Add symbolic names for USB Device String Descriptors within the demos, applications and bootloaders.

Bootloaders/CDC/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t DeviceDescriptor =
 	.ProductID              = 0x204A,
 	.ReleaseNumber          = VERSION_BCD(01.00),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -234,17 +234,17 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 			Size    = sizeof(USB_Descriptor_Configuration_t);
 			break;
 		case DTYPE_String:
-			if (!(DescriptorNumber))
+			if (DescriptorNumber == STRING_ID_Language)
 			{
 				Address = &LanguageString;
 				Size    = LanguageString.Header.Size;
 			}
-			else if (DescriptorNumber == 0x01)
+			else if (DescriptorNumber == STRING_ID_Manufacturer)
 			{
 				Address = &ManufacturerString;
 				Size    = ManufacturerString.Header.Size;
 			}
-			else if (DescriptorNumber == 0x02)
+			else if (DescriptorNumber == STRING_ID_Product)
 			{
 				Address = &ProductString;
 				Size    = ProductString.Header.Size;

Bootloaders/CDC/Descriptors.h

@@ -127,6 +127,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Bootloaders/DFU/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t DeviceDescriptor =
 	.ProductID              = PRODUCT_ID_CODE,
 	.ReleaseNumber          = VERSION_BCD(00.00),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -175,17 +175,17 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 			Size    = sizeof(USB_Descriptor_Configuration_t);
 			break;
 		case DTYPE_String:
-			if (!(DescriptorNumber))
+			if (DescriptorNumber == STRING_ID_Language)
 			{
 				Address = &LanguageString;
 				Size    = LanguageString.Header.Size;
 			}
-			else if (DescriptorNumber == 0x01)
+			else if (DescriptorNumber == STRING_ID_Manufacturer)
 			{
 				Address = &ManufacturerString;
 				Size    = ManufacturerString.Header.Size;
 			}
-			else if (DescriptorNumber == 0x02)
+			else if (DescriptorNumber == STRING_ID_Product)
 			{
 				Address = &ProductString;
 				Size    = ProductString.Header.Size;

Bootloaders/DFU/Descriptors.h

@@ -164,6 +164,17 @@
 			USB_Descriptor_DFU_Functional_t       DFU_Functional;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Bootloaders/Printer/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t DeviceDescriptor =
 	.ProductID              = 0x206B,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -186,15 +186,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = LanguageString.Header.Size;
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = ManufacturerString.Header.Size;
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = ProductString.Header.Size;
 					break;

Bootloaders/Printer/Descriptors.h

@@ -66,6 +66,17 @@
 			USB_Descriptor_Endpoint_t             Printer_DataOutEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/AudioInput/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2047,
 	.ReleaseNumber          = VERSION_BCD(00.02),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -304,15 +304,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/AudioInput/Descriptors.h

@@ -75,6 +75,17 @@
 			USB_Audio_Descriptor_StreamEndpoint_Spc_t Audio_StreamEndpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/AudioOutput/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2046,
 	.ReleaseNumber          = VERSION_BCD(00.02),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -304,15 +304,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/AudioOutput/Descriptors.h

@@ -75,6 +75,17 @@
 			USB_Audio_Descriptor_StreamEndpoint_Spc_t Audio_StreamEndpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/DualVirtualSerial/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204E,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -352,15 +352,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/DualVirtualSerial/Descriptors.h

@@ -102,6 +102,17 @@
 			USB_Descriptor_Endpoint_t                CDC2_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/GenericHID/Descriptors.c

@@ -75,8 +75,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204F,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -204,15 +204,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/GenericHID/Descriptors.h

@@ -40,7 +40,7 @@
 		#include <avr/pgmspace.h>
 
 		#include <LUFA/Drivers/USB/USB.h>
-		
+
 		#include "Config/AppConfig.h"
 
 	/* Type Defines: */
@@ -58,6 +58,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Generic HID reporting IN endpoint. */
 		#define GENERIC_IN_EPADDR         (ENDPOINT_DIR_IN | 1)

Demos/Device/ClassDriver/Joystick/Descriptors.c

@@ -75,8 +75,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2043,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -204,15 +204,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/Joystick/Descriptors.h

