/** * \file * * \brief Different macros. * * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved. * * \asf_license_start * * \page License * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name of Atmel may not be used to endorse or promote products derived * from this software without specific prior written permission. * * 4. This software may only be redistributed and used in connection with an * Atmel microcontroller product. * * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * \asf_license_stop * */ #ifndef UTILS_H_INCLUDED #define UTILS_H_INCLUDED #ifdef __cplusplus extern "C" { #endif /** * \addtogroup doc_driver_hal_utils_macro * * @{ */ /** * \brief Retrieve pointer to parent structure */ #define CONTAINER_OF(ptr, type, field_name) ((type *)(((uint8_t *)ptr) - offsetof(type, field_name))) /** * \brief Retrieve array size */ #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) /** * \brief Emit the compiler pragma \a arg. * * \param[in] arg The pragma directive as it would appear after \e \#pragma * (i.e. not stringified). */ #define COMPILER_PRAGMA(arg) _Pragma(#arg) /** * \def COMPILER_PACK_SET(alignment) * \brief Set maximum alignment for subsequent struct and union definitions to \a alignment. */ #define COMPILER_PACK_SET(alignment) COMPILER_PRAGMA(pack(alignment)) /** * \def COMPILER_PACK_RESET() * \brief Set default alignment for subsequent struct and union definitions. */ #define COMPILER_PACK_RESET() COMPILER_PRAGMA(pack()) /** * \brief Set aligned boundary. */ #if defined __GNUC__ #define COMPILER_ALIGNED(a) __attribute__((__aligned__(a))) #elif defined __ICCARM__ #define COMPILER_ALIGNED(a) COMPILER_PRAGMA(data_alignment = a) #elif defined __CC_ARM #define COMPILER_ALIGNED(a) __attribute__((__aligned__(a))) #endif /** * \brief Flash located data macros */ #if defined __GNUC__ #define PROGMEM_DECLARE(type, name) const type name #define PROGMEM_T const #define PROGMEM_READ_BYTE(x) *((uint8_t *)(x)) #define PROGMEM_PTR_T const * #define PROGMEM_STRING_T const uint8_t * #elif defined __ICCARM__ #define PROGMEM_DECLARE(type, name) const type name #define PROGMEM_T const #define PROGMEM_READ_BYTE(x) *((uint8_t *)(x)) #define PROGMEM_PTR_T const * #define PROGMEM_STRING_T const uint8_t * #elif defined __CC_ARM #define PROGMEM_DECLARE(type, name) const type name #define PROGMEM_T const #define PROGMEM_READ_BYTE(x) *((uint8_t *)(x)) #define PROGMEM_PTR_T const * #define PROGMEM_STRING_T const uint8_t * #endif /** * \brief Optimization */ #if defined __GNUC__ #define OPTIMIZE_HIGH __attribute__((optimize(s))) #elif defined __CC_ARM #define OPTIMIZE_HIGH _Pragma("O3") #elif defined __ICCARM__ #define OPTIMIZE_HIGH _Pragma("optimize=high") #endif /** * \brief RAM located function attribute */ #if defined(__CC_ARM) /* Keil ?Vision 4 */ #define RAMFUNC __attribute__((section(".ramfunc"))) #elif defined(__ICCARM__) /* IAR Ewarm 5.41+ */ #define RAMFUNC __ramfunc #elif defined(__GNUC__) /* GCC CS3 2009q3-68 */ #define RAMFUNC __attribute__((section(".ramfunc"))) #endif /** * \brief No-init section. * Place a data object or a function in a no-init section. */ #if defined(__CC_ARM) #define NO_INIT(a) __attribute__((zero_init)) #elif defined(__ICCARM__) #define NO_INIT(a) __no_init #elif defined(__GNUC__) #define NO_INIT(a) __attribute__((section(".no_init"))) #endif /** * \brief Set user-defined section. * Place a data object or a function in a user-defined section. */ #if defined(__CC_ARM) #define COMPILER_SECTION(a) __attribute__((__section__(a))) #elif defined(__ICCARM__) #define COMPILER_SECTION(a) COMPILER_PRAGMA(location = a) #elif defined(__GNUC__) #define COMPILER_SECTION(a) __attribute__((__section__(a))) #endif /** * \brief Define WEAK attribute. */ #if defined(__CC_ARM) /* Keil ?Vision 4 */ #define WEAK __attribute__((weak)) #elif defined(__ICCARM__) /* IAR Ewarm 5.41+ */ #define WEAK __weak #elif defined(__GNUC__) /* GCC CS3 2009q3-68 */ #define WEAK __attribute__((weak)) #endif /** * \brief Pointer to function */ typedef void (*FUNC_PTR)(void); #define LE_BYTE0(a) ((uint8_t)(a)) #define LE_BYTE1(a) ((uint8_t)((a) >> 