I'm using the STM32F401RE in a new design and trying connect the USB CDC device interface to FreeRTOS_CLI. I modified its _write function to call CDC_Transmit_FS, but I don't see a received data callback where I can add a xTaskNotifyFromISRfor to send data to the CLI task.
It looks like I call CDC_Receive_FS to get the data, but I need an interrupt to trigger the call to that function. Where can I hook in a callback function?
In the callback, you call your own function to save the data that's in Buf. Then in your main loop you can parse the data as you don't want to do any processing in the callback.
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
USBD_CDC_ReceivePacket(&hUsbDeviceFS);
USB_AddRxBuffer(&usb_msg, Buf, *Len); // you own function to save the Buf/Len data and set a flag that indicaes you have new data
return (USBD_OK);
/* USER CODE END 6 */
}
Transmitting if pretty simple. You just pass your buffer and size
uint8_t dataBuf[128] = {0};
// update dataBuf with your data
// send your data
status = CDC_Transmit_FS(dataBuf , dataLen);
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.