Gan likun / mbed-dev

00

platform/DeepSleepLock.h@0:13413ea9a877, 2022-06-12 (annotated)

Committer:
ganlikun
Date:
Sun Jun 12 14:02:44 2022 +0000
Revision:
0:13413ea9a877
00

Who changed what in which revision?

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ganlikun 0:13413ea9a877 1 /* mbed Microcontroller Library
ganlikun 0:13413ea9a877 2 * Copyright (c) 2017 ARM Limited
ganlikun 0:13413ea9a877 3 *
ganlikun 0:13413ea9a877 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:13413ea9a877 5 * you may not use this file except in compliance with the License.
ganlikun 0:13413ea9a877 6 * You may obtain a copy of the License at
ganlikun 0:13413ea9a877 7 *
ganlikun 0:13413ea9a877 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:13413ea9a877 9 *
ganlikun 0:13413ea9a877 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:13413ea9a877 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:13413ea9a877 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:13413ea9a877 13 * See the License for the specific language governing permissions and
ganlikun 0:13413ea9a877 14 * limitations under the License.
ganlikun 0:13413ea9a877 15 */
ganlikun 0:13413ea9a877 16 #ifndef MBED_DEEPSLEEPLOCK_H
ganlikun 0:13413ea9a877 17 #define MBED_DEEPSLEEPLOCK_H
ganlikun 0:13413ea9a877 18
ganlikun 0:13413ea9a877 19 #include <limits.h>
ganlikun 0:13413ea9a877 20 #include "platform/mbed_sleep.h"
ganlikun 0:13413ea9a877 21 #include "platform/mbed_critical.h"
ganlikun 0:13413ea9a877 22
ganlikun 0:13413ea9a877 23 namespace mbed {
ganlikun 0:13413ea9a877 24
ganlikun 0:13413ea9a877 25
ganlikun 0:13413ea9a877 26 /** RAII object for disabling, then restoring the deep sleep mode
ganlikun 0:13413ea9a877 27 * Usage:
ganlikun 0:13413ea9a877 28 * @code
ganlikun 0:13413ea9a877 29 *
ganlikun 0:13413ea9a877 30 * void f() {
ganlikun 0:13413ea9a877 31 * // some code here
ganlikun 0:13413ea9a877 32 * {
ganlikun 0:13413ea9a877 33 * DeepSleepLock lock;
ganlikun 0:13413ea9a877 34 * // Code in this block will run with the deep sleep mode locked
ganlikun 0:13413ea9a877 35 * }
ganlikun 0:13413ea9a877 36 * // deep sleep mode will be restored to their previous state
ganlikun 0:13413ea9a877 37 * }
ganlikun 0:13413ea9a877 38 * @endcode
ganlikun 0:13413ea9a877 39 */
ganlikun 0:13413ea9a877 40 class DeepSleepLock {
ganlikun 0:13413ea9a877 41 private:
ganlikun 0:13413ea9a877 42 uint16_t _lock_count;
ganlikun 0:13413ea9a877 43
ganlikun 0:13413ea9a877 44 public:
ganlikun 0:13413ea9a877 45 DeepSleepLock(): _lock_count(1)
ganlikun 0:13413ea9a877 46 {
ganlikun 0:13413ea9a877 47 sleep_manager_lock_deep_sleep();
ganlikun 0:13413ea9a877 48 }
ganlikun 0:13413ea9a877 49
ganlikun 0:13413ea9a877 50 ~DeepSleepLock()
ganlikun 0:13413ea9a877 51 {
ganlikun 0:13413ea9a877 52 if (_lock_count) {
ganlikun 0:13413ea9a877 53 sleep_manager_unlock_deep_sleep();
ganlikun 0:13413ea9a877 54 }
ganlikun 0:13413ea9a877 55 }
ganlikun 0:13413ea9a877 56
ganlikun 0:13413ea9a877 57 /** Mark the start of a locked deep sleep section
ganlikun 0:13413ea9a877 58 */
ganlikun 0:13413ea9a877 59 void lock()
ganlikun 0:13413ea9a877 60 {
ganlikun 0:13413ea9a877 61 uint16_t count = core_util_atomic_incr_u16(&_lock_count, 1);
ganlikun 0:13413ea9a877 62 if (1 == count) {
ganlikun 0:13413ea9a877 63 sleep_manager_lock_deep_sleep();
ganlikun 0:13413ea9a877 64 }
ganlikun 0:13413ea9a877 65 if (0 == count) {
ganlikun 0:13413ea9a877 66 error("DeepSleepLock overflow (> USHRT_MAX)");
ganlikun 0:13413ea9a877 67 }
ganlikun 0:13413ea9a877 68 }
ganlikun 0:13413ea9a877 69
ganlikun 0:13413ea9a877 70 /** Mark the end of a locked deep sleep section
ganlikun 0:13413ea9a877 71 */
ganlikun 0:13413ea9a877 72 void unlock()
ganlikun 0:13413ea9a877 73 {
ganlikun 0:13413ea9a877 74 uint16_t count = core_util_atomic_decr_u16(&_lock_count, 1);
ganlikun 0:13413ea9a877 75 if (count == 0) {
ganlikun 0:13413ea9a877 76 sleep_manager_unlock_deep_sleep();
ganlikun 0:13413ea9a877 77 }
ganlikun 0:13413ea9a877 78 if (count == USHRT_MAX) {
ganlikun 0:13413ea9a877 79 core_util_critical_section_exit();
ganlikun 0:13413ea9a877 80 error("DeepSleepLock underflow (< 0)");
ganlikun 0:13413ea9a877 81 }
ganlikun 0:13413ea9a877 82 }
ganlikun 0:13413ea9a877 83 };
ganlikun 0:13413ea9a877 84
ganlikun 0:13413ea9a877 85 }
ganlikun 0:13413ea9a877 86
ganlikun 0:13413ea9a877 87 #endif