X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/cec699ac591a679010e07431dfb17823a79856df..d26a9ed5fd6fc60a0dfa61d04f5ae2bd7163a85d:/LUFA/Drivers/USB/Class/Device/CDC.c

diff --git a/LUFA/Drivers/USB/Class/Device/CDC.c b/LUFA/Drivers/USB/Class/Device/CDC.c
index 16bc01549..b8a673f03 100644
--- a/LUFA/Drivers/USB/Class/Device/CDC.c
+++ b/LUFA/Drivers/USB/Class/Device/CDC.c
@@ -190,10 +190,17 @@ uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterface
 
 	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);
 
-	if (Endpoint_IsOUTReceived() && !(Endpoint_BytesInEndpoint()))
-	  Endpoint_ClearOUT();
+	if (Endpoint_IsOUTReceived())
+	{
+		if (!(Endpoint_BytesInEndpoint()))
+		  Endpoint_ClearOUT();
 
-	return Endpoint_BytesInEndpoint();
+		return Endpoint_BytesInEndpoint();
+	}
+	else
+	{
+		return 0;
+	}
 }
 
 uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)