Add experimental support for the UC3A0, UC3A1 and UC3A3 series AVR32 microcontrollers.

LUFA/Common/Common.h

@@ -214,6 +214,12 @@
 			 */
 			#define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
 
+			/** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.
+			 *  This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting
+			 *  assembly output in an unexpected manner on sections of code that are ordering-specific.
+			 */
+			#define GCC_MEMORY_BARRIER()                __asm__ __volatile__("" ::: "memory");
+
 		/* Inline Functions: */
 			/** Function to reverse the individual bits in a byte - i.e. bit 7 is moved to bit 0, bit 6 to bit 1,
 			 *  etc.

LUFA/Drivers/USB/Core/StdDescriptors.h

@@ -76,17 +76,24 @@
 			 */
 			#define NO_DESCRIPTOR                     0
 
-			/** Macro to calculate the power value for the configuration descriptor, from a given number of milliamperes. */
+			/** Macro to calculate the power value for the configuration descriptor, from a given number of milliamperes.
+			 *
+			 *  \param[in] mA  Maximum number of milliamps the device consumes when the given configuration is selected.
+			 */
 			#define USB_CONFIG_POWER_MA(mA)           ((mA) >> 1)
 
 			/** Macro to calculate the Unicode length of a string with a given number of Unicode characters.
 			 *  Should be used in string descriptor's headers for giving the string descriptor's byte length.
+			 *
+			 *  \param[in] UnicodeChars  Number of Unicode characters in the string text.
 			 */
-			#define USB_STRING_LEN(str)               (sizeof(USB_Descriptor_Header_t) + ((str) << 1))
+			#define USB_STRING_LEN(UnicodeChars)      (sizeof(USB_Descriptor_Header_t) + ((UnicodeChars) << 1))
 
 			/** Macro to encode a given four digit floating point version number (e.g. 01.23) into Binary Coded
 			 *  Decimal format for descriptor fields requiring BCD encoding, such as the USB version number in the
 			 *  standard device descriptor.
+			 *
+			 *  \param[in]  x  Version number to encode as a 16-bit little-endian number, as a floating point number.
 			 */
 			#define VERSION_BCD(x)                    CPU_TO_LE16((((VERSION_TENS(x) << 4) | VERSION_ONES(x)) << 8) | \
 			                                          ((VERSION_TENTHS(x) << 4) | VERSION_HUNDREDTHS(x)))

LUFA/Drivers/USB/Core/UC3B/USBController_UC3B.c

@@ -104,11 +104,11 @@ void USB_ResetInterface(void)
 	bool UIDModeSelectEnabled = AVR32_USBB.USBCON.uide;
 	#endif
 
-	AVR32_PM.GCCTRL[USB_GCLK_USBB_INDEX].pllsel = !(USB_Options & USB_OPT_GCLK_SRC_OSC);
-	AVR32_PM.GCCTRL[USB_GCLK_USBB_INDEX].oscsel = !(USB_Options & USB_OPT_GCLK_CHANNEL_0);
-	AVR32_PM.GCCTRL[USB_GCLK_USBB_INDEX].diven  = (F_CLOCK != 48000000UL);
-	AVR32_PM.GCCTRL[USB_GCLK_USBB_INDEX].div    = (F_CLOCK == 48000000UL) ? 0 : (uint32_t)(((F_CLOCK / 48000000UL) - 1) / 2);
-	AVR32_PM.GCCTRL[USB_GCLK_USBB_INDEX].cen    = true;
+	AVR32_PM.GCCTRL[AVR32_PM_GCLK_USBB].pllsel = !(USB_Options & USB_OPT_GCLK_SRC_OSC);
+	AVR32_PM.GCCTRL[AVR32_PM_GCLK_USBB].oscsel = !(USB_Options & USB_OPT_GCLK_CHANNEL_0);
+	AVR32_PM.GCCTRL[AVR32_PM_GCLK_USBB].diven  = (F_CLOCK != USB_CLOCK_REQUIRED_FREQ);
+	AVR32_PM.GCCTRL[AVR32_PM_GCLK_USBB].div    = (F_CLOCK == USB_CLOCK_REQUIRED_FREQ) ? 0 : (uint32_t)(((F_CLOCK / USB_CLOCK_REQUIRED_FREQ) - 1) / 2);
+	AVR32_PM.GCCTRL[AVR32_PM_GCLK_USBB].cen    = true;
 
 	USB_INT_DisableAllInterrupts();
 	USB_INT_ClearAllInterrupts();

LUFA/Drivers/USB/Core/UC3B/USBController_UC3B.h

@@ -293,8 +293,12 @@
 
 	/* Private Interface - For use in library only: */
 	#if !defined(__DOXYGEN__)
-		/* Macros: */
-			#define USB_GCLK_USBB_INDEX          3
+		/* Macros: */			
+			#if defined(USB_SERIES_UC3A3_AVR)
+				#define USB_CLOCK_REQUIRED_FREQ  12000000UL
+			#else
+				#define USB_CLOCK_REQUIRED_FREQ  48000000UL
+			#endif
 	
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_USB_CONTROLLER_C)

LUFA/Drivers/USB/Core/USBMode.h

@@ -62,30 +62,50 @@
 
 	/* Public Interface - May be used in end-application: */
 	#if defined(__DOXYGEN__)
-		/** Indicates that the target AVR microcontroller belongs to the Series 2 USB controller
+		/** Indicates that the target AVR microcontroller belongs to the Series 2 AVR8 USB controller
 		 *  (i.e. AT90USBxxx2 or ATMEGAxxU2) when defined.
 		 */
 		#define USB_SERIES_2_AVR
 
