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Diffstat (limited to 'watch-library/hal/include/hal_atomic.h')
-rw-r--r-- | watch-library/hal/include/hal_atomic.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/watch-library/hal/include/hal_atomic.h b/watch-library/hal/include/hal_atomic.h new file mode 100644 index 00000000..82151fc5 --- /dev/null +++ b/watch-library/hal/include/hal_atomic.h @@ -0,0 +1,120 @@ +/** + * \file + * + * \brief Critical sections related functionality declaration. + * + * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries. + * + * \asf_license_start + * + * \page License + * + * Subject to your compliance with these terms, you may use Microchip + * software and any derivatives exclusively with Microchip products. + * It is your responsibility to comply with third party license terms applicable + * to your use of third party software (including open source software) that + * may accompany Microchip software. + * + * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, + * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, + * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, + * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE + * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL + * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE + * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE + * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT + * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY + * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, + * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE. + * + * \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. + */ +#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 */ |