goes from one USB device to two |
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791 UARTs, presenting two ttyUSB devices to a Linux host. For low-level operations |
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792 like flash programming, having just one Calypso UART is sufficient (either of |
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793 the two), but once our regular firmware is up and running, then having both |
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794 Calypso UARTs gives maximum user empowerment: Modem UART carries a classic AT |
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795 command interface complete with CSD, GPRS and GSM 07.10 MUX capabilities, while |
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796 the other UART (IrDA) carries TI's RVTMUX debug and development interface. |
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797 |
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798 Before arriving at our current radical approach with the charging on/off switch, |
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799 for many years previously I was considering a more conservative approach. My |
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800 original idea was to bring out the two Calypso UARTs in very different ways: my |
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801 thought was to bring only the Modem UART to the built-in USB port (by way of a |
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802 built-in single-channel USB-serial chip), and have plugged-in USB always present |
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803 VCHG to the chipset, but route the debug UART (the one most useful in low-level |
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804 development and bring-up) to a special FPC connector that would interface to a |
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805 special debug board, just like Openmoko did on their Neo. Serious development |
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806 work would then require having that debug board attached, while more casual |
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807 users would be able to talk AT commands to the phone via the built-in USB port, |
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808 charging the battery at the same time. |
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|
809 |
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810 What made me change my mind about this design was the realization that I, as the |
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811 most principal user and developer, would end up wanting to have the debug board |
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812 attached all the time, and the need to have it hanging externally, or perhaps |
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813 glued or taped to the back of the phone, would be a huge blemish and |
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814 inconvenience. Back in the days of Openmoko, someone must have had a similar |
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815 experience, as I remember reading about a hack where someone built a debug board |
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816 functional equivalent that fits inside the Neo, in some otherwise unused space. |
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817 |
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818 Hence the new design for our planned FC Libre Dumbphone handset: the USB port |
51
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819 will have a built-in FT2232D (or perhaps FT2232H) subsystem (USB to two UARTs) |
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820 connected to it, interfacing to both Calypso UARTs, while the charging on/off |
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|
821 switch will make it possible to use this interface for low-level development |
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|
822 and bring-up without presenting VCHG to the chipset. In this architecture this |
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823 FT2232x subsystem should be considered the primary "owner" of the handset's USB |
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|
824 port, while the charging function is secondary and optional, enabled or disabled |
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825 with a switch. To put it another way, if our USB port is connected to a regular |
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826 USB host (as opposed to a Dedicated Charging Port power-only source), that USB |
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827 host will always enumerate the FT2232x and see two ttyUSB devices, whereas |
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828 charging may or may not take place depending on the switch setting. |
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829 |
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830 1.12.1. Set of UART signals |
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831 |
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832 The set of signals to be connected between Calypso and FT2232x for the Modem |
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833 UART is almost complete: |
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834 |
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835 USB UART |
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836 DTE signal Calypso signal |
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837 ------------------------------ |
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|
838 TxD RX_MODEM |
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|
839 RxD TX_MODEM |
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|
840 RTS CTS_MODEM |
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841 CTS RTS_MODEM |
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842 DTR GPIO3 |
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|
843 DCD GPIO2 |
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844 RI GPIO8 |
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|
845 |
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846 Only DSR is omitted for the Modem UART channel, all others are included. The |
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847 second debug UART channel is only two wires: |
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|
848 |
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849 USB UART |
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850 DTE signal Calypso signal |
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851 ------------------------------ |
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852 TxD2 RX_IRDA |
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853 RxD2 TX_IRDA |
51
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854 |
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855 However, as shown in the next section, these signals cannot be simply connected |
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856 between Calypso and FT2232x, instead a more complicated scheme needs to be |
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857 implemented. |
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858 |
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859 1.12.2. USB and mobile power domains |
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860 |
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861 Our FC Libre Dumbphone handset will have two principal power domains in it: the |
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862 main battery-powered mobile domain, and the USB domain. This power domain |
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863 situation presents some very significant challenges, a problem generally |
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|
864 referred to as "partial power-down". There are two PPD scenarios to be |
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865 concerned about: |
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866 |
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867 1) In normal operation the phone is mobile and not connected to USB. In this |
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868 state the mobile power domain is on, whereas USB-powered circuits in the |
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869 FT2232x subsystem have no power. The two challenges in this state are: |
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870 |
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871 1a) We need to ensure that no currents flow from the powered-on mobile domain |
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872 into powered-down USB domain circuits, as any such currents would be an |
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873 unacceptable drain on the battery. |
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874 |
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875 1b) Calypso UART inputs that come from the USB domain when the latter is active |
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876 need to have defined logic levels on them when the USB domain has no power: |
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877 no floating, no mid-way levels that would cause higher currents in CMOS |
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878 input structures, and furthermore, some Calypso inputs need to be high in |
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879 this state, while others need to be low. |
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880 |
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881 2) A reverse PPD scenario occurs when the USB domain has power, but the |
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882 Calypso+Iota chipset is in its switched-off state per Iota VRPC. This |
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883 scenario can occur when the charging switch is set to off, or when the |
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884 battery is critically low and undergoing precharge. The main concern in |
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885 this state is to avoid feeding power from the USB domain into the Calypso |
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886 chipset's V-IO rail - our experience on Caramel2 boards conclusively |
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887 demonstrates that Calypso does not like this condition and can behave oddly, |
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888 erratically feeding current into its outputs that are supposed to be low or |
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889 Hi-Z, and thereby erratically turning on various peripherals. |
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890 |
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891 If we were to naively connect our UART signals between Calypso and FT2232x, the |
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892 result would be bad: all of the above concerns would be violated. Instead we |
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893 need to insert carefully designed isolating buffer circuits in both directions. |
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894 |
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895 1.12.2.1. Calypso to FT2232x signal direction |
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896 |
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897 If these signals were connected directly, significant current (in the mA range) |
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898 would flow from Calypso outputs into powered-down FT2232x inputs, which is not |
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899 acceptable. Our solution is to insert an LVC buffer (probably 74LVC541A, for |
