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bmi3: fixed the mysterious "mute on first call" bug When UI-enabled fw boots on a previously blank (no /mmi/* files) FFS for the first time, the output_volume member of the persistent UI settings structure was left uninitialized, corresponding to the earpiece volume being set to mute, which is an invalid setting. Because of other quirks in the far-from-finished UI code, this volume setting takes effect only when the first call is answered, producing the odd behaviour seen at the user level. The current fix is to set the blank-FFS default for output_volume to volume level 4, which is the same -6 dB Iota volume as the ACI default.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 14 May 2020 02:50:41 +0000
parents 712c5cc0b2a9
children
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1 FreeCalypso end user libre phone goals
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2 ======================================
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3
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4 The Mother's primary goal in FreeCalypso is to create (design and build) our
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5 own FreeCalypso libre phone handset (a Libre Dumbphone) that can replace the
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6 proprietary Pirelli DP-L10, retaining the following essential qualities of the
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7 latter:
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8
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9 * a "dumbphone" in the most classic "candybar" form factor with traditional
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10 dial buttons, NOT a smartphone;
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11 * a color LCD of a decent size (Pirelli's is 128x128 pixels, ours will be
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12 176x220 pixels);
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13 * a loudspeaker that works for both hands-free calls and polyphonic ringtone
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14 melodies;
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15 * a USB port that combines charging with a built-in serial interface for
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16 computer interfacing.
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17
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18 A secondary goal is to put together a firmware version that can be flashed into
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19 a surplus Motorola C139 or C140 phone (obscenely cheap hardware) and turn those
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20 originally-proprietary phones into a sort of Libre Dumbphone Lite - functionally
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21 inferior to our own FreeCalypso Libre Dumbphone because Mot C139/140 hardware
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22 is significantly inferior to what I seek to build (no loudspeaker, no USB, much
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23 smaller LCD), but may be attractive to those cheap souls who are unwilling to
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24 pay for higher-quality hardware. (Doing a similar feat with Pirelli DP-L10
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25 hardware - turning it into a Libre Dumbphone by way of aftermarket firmware -
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26 is not practically feasible: the effort to reverse-eng Pirelli's undocumented
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27 hardware to the extent necessary for such a feat would cost at least as much
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28 time and money as designing and building our own Libre Dumbphone hardware,
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29 hence the latter is clearly preferable.)
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30
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31 The primary goal of entirely new FreeCalypso Libre Phone hardware and the
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32 secondary goal of FC on the C139 are not mutually exclusive: because we are a
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33 FLOSS project rather than proprietary sw, we do not artificially restrict what
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34 hardware our fw can run on and what functionality it can provide: while the
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35 primary target for our Libre Dumbphone firmware will always be our own hw,
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36 whatever functionality can work on the more limited Mot C139 hw will work there,
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37 subject to the limitations of the crippled hw platform.
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38
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39 However, in terms of timeline sequentiality, the critical point is that I,
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40 Mychaela Falconia, the Mother of FreeCalypso, am not willing to do any more
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41 work on the UI firmware (for any target) ahead of designing and building the
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42 first prototype of the just-outlined FC Libre Dumbphone hardware: when it comes
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43 to the work that *I* am doing, it has to be hardware first, then UI firmware.
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44
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45 But the FreeCalypso codebase is free for everyone, it is free software which
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46 anyone in the world is free to fork in whatever ways they like, hence for those
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47 who feel (contrary to my own personal stance) that aftermarket Libre Dumbphone
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48 firmware for pre-existing hw platforms like Mot C139 is more important than new
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49 FreeCalypso Libre Dumbphone hardware, the correct solution for those people is
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50 to get over their fear of programming, roll up their sleeves and do some
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51 firmware coding of their own.
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52
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53 What we got from TI in terms of firmware
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54 ========================================
219
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55
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56 Phone handset firmware, i.e., fw that makes a phone device work as an untethered
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57 phone and not just a serial-cable-controlled pseudo-modem, requires a few
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58 additional layers of functionality beyond AT-command-controlled modem fw:
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59
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60 * The hardware-specific LCD driver, called R2D in TI's TCS211 program;
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61 * The actual phone UI implementation, which the cellular industry calls by the
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62 sexist term "MMI" - TI's implementation consists of two components called BMI
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63 and MFW;
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64 * Battery management (monitoring and charging);
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65 * Fairly complex on/off logic to handle all possible combinations of turn-on,
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66 turn-off, charging while "on", charging while "off", charging completed or
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67 failed but charging power source not unplugged yet.