-		/** Indicates that the target AVR microcontroller belongs to the Series 4 USB controller
+		/** Indicates that the target AVR microcontroller belongs to the Series 4 AVR8 USB controller
 		 *  (i.e. ATMEGAxxU4) when defined.
 		 */
 		#define USB_SERIES_4_AVR
 
-		/** Indicates that the target AVR microcontroller belongs to the Series 6 USB controller
+		/** Indicates that the target AVR microcontroller belongs to the Series 6 AVR8 USB controller
 		 *  (i.e. AT90USBxxx6) when defined.
 		 */
 		#define USB_SERIES_6_AVR
 
-		/** Indicates that the target AVR microcontroller belongs to the Series 7 USB controller
+		/** Indicates that the target AVR microcontroller belongs to the Series 7 AVR8 USB controller
 		 *  (i.e. AT90USBxxx7) when defined.
 		 */
 		#define USB_SERIES_7_AVR
 
-		/** Indicates that the target AVR microcontroller belongs to the UC3B Series USB controller
-		 *  (i.e. AT32UC3B*) when defined.
+		/** Indicates that the target AVR microcontroller belongs to the AVR32 UC3A0 Series USB controller
+		 *  (i.e. AT32UC3A0*) when defined.
 		 */
-		#define USB_SERIES_UC3B_AVR
+		#define USB_SERIES_UC3A0_AVR
+		
+		/** Indicates that the target AVR microcontroller belongs to the AVR32 UC3A1 Series USB controller
+		 *  (i.e. AT32UC3A1*) when defined.
+		 */
+		#define USB_SERIES_UC3A1_AVR
+
+		/** Indicates that the target AVR microcontroller belongs to the AVR32 UC3A3 Series USB controller
+		 *  (i.e. AT32UC3A3*) when defined.
+		 */
+		#define USB_SERIES_UC3A3_AVR
+
+		/** Indicates that the target AVR microcontroller belongs to the AVR32 UC3B0 Series USB controller
+		 *  (i.e. AT32UC3B0*) when defined.
+		 */
+		#define USB_SERIES_UC3B0_AVR
+
+		/** Indicates that the target AVR microcontroller belongs to the AVR32 UC3B1 Series USB controller
+		 *  (i.e. AT32UC3B1*) when defined.
+		 */
+		#define USB_SERIES_UC3B1_AVR
 
 		/** Indicates that the target microcontroller and compilation settings allow for the
 		 *  target to be configured in USB Device mode when defined.
@@ -117,11 +137,30 @@
 				#define USB_SERIES_7_AVR
 				#define USB_CAN_BE_DEVICE
 				#define USB_CAN_BE_HOST
-			#elif (defined(__AVR32_UC3B0512__) || defined(__AVR32_UC3B1512__) || \
-			       defined(__AVR32_UC3B0256__) || defined(__AVR32_UC3B1256__) || \
-			       defined(__AVR32_UC3B0128__) || defined(__AVR32_UC3B1128__) || \
-			       defined(__AVR32_UC3B064__) || defined(__AVR32_UC3B164__))
-				#define USB_SERIES_UC3B_AVR
+			#elif (defined(__AVR32_UC3A0512__) || defined(__AVR32_UC3A0256__) || \
+			       defined(__AVR32_UC3A0128__) || defined(__AVR32_UC3A064__))
+				#define USB_SERIES_UC3A0_AVR
+				#define USB_CAN_BE_DEVICE
+				#define USB_CAN_BE_HOST
+			#elif (defined(__AVR32_UC3A1512__) || defined(__AVR32_UC3A1256__) || \
+			       defined(__AVR32_UC3A1128__) || defined(__AVR32_UC3A164__))
+				#define USB_SERIES_UC3A1_AVR
+				#define USB_CAN_BE_DEVICE
+				#define USB_CAN_BE_HOST
+			#elif (defined(__AVR32_UC3A3256__) || defined(__AVR32_UC3A3256S__) || \
+			       defined(__AVR32_UC3A3128__) || defined(__AVR32_UC3A3128S__) || \
+			       defined(__AVR32_UC3A364__)  || defined(__AVR32_UC3A364S__))
+				#define USB_SERIES_UC3A3_AVR
+				#define USB_CAN_BE_DEVICE
+				#define USB_CAN_BE_HOST
+			#elif (defined(__AVR32_UC3B0512__) || defined(__AVR32_UC3B0256__) || \
+			       defined(__AVR32_UC3B0128__) || defined(__AVR32_UC3B064__))
+				#define USB_SERIES_UC3B0_AVR
+				#define USB_CAN_BE_DEVICE
+				#define USB_CAN_BE_HOST
+			#elif (defined(__AVR32_UC3B1512__) || defined(__AVR32_UC3B1256__) || \
+			       defined(__AVR32_UC3B1128__) || defined(__AVR32_UC3B164__))
+				#define USB_SERIES_UC3B1_AVR
 				#define USB_CAN_BE_DEVICE
 				#define USB_CAN_BE_HOST
 			#endif
@@ -153,7 +192,7 @@
 			#endif
 
 			#if (!defined(USB_CAN_BE_DEVICE) && !defined(USB_CAN_BE_HOST))
-				#error The currently selected architecture is not supported under the USB component of the library.
+				#error The currently selected device or architecture is not supported under the USB component of the library.
 			#endif
 	#endif