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G
Gifford
Visitor II
March 23, 2025
Solved

STM32F411 Bootloader hangs

  • March 23, 2025
  • 2 replies
  • 1501 views

Hi there!

I've created a custom STM32F411CEU6 Board with external HSE und LSE. While the HSE works when running my user program, the Bootloader hangs within boot phase (i think).

When starting bootloader, BOOT0=1 und BOOT1=0. I powered direcly on VDD, no USB. I received no answer on both uarts after sending 0x7F. I also can't connect via stmcubeprogrammer. Only can only connect with stlinkv2.

I think it may be a hardware issue, but I can't find a solution.

Crystal 25Mhz: https://atta.szlcsc.com/upload/public/pdf/source/20240329/19D5F850207469550BEB00D7DFEDBC7A.pdf

LSE:

https://atta.szlcsc.com/upload/public/pdf/source/20240418/0E0FF5F0356BA3753F616001439D1416.pdf

Gifford_0-1742722709972.pngGifford_1-1742722726214.png

Gifford_2-1742722747432.pngGifford_3-1742722763253.png

 

    This topic has been closed for replies.
    Best answer by TDK

    Here are the two pin configurations listed in AN2606 as supported:

    TDK_0-1742759211946.png

    If you don't have PD5/PD6 on your chip, you can't use those, so PA9/PA10 are the only ones available for you.

     

    > I've checked uart1: PA10 PA9 -> it works, bootloader starts!

    Good! Shows things are working as expected.

     

    > uart2: PA3, PA3 -> doesn't work

    PA3 won't work as it isn't listed in AN2606.

    2 replies

    A
    AScha.3
    Super User
    March 23, 2025

    Hi,

    i cannot see SWD+SWC , for debug, or connect ; is it there ?

    T
    TDK
    Super User
    March 23, 2025

    After trying to launch the bootloader, you can then connect with STM32CubeProgrammer over SWD and example the PC register and confirm it's 0x1Fxxxxxx.

    > I received no answer on both uarts after sending 0x7F.

    Which UARTs and pins? It's not shown in your pictures. Are they listed as supported in AN2606?

    Schematic seems workable. It has minor issues which I don't believe will cause issues for basic bootloader functionality:

    • Missing 0.1uF decoupling caps.
    • VCAP cap should be 4.7 uF
    G
    GiffordAuthor
    Visitor II
    March 23, 2025

    thanks for all responses!

    @AScha.3 SWD works and is connected.

    I've checked uart1: PA10 PA9 -> it works, bootloader starts!

    uart2: PA3, PA3 -> doesn't work

    AN2606 writes Port "PD", but I havn't any PORT D ...

    I can connect with SWD but cannot find any PC register. On which address? Or where can I find it in STM32CubeProgrammer?

    find register log attached ...

    T
    TDKAnswer
    Super User
    March 23, 2025

    Here are the two pin configurations listed in AN2606 as supported:

    TDK_0-1742759211946.png

    If you don't have PD5/PD6 on your chip, you can't use those, so PA9/PA10 are the only ones available for you.

     

    > I've checked uart1: PA10 PA9 -> it works, bootloader starts!

    Good! Shows things are working as expected.

     

    > uart2: PA3, PA3 -> doesn't work

    PA3 won't work as it isn't listed in AN2606.

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