Solved
ST Link Virtual Com Port - USBD_CDC_Init() never called
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
