/* user call this function to send data to cdc device  */
void usb_host_cdc_senddata(uint8_t *data, uint16_t length)
/* user call this function to send data to cdc device  */
void usb_host_cdc_senddata(uint8_t *data, uint16_t length)
{
    if (CDC_TxParam.CDCState == CDC_IDLE) {
        CDC_TxParam.pRxTxBuff = data;
        CDC_TxParam.DataLength = length;
        CDC_TxParam.CDCState = CDC_SEND_DATA;
    }
}