+++ /dev/null
-/*!
- * \file
- * <!--
- * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- * This file is part of DevLib - See devlib/README for information.
- * -->
- *
- * \brief Common and handy function macros
- *
- * \version $Id$
- * \author Bernardo Innocenti <bernie@develer.com>
- * \author Giovanni Bajo <rasky@develer.com>
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.3 2005/06/27 21:23:32 bernie
- *#* ROUND_DOWN, ROUND_UP, ROUND_NEAREST: New macros.
- *#*
- *#* Revision 1.2 2005/04/11 19:10:27 bernie
- *#* Include top-level headers from cfg/ subdir.
- *#*
- *#* Revision 1.1 2005/04/11 19:04:13 bernie
- *#* Move top-level headers to cfg/ subdir.
- *#*
- *#* Revision 1.10 2005/01/22 04:19:50 bernie
- *#* Use non-uglified typeof().
- *#*
- *#* Revision 1.9 2004/12/08 08:51:34 bernie
- *#* Add type-generic macros for C++.
- *#*
- *#* Revision 1.8 2004/10/19 07:14:20 bernie
- *#* Add macros to test for specific compiler features.
- *#*
- *#* Revision 1.7 2004/09/20 03:30:45 bernie
- *#* C++ also has variadic macros.
- *#*
- *#* Revision 1.6 2004/09/14 21:02:04 bernie
- *#* SWAP(), MINMAX(): New macros.
- *#*
- *#* Revision 1.5 2004/08/29 21:57:58 bernie
- *#* Move back STATIC_ASSERT() to compiler.h as it's needed in cpu.h;
- *#* iptr_t, const_iptr_t: Replace IPTR macro with a real typedef.
- *#*
- *#* Revision 1.3 2004/08/24 14:13:48 bernie
- *#* Restore a few macros that were lost in the way.
- *#*
- *#* Revision 1.2 2004/08/24 13:32:14 bernie
- *#* PP_CAT(), PP_STRINGIZE(): Move back to compiler.h to break circular dependency between cpu.h/compiler.h/macros.h;
- *#* offsetof(), countof(): Move back to compiler.h to avoid including macros.h almost everywhere;
- *#* Trim CVS log;
- *#* Rename header guards;
- *#* Don't include arch_config.h in compiler.h as it's not needed there.
- *#*
- *#* Revision 1.1 2004/08/14 19:37:57 rasky
- *#* Merge da SC: macros.h, pool.h, BIT_CHANGE, nome dei processi, etc.
- *#*
- *#* Revision 1.4 2004/08/14 18:36:50 rasky
- *#* Doxygen fix e un livello di parentesi aggiuntivi per la macro
- *#*
- *#* Revision 1.3 2004/08/12 20:01:32 rasky
- *#* Aggiunte macro BIT_CHANGE e BIT_CHANGE_BV
- *#*
- *#* Revision 1.2 2004/08/10 21:36:14 rasky
- *#* Aggiunto include macros.h dove serve
- *#* Aggiunta dipendenza da compiler.h in macros.h
- *#*
- *#* Revision 1.1 2004/08/10 21:30:00 rasky
- *#* Estratte le funzioni macro in macros.h
- *#*
- *#*/
-
-#ifndef MACROS_H
-#define MACROS_H
-
-#include <cfg/compiler.h>
-
-/* avr-gcc does not seem to support libstdc++ */
-#if defined(__cplusplus) && !CPU_AVR
- /* Type-generic macros implemented with template functions. */
- #include <algorithm>
-
- template<class T> inline T ABS(T n) { return n >= 0 ? n : -n; }
- #define MIN(a,b) std::min(a, b)
- #define MAX(a,b) std::max(a, b)
- #define SWAP(a,b) std::swap(a, b)
-#elif (COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF)
- /* Type-generic macros implemented with statement expressions. */
- #define ABS(n) ({ \
- typeof(n) _n = (n); \
- (_n < 0) ? -_n : _n; \
- })
- #define MIN(a,b) ({ \
- typeof(a) _a = (a); \
- typeof(b) _b = (b); \
- (void)(&_a == &_b); /* ensure same type */ \
- (_a < _b) ? _a : _b; \
- })
- #define MAX(a,b) ({ \
- typeof(a) _a = (a); \
- typeof(b) _b = (b); \
- (void)(&_a == &_b); /* ensure same type */ \
- (_a > _b) ? _a : _b; \
- })
-#else /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */
- /* Buggy macros for inferior compilers. */
- #define ABS(a) (((a) < 0) ? -(a) : (a))
- #define MIN(a,b) (((a) < (b)) ? (a) : (b))
- #define MAX(a,b) (((a) > (b)) ? (a) : (b))
-#endif /* !(COMPILER_STATEMENT_EXPRESSIONS && COMPILER_TYPEOF) */
-
-/*! Bound \a x between \a min and \a max. */
-#define MINMAX(min,x,max) (MIN(MAX(min, x), max))
-
-#ifdef __cplusplus
- /* Use standard implementation from <algorithm> */
- #define SWAP(a,b) std::swap(a, b)
-#elif COMPILER_TYPEOF
- /*!