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900 the 5 signals that are needed) between Calypso outputs and FT2232x inputs, with |
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901 the buffer powered from USB domain 3.3V supply. With mobile on and USB power |
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902 absent, the LVC buffer's Ioff spec will apply, which is listed in Nexperia's |
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903 74LVC541A datasheet as 0.1 uA typical, 10 uA maximum. |
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904 |
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905 An unfortunate consequence of this design is that in the opposite PPD scenario |
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906 (USB connected to a host, charging switch off, mobile chipset in its off state) |
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907 the inputs to the LVC buffer will float, with FT2232x inputs receiving garbage |
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908 as a result. Adding pull-up resistors to a USB-domain supply would cause other |
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909 problems, hence the Mother's position is that we'll just live with a few |
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910 floating inputs in this particular condition - and it is a condition that |
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911 should not persist for extended lengths of time. There is also a software |
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912 consideration stemming from this floating input situation: when you are doing |
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913 low-level programming and development operations in this state, don't open the |
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914 Modem UART ttyUSB device, and only operate via the other debug UART. The latter |
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915 is a 2-wire UART without any flow control or modem control signals, hence there |
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916 will be less bogosity for the Linux host to see in this state. |
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|
917 |
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918 1.12.2.2. FT2232x to Calypso signal direction |
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919 |
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920 This direction is even more difficult, and we will need to insert two chained |
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|
921 LVC buffers: the signals will first pass through an LVC buffer powered from the |
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922 USB domain, and then through another LVC buffer powered from the Calypso+Iota |
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923 chipset's V-IO rail. There will be pull resistors inserted between the two |
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924 buffers: either pull-up to VBAT (raw battery positive rail) or pull-down to GND, |
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925 depending on the needed signal sense. |
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926 |
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927 The LVC buffer powered from Calypso V-IO is needed in order to prevent current |
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928 feeding into Calypso when the mobile is switched off - the buffer's Ioff spec |
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|
929 will apply. Pull-up and pull-down resistors in front of this buffer are needed |
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930 so that Calypso inputs will receive the desired states when no USB host is |
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931 connected. Pull-ups are being made to VBAT instead of V-IO to eliminate the |
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932 possibility of current feeding into V-IO through these resistors. (Feeding |
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933 from 3.3V logic signals into the battery can't happen when the battery is above |
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934 3.3 V, and if the battery is below 3.3 V, then we are only adding a little to |
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935 the precharge current.) |
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|
936 |
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937 The other LVC buffer (the one powered from USB-domain 3.3V) is needed because |
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|
938 in the absence of this buffer, current will flow through pull-up resistors and |
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|
939 into powered-down FT2232x output pins, the resulting pull-down resistance will |
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|
940 be lower than the pull-up, and the next buffer won't receive the desired logic |
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|
941 level, not to mention unwanted current flowing. With the other LVC buffer |
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|
942 added, that buffer's Ioff spec will apply. |
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|
943 |
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944 The value of pull-up resistors to VBAT will be 22 kOhm. With maximum 15 uA |
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|
945 current flowing through each resistor (worst-case Ioff of one buffer plus |
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|
946 worst-case Ii of the other buffer), the maximum voltage drop on the 22 kOhm |
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|
947 resistor will be 330 mV. In order for the LVC buffer's input structure to not |
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|
948 draw extra current, the input voltage needs to be 2.8 V or higher - thus with |
7933c3a1b5e0
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|
949 22 kOhm resistors we'll keep satisfying this condition until the battery falls |
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|
950 to about 3.1 V, which is below the operational range for switched-on mobile. |
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951 |
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952 One downside of having pull-ups to VBAT (which can be as high as 4.2 V) on |
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|
953 signals that are output from a 3.3V-powered buffer is that when the buffer |
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|
954 output is high, there may be current flowing into that high output (not sourcing |
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|
955 out of it as normally expected), which is a bad condition for CMOS outputs. |
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956 However, this current will be limited to a maximum of about 40 uA |
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|
957 ((4.2-3.3 V) / 22 kOhm), and my feeling is that such small current won't hurt |
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|
958 Nexperia LVC buffers. |
52
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959 |
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960 1.12.2.2.1. Signal pull-up/down directions |
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961 |
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962 Of the 4 UART signals going from FT2232x to Calypso (see section 1.12.1), TxD |
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|
963 and TxD2 MUST be sensed high by Calypso when no USB host is connected, hence |
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|
964 they will need the two chained LVC buffers with pull-ups to VBAT in between, as |
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|
965 described above. RTS and DTR are less critical in that either high or low level |
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|
966 would be acceptable, as long as it is stable and not floating. However, it is |
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|
967 slightly preferable to have DTR pulled up like TxD (to be sensed as logically |
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968 negated), and to have RTS (flow control signal going to CTS_MODEM) pulled down, |
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969 to be sensed as logically asserted. |
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970 |
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971 The approach chosen by the Mother is to have TxD, TxD2 and DTR pulled up to VBAT |
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972 as described above, and to have RTS pulled down to GND. The value of the pull- |
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973 down resistor to GND will be 47 kOhm, and the USB-side-powered LVC buffer can be |
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974 skipped for this signal - that buffer is only needed in order to work correctly |
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975 with the pull-up to VBAT. |
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976 |
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977 With only 3 FT2232x-to-Calypso signals needing to go through a USB-side-powered |
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978 LVC buffer, and with 3 slots remaining available in the 74LVC541A buffer from |
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979 section 1.12.2.1, that one 74LVC541A IC can serve both signal directions (5 |
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980 signals from Calypso to FT2232x and 3 signals going the other way), reducing the |
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981 component count. |
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982 |
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983 1.12.3. Boot control by USB host |
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984 |
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985 Our DUART28C adapter (DUART28 hardware, EEPROM in the 'C' configuration) has a |
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986 nifty feature in the form of CTL1 and CTL2 open drain outputs, intended for |
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987 triggering Iota VRPC boot control signals on Calypso devices, i.e., boot control |
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988 signals from the {PWON, RPWON, nTESTRESET} set. So far none of our FreeCalypso |
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989 development boards bring out RPWON, but both FCDEV3B and Caramel2 feature PWON |
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990 and nTESTRESET controls, and we have an established convention for driving them |
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991 with CTL1 and CTL2 from a DUART28C. The end effect for the developer-operator |
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992 is that one can run operations based on Calypso boot ROM loading path (fc-iram, |
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993 fc-loadtool etc) purely from the host command line, without needing to press any |
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994 buttons on the development board: adding -Prts to the command line is equivalent |
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995 to pressing PWON, or adding -Pdtr is equivalent to pressing RESET. rvinterf can |
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996 also be run with the same options, allowing flashed firmware to be booted in a |
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997 similar no-buttons-needed manner. |
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998 |
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999 It is the Mother's intent to replicate this boot control feature on our FC Libre |
