Extend the automatic serial number descriptor code to read out and send all 10...

Extend the automatic serial number descriptor code to read out and send all 10 bytes (20 characters) of the internal serial number on supported AVRs, rather than just the first 6 bytes (12 characters).

LUFA/Drivers/USB/LowLevel/DevChapter9.c

@@ -232,10 +232,10 @@ static void USB_Device_GetInternalSerialDescriptor(void)
 	struct
 	{
 		USB_Descriptor_Header_t Header;
-		int16_t                 UnicodeString[12];
+		int16_t                 UnicodeString[20];
 	} SignatureDescriptor;
 	
-	uint8_t SigReadAddress  = 0x0E;		
+	uint8_t SigReadAddress  = 0x0E;
 	bool    OddNibbleRead   = false;
 
 	#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
@@ -246,7 +246,7 @@ static void USB_Device_GetInternalSerialDescriptor(void)
 		SignatureDescriptor.Header.bDescriptorType = DTYPE_String;
 	#endif
 
-	for (uint8_t SerialCharNum = 0; SerialCharNum < 12; SerialCharNum++)
+	for (uint8_t SerialCharNum = 0; SerialCharNum < 20; SerialCharNum++)
 	{
 		uint8_t SerialByte = boot_signature_byte_get(SigReadAddress);
 		

Projects/Magstripe/Descriptors.c

@@ -93,7 +93,7 @@ USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 		
 	.ManufacturerStrIndex   = 0x01,
 	.ProductStrIndex        = 0x02,
-	.SerialNumStrIndex      = NO_DESCRIPTOR,
+	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 		
 	.NumberOfConfigurations = 1
 };