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/**
* \file
*
* \brief Critical sections related functionality declaration.
*
* Copyright (C) 2014 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 _HAL_ATOMIC_H_INCLUDED
#define _HAL_ATOMIC_H_INCLUDED
#include <compiler.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* \addtogroup doc_driver_hal_helper_atomic
*
*@{
*/
/**
* \brief Type for the register holding global interrupt enable flag
*/
typedef uint32_t hal_atomic_t;
/**
* \brief Helper macro for entering critical sections
*
* This macro is recommended to be used instead of a direct call
* hal_enterCritical() function to enter critical
* sections. No semicolon is required after the macro.
*
* \section atomic_usage Usage Example
* \code
* CRITICAL_SECTION_ENTER()
* Critical code
* CRITICAL_SECTION_LEAVE()
* \endcode
*/
#define CRITICAL_SECTION_ENTER() \
{ \
volatile hal_atomic_t __atomic; \
atomic_enter_critical(&__atomic);
/**
* \brief Helper macro for leaving critical sections
*
* This macro is recommended to be used instead of a direct call
* hal_leaveCritical() function to leave critical
* sections. No semicolon is required after the macro.
*
* \section atomic_usage Usage Example
* \code
* CRITICAL_SECTION_ENTER()
* Some critical code
* CRITICAL_SECTION_LEAVE()
* \endcode
*/
#define CRITICAL_SECTION_LEAVE() \
atomic_leave_critical(&__atomic); \
}
/**
* \brief Disable interrupts, enter critical section
*
* Disables global interrupts. Supports nested critical sections,
* so that global interrupts are only re-enabled
* upon leaving the outermost nested critical section.
*
* \param[out] atomic The pointer to a variable to store the value of global
* interrupt enable flag
*/
void atomic_enter_critical(hal_atomic_t volatile *atomic);
/**
* \brief Exit atomic section
*
* Enables global interrupts. Supports nested critical sections,
* so that global interrupts are only re-enabled
* upon leaving the outermost nested critical section.
*
* \param[in] atomic The pointer to a variable, which stores the latest stored
* value of the global interrupt enable flag
*/
void atomic_leave_critical(hal_atomic_t volatile *atomic);
/**
* \brief Retrieve the current driver version
*
* \return Current driver version.
*/
uint32_t atomic_get_version(void);
/**@}*/
#ifdef __cplusplus
}
#endif
#endif /* _HAL_ATOMIC_H_INCLUDED */
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