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1000 Dumbphone handset as well, i.e., make FT2232x Channel B RTS and DTR outputs |
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1001 (otherwise unused) act as host-driven boot control triggers. In hardware terms, |
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1002 this addition consists of just one tiny IC (74LVC2G07) and two pull-up resistors |
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1003 on the BDBUS[24] lines from FT2232x to this OD buffer. FT2232x EEPROM will be |
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1004 programmed with the same custom USB ID as DUART28C, and the Linux kernel |
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1005 ftdi_sio driver will need to have our DUART28C support patch added to it. |
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1006 |
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1007 There will be one change from our previous convention, however: the OD buffer |
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1008 output controlled with Channel B RTS will be wired to RPWON rather than PWON; |
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1009 the other OD buffer output controlled with Channel B DTR will still be wired to |
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1010 nTESTRESET like before. The reason for this change is that our handset firmware |
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1011 has more complex logic that treats different boot causes differently (as |
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1012 required for standard expected handset functionality), and Iota PWON is now |
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1013 reserved solely for the end user power-on button. Host-commanded boot needs to |
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1014 be different from this end user power-on button (no long press is required, and |
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1015 the firmware should enter its misc boot state that behaves like an ACI build), |
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1016 hence we are changing the wiring so that -Prts will trigger RPWON rather than |
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1017 PWON. The same boot effect can still be achieved with -Pdtr triggering |
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1018 nTESTRESET, but it is a bigger hammer (reset of RTC can be unwanted), hence |
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1019 -Prts will be recommended as the gentler option, leaving -Pdtr for times when |
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1020 recovery from runaway code is needed. |
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1021 |
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1022 2. FC handset firmware functional scope specification |
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1023 |
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1024 FreeCalypso handset firmware will always run (perhaps with subset functionality) |
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1025 on more hardware targets than just our main-goal FC Libre Dumbphone handset. It |
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1026 already does: our firmware currently runs on our Luna development platform, and |
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1027 prior to FC it ran on TI's original D-Sample platform. A very restricted |
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1028 functional subset also runs on Motorola C139 hardware. |
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|
1029 |
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1030 If we consider only the main goal of FC Libre Dumbphone handset, then our |
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1031 firmware evolution can be seen as strictly linear: we start with what we got |
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1032 from TI, and we morph it toward what will be needed to operate our handset, |
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1033 adding functionality and peripheral support which we need for our FC handset, |
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1034 but which is not present in the starting point code from TI. However, we also |
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1035 have side-branch functionality: at times when the code from TI supports |
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1036 something which we don't need for our own FC handset, but which may be useful |
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1037 for alien hardware targets, a moral imperative can be made for keeping and at |
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|
1038 least minimally maintaining that functionality as a kind of side-branch feature, |
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1039 a permitted configuration that is not needed for our own FC handset but needed |
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1040 for others. Similarly, when we add support for entirely new peripherals that |
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1041 are planned for our FC handset (such as the loudspeaker), we should make the |
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1042 firmware change in such a way that targets without the extra feature can still |
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1043 be supported. Finally, when we are changing the firmware in ways that |
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1044 significantly depart from TI's original, it may sometimes be prudent to preserve |
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1045 TI's original way as a lorekeeping option. |
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|
1046 |
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1047 The following sections will spell out what we support and what we don't support |
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1048 in FreeCalypso handset firmware, and how these scoping decisions relate to our |
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1049 starting point from TI, to our main goal of FC Libre Dumbphone handset, and to |
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1050 secondary objectives of alien target support and lorekeeping. |
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|
1051 |
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1052 2.1. Display support |
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|
1053 |
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1054 2.1.1. Support for different display sizes |
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|
1055 |
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1056 By the very nature of the problem, any phone handset UI design will always be |
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1057 quite specific to a particular display size in pixels, and also to the display |
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1058 type as in color or black&white. The starting point code we got from TI |
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|
1059 supports 3 different UI configurations in terms of size and coloration: |
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|
1060 |
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|
1061 * 176x220 pixel, 16-bit color; |
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1062 * 176x220 pixel B&W; |
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1063 * 84x48 pixel B&W. |
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|
1064 |
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1065 In FreeCalypso we have made two changes to this set of possible UI |
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1066 configurations: |
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|
1067 |
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1068 1) The large (176x220 pixel) B&W option has been removed. In TI's delivery this |
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1069 option was nothing more than a quick&dirty hack to extend their small (84x48 |
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|
1070 pixel) B&W UI to the large D-Sample screen, and this configuration offers |
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1071 nothing useful - any real display of such large size will always be color. |
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|
1072 |
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1073 2) The small B&W configuration has been extended from 84x48 to 96x64 pixels. |
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1074 Why 96x64? Because it is the size in pixels of Motorola C139 LCD, and it is |
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1075 the smallest LCD size found among those alien Calypso phones whose existence |
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1076 is known to us and for which we have at least minimal support. Extending |
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1077 this UI configuration from 84x48 to 96x64 pixels was an easy change because |
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1078 it is an increase in screen real estate (not a decrease), and it is a fairly |
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1079 small increment, such that UI design choices which were sensible for an 84x48 |
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1080 pixel display are still sensible for 96x64. |
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1081 |
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1082 The main principal difference between our approach in FreeCalypso and what a |
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1083 conventional commercial phone manufacturer would have done is that we are |
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1084 retaining TI's smallbw configuration and keeping it supported, as opposed to |
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1085 disregarding it and working only on the bigcolor UI config for our own planned |
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1086 hardware product. We keep this smallbw UI configuration around, in the extended |
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1087 96x64 pixel size, for two reasons: |
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1088 |
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1089 1) Lorekeeping: unlike TI's 176x220 pixel B&W config that was totally |
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1090 uninteresting, TI's old smallbw UI (from the days of C-Sample) is |
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1091 sufficiently interesting and unique (and naturally quite different from the |
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1092 bigcolor version) to be worth preserving. |
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1093 |
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1094 2) By keeping this configuration around (not discarding it and not allowing it |
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1095 to bitrot beyond repair), we keep the door open for the possibility of a |
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1096 minimally usable FreeCalypso Lite aftermarket firmware for Motorola C139. |
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1097 |
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1098 Both UI configurations can be built for our current Luna platform, and both of |
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1099 them display on our Luna LCD. The virtual framebuffer of 96x64 pix B&W in the |
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1100 smallbw config is displayed in the center of our physical 176x220 pixel color |
