Command sequence for USART bootloader on stm32G4 MCU

[shraddhs10]

Hello,

I am trying to flash the MCU with USART bootloader

I am using the command codes from below link, but are not working for me

Can someone help me validate of the command codes are correct for STM32G4

https://www.st.com/resource/en/application_note/cd00264342-usart-protocol-used-in-the-stm32-bootloader-stmicroelectronics.pdf

Current setup:

I have connected the STM32 USART4 to my R PI device. It gets enumerated as /dev/ttyUSB0

Below is the serial code using python

import serial

ser = serial.Serial(

        port='/dev/ttyUSB0',

        baudrate=57600,

        parity=serial.PARITY_EVEN,

        stopbits=serial.STOPBITS_ONE,

        bytesize=serial.EIGHTBITS,

        timeout=10

)

# Command to select the USART bootloader

ser.write(b'\x7F')

ser.read(1) # Reading 1 byte of data to check ACK from the MCU

TIA

[Tesla DeLorean]

Going to be as described in AN2606 for the pins and AN3155 for the UART

Pretty sure UART4 has NO involvement, read and understand expectation from AN2606..

[mƎALLEm · Accepted solution]

Nice catch @Tesla 

Even you didn't mention the exact G4 part number but UART4 is not used for G4 bootloader.

You can refer to the AN2606 tables Table 99 / Table 101 / Table 103: Only USART1, 2 and 3 are used for bootloader.