More Information about this tracker.
http://gpstrackerblog.com/2011/10/pearl-gt170-im-test/
Take a look inside the Tracker.
Side 1
SIM Card
10 Pin USB Connector
Side 2
Chips:
MT 6223 DA Baseband Processor 26 Mhz
TV00560002EDGB Nor Flash and SRAM
SKY 77554 TX RX Unit
AD6548 GSM Radio Unit
10 Pin USB on side 1
| Pin | Function |
| 1 | |
| 2 | 5 Volt |
| 3 | |
| 4 | Power Key ( pulling low = turning on) |
| 5 | UART RX Device → PC ( 3.3 Volt ) |
| 6 | UART Tx PC → Device ( 3.3 Volt ) |
| 7 | |
| 8 | |
| 9 | |
| 10 | |
| 11 | GND |
| 12 | GND |
JTAG Pinning
No JTAG pins on board.
The GPS Module
GPS Module → MT6223 Uart 2 RX 9600
Baud 8n1 NEMA
$PJRC011,JRCGPS*08
$PJRC010,001*27
$GPTXT,01,01,02,ANTSTATUS=OPEN*2B
$GPGGA,235945.035.......
PINs on Side2
| Pin | Function |
| 1 | GND |
| 2 | PWR Key |
| 3 | Row 0 |
| 4 | Row 1 |
| 5 | Col 0 |
| 6 | Col1 |
| 7 | Row 2 |
| Pin | Function |
| SDA | GPIO46 URTS1_B |
| SCL | GPIO45 UCTS1_B |
| GPO | GPIO31 SRCLKENAI |
My development system
USB to RS232 converter 3.3 Volt
Green power on switch
10 Pin USB connector from the charging cable
More Information and some sample code
https://github.com/mandl/MTK_Loader
Building QEMU
https://github.com/mandl/fernvale-qemu
./qemu-system-arm -machine mt6223 -s -S
Using
https://github.com/radare/radare2
r2 -a arm -b32 -D gdb gdb://localhost:1234
Downloading the firmware
ToDo
Using osmoload (http://bb.osmocom.org/trac/ ) for down and uploading patched firmware.
Measurement
Tuning the AD6548 to an BCCH channel.
 |
| FCB Burst |
 |
| some data |
 |
| some data |