@@ -56,6 +56,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Joystick HID reporting IN endpoint. */
 		#define JOYSTICK_EPADDR              (ENDPOINT_DIR_IN | 1)

Demos/Device/ClassDriver/Keyboard/Descriptors.c

@@ -71,8 +71,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2042,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -200,15 +200,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/Keyboard/Descriptors.h

@@ -56,6 +56,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Keyboard HID reporting IN endpoint. */
 		#define KEYBOARD_EPADDR              (ENDPOINT_DIR_IN | 1)

Demos/Device/ClassDriver/KeyboardMouse/Descriptors.c

@@ -87,8 +87,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204D,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -253,15 +253,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/KeyboardMouse/Descriptors.h

@@ -61,6 +61,17 @@
 			USB_Descriptor_Endpoint_t             HID2_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Keyboard HID reporting IN endpoint. */
 		#define KEYBOARD_IN_EPADDR        (ENDPOINT_DIR_IN | 1)

Demos/Device/ClassDriver/KeyboardMouseMultiReport/Descriptors.c

@@ -134,8 +134,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2066,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -263,15 +263,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/KeyboardMouseMultiReport/Descriptors.h

@@ -56,6 +56,17 @@
 			USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the HID reporting IN endpoint. */
 		#define HID_IN_EPADDR             (ENDPOINT_DIR_IN | 1)

Demos/Device/ClassDriver/MIDI/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2048,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -306,15 +306,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/MIDI/Descriptors.h

@@ -77,6 +77,17 @@
 			USB_MIDI_Descriptor_Jack_Endpoint_t       MIDI_Out_Jack_Endpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/MassStorage/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2045,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -186,15 +186,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/MassStorage/Descriptors.h

@@ -42,7 +42,7 @@
 		#include <LUFA/Drivers/USB/USB.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Macros: */
 		/** Endpoint address of the Mass Storage device-to-host data IN endpoint. */
 		#define MASS_STORAGE_IN_EPADDR         (ENDPOINT_DIR_IN  | 3)
@@ -68,6 +68,17 @@
 			USB_Descriptor_Endpoint_t             MS_DataOutEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/MassStorageKeyboard/Descriptors.c

@@ -73,8 +73,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2061,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -238,15 +238,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/MassStorageKeyboard/Descriptors.h

@@ -43,7 +43,7 @@
 		#include <LUFA/Drivers/USB/USB.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Macros: */
 		/** Endpoint address of the Keyboard HID reporting IN endpoint. */
 		#define KEYBOARD_EPADDR              (ENDPOINT_DIR_IN  | 1)
@@ -80,6 +80,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/Mouse/Descriptors.c

@@ -76,8 +76,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2041,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -205,15 +205,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/Mouse/Descriptors.h

@@ -63,6 +63,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/RNDISEthernet/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204C,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -236,15 +236,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/RNDISEthernet/Descriptors.h

@@ -42,7 +42,7 @@
 		#include <avr/pgmspace.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Macros: */
 		/** Endpoint address of the CDC device-to-host notification IN endpoint. */
 		#define CDC_NOTIFICATION_EPADDR        (ENDPOINT_DIR_IN  | 3)
@@ -81,6 +81,17 @@
 			USB_Descriptor_Endpoint_t             RNDIS_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/VirtualSerial/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2044,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -237,15 +237,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/VirtualSerial/Descriptors.h

@@ -79,6 +79,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/VirtualSerialMassStorage/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2068,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -287,15 +287,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/VirtualSerialMassStorage/Descriptors.h

@@ -96,6 +96,17 @@
 			USB_Descriptor_Endpoint_t                MS_DataOutEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/ClassDriver/VirtualSerialMouse/Descriptors.c

@@ -77,8 +77,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2062,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -307,15 +307,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/ClassDriver/VirtualSerialMouse/Descriptors.h

@@ -91,6 +91,17 @@
 	        USB_Descriptor_Endpoint_t                HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/Incomplete/TestAndMeasurement/Descriptors.c

@@ -59,8 +59,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2065,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -197,15 +197,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/Incomplete/TestAndMeasurement/Descriptors.h

@@ -1,7 +1,7 @@
 /*
              LUFA Library
      Copyright (C) Dean Camera, 2013.
-              
+
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
@@ -10,13 +10,13 @@
   Copyright 2013  Dean Camera (dean [at] fourwalledcubicle [dot] com)
   Copyright 2010  Peter Lawrence (majbthrd [at] gmail [dot] com)
 
-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in
   all copies and that both that the copyright notice and this
-  permission notice and warranty disclaimer appear in supporting 
+  permission notice and warranty disclaimer appear in supporting
-  documentation, and that the name of the author not be used in 
+  documentation, and that the name of the author not be used in
-  advertising or publicity pertaining to distribution of the 
+  advertising or publicity pertaining to distribution of the
   software without specific, written prior permission.
 
