Firmware for stm32 used for USB-CAN transceiver. This program have some limitation from original firmware, like it don't works with external eeprom, that is on PCB. I'm not sure, how exactly is used this eeprom in original program, maybe for storing CAN data in ofline mode?
STM32CubeMX - for compiling of project
Demonstrator GUI - for flashing of stm32 trough serial port
git clone https://github.com/muhammadyasir-dev/usb-firmware
cd usb-firmware
make
st-flash write ./.pio/build/bluepill_f103c6/firmware.bin 0x08000000
Stm32 have build in bootloader for flashing through uart interface. The same uart interface is used also for transceivering of CAN bus data trought USB. This good behavior enables flashing of stm32 without any programmer.
For setting st32 into boot mode is needed these steps:
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turn off USB cable from PC
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connect pads together on this picture bellow and hold them
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turn on USB cable into PC
Now is stm32 in boot mode and is waiting for flassing. For Flashing of stm trough serial port is used program "Demonstrator GUI". This program is possible free download from internet. Breafly description how is possible flashing of stm is somewere on web sites.