USB CDC CubeMX bug in generated code

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