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1101 LCD, surrounded by a pale magenta border. The same ability to run both configs |
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1102 will continue on our next development board (Venus). |
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1103 |
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1104 2.1.2. Backlight readability paradigm |
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1105 |
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1106 (See theoretical background in section 1.4.3.) |
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1107 |
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1108 Our actively maintained FC handset firmware has been paradigmatically redesigned |
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1109 to assume a display which is NOT readable without the backlight. Our logical |
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1110 primitives with respect to display control are display on/off, rather than |
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1111 backlight on/off, and we swallow the initial keypress that turns on the display. |
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1112 |
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1113 This change is a significant departure from TI's original. The LCD on TI's |
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1114 D-Sample is transflective, and when the backlight is off, the display remains |
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1115 readable in ambient light. It is certainly better in this regard than Motorola |
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1116 C139 LCD. And if we go back further in TI's history to C-Sample and earlier, |
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1117 those 84x48 pixel B&W LCDs were the traditional mostly-reflective type, |
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1118 perfectly readable without the backlight. |
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1119 |
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1120 This area is one where we are NOT retaining TI's original way as an option in |
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1121 our actively maintained firmware. The difference between the two principal |
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1122 paradigms is too great, and we don't have any active-demand prospective targets |
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1123 with B&W displays of the old traditional kind. |
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1124 |
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1125 2.2. Keypad assumptions |
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1126 |
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1127 The keypad arrangement on our FC handset (see sections 1.5 and 1.6) will be |
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1128 exactly the same as on TI's D-Sample, thus no principal changes to the firmware |
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1129 are needed in this regard. Furthermore, the same 21-button keypad exists on |
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1130 Motorola C1xx phones, thus no firmware design variations are needed in this |
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1131 regard for secondary target support. |
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1132 |
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1133 The only issue of concern is that the 3 side buttons which exist on D-Sample and |
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1134 Pirelli DP-L10 and will also exist on our FC handset don't exist on Mot C1xx. |
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1135 Our starting point code from TI does not do anything with these buttons (even |
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1136 though it was developed on the D-Sample platform where they exist), but when we |
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1137 do get around to adding support for these side buttons, we will need to take |
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1138 some extra care in preserving flexibility: |
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1139 |
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1140 * The original code from TI uses navigation up/down buttons for volume control, |
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1141 for both ringer and earpiece volume. We are going to change the code to drive |
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1142 these volume controls with side buttons instead (dedicated volume up/down |
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1143 buttons), but when we make this change, we'll need to provide an option of |
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1144 restoring the old way for less button-equipped phones like Mot C1xx. |
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1145 |
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1146 * Whatever functions we assign to the right side button, all of them will be |
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1147 our own inventions, as none exist in TI's original code. However, this right |
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1148 side button does not exist on Mot C1xx. The Mother's idea is to assign the |
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1149 right side button to loudspeaker on/off control - this arrangement will work |
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1150 well as the same C1xx phones that lack this button also lack the hands-free |
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1151 loudspeaker. |
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1152 |
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1153 2.2.1. No support for 18-button main keypads |
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1154 |
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1155 Prior to D-Sample, TI's C-Sample and earlier boards had keypads with fewer |
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1156 buttons, 18 instead of 21, and no side buttons. The difference between the |
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1157 C-Sample 18-button main keypad and the 21-button one found on D-Sample, Pirelli |
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1158 DP-L10 and Motorola C1xx is that the older 18-button keypad has only up and down |
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1159 navigation buttons in the place where the 21-button version has a 5-way |
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1160 navigation button group. In other words, navigation left, right and center keys |
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1161 don't exist on the 18-button version. |
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1162 |
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1163 TI's demo/prototype/PoC UI code was originally developed on C-Sample or perhaps |
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1164 even earlier, thus it was originally designed for the 18-button keypad |
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1165 arrangement. For this reason, the code currently makes very little use of |
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1166 navigation left, right and center keys. However, some limited use is already |
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1167 being made of these extra keys (primarily on text and number entry screens, aka |
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1168 the editor), and our use of all available keys in the UI will keep growing. As |
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1169 a matter of project scope, we are NOT supporting backward compatibility with |
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1170 18-button keypads, given that the lowest-end Mot C1xx family already has |
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1171 21-button keypads. |
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1172 |
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1173 2.3. Audio routing |
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1174 |
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1175 TI's demo/prototype/PoC UI code from TCS211 does not use the audio mode facility |
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1176 of the RiViera Audio Service: ABB configuration remains the default set in L1 |
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1177 initialization, volume control is done by calling audio_SetAmplf() in the Condat |
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1178 abstraction layer, which in turn calls ABB_DlVolume(). This design will need to |
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1179 change in FreeCalypso: we will start using the RiViera Audio Service audio mode |
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1180 facility, and the use of this facility (including correct audio mode |
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1181 configuration files under /aud in FFS) will become mandatory on all targets. |
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1182 |
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1183 The following 3 audio modes are defined for call audio routing and idle |
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1184 operation (keyclicks etc), as opposed to Melody E1 ringing covered in section |
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1185 2.4.2: |
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1186 |
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1187 Mode name Used for |
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1188 ------------------------ |
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1189 handheld Default handheld operation and idle state |
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1190 handfree Calls in hands-free loudspeaker mode |
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1191 headset When a wired analog headset is plugged in |
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1192 |
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1193 At the minimum, valid /aud/handheld.{cfg,vol} files will need to be created in |
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1194 FFS on every supported target; other modes can be omitted if they can't be |
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1195 entered. /aud/*.vol files maintained by RiViera Audio Service will serve as the |
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1196 non-volatile volume setting store for each mode. |
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1197 |
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1198 2.3.1. Loudspeaker inclusion or omission |
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1199 |
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1200 The Mother's plan is to conditionalize loudspeaker support on the firmware build |
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1201 configuration. Once we implement initial support for audio modes using RiViera |
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1202 Audio Service, our basic bigcolor-{gprs,vo} and smallbw configurations will |
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1203 support only handheld and headset modes, but not handfree. We will then later |
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1204 add new bigcolor-spk-* configurations whose purpose will be to support |
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1205 loudspeaker-equipped phone handset targets; these configurations will enable |
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1206 support for the hands-free loudspeaker mode (and will expect the loudspeaker |
