FreeCalypso > hg > fc-magnetite
annotate doc/SE-J100-target @ 648:337e6d3a4454
abb.c: disable superdeep sleep on Luna
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 07 May 2020 06:28:56 +0000 |
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doc/SE-J100-target article written
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1 Sony Ericsson J100 target support in FreeCalypso |
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2 ================================================ |
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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 |
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5 FreeCalypso, joining the already-supported Mot C1xx and Pirelli DP-L10. This |
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6 target is really not interesting at all on its own merit, instead it has been |
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7 added to FC Magnetite for testing purposes: to verify that we are able to drive |
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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 |
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12 case design, totally different battery and accessory connectors), in core |
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13 technical terms this SE J100 phone is still Compal, same as Mot C1xx. It is |
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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 |
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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 |
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28 procedure for Mot C139 in C1xx-Howto, with the following differences: |
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29 |
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30 * You need to build a firmware image specifically for the j100 target |
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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 |
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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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43 Connecting the serial interface (the obvious prerequisite before one can do any |
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44 kind of firmware hacking) is a lot more difficult on the SE J100 compared to |
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45 Mot C1xx. Following Sony Ericsson's product line, this J100 phone does not have |
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46 round-jack headset or charger connectors, instead all accessories (charger, |
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47 headsets, Calypso UART access) are connected through a multi-pin connector (12 |
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48 pins to be exact) that was used by SE across their product line. While there |
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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 |
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55 and TxD on the J100 are the same pins which carry USB data lines on some other |
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56 SE phones which (unlike J100) have an official data services / computer |
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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 |
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64 problem: the wires inside the cut-apart SE-clone USB-to-phone cable are |
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65 extremely thin (can't be any thicker than 28 AWG, and seemed to be even thinner |
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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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71 find a USB female-A connector part to which you can solder your own wires (or |
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72 cut apart some other cable that terminates in a USB female-A socket), make a |
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73 cable contraption consisting of this USB female-A on one side (into which you |
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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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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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79 FT232R or CP2102, so you can use GSM-specific high baud rates (GSM-specific |
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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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87 that it is very difficult to connect both a charging power source and Calypso |
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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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90 pure luck I acquired an unusual kind of SE charging adapter: this rare adapter |
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91 has a pass-through mechanical design, such that one can plug this charging |
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92 adapter into the phone and then piggy-back another accessory into it! However, |
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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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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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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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104 this target, if you have no serial connection, you have no way of seeing how |
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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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108 Because we don't have working battery charging on this SE J100 target yet, the |
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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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110 these phones (or another phone of a different model that takes the same |
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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. |