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68
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69 The bulk of the UI code resides in the BMI and MFW layers, which sit on top of
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70 ACI (Application Control Interface), which is the topmost layer of the
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71 underlying GSM modem firmware stack. We got two different versions of this
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72 MFW+BMI code from TI:
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73
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74 * The version under src/aci2, used together with the original TCS211 versions
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75 of G23M PS and ACI components in the legacy 2092 config, has a very unclear
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76 origin: it came from the internal SVN of an obscure company that made
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77 AT-command-controlled Calypso modems (*not* complete phones with Calypso UI),
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78 those people did not use this code themselves at all (their environment was
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79 not even set up to be able to compile it), and it is totally unclear how they
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80 came to have that code which they did not use. It *might* correspond to the
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81 rest of TCS211 fw which we got from the same source, or it might not.
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82
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83 * The version under src/ui3, used in our hybrid configs going forward, has a
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84 much clearer origin: we took it from TCS3.2_N5.24_M18_V1.11_M23BTH_PSL1_src
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85 reference firmware for TI's later LoCosto chipset, which was published free
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86 to the world by Peek Inc. as that company was closing shop.
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87
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88 We are now able to build UI-enabled firmware configs using both versions of TI's
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89 MFW+BMI code, and there are no significant differences in the quality of the
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90 phone UI implementation: in both cases it is only a proof of concept, and is
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91 absolutely not ready for driving a real end user phone: the UI code contains
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92 crashing and other killer bugs, the battery management driver officially
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93 endorsed by TI for TCS211 and later programs (LCC for "low cost" unregulated
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94 chargers) is not appropriate for phones that use simple charging circuits and
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95 regulated +5 VDC charging power sources (USB or Motorola's C1xx charging
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96 adapters), and TI's older PWR battery management driver (TI totally removed it
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97 from TCS211, but we pulled it from the older MV100 source fragments) is
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98 bitrotten and just generally broken.
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100 In FreeCalypso we have developed our own battery charging and discharge
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101 monitoring driver (FCHG) that works on Mot C1xx and Pirelli DP-L10 phones in
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102 the "voice pseudo-modem" configuration (see the Voice-pseudo-modem article),
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103 but we still have the problem of the UI, namely, the lack of one that is
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104 practically usable. Because TI were in the business of making and selling
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105 chipsets rather than complete phones, proper phone UI development was something
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106 they left to their customers, and they provided only a very rough proof of
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107 concept implementation.
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108
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109 What we have currently
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110 ======================
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111
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112 If you wish to play with our current work in progress based on TI's PoC UI code,
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113 you have 3 configurations (in the ./configure.sh sense) to choose from:
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115 2092 This is our first UI-enabled configuration; it got its name
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116 because it is a mostly unchanged replica of TI's pdt_2092
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117 configuration in the original TCS211 program. This config uses
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118 the original TCS211 versions of G23M PS (blobs), ACI (source)
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119 and MFW+BMI (source) components. Data services (FAX_AND_DATA
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120 and GPRS) are enabled and cannot be disabled because of G23M PS
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121 blobs.
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122
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123 hybrid-ui This config is the TCS2/TCS3 hybrid counterpart to the above,
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124 using the new full source versions of G23M PS, ACI and MFW+BMI
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125 from the TCS3.2/LoCosto source. FAX_AND_DATA and GPRS are
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126 still enabled.
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127
463
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128 hybrid-ui-vo Same as hybrid-ui, but with FAX_AND_DATA and GPRS disabled,
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129 resulting in a lighter build.
374
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130
463
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131 All 3 of the above configs can be usefully built for 3 hardware targets:
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132 dsample, fcdev3b and c139. The resulting firmware will work as follows:
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133
463
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134 * If you have a real TI-made D-Sample board with the attached test handset (the
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135 platform that TI's own software engineers used when working on this UI code,
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136 at least before LoCosto), TI's 176x220 pixel color UI will be displayed on
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137 the LCD in the handset part of the kit, just the way TI meant it. However,
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138 because we are missing a piece of code for Clara RF, GSM radio won't work,
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139 and the UI can only be exercised as it would work in the absence of coverage:
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140 one can step through the menus and read SIM phonebook entries and saved
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141 messages, but no calls. See the D-Sample article for the details.
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142
463
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143 * You can run a UI-enabled firmware build on our FCDEV3B modem board that has
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144 no physical LCD or keypad hardware, and display TI's 176x220 pixel color UI
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145 on a connected external host, sending simulated keypresses from the same -
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146 look in the freecalypso-ui-dev repository for the necessary tools.