   The author disclaims all warranties with regard to this
@@ -33,7 +33,7 @@
  *
  *  Header file for Descriptors.c.
  */
- 
+
 #ifndef _DESCRIPTORS_H_
 #define _DESCRIPTORS_H_
 
@@ -66,7 +66,7 @@
 		typedef struct
 		{
 			USB_Descriptor_Configuration_Header_t Config;
-			
+
 			// Test and Measurement Interface
 			USB_Descriptor_Interface_t            TM_Interface;
 			USB_Descriptor_Endpoint_t             TM_DataOutEndpoint;
@@ -74,6 +74,17 @@
 			USB_Descriptor_Endpoint_t             TM_NotificationEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/AudioInput/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2047,
 	.ReleaseNumber          = VERSION_BCD(00.02),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -304,15 +304,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/AudioInput/Descriptors.h

@@ -42,7 +42,7 @@
 		#include <avr/pgmspace.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Macros: */
 		/** Endpoint address of the Audio isochronous streaming data IN endpoint. */
 		#define AUDIO_STREAM_EPADDR          (ENDPOINT_DIR_IN | 1)
@@ -75,6 +75,17 @@
 			USB_Audio_Descriptor_StreamEndpoint_Spc_t Audio_StreamEndpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/AudioOutput/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2046,
 	.ReleaseNumber          = VERSION_BCD(00.02),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -304,15 +304,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/AudioOutput/Descriptors.h

@@ -75,6 +75,17 @@
 			USB_Audio_Descriptor_StreamEndpoint_Spc_t Audio_StreamEndpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/DualVirtualSerial/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204E,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -352,15 +352,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/DualVirtualSerial/Descriptors.h

@@ -102,6 +102,17 @@
 			USB_Descriptor_Endpoint_t                CDC2_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/GenericHID/Descriptors.c

@@ -83,8 +83,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204F,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -222,15 +222,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/GenericHID/Descriptors.h

@@ -42,7 +42,7 @@
 		#include <avr/pgmspace.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Type Defines: */
 		/** Type define for the device configuration descriptor structure. This must be defined in the
 		 *  application code, as the configuration descriptor contains several sub-descriptors which
@@ -59,6 +59,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportOUTEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Generic HID reporting IN endpoint. */
 		#define GENERIC_IN_EPADDR         (ENDPOINT_DIR_IN  | 1)

Demos/Device/LowLevel/Joystick/Descriptors.c

@@ -95,8 +95,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2043,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -224,15 +224,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/Joystick/Descriptors.h

@@ -56,6 +56,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Joystick HID reporting IN endpoint. */
 		#define JOYSTICK_EPADDR           (ENDPOINT_DIR_IN | 1)

Demos/Device/LowLevel/Keyboard/Descriptors.c

@@ -100,8 +100,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2042,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -239,15 +239,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/Keyboard/Descriptors.h

@@ -58,6 +58,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportOUTEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Keyboard HID reporting IN endpoint. */
 		#define KEYBOARD_IN_EPADDR        (ENDPOINT_DIR_IN  | 1)

Demos/Device/LowLevel/KeyboardMouse/Descriptors.c

@@ -135,8 +135,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204D,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -311,15 +311,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/KeyboardMouse/Descriptors.h

@@ -63,6 +63,17 @@
 			USB_Descriptor_Endpoint_t             HID2_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Keyboard HID reporting IN endpoint. */
 		#define KEYBOARD_IN_EPADDR        (ENDPOINT_DIR_IN  | 1)

Demos/Device/LowLevel/MIDI/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2048,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -306,15 +306,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/MIDI/Descriptors.h