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1207 and handfree audio mode to be available), and will also switch the ringtone |
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1208 generation mechanism from the buzzer to Melody E1 - see section 2.4. |
56
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1209 |
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1210 2.3.2. Headset inclusion or omission |
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1211 |
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1212 The code supporting wired headset mode will always be included in the firmware, |
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1213 however, there will be a hardware driver function call to inquire if a headset |
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1214 is inserted or not. If the wired headset jack does not exist on a given target, |
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1215 or more practically if it exists but we don't support it, this headset status |
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1216 function will always return "no headset" indication, and the headset mode will |
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1217 never be entered. |
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1218 |
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1219 2.4. Ringtone generation |
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1220 |
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1221 See section 1.8 for an overview of possible ways in which ringtone generation |
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1222 may be accomplished. The only ring sound generation method supported by TI's |
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1223 TCS211 version of their demo/prototype/PoC phone UI (the version for Calypso, |
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1224 as opposed to other chipsets) is the original Calypso buzzer, i.e., Calypso |
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1225 digital waveform output intended for switching a magnetic buzzer. The code that |
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1226 rings this buzzer will execute successfully on every Calypso target, regardless |
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1227 of whether it actually has a magnetic buzzer or not: if there is no buzzer and |
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1228 Calypso BU/PWT output is left unconnected, like it is on our Luna platform, the |
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1229 code will still run and emit the intended tone waveform on BU, but this output |
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1230 will go nowhere and no audible sound will be made. |
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1231 |
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1232 As a matter of project scope, in our FreeCalypso handset firmware we shall |
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1233 support two configurations with regard to ringing: |
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1234 |
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1235 1) TI's original buzzer configuration will be retained for lorekeeping and to |
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1236 keep the door open for the possibility of a minimally usable FreeCalypso Lite |
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1237 aftermarket firmware for Motorola C139. |
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1238 |
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1239 2) For our own FC Libre Dumbphone handset, we will need to implement ringing by |
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1240 way of the same loudspeaker that will be used for hands-free calls, using the |
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1241 Melody E1 feature of Calypso DSP for ringtone melody generation. |
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1242 |
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1243 2.4.1. Scope limitation on buzzer melodies |
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1244 |
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1245 Because the option of ringing via Calypso buzzer output is retained only for |
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1246 lorekeeping and for minimal-support alien targets, no effort will be expended |
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1247 toward playing more musical melodies via the buzzer. Our current code (bugfixed |
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1248 from TI's original) implements just one buzzer ringing sound, consisting of |
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1249 alternating 800 Hz and 900 Hz tones, using BU mode rather than PWT, and the |
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1250 Mother currently has no plans to implement anything more for the buzzer |
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1251 configuration. |
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1252 |
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1253 2.4.2. Melody E1 ringer |
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1254 |
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1255 Our Melody E1 ringer implementation will require melody files in FFS, and we |
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1256 will also have a separate audio mode (in the RiViera Audio Service sense) that |
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1257 will be loaded during ringing. Even though the same physical loudspeaker will |
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1258 be used for both hands-free calls and ringing, logically the two are separate |
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1259 modes, and they will be treated as separate for the Audio Service. Separate |
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1260 logical modes will provide separate volume files, which is the correct approach: |
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1261 loudspeaker volume and ringing volume should be separate, just like how ringing |
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1262 volume is entirely separate when a buzzer is used. |
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1263 |
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1264 2.5. Vibrating alert |
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1265 |
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1266 Our FC handset firmware will support both ringing and vibrating alert modes (as |
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1267 well as a ring+vibrate mode) on all targets. The vibrator will be modeled as a |
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1268 simple on/off control (no "analog" control of different vibration intensity |
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1269 levels, at least initially), and the vibrating alert code path will ultimately |
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1270 boil down to a driver function call for vibrator on/off. Therefore, if the |
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1271 vibrator does not exist on a given target, or if it exists but we don't know how |
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1272 to operate it, the on/off control function can be empty on that target, and the |
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1273 firmware will "vibrate" virtually. |
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1274 |
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1275 On development boards such as FC Venus, the vibrator on/off function can turn a |
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|
1276 LED on and off to provide an indication of the UI layers making a vibrating |
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|
1277 alert. |
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1278 |
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1279 3. Venus development board |
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1280 |
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1281 As of the summer of 2021, FreeCalypso handset development has reached a point |
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1282 where a new development board is desired, to take the place of our current Luna |
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1283 development platform. The newly planned FreeCalypso development board is |
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58
diff
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|
1284 codenamed Venus, and it is envisioned as serving two goals: |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1285 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1286 1) Many of the hardware features intended for the ultimate FC handset product |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1287 as described in Chapter 1 can be prototyped on this Venus board; |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1288 |
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FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1289 2) The board will serve as the ideal firmware development platform, covering all |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1290 features and options that are listed in the previous chapter and defined as |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1291 being in scope for FC handset firmware. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1292 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1293 The following sections spell out the design specification for this Venus |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
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|
1294 development board. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1295 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1296 3.1. Build principle |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1297 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1298 The board will be built in the "hard" way, with the Calypso+Iota+RF chipset |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1299 implemented directly on the Venus board itself, as opposed to using a Tango |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1300 (iWOW TR-800) module. This approach is necessary because we need some Calypso |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1301 and Iota signals that are not brought out on TR-800: |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1302 |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1303 1) We need Iota HSMICBIAS, HSMICP and HSO signals (the 3rd audio channel) in |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1304 addition to the primary and secondary audio channels, in order to prototype |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1305 section 1.7 hardware for the real handset, and in order to provide a proper |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1306 firmware development platform for section 2.3. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1307 |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1308 2) We need Calypso BU/PWT output so we can implement an old-fashioned buzzer, |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1309 which we need in order to develop and maintain firmware per section 2.4, |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1310 supporting both buzzer and Melody E1 ringing. