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TFalk.1
Visitor II
March 5, 2023
Question

STM32L552RET, USB connection only throuth Error 43

  • March 5, 2023
  • 1 reply
  • 951 views

I am working on a schole projekt and there I neded to design a PCB that can talk to the PC over USB. whiel doing that I am not able to figure aout whie the USB connection dous not work if it is not set for programming.

In detail:

The USB Connection is ISOLATED with a ADUM3160.

When I set BOOT0 to HIGH for programming over USB, everything works fine.

When I set it to LOW for using it as a Virtual Com Port it dous not work, I triued other Middle ware states suche as HID but the same error code 43.

I trued enabeling the Pullup from the Isolater only five secondes after everything was initilysed but that did not work.0693W00000aICqJQAW.png

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    1 reply

    I
    Imen.D
    Technical Moderator
    March 7, 2023

    Hello @TFalk.1​ and welcome to the Community :)

    Have a look to this FAQ: USB device not recognized, it may help you.

    Check the jumpers removed, and I advise you to validate your USB CDC configuration with a basic USB CDC device application in the STM32 USB training.

    Best Regards,

    Imen

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