FreeCalypso > hg > fc-magnetite

annotate doc/Tango-pinmux @ 701:35e7f9d0379f

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targets: add TARGET_HAS_BUZZER to c11x, c139 and dsample This new target config preprocessor symbol was introduced in Tourmaline in connection with the new approach to playing buzzer melodies via PWT, properly omitting the responsible code on targets where BU output controls the vibrator instead. That code is not present in Magnetite and we have no plans to backport it here, but target header files should be kept consistent between the two trees, especially given that we plan to support FC Venus target in Magnetite.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 26 Mar 2022 19:51:34 +0000
parents 52ee171ff5e4
children
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52ee171ff5e4 doc/Tango-pinmux: definitions laid down
Mychaela Falconia <falcon@freecalypso.org>
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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
52ee171ff5e4 doc/Tango-pinmux: definitions laid down
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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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Mychaela Falconia <falcon@freecalypso.org>
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17 some of them can also be configured as dedicated Calypso peripheral pins,
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Mychaela Falconia <falcon@freecalypso.org>
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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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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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123 Other GPIO pins
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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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127 are not brought out externally on Tango modules, thus they don't need to be
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128 considered. Our fw configures them as dummy outputs to prevent floating inputs.