@@ -77,6 +77,17 @@
 			USB_MIDI_Descriptor_Jack_Endpoint_t       MIDI_Out_Jack_Endpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/MassStorage/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2045,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -186,15 +186,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/MassStorage/Descriptors.h

@@ -68,6 +68,17 @@
 			USB_Descriptor_Endpoint_t             MS_DataOutEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/Mouse/Descriptors.c

@@ -95,8 +95,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2041,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -224,15 +224,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/Mouse/Descriptors.h

@@ -63,6 +63,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/RNDISEthernet/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204C,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -236,15 +236,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/RNDISEthernet/Descriptors.h

@@ -81,6 +81,17 @@
 			USB_Descriptor_Endpoint_t             RNDIS_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/Device/LowLevel/VirtualSerial/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2044,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -237,15 +237,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/Device/LowLevel/VirtualSerial/Descriptors.h

@@ -79,6 +79,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Demos/DualRole/ClassDriver/MouseHostDevice/Descriptors.c

@@ -76,8 +76,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2041,
 	.ReleaseNumber          = 0x0000,
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -205,15 +205,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Demos/DualRole/ClassDriver/MouseHostDevice/Descriptors.h

@@ -56,6 +56,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Mouse HID reporting IN endpoint. */
 		#define MOUSE_EPADDR              (ENDPOINT_DIR_IN | 1)

Projects/AVRISP-MKII/AVRISPDescriptors.c

@@ -43,7 +43,7 @@
 
 	/** Current AVRISP data IN endpoint address. */
 	uint8_t AVRISP_CurrDataINEndpointAddress;
-	
+
 	/** Saved AVRISP data IN endpoint address in EEPROM. */
 	uint8_t AVRISP_CurrDataINEndpointAddress_EEPROM EEMEM;
 #endif
@@ -68,9 +68,9 @@ const USB_Descriptor_Device_t PROGMEM AVRISP_DeviceDescriptor =
 	.ProductID              = 0x2104,
 	.ReleaseNumber          = VERSION_BCD(02.00),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
-	.SerialNumStrIndex      = 0x03,
+	.SerialNumStrIndex      = STRING_ID_Serial,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
 };
@@ -177,7 +177,7 @@ const USB_Descriptor_String_t PROGMEM AVRISP_ProductString =
 USB_Descriptor_String_t AVRISP_SerialString =
 {
 	.Header                 = {.Size = USB_STRING_LEN(13), .Type = DTYPE_String},
-	
+
 	.UnicodeString          = L"000200012345\0" // Note: Real AVRISP-MKII has the embedded NUL byte, bug in firmware?
 };
 
@@ -199,7 +199,7 @@ uint16_t AVRISP_GetDescriptor(const uint16_t wValue,
 	uint16_t    Size    = NO_DESCRIPTOR;
 
 	*DescriptorMemorySpace = MEMSPACE_FLASH;
-	
+
 	switch (DescriptorType)
 	{
 		case DTYPE_Device:
@@ -219,25 +219,25 @@ uint16_t AVRISP_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &AVRISP_LanguageString;
 					Size    = pgm_read_byte(&AVRISP_LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &AVRISP_ManufacturerString;
 					Size    = pgm_read_byte(&AVRISP_ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &AVRISP_ProductString;
 					Size    = pgm_read_byte(&AVRISP_ProductString.Header.Size);
 					break;
-				case 0x03:
+				case STRING_ID_Serial:
 					Address = &AVRISP_SerialString;
 					Size    = AVRISP_SerialString.Header.Size;
-					
+
 					/* Update serial number to have a different serial based on the current endpoint address */
 					((uint16_t*)&AVRISP_SerialString.UnicodeString)[6] = cpu_to_le16('0' + (AVRISP_DATA_IN_EPADDR & ENDPOINT_EPNUM_MASK));
-					
+
 					*DescriptorMemorySpace = MEMSPACE_RAM;
 					break;
 			}
@@ -259,7 +259,7 @@ uint16_t AVRISP_GetDescriptor(const uint16_t wValue,
  *  change.
  */
 void CheckExternalReset(void)
-{	
+{
 	/* If an external reset occurred, we need to change compatibility mode */
 	AVRISP_NeedCompatibilitySwitch = (MCUSR == (1 << EXTRF));
 