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1311 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1312 Once we have accepted that we have to bite the bullet and build our Venus board |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1313 in the "hard" way, we can also implement some other nice-to-have functions that |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1314 would have been deemed non-essential otherwise: |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1315 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1316 * We can bring out Calypso JTAG (which is not brought out on TR-800) like we did |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1317 on FCDEV3B. In the Mother's experience there is very little actual need for |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1318 Calypso JTAG, but it would be improper to omit this interface on a development |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1319 board when bringing it out is possible. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1320 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1321 * With access to the internal ON_nOFF signal, we can implement a reliable |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1322 chipset-ON LED indicator, also like we did on FCDEV3B. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1323 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1324 * We can implement both LPG and PWL LEDs like on the original D-Sample. Neither |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1325 LED is strictly needed for the handset firmware functional scope or for |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1326 prototyping toward the final handset; at least one LED is desired for the |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1327 purpose of indicating virtual vibrator on/off state, but similarly to other |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1328 considerations, it would be improper to pass up the opportunity to implement |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1329 both LEDs. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1330 |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1331 * Mostly unrelated to the handset project, falling instead into the realm of |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1332 general Calypso chipset knowledge recovery, I have wanted for a long time to |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1333 sniff the internal chip-to-chip VSP interface between Calypso and Iota - but |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1334 such feat cannot be accomplished on any currently existing hardware, as it's |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1335 an internal interface going from one BGA to another on PCB inner layers. If |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1336 we are building a new Calypso development board for other purposes, it would |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1337 be nifty to throw in a VSP tap header as well. |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1338 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1339 3.2. Purpose and scope |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1340 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1341 Aside from the logically unrelated VSP tap feature, our Venus board will be |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1342 intended for handset firmware development and handset hardware prototyping only. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1343 It is not intended for non-handset directions of interest - for other interests |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1344 and purposes, use Caramel2 or FCDEV3B. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1345 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1346 Calypso MCSI will not be available on FC Venus - in handset applications MCSI |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1347 pins are switched into GPIO mode, and we'll be using these GPIOs for LCD |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1348 backlight control on both Venus and the final handset. (Our current Luna |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1349 platform is likewise.) If you need MCSI, then you are doing modem work, not |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1350 handset, so use Caramel2 or FCDEV3B. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1351 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1352 3.3. RF bands and PCB layout |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1353 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1354 The Mother's intent for the Venus board is to stop copying Openmoko's triband |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1355 PCB layout and instead switch to TI's original Leonardo+ quadband layout, which |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1356 has been recovered from iWOW TR-800 via professional PCB reverse engineering. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1357 We will need quadband RF for the final FC Libre Dumbphone handset, thus it would |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1358 be best to switch to it now, starting with Venus. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1359 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1360 3.4. Power supply arrangement |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1361 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1362 FC Venus will have the same orange Weidmuller power input connector as previous |
3ead88660a4e
FC-handset-spec: started Venus board description
Mychaela Falconia <falcon@freecalypso.org>
parents:
58
diff
changeset
|
1363 TI and FreeCalypso development boards C-Sample, D-Sample, Leonardo, FCDEV3B and |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1364 Caramel2. Ready-made VBAT needs to be provided via this connector, fed directly |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1365 to the core chipset and to VBAT-powered peripherals, no on-board power |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1366 conversion. During development, operation with an AC-mains-powered fixed 3.6 V |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1367 DC supply is generally much more convenient than a real battery. |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1368 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1369 For development and testing of handset battery management in the firmware, and |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1370 for exercising the charging boot path in particular, Iota VCHG needs to be |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1371 brought out like it is on iWOW DSK and FC Caramel2 boards, to be connected with |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1372 a jumper wire to +5V pin on the DUART28 USB adapter whenever a "charger plugged" |
69
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parents:
68
diff
changeset
|
1373 condition needs to be presented to the chipset. FC Venus will feature a 2x3 pin |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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68
diff
changeset
|
1374 header with Iota BCI signals as follows: |
c6dafe9f3ac2
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68
diff
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|
1375 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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diff
changeset
|
1376 VBATS VCCS |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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68
diff
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|
1377 PCHG VCHG |
c6dafe9f3ac2
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diff
changeset
|
1378 ICTL GND |
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parents:
68
diff
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|
1379 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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parents:
68
diff
changeset
|
1380 Please note that this planned BCI header pinout differs from iWOW DSK and FC |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
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68
diff
changeset
|
1381 Caramel2, which implement the following 2x4 pinout instead: |
59
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parents:
58
diff
changeset
|
1382 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1383 ICTL VCCS |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1384 PCHG VCHG |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1385 ADIN2 ADIN1 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1386 GND GND |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1387 |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1388 The Mother's approach to development and testing of higher-level UI functions |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1389 dealing with battery management is to use the BSIM feature of our FCHG driver, |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1390 in which case the board remains powered from a fixed DC supply (no actual |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1391 battery) and only VCHG needs to be connected. However, if a need arises to |
3ead88660a4e
FC-handset-spec: started Venus board description
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parents:
58
diff
changeset
|
1392 connect an actual battery and an actual Iota-controlled charging circuit, it |
3ead88660a4e
FC-handset-spec: started Venus board description
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58
diff
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|
1393 will be possible: the battery will need to be connected to the orange power |
3ead88660a4e
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58
diff
changeset
|
1394 input connector, and the control signals for the charging circuit will need to |
69
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parents:
68
diff
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|
1395 be connected to the 2x3 header. |
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FC-handset-spec: BCI header change on Venus
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68
diff
changeset
|
1396 |
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parents:
68
diff
changeset
|
1397 The Mother's vision is that if and when we do need to exercise an actual Li-ion |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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parents:
68
diff
changeset
|
1398 battery with an actual Iota-controlled charging circuit, we will need to build |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1399 a separate battery+charger board that will connect to the power input and BCI |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1400 control interfaces on the Venus board. That battery+charger board will feature |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1401 an 18650 battery holder and a +5V charging power source connection, the charging |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1402 current path (aside from BCI controls) will be contained entirely in that add-on |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1403 board, whereas the battery power interface between Venus and the add-on board |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1404 will carry only the load or discharge current. |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1405 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1406 The reasons for changing the BCI header pinout from iWOW DSK and FC Caramel2 to |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1407 a different one for FC Venus are as follows: |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1408 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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parents:
68
diff
changeset
|
