12-31-2020, 10:36 PM
OK, you can send me the video, we will check. the new firmware include the bootloader function. so when you power on ,begin 5 seconds, there is wait for bootloader, after 5 seconds controller will begin to work. when you update the new firmware of MCU, next time, you can update firmware by RS232 port , not need to use ST-Link cable again.