Elijah Stanger-Jones / mbed-dev

Lightweight Mbed Library for STM F4 and F7

hal/mbed_sleep_manager.c@2:0edeaf13dfb2, 2021-02-04 (annotated)

Committer:
elijahsj
Date:
Thu Feb 04 20:44:34 2021 +0000
Revision:
2:0edeaf13dfb2
Parent:
0:083111ae2a11 
modfiied for spine board;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saloutos 0:083111ae2a11 1 /* mbed Microcontroller Library
saloutos 0:083111ae2a11 2 * Copyright (c) 2017 ARM Limited
saloutos 0:083111ae2a11 3 *
saloutos 0:083111ae2a11 4 * Licensed under the Apache License, Version 2.0 (the "License");
saloutos 0:083111ae2a11 5 * you may not use this file except in compliance with the License.
saloutos 0:083111ae2a11 6 * You may obtain a copy of the License at
saloutos 0:083111ae2a11 7 *
saloutos 0:083111ae2a11 8 * http://www.apache.org/licenses/LICENSE-2.0
saloutos 0:083111ae2a11 9 *
saloutos 0:083111ae2a11 10 * Unless required by applicable law or agreed to in writing, software
saloutos 0:083111ae2a11 11 * distributed under the License is distributed on an "AS IS" BASIS,
saloutos 0:083111ae2a11 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
saloutos 0:083111ae2a11 13 * See the License for the specific language governing permissions and
saloutos 0:083111ae2a11 14 * limitations under the License.
saloutos 0:083111ae2a11 15 */
saloutos 0:083111ae2a11 16
saloutos 0:083111ae2a11 17 #include "mbed_sleep.h"
saloutos 0:083111ae2a11 18 #include "mbed_critical.h"
saloutos 0:083111ae2a11 19 #include "sleep_api.h"
saloutos 0:083111ae2a11 20 #include "mbed_error.h"
saloutos 0:083111ae2a11 21 #include <limits.h>
saloutos 0:083111ae2a11 22
saloutos 0:083111ae2a11 23 #if DEVICE_SLEEP
saloutos 0:083111ae2a11 24
saloutos 0:083111ae2a11 25 // deep sleep locking counter. A target is allowed to deep sleep if counter == 0
saloutos 0:083111ae2a11 26 static uint16_t deep_sleep_lock = 0U;
saloutos 0:083111ae2a11 27
saloutos 0:083111ae2a11 28 void sleep_manager_lock_deep_sleep(void)
saloutos 0:083111ae2a11 29 {
saloutos 0:083111ae2a11 30 core_util_critical_section_enter();
saloutos 0:083111ae2a11 31 if (deep_sleep_lock == USHRT_MAX) {
saloutos 0:083111ae2a11 32 core_util_critical_section_exit();
saloutos 0:083111ae2a11 33 error("Deep sleep lock would overflow (> USHRT_MAX)");
saloutos 0:083111ae2a11 34 }
saloutos 0:083111ae2a11 35 core_util_atomic_incr_u16(&deep_sleep_lock, 1);
saloutos 0:083111ae2a11 36 core_util_critical_section_exit();
saloutos 0:083111ae2a11 37 }
saloutos 0:083111ae2a11 38
saloutos 0:083111ae2a11 39 void sleep_manager_unlock_deep_sleep(void)
saloutos 0:083111ae2a11 40 {
saloutos 0:083111ae2a11 41 core_util_critical_section_enter();
saloutos 0:083111ae2a11 42 if (deep_sleep_lock == 0) {
saloutos 0:083111ae2a11 43 core_util_critical_section_exit();
saloutos 0:083111ae2a11 44 error("Deep sleep lock would underflow (< 0)");
saloutos 0:083111ae2a11 45 }
saloutos 0:083111ae2a11 46 core_util_atomic_decr_u16(&deep_sleep_lock, 1);
saloutos 0:083111ae2a11 47 core_util_critical_section_exit();
saloutos 0:083111ae2a11 48 }
saloutos 0:083111ae2a11 49
saloutos 0:083111ae2a11 50 bool sleep_manager_can_deep_sleep(void)
saloutos 0:083111ae2a11 51 {
saloutos 0:083111ae2a11 52 return deep_sleep_lock == 0 ? true : false;
saloutos 0:083111ae2a11 53 }
saloutos 0:083111ae2a11 54
saloutos 0:083111ae2a11 55 void sleep_manager_sleep_auto(void)
saloutos 0:083111ae2a11 56 {
saloutos 0:083111ae2a11 57 core_util_critical_section_enter();
saloutos 0:083111ae2a11 58 // debug profile should keep debuggers attached, no deep sleep allowed
saloutos 0:083111ae2a11 59 #ifdef MBED_DEBUG
saloutos 0:083111ae2a11 60 hal_sleep();
saloutos 0:083111ae2a11 61 #else
saloutos 0:083111ae2a11 62 if (sleep_manager_can_deep_sleep()) {
saloutos 0:083111ae2a11 63 hal_deepsleep();
saloutos 0:083111ae2a11 64 } else {
saloutos 0:083111ae2a11 65 hal_sleep();
saloutos 0:083111ae2a11 66 }
saloutos 0:083111ae2a11 67 #endif
saloutos 0:083111ae2a11 68 core_util_critical_section_exit();
saloutos 0:083111ae2a11 69 }
saloutos 0:083111ae2a11 70
saloutos 0:083111ae2a11 71 #else
saloutos 0:083111ae2a11 72
saloutos 0:083111ae2a11 73 // locking is valid only if DEVICE_SLEEP is defined
saloutos 0:083111ae2a11 74 // we provide empty implementation
saloutos 0:083111ae2a11 75
saloutos 0:083111ae2a11 76 void sleep_manager_lock_deep_sleep(void)
saloutos 0:083111ae2a11 77 {
saloutos 0:083111ae2a11 78
saloutos 0:083111ae2a11 79 }
saloutos 0:083111ae2a11 80
saloutos 0:083111ae2a11 81 void sleep_manager_unlock_deep_sleep(void)
saloutos 0:083111ae2a11 82 {
saloutos 0:083111ae2a11 83
saloutos 0:083111ae2a11 84 }
saloutos 0:083111ae2a11 85
saloutos 0:083111ae2a11 86 bool sleep_manager_can_deep_sleep(void)
saloutos 0:083111ae2a11 87 {
saloutos 0:083111ae2a11 88 // no sleep implemented
saloutos 0:083111ae2a11 89 return false;
saloutos 0:083111ae2a11 90 }
saloutos 0:083111ae2a11 91
saloutos 0:083111ae2a11 92 #endif