maxpetukhov / bc200 Goto Github PK

coospo bc200 - bike computer from aliexpress

PCB revision: v5.4

• cpu: nrf52840 - cortex-m4 (integrated BLE, USB); 256kb ram; 1mb flash
• external flash: GD25Q127C - qspi 16mb nor flash
• display: BTG-160240D - monochrome, sunreadeble lcd with backlight have 160x240 resolution and based on ST75320 controller
• 4 buttons
• 1300mah lipo battery + charger
• 12mm piezo buzzer
• gps + glonass + beidou module
• hx3203 - light sensor
• qmp6988 - digital barometric pressure sensor

test fw based on zephyr os (build instructions)
works:

• lcd display + contrast + backlight + lvgl graphic lib
• buttons
• qspi flash + fatfs + usb mass storage
• fw upgrade via usb usign original image format. upgrade possible in both direction orig fw <-> zephyr os fw (video of process)
• need to fix qspi flash speed

jlink connected to SDO and SCLK testpoints
erase all data (exclude qspi flash) and protection, and programm only full flash exclude protection

nrfjprog -f NRF52 --log --recover
nrfjprog -f NRF52 --log --program full_flash.bin

switch NFC antenna pins to GPIOs - used as buttons (first cmd enable write possibility to UICR,second - write needed value)

nrfjprog -f NRF52 --ramwr 0x4001E504 --val 0x00000001
nrfjprog -f NRF52 --ramwr 0x1000120C --val 0xfffffffe

https://mysensors-rus.github.io/Blue-pill-to-JLink/
https://github.com/GCY/JLINK-ARM-OB
http://forum.easyelectronics.ru/viewtopic.php?p=651817#p651817

https://github.com/atc1441/ESP32_nRF52_SWD
https://limitedresults.com/2020/06/nrf52-debug-resurrection-approtect-bypass/

faketime -f "x0.1" ./nrfjprog --jdll <full path>/JLink_Linux_V752a_x86_64/libjlinkarm.so -f NRF52 --log --qspiini nrfjprog_qspi_gd25q127c.ini --readqspi qspi.bin

faketime -f "x0.1" - need because nrfjprog work with my defective jlink from bluepill continuously only 32sec and this time is not enough for reading qspi flash

util for decrypt and encrypt firmware and font for usb upgrade

fw start from 0x31000
spi flash contain font from 0 offset and fatfs disk from 0x380000 offset