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carleslsregner
Associate III
May 14, 2026
Question

[STM32G051G8] Is this the st bootloader?

  • May 14, 2026
  • 3 replies
  • 165 views

I was wondering what is that. I created a custom bootloader firmware and application firmware. But once I successfully uploaded. When I send application firmware resquest I do not receive application firmware responses. Why is that? what is that? do you recognize that? 

The AA 01 00 00 BB is the application firmware request frame. 

0xAA is the begining

0x01 is the length

0x00 is the frame request ID 

0x00 is the checksum

0xBB is the end of the frame 

carleslsregner_0-1778737957419.png

Thanks for all. 

3 replies

waclawek.jan
waclawek.jan
Super User
May 14, 2026

Is this UART?

Too many 1s (FFs and similar) usually indicate baudrate mismatch. Factory bootloader autobauds, do that's unlikely to be the culprit. 

Using debugger may help immensely. 

JW

    C
    carleslsregnerAuthor
    Associate III
    May 14, 2026

    What kind of baudrate mismatch. All is at 9600 baud rate. 

    waclawek.jan
    waclawek.jan
    Super User
    May 14, 2026

    Well, you don't know what is it what's responding to you. That is running at a different baudrate.

    Observe the reply using oscilloscope or logic analyzer and infer the baudrate from the shortest pulse length. Or listen to it using a terminal program in PC which allows you to change baudrate and display framing errors.

    It may well be your program, too, with misconfigured clocks or UART.

    JW

      mƎALLEm
      mƎALLEm
      Technical Moderator
      May 14, 2026

      Hello,

      The question is not clear.

      You are using a custom bootloader on LPUART and you are asking about ST bootloader in the title? knowing that ST bootloader doesn't use LPUART for that device:

      AN2606: 

      mALLEm_0-1778748615767.png

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