ST Link Virtual Com Port - USBD_CDC_Init() never called

[SonoClock110]

Hi together,

I'm trying to use the ST Link Virtual Com Port on a STM32H745 DISCO board. For this I created a project with the CubeIDE and configured it as explained on many websites and YouTube clips.

I also see ST Virtual Com Port in the windows device manager (and also the ttyACM0 on a Linux machine).

In the main() I call the MX_USB_DEVICE_Init() and in a cyclic thread I call the CDC_Transmit_FS() to sent some bytes. But in the CDC_Transmit_FS() the 

hcdc->TxState in

if (hcdc->TxState != 0){ ... }

will never be 0.

After some debugging I found that the function USBD_CDC_Init() is never called. I get interrupts for the USB and HAL_PCD_IRQHandler() is called but never reach the 

/* Handle Enumeration done Interrupt */

if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_ENUMDNE))

It stucks in the 

/* Handle Suspend Interrupt */

if (__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP))

part.

Do you have any idea whats going wrong here?

Thanks!

Christoph

[Billy OWEN · Accepted solution]

Hi @SonoClock110 

The forum moderator had marked your post as needing a little more investigation and direct support. An online support case has been created on your behalf, please stand by for just a moment and you will hear from us.

Regards,

Billy