- * Type-generic macro to swap \a a with \a b.
- *
- * \note Arguments are evaluated multiple times.
- */
- #define SWAP(a, b) \
- do { \
- (void)(&(a) == &(b)); /* type check */ \
- typeof(a) tmp; \
- tmp = (a); \
- (a) = (b); \
- (b) = tmp; \
- } while (0)
-#else /* !COMPILER_TYPEOF */
- /* Sub-optimal implementation that only works with integral types. */
- #define SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b))
-#endif /* COMPILER_TYPEOF */
-
-#ifndef BV
- /*! Convert a bit value to a binary flag. */
- #define BV(x) (1<<(x))
-#endif
-
-/*! Round up \a x to an even multiple of the 2's power \a pad */
-#define ROUND2(x, pad) (((x) + ((pad) - 1)) & ~((pad) - 1))
-
-/*!
- * Integer round macros.
- * Round \a x to a multiple of \a base.
- * \note If \a x is signed these macros generate a lot of code.
- * \{
- */
-#define ROUND_DOWN(x, base) ( (x) - ((x) % (base)) )
-#define ROUND_UP(x, base) ( ((x) + (base) - 1) - (((x) + (base) - 1) % (base)) )
-#define ROUND_NEAREST(x, base) ( ((x) + (base) / 2) - (((x) + (base) / 2) % (base)) )
-/* \} */
-
-//! Check if \a x is an integer power of 2
-#define IS_POW2(x) (!(bool)((x) & ((x)-1)))
-
-/*! Calculate a compile-time log2 for a uint8_t */
-#define UINT8_LOG2(x) \
- ((x) < 2 ? 0 : \
- ((x) < 4 ? 1 : \
- ((x) < 8 ? 2 : \
- ((x) < 16 ? 3 : \
- ((x) < 32 ? 4 : \
- ((x) < 64 ? 5 : \
- ((x) < 128 ? 6 : 7)))))))
-
-/*! Calculate a compile-time log2 for a uint16_t */
-#define UINT16_LOG2(x) \
- ((x < 256) ? UINT8_LOG2(x) : UINT8_LOG2((x) >> 8) + 8)
-
-/*! Calculate a compile-time log2 for a uint32_t */
-#define UINT32_LOG2(x) \
- ((x < 65536UL) ? UINT16_LOG2(x) : UINT16_LOG2((x) >> 16) + 16)
-
-#if COMPILER_VARIADIC_MACROS
- /*! Count the number of arguments (up to 16). */
- #define PP_COUNT(...) \
- PP_COUNT__(__VA_ARGS__,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
- #define PP_COUNT__(a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,count,...) \
- count
-#endif
-
-#if COMPILER_VARIADIC_MACROS
- /*!
- * \def BIT_CHANGE(reg, (mask, value), ...)
- *
- * This macro allows for efficient and compact bit toggling in a hardware
- * register. It is meant to replace hand-coded cruft which toggles bits
- * in sequence.
- *
- * It is possible to specify an unlimited pair of (mask, value) parameters.
