mirror of https://github.com/ARMmbed/mbed-os.git
99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2017 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_DEEPSLEEPLOCK_H
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#define MBED_DEEPSLEEPLOCK_H
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#include <limits.h>
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#include "platform/mbed_power_mgmt.h"
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#include "platform/mbed_critical.h"
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namespace mbed {
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/** \addtogroup platform */
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/** @{*/
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/**
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* \defgroup platform_DeepSleepLock DeepSleepLock functions
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* @{
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*/
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/** RAII object for disabling, then restoring the deep sleep mode
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* Usage:
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* @code
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*
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* void f() {
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* // some code here
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* {
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* DeepSleepLock lock;
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* // Code in this block will run with the deep sleep mode locked
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* }
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* // deep sleep mode will be restored to their previous state
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* }
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* @endcode
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*/
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class DeepSleepLock {
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private:
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uint16_t _lock_count;
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public:
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DeepSleepLock(): _lock_count(1)
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{
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sleep_manager_lock_deep_sleep();
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}
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~DeepSleepLock()
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{
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if (_lock_count) {
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sleep_manager_unlock_deep_sleep();
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}
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}
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/** Mark the start of a locked deep sleep section
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*/
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void lock()
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{
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uint16_t count = core_util_atomic_incr_u16(&_lock_count, 1);
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if (1 == count) {
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sleep_manager_lock_deep_sleep();
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}
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if (0 == count) {
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MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_OVERFLOW), "DeepSleepLock overflow (> USHRT_MAX)", count);
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}
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}
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/** Mark the end of a locked deep sleep section
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*/
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void unlock()
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{
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uint16_t count = core_util_atomic_decr_u16(&_lock_count, 1);
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if (count == 0) {
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sleep_manager_unlock_deep_sleep();
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}
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if (count == USHRT_MAX) {
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core_util_critical_section_exit();
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MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_UNDERFLOW), "DeepSleepLock underflow (< 0)", count);
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}
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}
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};
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/**@}*/
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/**@}*/
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}
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#endif
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