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147
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148 * When a UI-enabled firmware config is built for the C139 target, the UI config
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149 (Bourne shell variable UI_CONFIG in our configuration and Makefile generation
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150 system) is switched from TI's D-Sample UI (176x220 pix color,
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151 UI_CONFIG=bigcolor) to their older C-Sample UI: 84x48 pix black & white,
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152 UI_CONFIG=84x48. This 84x48 pix B&W C-Sample UI is then displayed on the
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153 96x64 pixel physical LCD on the C139 phone.
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154
463
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155 If you are interested in the Mot C139 hardware target and you are interested in
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156 turning our current state of affairs into something that would allow you to use
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157 your C139 as a practically usable libre phone with FreeCalypso, the Mother
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158 strongly recommends that you use the hybrid-ui-vo configuration as your starting
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159 point; working on the old src/aci2 UI code that is slated for retirement because
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160 it is coupled to a G23M PS version that exists only as binary blobs would be a
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161 total waste. If you try to use our current hybrid-ui-vo firmware on the C139
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162 as a practical phone, the following problems will be the ones that hit you most
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163 immediately, and therefore would need to be fixed first:
219
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164
463
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165 * The FCHG driver included in the fw build does monitor the battery state of
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166 charge as it discharges, and you can query it with the standard AT+CBC command
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167 using the AT-over-RVTMUX channel on the headset jack serial port, but it is
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168 not connected to the UI, hence the battery icon on the screen shows no useful
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169 info. Thus with an end user hat on, you would have no way of knowing if your
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170 battery is full or almost empty and about to die any second or anywhere in
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171 between.
219
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172
463
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173 * The firmware similarly supports battery charging, but once again there is
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174 absolutely no indication in the UI as to the state of the charging process as
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175 in progress, completion or errors. Instead you can only observe this
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176 charging process by watching the debug trace output emitted on the headset
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177 jack serial port.
219
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178
463
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179 * Every standard commercial end user phone implements a special mode of
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180 operation that is activated if the user plugs in the charging power source
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181 while the phone is off: the phone firmware boots just enough to manage the
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182 battery charging process (the LCD shows nothing but this charging process),
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183 but does not boot all the way to "full on" operation (SIM bring-up and
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184 network search) until and unless some designated button is pressed to request
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185 such full boot. The proof-of-concept code we got from TI does not implement
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186 this special "charging boot" mode; instead if you connect the charging power
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187 source to a fully-off phone, the result will be a full boot just as if you
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188 pressed the red power-on button. This lack of the expected "charging boot"
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189 mode is bad, as one really needs a "charge while off" mode in order to
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190 properly recover from a fully discharged battery.
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191
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192 * Every standard commercial end user phone implements some timer logic for the
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193 power-on button, such that if the phone is fully off, the power button needs
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194 to be pressed not just momentarily, but held down for some time in order to
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195 make the phone turn on and boot. This logic provides necessary protection
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196 from accidental turn-ons: if you are in some place where your phone needs to
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197 be off and you have turned it off, you don't want it booting back up on its
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198 own because the button got pressed momentarily from the phone being in your
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199 pocket or purse. This logic is currently missing.
219
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200
463
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201 * The LCD on Mot C139 phones is already small, only 96x64 pixels, but with the
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202 current firmware using the UI which TI originally created for their C-Sample
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203 and earlier development boards, the usable area is reduced even further to
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204 only 84x48 pixels. Likewise the physical LCD is color, but the UI is only
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205 black&white because the UI code "thinks" it's running on a C-Sample board
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206 which only had a black&white LCD. Massively reworking the UI code to make
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207 use of the full 96x64 pixel LCD real estate, along with some colors, ought to
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208 be essential before this UI can really become fit for end user operation.
219
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209
463
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210 Some of these just-listed killer bugs are specific to the C139 target, while
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211 others will still be there when we have our own HSMBP with a 176x220 pix color
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212 LCD like on the D-Sample. Those bugs which are not C139-specific will be fixed
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213 in the process of making our own FreeCalypso Libre Dumbphone based on our own
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214 hardware, and by virtue of the common code the fixes will benefit the C139
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215 target as well. In the case of C139-specific bugs, i.e., those specific to the
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216 tiny screen size or to the weird (not TI-canonical) way in which the power
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217 button is wired on C1xx phones, it is not currently known whether or not I
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218 (Mychaela aka The Mother) will ever be willing to invest significant work into
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219 these C139-specific issues. Thus the message is loud and clear: those who
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220 desire FreeCalypso as aftermarket libre phone fw for Mot C139 or other non-FC
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221 hardware need to roll up their sleeves and start learning the code.