Question
STM32L552RET, USB connection only throuth Error 43
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.