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121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/**
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* \file
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*
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* \brief Critical sections related functionality declaration.
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*
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* Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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#ifndef _HAL_ATOMIC_H_INCLUDED
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#define _HAL_ATOMIC_H_INCLUDED
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#include <compiler.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 doc_driver_hal_helper_atomic
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*
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*@{
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*/
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/**
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* \brief Type for the register holding global interrupt enable flag
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*/
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typedef uint32_t hal_atomic_t;
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/**
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* \brief Helper macro for entering critical sections
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*
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* This macro is recommended to be used instead of a direct call
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* hal_enterCritical() function to enter critical
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* sections. No semicolon is required after the macro.
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*
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* \section atomic_usage Usage Example
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* \code
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* CRITICAL_SECTION_ENTER()
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* Critical code
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* CRITICAL_SECTION_LEAVE()
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* \endcode
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*/
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#define CRITICAL_SECTION_ENTER() \
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{ \
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volatile hal_atomic_t __atomic; \
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atomic_enter_critical(&__atomic);
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/**
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* \brief Helper macro for leaving critical sections
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*
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* This macro is recommended to be used instead of a direct call
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* hal_leaveCritical() function to leave critical
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* sections. No semicolon is required after the macro.
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*/
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#define CRITICAL_SECTION_LEAVE() \
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atomic_leave_critical(&__atomic); \
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}
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/**
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* \brief Disable interrupts, enter critical section
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*
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* Disables global interrupts. Supports nested critical sections,
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* so that global interrupts are only re-enabled
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* upon leaving the outermost nested critical section.
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*
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* \param[out] atomic The pointer to a variable to store the value of global
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* interrupt enable flag
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*/
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void atomic_enter_critical(hal_atomic_t volatile *atomic);
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/**
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* \brief Exit atomic section
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*
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* Enables global interrupts. Supports nested critical sections,
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* so that global interrupts are only re-enabled
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* upon leaving the outermost nested critical section.
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*
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* \param[in] atomic The pointer to a variable, which stores the latest stored
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* value of the global interrupt enable flag
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*/
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void atomic_leave_critical(hal_atomic_t volatile *atomic);
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/**
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* \brief Retrieve the current driver version
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*
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* \return Current driver version.
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*/
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uint32_t atomic_get_version(void);
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/**@}*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* _HAL_ATOMIC_H_INCLUDED */
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