stm32 USB-CDC after hardware reset

Question

i have programmed my stm32f103 blue-pill board with USB-CDC protocol

I can read and write on this Port

But after performing a hardware reset, the COM port is unavailable I have to unplug the USB connection and re-plug it again then the COM port appears.

Is it possible to avoid this?

-Thanks

Answer 1

If you reset the bluepill you need to pull down the D+ line for several milliseconds to let know the host that it has to start the enumeration process.