Posted on February 06, 2016 at 22:31
Hello, in the file usbd_cdc_if.c there is this function:
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)
{
uint8_t result = USBD_OK;
/* USER CODE BEGIN 7 */
USBD_CDC_SetTxBuffer(hUsbDevice_0, Buf, Len);
while(result != USBD_OK);
do {
result = USBD_CDC_TransmitPacket(hUsbDevice_0);
}
while(result != USBD_OK);
/* USER CODE END 7 */
return result;
}
those lines:
while(result != USBD_OK);
do {
result = USBD_CDC_TransmitPacket(hUsbDevice_0);
}
while(result != USBD_OK);
don't make many sense and might lead to potential deadlock bcs. the situation is not resolved within timeout.
Happyly the function
USBD_CDC_TransmitPacket
always returns USBD_OK. So in this version it will not lead to deadlock.
Please provide a more professional solution.
Regards, Adib.
#usb-cdc-stm32-cubemx
