FreeCalypso > hg > fc-magnetite

annotate doc/SE-J100-target @ 680:ee3ac8c617cb

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armio.c: set GPIO2 output high initially On TI-canonical platforms GPIO2 is DCD modem control output. In TI's original code the AI_InitIOConfig() function called from Init_Target() would configure GPIO2 as an output and set the initial output value to low, but then the init code in uartfax.c called from Init_Serial_Flows() would immediately change it to high, corresponding to DCD not asserted. The result is a momentary asserted-state glitch on the DCD output. The present change eliminates this glitch, setting DCD output to not-asserted initially like it should be.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 25 Jun 2020 03:17:43 +0000
parents 7cecc3dadbe7
children
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595
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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1 Sony Ericsson J100 target support in FreeCalypso
7cecc3dadbe7 doc/SE-J100-target article written
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2 ================================================
7cecc3dadbe7 doc/SE-J100-target article written
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3
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4 SE J100 is the last Calypso device target of OsmocomBB origin to be added to
7cecc3dadbe7 doc/SE-J100-target article written
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5 FreeCalypso, joining the already-supported Mot C1xx and Pirelli DP-L10. This
7cecc3dadbe7 doc/SE-J100-target article written
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6 target is really not interesting at all on its own merit, instead it has been
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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7 added to FC Magnetite for testing purposes: to verify that we are able to drive
7cecc3dadbe7 doc/SE-J100-target article written
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8 this J100 variant of Compal's RFFE and produce correct RF Tx output as observed
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9 with our CMU200 instrument.
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10
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11 Despite being a Sony Ericsson rather than Motorola product (slightly different
7cecc3dadbe7 doc/SE-J100-target article written
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12 case design, totally different battery and accessory connectors), in core
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Mychaela Falconia <falcon@freecalypso.org>
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13 technical terms this SE J100 phone is still Compal, same as Mot C1xx. It is
7cecc3dadbe7 doc/SE-J100-target article written
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14 technically closest to Mot C139, with only a few differences:
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15
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16 * The display is different: same 96x64 pixel color, but a different model
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17 requiring a different driver;
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18
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19 * A ringtone player chip is used instead of the Calypso-driven buzzer;
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20
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21 * There are a few differences in GPIO setup, in TSPACT signal usage for RF Tx
7cecc3dadbe7 doc/SE-J100-target article written
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22 and in some RF Tx parameters (APC offset and Tx ramp templates) stemming from
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23 the use of a slightly newer RF PA, such that a firmware image built for Mot
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24 C139 or C11x should not be run on the J100, even if the LCD and the buzzer
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25 are don't-cares.
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26
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27 If you have one of these phones and wish to run FreeCalypso on it, follow the
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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28 procedure for Mot C139 in C1xx-Howto, with the following differences:
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29
7cecc3dadbe7 doc/SE-J100-target article written
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30 * You need to build a firmware image specifically for the j100 target
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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31 (./configure.sh j100 hybrid-vpm), don't flash a c139 or c11x build.
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32
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33 * Only the VPM configuration is available, not the proof-of-concept UI - the
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34 LCD driver for the latter configuration exists only for the Mot C139 LCD,
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35 not for SE J100 or any other C1xx.
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36
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37 * It is not certain at all whether the battery charging configuration we have
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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38 for Mot C1xx is correct or not for SE J100 - see further below.
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39
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40 Serial connection difficulty
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41 ============================
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42
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Mychaela Falconia <falcon@freecalypso.org>
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43 Connecting the serial interface (the obvious prerequisite before one can do any
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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44 kind of firmware hacking) is a lot more difficult on the SE J100 compared to
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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45 Mot C1xx. Following Sony Ericsson's product line, this J100 phone does not have
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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46 round-jack headset or charger connectors, instead all accessories (charger,
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Mychaela Falconia <falcon@freecalypso.org>
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47 headsets, Calypso UART access) are connected through a multi-pin connector (12
7cecc3dadbe7 doc/SE-J100-target article written
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48 pins to be exact) that was used by SE across their product line. While there
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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49 exist a number of "cottage industry" vendors who make ready-to-use serial cables
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50 for the kind of headset jack found in Mot C1xx phones, there does not appear to
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51 be anyone making comparable cables for SE J100, thus the only way to play with
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52 one of these phones is to construct the necessary serial cable yourself.
