STM32F103 USB problem with custom Hardware with cubeMX software (basic example), It doesn't work.

[MOhamed_Mehery]

I'm using stm32f103 in my hardware, I didn't put pull-up resistor to USB _ D+ pin.

The device doesnot appear on PC.
Is there any way to make it work without Hardware changes?

[AScha.3 · Accepted solution]

>Is there any way to make it work?

yes.

add 1k5 pull-up resistor to USB _ D+ pin. - without 1k5 , no enumeration.

you edit :

>Is there any way to make it work without Hardware changes?

no.

[gbm]

Also, generally, if you call Transmit from the main loop, the USB will sooner or later hang.