8)) #define LE_BYTE2(a) ((uint8_t)((a) >> 16)) #define LE_BYTE3(a) ((uint8_t)((a) >> 24)) #define LE_2_U16(p) ((p)[0] + ((p)[1] << 8)) #define LE_2_U32(p) ((p)[0] + ((p)[1] << 8) + ((p)[2] << 16) + ((p)[3] << 24)) /** \name Zero-Bit Counting * * Under GCC, __builtin_clz and __builtin_ctz behave like macros when * applied to constant expressions (values known at compile time), so they are * more optimized than the use of the corresponding assembly instructions and * they can be used as constant expressions e.g. to initialize objects having * static storage duration, and like the corresponding assembly instructions * when applied to non-constant expressions (values unknown at compile time), so * they are more optimized than an assembly periphrasis. Hence, clz and ctz * ensure a possible and optimized behavior for both constant and non-constant * expressions. * * @{ */ /** \brief Counts the leading zero bits of the given value considered as a 32-bit integer. * * \param[in] u Value of which to count the leading zero bits. * * \return The count of leading zero bits in \a u. */ #if (defined __GNUC__) || (defined __CC_ARM) #define clz(u) __builtin_clz(u) #else #define clz(u) \ (((u) == 0) \ ? 32 \ : ((u) & (1ul << 31)) ? 0 : ((u) & (1ul << 30)) ? 1 : ((u) & (1ul << 29)) \ ? 2 \ : ((u) & (1ul << 28)) \ ? 3 \ : ((u) & (1ul << 27)) \ ? 4 \ : ((u) & (1ul << 26)) \ ? 5 \ : ((u) & (1ul << 25)) ? 6 \ : ((u) & (1ul << 24)) ? 7 : ((u) & (1ul << 23)) ? 8 : ((u) & (1ul << 22)) ? 9 : ((u) & (1ul << 21)) ? 10 : ((u) & (1ul << 20)) ? 11 : (( \ u) \ & (1ul \ << 19)) \ ? 12 \ : ((u) \ & (1ul \ << 18)) \ ? 13 \ : ( \ (u) \ & (1ul \ << 17)) \ ? 14 \ : ((u) & (1ul << 16)) ? 15 \ : ((u) \ & (1ul \ << 15)) \ ? 16 \ : ((u) & (1ul << 14)) ? 17 \ : ((u) & (1ul << 13)) ? 18 : ((u) & (1ul << 12)) ? 19 : ((u) & (1ul << 11)) ? 20 \ : ((u) \ & (1ul \ << 10)) \ ? 21 \ : ((u) & (1ul << 9)) ? 22 \ : ((u) & (1ul << 8)) ? 23 : ((u) \ & (1ul \ << 7)) \ ? 24 \ : ((u) & (1ul << 6)) ? 25 : ((u) & (1ul << 5)) ? 26 : ((u) & (1ul << 4)) ? 27 : ((u) & (1ul << 3)) ? 28 : ((u) \ & (1ul \ << 2)) \ ? 29 \ : ((u) & (1ul << 1)) ? 30 \ : 31) #endif /** \brief Counts the trailing zero bits of the given value considered as a 32-bit integer. * * \param[in] u Value of which to count the trailing zero bits. * * \return The count of trailing zero bits in \a u. */ #if (defined __GNUC__) || (defined __CC_ARM) #define ctz(u) __builtin_ctz(u) #else #define ctz(u) \ ( \ (u) & (1ul << 0) \ ? 0 \ : (u) & (1ul << 1) \ ? 1 \ : (u) & (1ul << 2) \ ? 2 \ : (u) & (1ul << 3) \ ? 3 \ : (u) & (1ul << 4) \ ? 4 \ : (u) & (1ul << 5) \ ? 5 \ : (u) & (1ul << 6) \ ? 6 \ : (u) & (1ul << 7) \ ? 7 \ : (u) & (1ul << 8) \ ? 8 \ : (u) & (1ul << 9) ? 9 \ : (u) & (1ul << 10) \ ? 10 \ : (u) & (1ul << 11) \ ? 11 \ : (u) & (1ul << 12) \ ? 12 \ : (u) & (1ul << 13) \ ? 13 \ : (u) & (1ul \ << 14) \ ? 14 \ : (u) & (1ul \ << 15) \ ? 15 \ : (u) & (1ul << 16) ? 16 : (u) & (1ul << 17) ? 17 : (u) & (1ul << 18) ? 18 : (u) & (1ul << 19) ? 19 : (u) & (1ul << 20) ? 20 : (u) \ & (1ul \ << 21) \ ? 21 \ : (u) & (1ul << 22) ? 22 : (u) \ & (1ul << 23) \ ? 23 \ : (u) & (1ul << 24) ? 24 \ : (u) & (1ul << 25) ? 25 \ : (u) & (1ul << 26) ? 26 : (u) & (1ul \ << 27) \ ? 27 \ : (u) & (1ul \ << 28) \ ? 28 \ : (u) & (1ul << 29) ? 29 \ : (u) & (1ul << 30) ? 30 : ( \ u) & (1ul << 31) \ ? 31 \ : 32) #endif /** @} */ /** * \brief Counts the number of bits in a mask (no more than 32 bits) * \param[in] mask Mask of which to count the bits. */ #define size_of_mask(mask) (32 - clz(mask) - ctz(mask)) /** * \brief Retrieve the start position of bits mask (no more than 32 bits) * \param[in] mask Mask of which to retrieve the start position. */ #define pos_of_mask(mask) ctz(mask) /** * \brief Return division result of a/b and round up the result to the closest * number divisible by "b" */ #define round_up(a, b) (((a)-1) / (b) + 1) /** * \brief Get the minimum of x and y */ #define min(x, y) ((x) > (y) ? (y) : (x)) /** * \brief Get the maximum of x and y */ #define max(x, y) ((x) > (y) ? (x) : (y)) /**@}*/ #ifdef __cplusplus } #endif #endif /* UTILS_H_INCLUDED */