X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/071e02c6b6b4837fa9cf0b6d4c749994e02638d7..9274610a483bb5ed1ea7ef752e4a6b2b1601e7a8:/Demos/Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c

diff --git a/Demos/Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c b/Demos/Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c
index cc8f92ccd..ffbc12c7f 100644
--- a/Demos/Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c
+++ b/Demos/Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c
@@ -101,12 +101,12 @@ int main(void)
 		CheckJoystickMovement();
 
 		/* Discard all received data on the first CDC interface */
-		while (CDC_Device_BytesReceived(&VirtualSerial1_CDC_Interface))
-		  CDC_Device_ReceiveByte(&VirtualSerial1_CDC_Interface);
+		CDC_Device_ReceiveByte(&VirtualSerial1_CDC_Interface);
 
 		/* Echo all received data on the second CDC interface */
-		while (CDC_Device_BytesReceived(&VirtualSerial2_CDC_Interface))
-		  CDC_Device_SendByte(&VirtualSerial2_CDC_Interface, CDC_Device_ReceiveByte(&VirtualSerial2_CDC_Interface));
+		int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial2_CDC_Interface);
+		if (!(ReceivedByte < 0))
+		  CDC_Device_SendByte(&VirtualSerial2_CDC_Interface, (uint8_t)ReceivedByte);
 		  
 		CDC_Device_USBTask(&VirtualSerial1_CDC_Interface);
 		CDC_Device_USBTask(&VirtualSerial2_CDC_Interface);