Add new ARCH option to the makefiles to (eventually) specify the target device architecture. Update non-usb peripheral drivers to reflect future multiple architecture support.

LUFA/Common/Architectures.h

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+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2011.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  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
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaim all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *  \brief Supported architecture defines.
+ *
+ *  This file contains constants which can be passed to the compiler (via setting the macro ARCH) in the
+ *  user project makefile using the -D option to configure the library drivers.
+ *
+ *  \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
+ *        functionality.
+ */
+
+/** \ingroup Group_Common
+ *  \defgroup Group_Architectures Hardware Architectures
+ *
+ *  Macros for indicating the chosen hardware architecture to the library. These macros should be used when
+ *  defining the ARCH token to the chosen hardware via the -D switch in the project makefile.
+ *
+ *  @{
+ */
+
+#ifndef __LUFA_ARCHITECTURES_H__
+#define __LUFA_ARCHITECTURES_H__
+
+	/* Preprocessor Checks: */
+		#if !defined(__INCLUDE_FROM_COMMON_H)
+			#error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
+		#endif
+
+	/* Public Interface - May be used in end-application: */
+		/* Macros: */
+			/** Selects the Atmel 8-bit AVR (AT90USB* and ATMEGA*U* chips) architecture. */
+			#define ARCH_AVR8           1
+
+			#if !defined(__DOXYGEN__)
+				#define ARCH_           ARCH_AVR8
+
+				#if !defined(ARCH)
+					#define ARCH        ARCH_AVR8
+				#endif
+			#endif
+
+#endif
+
+/** @} */
+