Solved
STM32 system boot USART
Hello.
There is a board with 2 stm32 MCU, one of them is stm32l452. I need to upload a firmware to stm32l452 using system boot. When it starts in system boot mode, second MCU sends 0x7F waiting acknowlenge byte (0x79) but there isn't a responce. After I added a complement (0x80) and started to send {0x7F, 0x80} frame, a responce was received, but not 0x79. After the first transmission 0xf1 byte was received, after second - 0xff and further - 0x7F. Sending any other frame from AN3155 I receive 0x7F. UART settings are correct, baud rate is 115200, but I used less too. What am I doing wrong?
Best regards,
Den