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53
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54 The pins on SE's proprietary accessory connector which carry Calypso UART RxD
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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55 and TxD on the J100 are the same pins which carry USB data lines on some other
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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56 SE phones which (unlike J100) have an official data services / computer
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Mychaela Falconia <falcon@freecalypso.org>
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57 connection function, thus there are two ways to hack together Calypso UART
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58 access on the J100:
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59
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60 Option 1: you can take a Sony Ericsson (or clone) USB-to-phone data cable and
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61 mutilate it: cut off the USB end, split out the little wires and solder them to
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62 your choice of 3.3 V USB-serial adapter. This is the route that was taken by
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63 this author (Mother Mychaela), and when I did it, I ran into a nasty little
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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64 problem: the wires inside the cut-apart SE-clone USB-to-phone cable are
7cecc3dadbe7 doc/SE-J100-target article written
Mychaela Falconia <falcon@freecalypso.org>
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65 extremely thin (can't be any thicker than 28 AWG, and seemed to be even thinner
7cecc3dadbe7 doc/SE-J100-target article written
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66 than that), and the solder contraption feels like it is barely holding, like it
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67 is going to fall apart at any moment.
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68
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69 Option 2: you can take the same SE (or clone) USB-to-phone data cable, but
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70 instead of mutilating it, connect it to another custom contraption: if you can
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Mychaela Falconia <falcon@freecalypso.org>
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71 find a USB female-A connector part to which you can solder your own wires (or
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Mychaela Falconia <falcon@freecalypso.org>
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72 cut apart some other cable that terminates in a USB female-A socket), make a
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Mychaela Falconia <falcon@freecalypso.org>
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73 cable contraption consisting of this USB female-A on one side (into which you
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Mychaela Falconia <falcon@freecalypso.org>
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74 insert the unmodified SE cable) and your choice of 3.3 V USB-serial adapter on
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Mychaela Falconia <falcon@freecalypso.org>
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75 the other end. I still have one more SE-clone data cable which I haven't cut,
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76 so I might try this approach.
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77
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78 For your choice of 3.3 V USB-serial adapter, you should definitely pick either
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Mychaela Falconia <falcon@freecalypso.org>
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79 FT232R or CP2102, so you can use GSM-specific high baud rates (GSM-specific
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Mychaela Falconia <falcon@freecalypso.org>
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80 because they derive from the 13 MHz clock) to transfer flash dumps and firmware
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81 images.
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82
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83 Battery charging problem
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84 ========================
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85
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86 Another problem stemming directly from SE's accessory connector arrangement is
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Mychaela Falconia <falcon@freecalypso.org>
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87 that it is very difficult to connect both a charging power source and Calypso
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Mychaela Falconia <falcon@freecalypso.org>
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88 UART access at the same time. At first I thought it was completely impossible
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89 (there is only one accessory connector on the bottom of the phone), but then by
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Mychaela Falconia <falcon@freecalypso.org>
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90 pure luck I acquired an unusual kind of SE charging adapter: this rare adapter
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Mychaela Falconia <falcon@freecalypso.org>
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91 has a pass-through mechanical design, such that one can plug this charging
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Mychaela Falconia <falcon@freecalypso.org>
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92 adapter into the phone and then piggy-back another accessory into it! However,
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Mychaela Falconia <falcon@freecalypso.org>
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93 this kind of SE charging adapter is super-rare, and I haven't played with mine
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Mychaela Falconia <falcon@freecalypso.org>
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94 yet because it has Europlug pins (not USA plug) on the AC power end, and I
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95 haven't got around yet to acquiring the requisite AC plug adapter.
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96
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97 Connecting both the charging power source and the Calypso UART at the same time
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98 is important for two reasons:
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99
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100 1) For me as the FreeCalypso developer, that is the only way I can develop and
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Mychaela Falconia <falcon@freecalypso.org>
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101 test the charging configuration for this phone model.
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102
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103 2) For "end users" of the voice pseudo-modem FreeCalypso fw configuration on
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Mychaela Falconia <falcon@freecalypso.org>
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104 this target, if you have no serial connection, you have no way of seeing how
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Mychaela Falconia <falcon@freecalypso.org>
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105 your charging progresses, as there is no LCD driver and the display stays dark
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106 and non-functional.
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107
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Mychaela Falconia <falcon@freecalypso.org>
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108 Because we don't have working battery charging on this SE J100 target yet, the
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Mychaela Falconia <falcon@freecalypso.org>
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109 only safe way to play with this target at the present moment is to have two of
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Mychaela Falconia <falcon@freecalypso.org>
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110 these phones (or another phone of a different model that takes the same
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Mychaela Falconia <falcon@freecalypso.org>
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111 batteries), and keep one phone fully intact with its original fw so it can be
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112 used to charge batteries when the FC-converted phone runs its battery down.