1409 * FC Tango (iWOW TR-800) module that forms the core of FC Caramel2 does not |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1410 bring out Iota VBATS as a separate signal - instead it is connected to the |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1411 VBAT supply inside the module. However, if the charging current measurement |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1412 resistor will reside on a separate battery+charger board, then it would be |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1413 most proper to connect both VBATS and VCCS to the two sides of this resistor, |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1414 providing more accurate charging current measurement and CI control loop |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1415 operation. Thus VBATS needs to be added to the BCI header. |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1416 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
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parents:
68
diff
changeset
|
1417 * ADIN1 and ADIN2 won't be needed when using a common off-the-shelf 18650 |
c6dafe9f3ac2
FC-handset-spec: BCI header change on Venus
Mychaela Falconia <falcon@freecalypso.org>
parents:
68
diff
changeset
|
1418 battery for prototyping - see section 1.10.1 for background information. |
60
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
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parents:
59
diff
changeset
|
1419 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1420 3.5. LCD module and backlight |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1421 |
67
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FC-handset-spec: LCD and backlight specification changes
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parents:
66
diff
changeset
|
1422 The Mother's original intent was to finalize the selection of LCD module for the |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1423 actual handset before embarking on the detailed design (as in schematics, BOM |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1424 and layout) of FC Venus, and to implement the final LCD and the final backlight |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1425 circuit on the Venus board. However, because of the delay in KWH020ST23-F01 LCD |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1426 testing caused by Digi-Key part backorder issues (see section 1.4.2), this plan |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1427 is being modified slightly: the design of FC Venus board is being ungated on the |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1428 bet that KWH020ST23-F01 LCD module will pass all necessary qualification tests, |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1429 but this Venus board design won't be sent out to PCB fab until those LCD tests |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1430 actually pass. |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1431 |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
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parents:
66
diff
changeset
|
1432 The backlight circuit design of section 1.4.4.1, which is hoped to be final, is |
ed686a290f2d
FC-handset-spec: LCD and backlight specification changes
Mychaela Falconia <falcon@freecalypso.org>
parents:
66
diff
changeset
|
1433 being included in the Venus board design. |
60
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1434 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1435 3.6. Keypad buttons |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1436 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1437 The complex mechanical arrangement of keypad buttons that will be needed for the |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1438 real handset will NOT be done on the Venus board. Instead there will be a |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1439 simple 5x5 matrix of buttons in rows and columns, with silk screen labels |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1440 indicating the function of each button, matching D-Sample - the same arrangement |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1441 as on our current Luna platform. There will also be 3 out-of-matrix buttons for |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1442 PWON, RPWON and RESET. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1443 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1444 There will be no keypad backlight on the Venus board. This secondary backlight |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1445 is not needed for firmware development, as it is not managed separately in our |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1446 fw architecture - instead its control will be absorbed into our R2D BLRR control |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1447 mechanism on the final handset where this backlight will be added. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1448 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1449 3.7. Audio interfaces |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1450 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1451 Corresponding to the 3 audio channels of section 1.7, there will be 3 analog |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1452 audio interfaces on FC Venus: two TRRS jacks and one 2-pin header. These audio |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1453 interfaces will be as follows: |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1454 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1455 * The main audio channel (the one that will go to the built-in earpiece speaker |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1456 and mic in the real handset) will be wired to a TRRS jack exactly like on |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1457 Caramel2. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1458 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1459 * The "official" headset channel (the one that will be a jack in the final |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1460 handset) will be wired to another identical TRRS jack. This other jack will |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1461 need plug insertion detection, signaled to a Calypso GPIO input. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1462 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1463 * The output of the loudspeaker amplifier (see section 1,7.2) will be wired to |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1464 a 2-pin header exactly like on FCDEV3B, allowing the same 8 ohm lab bench |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1465 loudspeaker to be connected. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1466 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1467 3.8. Magnetic buzzer |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1468 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1469 There will be a magnetic buzzer implemented directly on the Venus board itself |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1470 (not an externally attached component), exactly like on TI's D-Sample board. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1471 This buzzer will be controlled by Calypso BU/PWT output in the canonical manner, |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1472 allowing the expected sounds to actually emanate when firmware operates the |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1473 old-fashioned Calypso buzzer output. See section 2.4 for the purpose of this |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1474 hardware provision. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1475 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1476 3.9. LEDs instead of vibrator |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1477 |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1478 There will be no vibrator on FC Venus - it is a mechanical function which cannot |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1479 be sensibly implemented on a development board meant for use on a lab bench. |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1480 Instead our Venus board will feature both LPG and PWL LEDs (i.e., LEDs |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1481 controlled by the respective Calypso outputs) exactly like D-Sample, and either |
f0d9a2cf15d2
FC-handset-spec: Venus peripherals documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
59
diff
changeset
|
1482 of these LEDs can be used to simulate vibrator on/off state. |
61
da5113856f3b
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parents:
60
diff
changeset
|
1483 |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1484 3.10. Host computer interface |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1485 |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1486 The host interface model on FC Venus will need to follow that of section 1.12. |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1487 More specifically, our Venus board will implement the mobile side of the "wall" |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1488 between USB and mobile power domains, complete with all provisions of section |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1489 1.12.2 for the mobile side, whereas the USB domain is already implemented on our |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1490 DUART28 adapter board. The two domains will be interconnected with a ribbon |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1491 cable in the FC Venus lab bench setup. The 10-pin DUART header will have our |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1492 standardized FreeCalypso DUART pinout. |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1493 |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1494 Also following the principal design of section 1.12.3, there will be a 3-pin |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1495 header on the Venus board bringing out RPWON, nTESTRESET and GND, to be |
da5113856f3b
FC-handset-spec: Venus DUART & CTL interfaces documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
60
diff
changeset
|
1496 connected to the boot control header on DUART28C. |
62
42d53bfbcca3
FC-handset-spec: Mot C139 idea documented
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1497 |
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1498 4. Motorola C139 port |
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1499 |
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1500 4.1. Background information |
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1501 |
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1502 In FreeCalypso we have low-level support for the following alien targets: |
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1503 |
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1504 * Motorola C11x/12x |
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1505 * Motorola C139/140 |
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1506 * Motorola C155/156 |
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1507 * Pirelli DP-L10 |
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1508 * Sony Ericsson J100 |
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1509 |
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1510 Low-level support means that for all of these targets, we are able to build and |
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1511 load a FreeCalypso firmware image that boots and runs without crashing, operates |
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1512 the phone's GSM radio hardware in proper spec-compliant manner (transmissions |
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1513 verified with a CMU200 RF tester), and allows control via AT commands and |
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1514 FreeCalypso debug & development tools fc-shell, fc-tmsh and fc-fsio. However, |
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1515 in this so-called "voice pseudo-modem" (VPM) operation, the phone's LCD stays |
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1516 dark, the buttons do nothing, and there are no high-level functions of any kind, |
