Posted on November 03, 2017 at 10:59Hi there,
I am trying to Transmit data over USB CDC after receiving a command, So I need call cdc transmit function inside cdc rx function in which I am comparing the received data.
But i am able to use only 1 cdc_tx function. when I am calling more than 1 tx function it is not functioning..
Following are the cdc tx and rx functions that I am using:-
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)
{
uint8_t result = USBD_OK;
/* USER CODE BEGIN 7 */
USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef*)hUsbDeviceFS.pClassData;
if(USB_CONNECTED)
{
while(hcdc->TxState != 0);
}
/*if (hcdc->TxState != 0){
return USBD_BUSY;
}*/
USBD_CDC_SetTxBuffer(&hUsbDeviceFS, Buf, Len);
result = USBD_CDC_TransmitPacket(&hUsbDeviceFS);
/* USER CODE END 7 */
return result;
}
static int8_t CDC_Receive_FS (uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
//printf('\n\r%d\n\r',*Buf);
if(Buf[0]=='i')
{
CDC_Transmit_FS((uint8_t *)'\n\r Hello\n\r',strlen((const char *)
'\n\r
Hello
\n\r'
));
CDC_Transmit_FS((uint8_t *)'\n\r
Hello\n\r',strlen((const char *)
'\n\r
Hello
\n\r'
));
}
USBD_CDC_ReceivePacket(&hUsbDeviceFS);
return (USBD_OK);
/* USER CODE END 6 */
}
I am using STM32F2 nucleo board
CubeMX v 4.22.0
