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141 lines
4.9 KiB
C
141 lines
4.9 KiB
C
/***************************************************************************//**
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* @file em_common.h
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* @brief Emlib general purpose utilities.
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* @version 4.2.1
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
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* obligation to support this Software. Silicon Labs is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Silicon Labs will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#ifndef __SILICON_LABS_EM_COMMON_H__
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#define __SILICON_LABS_EM_COMMON_H__
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#include "em_device.h"
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************************************************************//**
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* @addtogroup EM_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup COMMON
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* @brief Emlib general purpose utilities.
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* @{
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******************************************************************************/
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#if !defined(__GNUC__)
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/** Macro for getting minimum value. */
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#define EFM32_MIN(a, b) ((a) < (b) ? (a) : (b))
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/** Macro for getting maximum value. */
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#define EFM32_MAX(a, b) ((a) > (b) ? (a) : (b))
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/** Macros for handling packed structs. */
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#define STRINGIZE(X) #X
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#define EFM32_PACK_START(X) _Pragma( STRINGIZE( pack( X ) ) )
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#define EFM32_PACK_END() _Pragma( "pack()" )
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#define __attribute__(...)
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#ifdef __CC_ARM
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/** Macros for handling aligned structs. */
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#define EFM32_ALIGN(X) __align(X)
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#endif
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#ifdef __ICCARM__
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/** Macros for handling aligned structs. */
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#define EFM32_ALIGN(X) _Pragma( STRINGIZE( data_alignment=X ) )
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#endif
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#else // !defined(__GNUC__)
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/** Macro for getting minimum value. No sideeffects, a and b are evaluated once only. */
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#define EFM32_MIN(a, b) ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a < _b ? _a : _b; })
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/** Macro for getting maximum value. No sideeffects, a and b are evaluated once only. */
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#define EFM32_MAX(a, b) ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a > _b ? _a : _b; })
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/** Macro for handling packed structs.
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* @n Use this macro before the struct definition.
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* @n X denotes the maximum alignment of struct members. X is not supported on
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* gcc, gcc always use 1 byte maximum alignment.
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*/
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#define EFM32_PACK_START( x )
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/** Macro for handling packed structs.
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* @n Use this macro after the struct definition.
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* @n On gcc add __attribute__ ((packed)) after the closing } of the struct
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* definition.
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*/
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#define EFM32_PACK_END()
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/** Macro for aligning a variable.
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* @n Use this macro before the variable definition.
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* @n X denotes the storage alignment value in bytes.
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* @n On gcc use __attribute__ ((aligned(X))) before the ; on normal variables.
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* Use __attribute__ ((aligned(X))) before the opening { on struct variables.
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*/
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#define EFM32_ALIGN(X)
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#endif // !defined(__GNUC__)
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/***************************************************************************//**
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* @brief
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* Count trailing number of zero's.
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*
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* @note
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* Disabling SWDClk will disable the debug interface, which may result in
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* a lockout if done early in startup (before debugger is able to halt core).
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*
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* @param[in] value
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* Data value to check for number of trailing zero bits.
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*
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* @return
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* Number of trailing zero's in value.
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******************************************************************************/
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__STATIC_INLINE uint32_t EFM32_CTZ(uint32_t value)
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{
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#if (__CORTEX_M >= 3)
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return __CLZ(__RBIT(value));
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#else
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uint32_t zeros;
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for(zeros=0; (zeros<32) && ((value&0x1) == 0); zeros++, value>>=1);
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return zeros;
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#endif
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}
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/** @} (end addtogroup COMMON) */
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/** @} (end addtogroup EM_Library) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SILICON_LABS_EM_COMMON_H__ */
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