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