- * For instance:
- *
- * \code
- * void set_timer(bool start)
- * {
- * BIT_CHANGE(REG_CTRL_TIMER,
- * (TIMER_MODE, MODE_COUNT),
- * (OVL_IRQ, 1),
- * (CMP_IRQ, 1),
- * (START, start)
- * );
- * }
- * \endcode
- *
- * The macro expansion will be roughly the following:
- *
- * \code
- * REG_CTRL_TIMER = (REG_CTRL_TIMER & ~(TIMER_MODE|OVL_IRQ|CMP_IRQ|START)
- * | (MODE_COUNT|OVL_IRQ|CMP_IRQ|(start ? START : 0));
- * \endcode
- *
- * It is up to the compiler to produce the optimal code. We checked that GCC produces
- * the best code in most cases. We preferred this expansion over the use of a block
- * with a local variable because CodeWarrior 6.1 was not able to remove completely the
- * allocation of the local from the stack.
- *
- * \note This macro is available only in C99 because it makes use of variadic macros.
- * It would be possible to make up an implementation with a slightly different syntax
- * for use with C90 compilers, through Boost Preprocessor.
- */
-
- /*!
- * \def BIT_CHANGE_BV(reg, (bit, value), ...)
- *
- * Similar to BIT_CHANGE(), but get bits instead of masks (and applies BV() to convert
- * them to masks).
- */
-
- #define BIT_EXTRACT_FLAG_0(bit, value) bit
- #define BIT_EXTRACT_FLAG_1(bit, value) BV(bit)
- #define BIT_EXTRACT_VALUE__(bit, value) value
-
- #define BIT_MASK_SINGLE__(use_bv, index, max, arg) \
- ((index < max) ? (PP_CAT(BIT_EXTRACT_FLAG_, use_bv) arg) : 0) \
- /**/
-
- #define BIT_MASK_IF_SINGLE__(use_bv, index, max, arg) \
- (((index < max) && (BIT_EXTRACT_VALUE__ arg)) ? (PP_CAT(BIT_EXTRACT_FLAG_, use_bv) arg) : 0) \
- /**/
-
- #define BIT_ITER__2(macro, use_bv, max, a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15, ...) \
- (macro(use_bv, 0, max, a0) | \
- macro(use_bv, 1, max, a1) | \
- macro(use_bv, 2, max, a2) | \
- macro(use_bv, 3, max, a3) | \
- macro(use_bv, 4, max, a4) | \
- macro(use_bv, 5, max, a5) | \
- macro(use_bv, 6, max, a6) | \
- macro(use_bv, 7, max, a7) | \
- macro(use_bv, 8, max, a8) | \
- macro(use_bv, 9, max, a9) | \
- macro(use_bv, 10, max, a10) | \
- macro(use_bv, 11, max, a11) | \
- macro(use_bv, 12, max, a12) | \
- macro(use_bv, 13, max, a13) | \
- macro(use_bv, 14, max, a14) | \
- macro(use_bv, 15, max, a15)) \
- /**/
-
- #define BIT_ITER__(macro, use_bv, ...) \
- BIT_ITER__2(macro, use_bv, PP_COUNT(__VA_ARGS__), __VA_ARGS__, (0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1),(0,1)) \
- /**/
-
- #define BIT_MASKS__(use_bv, ...) \
- BIT_ITER__(BIT_MASK_SINGLE__, use_bv, __VA_ARGS__)
- /**/
-
- #define BIT_MASKS_CONDITIONAL__(use_bv, ...) \
- BIT_ITER__(BIT_MASK_IF_SINGLE__, use_bv, __VA_ARGS__)
- /**/
-
- #define BIT_CHANGE__(reg, use_bv, ...) \
- ((reg) = ((reg) & ~BIT_MASKS__(use_bv, __VA_ARGS__)) | BIT_MASKS_CONDITIONAL__(use_bv, __VA_ARGS__)) \
- /**/
-
- #define BIT_CHANGE(reg, ...) BIT_CHANGE__(reg, 0, __VA_ARGS__)
- #define BIT_CHANGE_BV(reg, ...) BIT_CHANGE__(reg, 1, __VA_ARGS__)
-
-#endif /* COMPILER_VARIADIC_MACROS */
-
-#endif /* MACROS_H */
-
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