Add stub functions to all board drivers, so that demos can be compiled with BOARD=NONE.

LUFA/DoxygenPages/ChangeLog.txt

@@ -15,11 +15,13 @@
   *  - Library Applications:
   *   - Added new Printer class bootloader
   *   - Added new Mass Storage class bootloader
+  *   - Added XMEGA support for class driver device demos (where applicable)
   *
   *  <b>Changed:</b>
   *  - Core:
   *   - Updated the BUILD build system module to produce binary BIN files in addition to Intel HEX files
   *   - Updated the Android Accessory Class to accept version 2 protocol devices (with version 1 functionality)
+  *   - All board drivers now implement dummy functions and constants when BOARD is set to NONE
   *
   *  <b>Fixed:</b>
   *  - Core:

LUFA/Drivers/Board/Buttons.h

@@ -92,7 +92,9 @@
 		#include "../../Common/Common.h"
 
 		#if (BOARD == BOARD_NONE)
-			#error The Board Buttons driver cannot be used if the makefile BOARD option is not set.
+			#define BUTTONS_BUTTON1  0
+			static inline void       Buttons_Init(void) {};
+			static inline uint_reg_t Buttons_GetStatus(void) { return 0; };
 		#elif (BOARD == BOARD_USBKEY)
 			#include "AVR8/USBKEY/Buttons.h"
 		#elif (BOARD == BOARD_STK525)

LUFA/Drivers/Board/Dataflash.h

@@ -220,7 +220,23 @@
 
 		/* Includes: */
 			#if (BOARD == BOARD_NONE)
-				#error The Board Dataflash driver cannot be used if the makefile BOARD option is not set.
+				#define DATAFLASH_TOTALCHIPS  0
+				#define DATAFLASH_NO_CHIP     0
+				#define DATAFLASH_CHIP1       0
+				#define DATAFLASH_PAGE_SIZE   0
+				#define DATAFLASH_PAGES       0
+				static inline void    Dataflash_Init(void) {};
+				static inline uint8_t Dataflash_TransferByte(const uint8_t Byte) { return 0; };
+				static inline void    Dataflash_SendByte(const uint8_t Byte) {};
+				static inline uint8_t Dataflash_ReceiveByte(void) { return 0; };
+				static inline uint8_t Dataflash_GetSelectedChip(void) { return 0; };
+				static inline void    Dataflash_SelectChip(const uint8_t ChipMask) {};
+				static inline void    Dataflash_DeselectChip(void) {};
+				static inline void    Dataflash_SelectChipFromPage(const uint16_t PageAddress) {};
+				static inline void    Dataflash_ToggleSelectedChipCS(void) {};
+				static inline void    Dataflash_WaitWhileBusy(void) {};
+				static inline void    Dataflash_SendAddressBytes(uint16_t PageAddress,
+				                                                 const uint16_t BufferByte) {};
 			#elif (BOARD == BOARD_USBKEY)
 				#include "AVR8/USBKEY/Dataflash.h"
 			#elif (BOARD == BOARD_STK525)

LUFA/Drivers/Board/Joystick.h

@@ -100,7 +100,13 @@
 		#include "../../Common/Common.h"
 
 		#if (BOARD == BOARD_NONE)
-			#error The Board Joystick driver cannot be used if the makefile BOARD option is not set.
+			#define JOY_UP           0
+			#define JOY_DOWN         0
+			#define JOY_LEFT         0
+			#define JOY_RIGHT        0
+			#define JOY_PRESS        0
+			static inline void       Joystick_Init(void) {};
+			static inline uint_reg_t Joystick_GetStatus(void) { return 0; };
 		#elif (BOARD == BOARD_USBKEY)
 			#include "AVR8/USBKEY/Joystick.h"
 		#elif (BOARD == BOARD_STK525)