Commit of new class abstraction APIs for all device demos other than the MIDI demo - not documented yet.

Removed scheduler and memory allocation libraries.

Added new EVENT_USB_StartOfFrame event in the library to indicate the start of each USB frame (when generated).

Removed Tx interrupt from the USBtoSerial demo; now sends characters via polling to ensure more time for the Rx interrupt.

LUFA/Drivers/USB/HighLevel/USBInterrupt.c

@@ -180,6 +180,15 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 
 		EVENT_USB_Reset();
 	}
+	
+	if (USB_INT_HasOccurred(USB_INT_SOFI) && USB_INT_IsEnabled(USB_INT_SOFI))
+	{
+		USB_INT_Clear(USB_INT_SOFI);
+
+		FrameElapsed = true;
+		
+		EVENT_USB_StartOfFrame();
+	}
 	#endif
 	
 	#if defined(USB_CAN_BE_HOST)
@@ -232,6 +241,15 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 
 		USB_ResetInterface();
 	}
+
+	if (USB_INT_HasOccurred(USB_INT_HSOFI) && USB_INT_IsEnabled(USB_INT_HSOFI))
+	{
+		USB_INT_Clear(USB_INT_HSOFI);
+
+		FrameElapsed = true;
+		
+		EVENT_USB_StartOfFrame();
+	}
 	#endif
 
 	#if defined(USB_CAN_BE_BOTH)