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Zephyr S
Zephyr S
Associate II
June 16, 2020
Question

Is there a specific manipulation to do to communicate with UART bootloader using a second microcontroller as host ?

  • June 16, 2020
  • 2 replies
  • 866 views

Hello,

I am trying to communicate with the UART bootloader (NUCLEO64 F446E) using a second board (NUCLEO32 L432KC).

I am using USART1 (PA_9, PA_10), on which I am trying to send the 0x7F frame to activate UART bootloader (after having activated bootloader Mode using BOOT pins), but I get no answer.

I tried different baudrates even if the AN3155 tells the baudrate is calculated after the reception of the 0x7F frame.

Also, I am using HAL_UART_Receive and Hal_UART_Transmit (with no interrupt) to send and receive data.

I really hope someone could help me.

Thanks in advance :)

This topic has been closed for replies.

2 replies

waclawek.jan
waclawek.jan
Super User
June 16, 2020

Do you have parity set correctly? Note that in STM32, parity bit is counted up to the total number of bits.

JW

Tesla DeLorean
Tesla DeLorean
Guru
June 16, 2020

You get one-shot after reset to establish the baud rate with the 0x7F pattern.

Show the initialization code. Likely want 9600 Even Parity (will be 9-bit setting on STM32 side) to start with.

Should be able to use HAL_UART_Transmit/Receive to walk the loader along.

Start with simple query commands, checking the response and checksum byte

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