MotorolaC155 » History » Version 17
laforge, 01/19/2022 08:47 AM
| 1 | 15 | laforge | {{>toc}} |
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| 2 | 1 | laforge | |
| 3 | 15 | laforge | h1. Motorola C155 |
| 4 | |||
| 5 | 1 | laforge | The C155 seems to be one of many ODM phones that Motorola bought from Compal communications in Taiwan. It is of the same family as the C118, C123, etc. |
| 6 | |||
| 7 | The internal name of the hardware is E99. |
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| 8 | 17 | laforge | |
| 9 | {{thumbnail(c155.jpg)}} |
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| 10 | 1 | laforge | |
| 11 | 15 | laforge | Compared to the [[MotorolaC123]], this phone offers |
| 12 | * a color LCD (same resolution) |
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| 13 | * four times bigger RAM (2MByte) |
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| 14 | * four times bigger NOR Flash (8MByte) |
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| 15 | * JTAG seems accessible, though this is unconfirmed |
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| 16 | 1 | laforge | |
| 17 | |||
| 18 | 15 | laforge | h2. Specifications |
| 19 | |||
| 20 | * GSM 900 / GSM 1800 dual-band |
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| 21 | * 101x45x21 mm, 86 grams |
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| 22 | * GPRS |
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| 23 | * 920mAh Li-Ion battery |
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| 24 | * Ti Calypso/Iota/Rita chipset |
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| 25 | |||
| 26 | |||
| 27 | h2. Hardware |
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| 28 | |||
| 29 | 16 | laforge | !c155_pcb.jpg! |
| 30 | !osmocom_c155.jpg! |
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| 31 | 1 | laforge | |
| 32 | 15 | laforge | h3. Schematics |
| 33 | |||
| 34 | |||
| 35 | 1 | laforge | Schematics ( Sch_C155_A3_C_L3_1.0.pdf ) can be found on this site: http://globalsupport.ru/file.php?id=48&oper=d (among others). The captcha is a b**** but it'll work in the end. |
| 36 | |||
| 37 | |||
| 38 | 15 | laforge | h3. GSM Chipset |
| 39 | 1 | laforge | |
| 40 | |||
| 41 | 15 | laforge | * DBB: Ti Calypso Baseband, D751749GHH model (Calypso Lite G2), includes 256kBytes of internal SRAM |
| 42 | * ABB: Ti TWL3014C |
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| 43 | * RF: TRF6151C |
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| 44 | * RF PA: SKY77324-12 |
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| 45 | 1 | laforge | |
| 46 | 15 | laforge | |
| 47 | h3. NOR Flash + SRAM |
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| 48 | |||
| 49 | * Intel RD38F2030W0ZBQ1 |
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| 50 | ** 64MBit NOR (8 MByte), bottom boot |
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| 51 | ** 16Mbit SRAM (2 MByte) |
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| 52 | * Data sheet is in our git repository |
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| 53 | |||
| 54 | |||
| 55 | h3. Display |
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| 56 | |||
| 57 | |||
| 58 | 14 | laforge | The display is a 98x67 pixels CSTN color LCD (12Bit, 4096 Colors), which is attached via UWire to the Calypso DBB chip. |
| 59 | 3 | laforge | |
| 60 | 15 | laforge | The LCD controller inside the display is a Solomon SSD1783 (using an extended Epson commandset), for which the datasheet is available at "We now have a basic text-only driver. |
| 61 | 1 | laforge | |
| 62 | |||
| 63 | 15 | laforge | h3. Audio Ringtone Chip |
| 64 | 1 | laforge | |
| 65 | |||
| 66 | 15 | laforge | It uses a [[RingtoneChips#SunplusSPMA100B|Sunplus SPMA100B"httpwwwdensitroncomuploadedFilesDisplaysSupportSSD1783pdf]]. chip. There is no datasheet available from Sunplus, but however, the Chip is pin-compatible with the Yamaha YMU759 MA-2 (Mobile Audio 2). But even for this chip there is no register level datasheet available. |
| 67 | |||
| 68 | |||
| 69 | h3. Test Points |
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| 70 | |||
| 71 | |||
| 72 | |||
| 73 | h4. Test points accessible from battery compartment |
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| 74 | |||
| 75 | 16 | laforge | !compal_testpads.png! |
| 76 | 1 | laforge | |
| 77 | Left Row of pins (from left to right |
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| 78 | 15 | laforge | * TP108 -- GND |
| 79 | * TP29 -- GND (used to be VADCID) |
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| 80 | * TP37 -- GND (used to be Rx IRDA) |
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| 81 | * TP27 -- DLPWR (download power on), connects to Iota:RPWON |
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| 82 | * TP36 -- GND (used to be Tx IRDA) |
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| 83 | * TP10 -- DTR Modem |
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| 84 | 1 | laforge | |
| 85 | 4 | laforge | Right row of pins (from left to right) |
| 86 | 15 | laforge | * TP8 -- TDI JTAG |
| 87 | * TP11 -- DSR Modem |
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| 88 | * TP9 -- CTS Modem |
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| 89 | * TP18 -- TMS JTAG |
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| 90 | * TP13 -- TxD Modem |
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| 91 | * TP16 -- TDO JTAG |
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| 92 | * TP21 -- RTS Modem |
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| 93 | * TP17 -- TCK JTAG |
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| 94 | * TP14 -- RxD Modem |
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| 95 | * TP3 -- DLPWR |
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| 96 | 1 | laforge | |
| 97 | |||
| 98 | 15 | laforge | h3. PCB photographs |
| 99 | 1 | laforge | |
| 100 | |||
| 101 | 15 | laforge | Available from "h2. Misc Notes |
| 102 | 1 | laforge | |
| 103 | 15 | laforge | |
| 104 | |||
| 105 | h3. Bootloader |
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| 106 | |||
| 107 | |||
| 108 | The RAM loader of the C155 assumes that the payload is a THUMB binary. [[osmocon"httplaforgegnumonksorgphotoalbumdevicesmotorola_compalc155]] thus always prefixes the payload with 32bit of |
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| 109 | 1 | laforge | object code to switch back to ARM mode before jumping to the start routine. |
