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USB CDC VCP help to receive Data from PC

Question asked by york.maxim on Jul 9, 2013
Latest reply on Jul 17, 2013 by

Hello everybody (This about USB VCP)
i started an application to send and receive data from PC to STM32F4 discovery
i used the titorial provided by STmicro, but the problem i'm not able to sent to the STM32F4Discovery (PC to STM32), only from Discovery to PC

i use this function to send to PC, she work fine, but i can't find how receive data from PC, anything can help me.

The function blow provide to send Data to PC
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len)
  if (linecoding.datatype == 7)
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
  else if (linecoding.datatype == 8)
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
  /* To avoid buffer overflow */
  if(APP_Rx_ptr_in == APP_RX_DATA_SIZE)
    APP_Rx_ptr_in = 0;
  return USBD_OK;