@@ -277,7 +277,7 @@ void UpdateCurrentCompatibilityMode(void)
 {
 	/* Load the current IN endpoint address stored in EEPROM */
 	AVRISP_CurrDataINEndpointAddress = eeprom_read_byte(&AVRISP_CurrDataINEndpointAddress_EEPROM);
-	
+
 	/* Check if we need to switch compatibility modes */
 	if (AVRISP_NeedCompatibilitySwitch)
 	{
@@ -303,7 +303,7 @@ void UpdateCurrentCompatibilityMode(void)
 			{
 				LEDs_ToggleLEDs(LEDS_ALL_LEDS);
 				Delay_MS(100);
-			}		
+			}
 			break;
 		case AVRISP_DATA_IN_EPADDR_LIBUSB:
 			/* Five flashes for libUSB compatibility mode */
@@ -314,7 +314,7 @@ void UpdateCurrentCompatibilityMode(void)
 			}
 			break;
 	}
-	
+
 	Delay_MS(500);
 }
 #endif

Projects/AVRISP-MKII/AVRISPDescriptors.h

@@ -41,7 +41,7 @@
 
 		#include <LUFA/Drivers/USB/USB.h>
 		#include <LUFA/Drivers/Board/LEDs.h>
-		
+
 		#include "Config/AppConfig.h"
 
 	/* Preprocessor Checks: */
@@ -67,7 +67,7 @@
 			/** Endpoint address of the AVRISP data IN endpoint. */
 			#define AVRISP_DATA_IN_EPADDR      AVRISP_DATA_IN_EPADDR_JUNGO
 		#endif
-		
+
 		/** Size in bytes of the AVRISP data endpoint. */
 		#define AVRISP_DATA_EPSIZE             64
 
@@ -86,11 +86,23 @@
 			USB_Descriptor_Endpoint_t                AVRISP_DataOutEndpoint;
 		} AVRISP_USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		    STRING_ID_Serial        = 3, /**< Serial number string ID */
+		};
+
 	/* External Variables: */
 		#if defined(RESET_TOGGLES_LIBUSB_COMPAT)
 			extern uint8_t AVRISP_CurrDataINEndpointAddress;
 		#endif
-		
+
 	/* Function Prototypes: */
 		uint16_t AVRISP_GetDescriptor(const uint16_t wValue,
 		                              const uint8_t wIndex,

Projects/Benito/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2060,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -236,15 +236,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/Benito/Descriptors.h

@@ -81,6 +81,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/LEDNotifier/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2044,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -237,15 +237,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/LEDNotifier/Descriptors.h

@@ -79,6 +79,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/MIDIToneGenerator/Descriptors.c

@@ -57,8 +57,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2048,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -306,15 +306,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/MIDIToneGenerator/Descriptors.h

@@ -79,6 +79,17 @@
 			USB_MIDI_Descriptor_Jack_Endpoint_t       MIDI_Out_Jack_Endpoint_SPC;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/Magstripe/Descriptors.c

@@ -72,8 +72,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2042,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -200,15 +200,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/Magstripe/Descriptors.h

@@ -59,6 +59,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint; /**< Keyboard key report endpoint descriptor */
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the keyboard key press reporting endpoint. */
 		#define KEYBOARD_EPADDR              (ENDPOINT_DIR_IN | 1)

Projects/MediaController/Descriptors.c

@@ -89,8 +89,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x206A,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = NO_DESCRIPTOR,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -218,15 +218,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/MediaController/Descriptors.h

@@ -56,6 +56,17 @@
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Macros: */
 		/** Endpoint address of the Media Control HID reporting IN endpoint. */
 		#define MEDIACONTROL_HID_EPADDR           (ENDPOINT_DIR_IN | 1)

Projects/RelayBoard/Descriptors.c

@@ -58,9 +58,9 @@ const USB_Descriptor_Device_t PROGMEM RelayBoard_DeviceDescriptor =
 	.ProductID              = 0xFD11,
 	.ReleaseNumber          = VERSION_BCD(02.00),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
-	.SerialNumStrIndex      = 0x03,
+	.SerialNumStrIndex      = STRING_ID_Serial,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
 };
@@ -176,19 +176,19 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &RelayBoard_LanguageString;
 					Size    = pgm_read_byte(&RelayBoard_LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &RelayBoard_ManufacturerString;
 					Size    = pgm_read_byte(&RelayBoard_ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &RelayBoard_ProductString;
 					Size    = pgm_read_byte(&RelayBoard_ProductString.Header.Size);
 					break;
-				case 0x03:
+				case STRING_ID_Serial:
 					Address = &RelayBoard_SerialString;
 					Size    = pgm_read_byte(&RelayBoard_SerialString.Header.Size);
 					break;