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1517 only low-level control from the attached host computer. |
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1518 |
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1519 It also just happens that in year 2015 I (Mother Mychaela) produced a firmware |
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1520 version for Mot C139 that runs untethered, without host computer connection. |
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1521 However, that untethered FC-on-C139 firmware was produced as a poor man's hack, |
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1522 not as an end user offering! Here is the situation we were in: we did not |
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1523 discover the existence of iWOW TR-800 (an extremely obscure Calypso module) |
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1524 until December of 2019, thus for the 4 years between 2015 and 2019 we had no way |
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1525 of running TI's TCS211 MFW+BMI (handset configuration) firmware in its proper |
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1526 D-Sample config, which is 176x220 pixel color. But we knew that TI also had an |
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1527 older C-Sample UI configuration (84x48 pixel B&W), thus out of poverty, for the |
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1528 lack of proper development hardware, we resurrected that old C-Sample UI config |
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1529 (at first it wouldn't even compile) and got it running on Mot C139 hardware - |
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1530 possible because that 84x48 pixel UI was small enough to fit into Motorola's |
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1531 96x64 pixel LCD. |
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1532 |
63
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1533 To be clear, I *never* considered this hacky FC-on-C139 port to be an acceptable |
62
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1534 substitute or replacement for my real goals of first getting TI's TCS211 UI up |
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1535 and running in its proper 176x220 pixel color configuration, and then producing |
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1536 a FreeCalypso handset that can replace the proprietary Pirelli DP-L10. However, |
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1537 a peculiar situation has arisen: we now know that it is possible to transform |
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1538 Motorola C139 into a sort of Libre Dumbphone Lite with aftermarket FreeCalypso |
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1539 firmware, and it is clear that some users will prefer this "liberated C139" |
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1540 option over the Mother's desired FC Libre Dumbphone handset - probably for |
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1541 reasons of cost more than anything, as our FC phone will likely end up costing |
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1542 thousands of dollars. The rest of this chapter will explore the possibility of |
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1543 practically usable FreeCalypso handset firmware on Mot C139 hardware. |
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1544 |
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1545 4.2. Why C139? |
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1546 |
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1547 As a matter of general principle, we could probably get our FreeCalypso Lite |
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1548 firmware running on all or most of the 5 alien targets listed in section 4.1. |
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1549 However, the level of usability and the set of user-available features on the |
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1550 other 4 would only be worse than what we would get on C139, thus if someone is |
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1551 looking for a pre-existing phone hw unit to convert to FreeCalypso Lite, then |
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1552 C139 is the best choice in terms of outcome quality. |
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1553 |
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1554 It is particularly worthy of note that if we were to get FreeCalypso Lite |
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1555 firmware running on Pirelli DP-L10 (it hasn't been tried as of this writing, |
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1556 but it is likely possible), the result would be not only much much worse in |
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1557 functionality than Pirelli's official firmware or the Mother's desired full FC |
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1558 handset, but actually even worse than the same FreeCalypso Lite firmware running |
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1559 on Motorola C139! Therefore, even though the Pirelli phone serves as the |
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1560 Mother's inspiration for our own FC handset hardware, the existing Pirelli |
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1561 hardware is mostly useless for the purpose of turning it into a libre phone - |
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1562 all because of the vast amount of completely undocumented hardware in this |
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|
1563 model. |
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|
1564 |
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|
1565 4.3. How to make it happen |
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|
1566 |
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|
1567 The main reason why a practically usable FC firmware version for Mot C139 has |
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1568 not been produced yet is because I, Mother Mychaela, am not willing to do it in |
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1569 such a way that would jeopardize my primary goal of true FC handset hardware. |
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1570 I am willing to support FreeCalypso Lite on C139 as a *side addition* to the |
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1571 main FC handset hardware goal, but never as a replacement. |
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|
1572 |
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|
1573 Right now my next project goal is to build my desired Venus development board. |
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1574 Once that board is built, we will be in a better position to whip our TI-based |
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1575 FC handset firmware into shape. No, my priorities won't change, and my initial |
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1576 work on the Venus platform will be on the bigcolor firmware configuration. |
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1577 However, once FC Tourmaline bigcolor firmware runs on FC Venus in a satisfactory |
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1578 manner, with audio mode conversion implemented but still using the Calypso |
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1579 buzzer for ringing, then it may be a good time to bring the smallbw |
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1580 configuration up to par. And once FC Tourmaline smallbw runs in an end-user- |
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1581 acceptable manner on FC Venus, then it will be a slam dunk to move it to actual |
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1582 C139 hardware. |
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|
1583 |
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|
1584 4.4. Functional scope limitations |
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1585 |
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1586 Because FC Lite on Mot C139 can only ever be a side project and can never be my |
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1587 main goal, I have to put some strict limits on the amount of work I am going to |
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1588 do in that direction: |
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|
1589 |
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1590 * The color capability of C139 physical LCD will not be used by FC Lite |
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1591 firmware, instead the screen of FC-on-C139 will always be black&white. The |
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1592 reason for this limitation is that displaying color on C139 would involve |
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1593 actual work (a non-trivial amount of it) to create an entirely new "small |
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1594 color" UI configuration (as opposed to the existing bigcolor and smallbw), |
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1595 whereas the existing smallbw config is a freebie gift from TI. |
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|
1596 |
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|
1597 * No musical ringtones, just one extremely basic ringing sound - implementing |
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1598 musical ringtones for the buzzer would be C139-specific work which is not |
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1599 needed for the main goal of FC Libre Dumbphone, which will use Melody E1 |
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|
1600 ringing instead. |
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|
1601 |
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|
1602 * No support for actual headsets in the headset jack! The headset jack on all |
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1603 Mot C1xx phones serves a dual function, it is both an analog headset interface |
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FC-handset-spec: Mot C139 idea documented
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1604 and a digital interface for computer connection (UART at 2.8V logic levels), |
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FC-handset-spec: Mot C139 idea documented
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1605 and in FreeCalypso we absolutely require the computer interface function of |
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FC-handset-spec: Mot C139 idea documented
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1606 this jack - it is essential for development and debugging. Therefore, the |
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FC-handset-spec: Mot C139 idea documented
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1607 "ordinary end user" function of the headset jack is lost. |
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FC-handset-spec: Mot C139 idea documented
Mychaela Falconia <falcon@freecalypso.org>
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1608 |
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FC-handset-spec: Mot C139 idea documented
Mychaela Falconia <falcon@freecalypso.org>
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1609 In summary, FreeCalypso Lite on Motorola C139 will be an *extremely* basic and |
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FC-handset-spec: Mot C139 idea documented
Mychaela Falconia <falcon@freecalypso.org>
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1610 "bare bones" phone - but the hope is that it would still be useful to some. |