rt-thread-official/bsp/efm32/Libraries/emlib/inc/em_common.h

/***************************************************************************//**
 * @file
 * @brief EFM32 general purpose utilities.
 * @author Energy Micro AS
 * @version 3.0.0
 *******************************************************************************
 * @section License
 * <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
 *******************************************************************************
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
 * obligation to support this Software. Energy Micro AS is providing the
 * Software "AS IS", with no express or implied warranties of any kind,
 * including, but not limited to, any implied warranties of merchantability
 * or fitness for any particular purpose or warranties against infringement
 * of any proprietary rights of a third party.
 *
 * Energy Micro AS will not be liable for any consequential, incidental, or
 * special damages, or any other relief, or for any claim by any third party,
 * arising from your use of this Software.
 *
 ******************************************************************************/
#ifndef __EM_COMMON_H
#define __EM_COMMON_H

#include <stdint.h>
#include <stdbool.h>


#ifdef __cplusplus
extern "C" {
#endif

/***************************************************************************//**
 * @addtogroup EM_Library
 * @{
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup COMMON
 * @brief EFM32 general purpose utilities.
 * @{
 ******************************************************************************/

#if !defined(__GNUC__)

/** Macro for getting minimum value. */
#define EFM32_MIN(a, b)    ((a) < (b) ? (a) : (b))
/** Macro for getting maximum value. */
#define EFM32_MAX(a, b)    ((a) > (b) ? (a) : (b))

/** Macros for handling packed structs. */
#define STRINGIZE(X) #X
#define EFM32_PACK_START(X) _Pragma( STRINGIZE( pack( ##X## ) ) )
#define EFM32_PACK_END()    _Pragma( "pack()" )
#define __attribute__(...)

/** Macros for handling aligned structs. */
#ifdef __CC_ARM
#define EFM32_ALIGN(X) __align(X)
#endif
#ifdef __ICCARM__
#define EFM32_ALIGN(X) _Pragma( STRINGIZE( data_alignment=##X## ) )
#endif

#else

/** Macro for getting minimum value. No sideeffects, a and b are evaluated once only. */
#define EFM32_MIN(a, b)    ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a < _b ? _a : _b; })
/** Macro for getting maximum value. No sideeffects, a and b are evaluated once only. */
#define EFM32_MAX(a, b)    ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a > _b ? _a : _b; })

/** Macro for handling packed structs.
 *  @n Use this macro before the struct definition.
 *  @n X denotes the maximum alignment of struct members. X is not supported on
 *  gcc, gcc always use 1 byte maximum alignment.
 */
#define EFM32_PACK_START( x )

/** Macro for handling packed structs.
 *  @n Use this macro after the struct definition.
 *  @n On gcc add __attribute__ ((packed)) after the closing } of the struct
 *  definition.
 */
#define EFM32_PACK_END()

/** Macro for aligning a variable.
 *  @n Use this macro before the variable definition.
 *  @n X denotes the storage alignment value in bytes.
 *  @n On gcc use __attribute__ ((aligned(X))) before the ; on normal variables.
 *  Use __attribute__ ((aligned(X))) before the opening { on struct variables.
 */
#define EFM32_ALIGN(X)

#endif

/** @} (end addtogroup COMMON) */
/** @} (end addtogroup EM_Library) */

#ifdef __cplusplus
}
#endif

#endif /* __EM_COMMON_H */