FreeCalypso > hg > fc-magnetite
annotate doc/Tango-pinmux @ 691:b7b809c62586
doc/Config-vars: updated descriptions of DSAMPLE_FULL_COLOR and UI_CONFIG
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 15 Oct 2020 17:42:12 +0000 |
parents | 52ee171ff5e4 |
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1 FreeCalypso Tango is a Calypso core module with the special quality of having |
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2 many Calypso signals brought out on the user interface connector. Out of the |
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3 great many Calypso signals that are brought out, the following 8 pins are |
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4 subject to functional multiplexing concerns: |
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5 |
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6 GPIO1 |
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7 GPIO2 |
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8 GPIO3 |
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9 RESET_OUT/GPIO7 |
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10 MCSI_TXD/GPIO9 |
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11 MCSI_RXD/GPIO10 |
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12 MCSI_CLK/GPIO11 |
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13 MCSI_FSYNCH/GPIO12 |
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14 |
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15 All 8 are capable of functioning as GPIOs, meaning that a Tango-based custom |
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16 application board designer can use them for whatever purpose they like, but |
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17 some of them can also be configured as dedicated Calypso peripheral pins, |
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18 particularly MCSI. Others (GPIO1-3) have software-defined conventional |
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19 functions based on long-standing tradition. |
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20 |
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21 The special complication that arises for our firmware with regard to these GPIO |
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22 and multifunction pins is that it is not our place as the firmware vendor to |
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23 dictate to our potential customers how they should wire these pins on their |
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24 boards. Instead an FC Tango customer should be able to wire up their board as |
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25 their application calls for, subject to constraints imposed by hardware (not by |
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26 firmware!), and our standard fw needs to work with every reasonable possibility |
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27 for user wiring of our GPIO and multifunction pins. The following practical |
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28 cases need to be addressed: |
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29 |
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30 * If a customer chooses to use any of our GPIOs as an input, feeding some |
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31 external output to it, there needs to be a way to tell our fw to leave that GPIO |
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32 as an input and not switch it to an output. |
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33 |
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34 * Conversely, if a given GPIO or multifunction pin is unused or not needed in a |
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35 given application, the app board designer should have the freedom to either tie |
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36 it off or leave it unconnected. If some of our GPIO or multifunction pins are |
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37 left unconnected, this fact needs to be communicated to our fw so it can |
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38 configure them as dummy outputs, preventing floating inputs. |
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39 |
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40 * Some applications will use MCSI, while others won't. If a given application |
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41 does not use MCSI, the 4 pins (or any subset of them) can be used as GPIOs, |
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42 either inputs or outputs, or the unused pins may be left unconnected. |
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43 |
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44 * GPIO3 is traditionally defined (by conventions going back to TI) as DTR input |
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45 - but not every application will have a sensible DTR signal to feed to this pin. |
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46 If there is no DTR signal in a given application, the app board designer should |
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47 be able to either use GPIO3 for some unrelated purpose, or leave it unconnected. |
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48 |
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49 * GPIO2 is similarly defined as DCD output by the same traditional conventions. |
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50 Because it is an output from Calypso, it can be simply ignored and left |
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51 unconnected if it is not needed - but a user should also be able to use the GPIO |
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52 for unrelated purposes. |
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53 |
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54 * There exist several historical conventional functions for GPIO1 output: |
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55 loudspeaker control (D-Sample, Leonardo, FCDEV3B), Openmoko's application |
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56 processor wake-up signal, or RI modem control output. We allow any of these |
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57 options, plus other arbitrary uses. |
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58 |
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59 FreeCalypso solution |
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60 ==================== |
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61 |
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62 Our solution for firmware build target tangomdm (standard shipping fw for Tango |
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63 modems) is that our fw will look on boot for a file in FFS named |
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64 /etc/tango-pinmux; it will be a binary file of 4 bytes, defining pin |
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65 multiplexing configuration as follows: |
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66 |
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67 Byte 0: GPIO1 config |
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68 |
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69 The following values are defined: |
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70 |
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71 0x00: GPIO1 is left as an input from power-up |
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72 0x80: GPIO1 is switched to an output, initial value 0 |
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73 0x81: GPIO1 is switched to an output, initial value 1 |
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74 0x82: GPIO1 is wake-up output per Openmoko GTA01/02 convention |
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75 0x83: GPIO1 is RI output |
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76 |
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77 Byte 1: GPIO2 and GPIO3 config |
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78 |
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79 Bit 7: if 1, GPIO3 is DTR input, other bits in this nibble ignored |
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80 if 0, GPIO3 is a "generic" GPIO (undefined function) per bits 5 and 4 |
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81 Bit 5: if 1, GPIO3 is an output, otherwise it's an input |
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82 Bit 4: initial output value if GPIO3 is an output |
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83 |
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84 Bit 3: if 1, GPIO2 is DCD output, other bits in this nibble ignored |
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85 if 0, GPIO2 is a "generic" GPIO (undefined function) per bits 1 and 0 |
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86 Bit 1: if 1, GPIO2 is an output, otherwise it's an input |
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87 Bit 0: initial output value if GPIO2 is a generic (not DCD) output |
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88 |
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89 Byte 2: Peripheral pin mux config |
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90 |
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91 Bit 7: if 0, MCSI pins retain their default power-up functions |
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92 if 1, MCSI pins are switched to being GPIOs |
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93 |
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94 Bit 3: if 0, RESET_OUT pin retains its default power-up function |
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95 if 1, RESET_OUT pin is switched to being GPIO7 |
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96 Bit 1: if 1, GPIO7 is an output, otherwise it's an input |
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97 bit 0: initial output value of GPIO7 |
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98 |
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99 Byte 3: I/O config of MCSI pins turned into GPIOs |
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100 |
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101 This byte will be considered only if Byte 2 Bit 7 is set to 1, and will be |
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102 ignored otherwise. |
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103 |
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104 Bit 7: GPIO12 direction: 1 means output, 0 means input |
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105 Bit 6: GPIO11 direction: 1 means output, 0 means input |
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106 Bit 5: GPIO10 direction: 1 means output, 0 means input |
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107 Bit 4: GPIO9 direction: 1 means output, 0 means input |
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108 |
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109 Bit 3: GPIO12 initial output value |
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110 Bit 2: GPIO11 initial output value |
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111 Bit 1: GPIO10 initial output value |
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112 Bit 0: GPIO9 initial output value |
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113 |
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114 If the /etc/tango-pinmux file is missing, the effect will be the same as if all |
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115 four bytes are equal to zero: GPIO1-3 will be functionally-undefined inputs, |
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116 RESET_OUT/GPIO7 will be left as RESET_OUT from power-up, and all 4 MCSI pins |
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117 will be likewise left in their power-up default MCSI function. |
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Mychaela Falconia <falcon@freecalypso.org>
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118 |
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119 Any GPIO that is configured as an input can be read with AT+IOR, and any GPIO |
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120 that is configured as a generic (not built-in function) output can be set with |
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121 AT+IOW. |
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122 |
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parents:
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123 Other GPIO pins |
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Mychaela Falconia <falcon@freecalypso.org>
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124 =============== |
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125 |
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126 Calypso pins GPIO0, TSPDI/GPIO4, BCLKX/GPIO6, MCUEN1/GPIO8 and MCUEN2/GPIO13 |
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Mychaela Falconia <falcon@freecalypso.org>
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127 are not brought out externally on Tango modules, thus they don't need to be |
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Mychaela Falconia <falcon@freecalypso.org>
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128 considered. Our fw configures them as dummy outputs to prevent floating inputs. |