Projects/RelayBoard/Descriptors.h

@@ -54,6 +54,18 @@
 			USB_Descriptor_Interface_t            RelayBoardInterface;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		    STRING_ID_Serial        = 3, /**< Serial number string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/SerialToLCD/Descriptors.c

@@ -70,8 +70,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204B,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -249,15 +249,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/SerialToLCD/Descriptors.h

@@ -80,6 +80,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/TempDataLogger/Descriptors.c

@@ -76,8 +76,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2063,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -241,15 +241,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/TempDataLogger/Descriptors.h

@@ -56,6 +56,17 @@
 			USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/USBtoSerial/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x204B,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -237,15 +237,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/USBtoSerial/Descriptors.h

@@ -79,6 +79,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/Webserver/Descriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 	.ProductID              = 0x2069,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -287,15 +287,15 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &LanguageString;
 					Size    = pgm_read_byte(&LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &ManufacturerString;
 					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &ProductString;
 					Size    = pgm_read_byte(&ProductString.Header.Size);
 					break;

Projects/Webserver/Descriptors.h

@@ -42,7 +42,7 @@
 		#include <LUFA/Drivers/USB/USB.h>
 
 		#include "Config/AppConfig.h"
-		
+
 	/* Macros: */
 		/** Endpoint address of the Mass Storage device-to-host data IN endpoint. */
 		#define MASS_STORAGE_IN_EPADDR         (ENDPOINT_DIR_IN  | 3)
@@ -96,6 +96,17 @@
 			USB_Descriptor_Endpoint_t              MS_DataOutEndpoint;
 		} USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 		                                    const uint8_t wIndex,

Projects/XPLAINBridge/USARTDescriptors.c

@@ -58,8 +58,8 @@ const USB_Descriptor_Device_t PROGMEM USART_DeviceDescriptor =
 	.ProductID              = 0x204B,
 	.ReleaseNumber          = VERSION_BCD(00.01),
 
-	.ManufacturerStrIndex   = 0x01,
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
-	.ProductStrIndex        = 0x02,
+	.ProductStrIndex        = STRING_ID_Product,
 	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
 
 	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
@@ -223,7 +223,7 @@ uint16_t USART_GetDescriptor(const uint16_t wValue,
 	uint16_t    Size    = NO_DESCRIPTOR;
 
 	*DescriptorMemorySpace = MEMSPACE_FLASH;
-	
+
 	switch (DescriptorType)
 	{
 		case DTYPE_Device:
@@ -237,15 +237,15 @@ uint16_t USART_GetDescriptor(const uint16_t wValue,
 		case DTYPE_String:
 			switch (DescriptorNumber)
 			{
-				case 0x00:
+				case STRING_ID_Language:
 					Address = &USART_LanguageString;
 					Size    = pgm_read_byte(&USART_LanguageString.Header.Size);
 					break;
-				case 0x01:
+				case STRING_ID_Manufacturer:
 					Address = &USART_ManufacturerString;
 					Size    = pgm_read_byte(&USART_ManufacturerString.Header.Size);
 					break;
-				case 0x02:
+				case STRING_ID_Product:
 					Address = &USART_ProductString;
 					Size    = pgm_read_byte(&USART_ProductString.Header.Size);
 					break;

Projects/XPLAINBridge/USARTDescriptors.h

@@ -81,6 +81,17 @@
 			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
 		} USART_USB_Descriptor_Configuration_t;
 
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+		    STRING_ID_Language      = 0, /**< Supported Languages string descriptor ID (must be zero) */
+		    STRING_ID_Manufacturer  = 1, /**< Manufacturer string ID */
+		    STRING_ID_Product       = 2, /**< Product string ID */
+		};
+
 	/* Function Prototypes: */
 		uint16_t USART_GetDescriptor(const uint16_t wValue,
 		                             const uint8_t wIndex,