[cdc_vcom.c]adapt to both v1 and v2 of serial
@@ -939,9 +939,12 @@ static void rt_usb_vcom_init(struct ufunction *func)
config.parity = PARITY_NONE;
config.bit_order = BIT_ORDER_LSB;
config.invert = NRZ_NORMAL;
+#if defined(RT_USING_SERIAL_V1)
+ config.bufsz = CDC_RX_BUFSIZE;
+#elif defined(RT_USING_SERIAL_V2)
config.rx_bufsz = CDC_RX_BUFSIZE;
config.tx_bufsz = CDC_TX_BUFSIZE;
-
+#endif
data->serial.ops = &usb_vcom_ops;
data->serial.serial_rx = RT_NULL;
data->serial.config = config;
