Added new NO_CLASS_DRIVER_AUTOFLUSH compile time option to disable automatic flushing of interfaces when the USB management tasks for each driver is called.

The MIDI class drivers now automatically flushes the MIDI interface when the MIDI class driver's USBTask() function is called.

LUFA/Drivers/USB/Class/Device/MIDI.c

@@ -76,6 +76,16 @@ bool MIDI_Device_ConfigureEndpoints(USB_ClassInfo_MIDI_Device_t* const MIDIInter
 	return true;
 }
 
+void MIDI_Device_USBTask(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
+{
+	if (USB_DeviceState != DEVICE_STATE_Configured)
+	  return;
+
+	#if !defined(NO_CLASS_DRIVER_AUTOFLUSH)
+	MIDI_Device_Flush(MIDIInterfaceInfo);
+	#endif
+}
+
 uint8_t MIDI_Device_SendEventPacket(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo,
                                     const MIDI_EventPacket_t* const Event)
 {