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README.md

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Compiling

CFLAGS="-DISR_STACK_SIZE=2048 -DSTDIO_UART_BAUDRATE=115200 -DSERIAL_BAUDRATE=115200" DRIVER=sx1272 BOARD=im880b make

Flashing through serial port

stm32flash -w bin/im880b/lora_GPS.bin /dev/ttyUSB0
stm32flash -w bin/im880b/lora_GPS.bin /dev/ttyUSB1

Flashing through STLink/v2

Using either a STLink/v2 interface (left half of the figure) OR a Discovery Board fitted with the STLink connector (e.g. STM32F407G-Discovery) whose upper half provides debugging capability after opening the two jumpers for selecting either STLink or Discovery capability (see page 17 of https://www.st.com/resource/en/user_manual/dm00039084-discovery-kit-with-stm32f407vg-mcu-stmicroelectronics.pdf)

openocd -f interface/stlink-v2.cfg -f target/stm32l1.cfg

and

gdb-multiarch  bin/im880b/lora_GPS.elf
  target extended-remote localhost:3333