= Motorola C155 =

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.

Specifications * GSM 900 / GSM 1800 dual-band * 101x45x21 mm, 86 grams * GPRS * 920mAh Li-Ion battery * Ti Calypso/Iota/Rita chipset Hardware

=== GSM Chipset ===

• DBB: Ti Calypso Baseband, D751749GHH model (Calypso Lite G2), includes 256kBytes of internal SRAM
• ABB: Ti TWL3014C
• RF: TRF6151C
• RF PA: SKY77324-12

=== NOR Flash + SRAM === * Intel RD38F2030W0ZBQ1 * 64MBit NOR (8 MByte), bottom boot * 16Mbit SRAM (2 MByte) * Data sheet is in our git repository

=== Display ===

The display is a 96x64 pixels CSTN color LCD, attached via SPI bus to the Calypso DBB chip.

The LCD controller inside the display is a Ultrachip UC1682, for which the data sheet is available at [http://www.datasheet4u.com/html/U/C/1/UC1682_UltraChip.pdf.html].
We need a proper C language driver for it (any volunteers?)

=== Test Points ===

==== Test points accessible from battery compartment ====

Left Row of pins (from left to right * TP108 -- GND * TP29 -- GND (used to be VADCID) * TP37 -- GND (used to be Rx IRDA) * TP27 -- DLPWR (download power on), connects to Iota:RPWON * TP36 -- GND (used to be Tx IRDA) * TP10 -- DTR Modem

Right row of pins (from left to right) * TP8 -- TDI JTAG * TP11 -- DSR Modem * TP9 -- CTS Modem * TP18 -- TMS JTAG * TP13 -- TxD Modem * TP16 -- TDO JTAG * TP21 -- RTS Modem * TP17 -- TCK JTAG * TP14 -- RxD Modem * TP3 -- DLPWR

Misc Notes

=== Bootloader ===

The RAM loader of the C155 assumes that the payload is a THUMB binary. [wiki:compal_dnload] thus always prefixes the payload with 32bit of
object code to switch back to ARM mode before jumping to the start routine.