Denislam Valeev / Mbed OS Nucleo_rtos_basic

1

mbed-os/drivers/Timer.cpp@0:e056ac8fecf8, 2018-03-13 (annotated)

Committer:
valeyev
Date:
Tue Mar 13 07:17:50 2018 +0000
Revision:
0:e056ac8fecf8
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valeyev 0:e056ac8fecf8 1 /* mbed Microcontroller Library
valeyev 0:e056ac8fecf8 2 * Copyright (c) 2006-2013 ARM Limited
valeyev 0:e056ac8fecf8 3 *
valeyev 0:e056ac8fecf8 4 * Licensed under the Apache License, Version 2.0 (the "License");
valeyev 0:e056ac8fecf8 5 * you may not use this file except in compliance with the License.
valeyev 0:e056ac8fecf8 6 * You may obtain a copy of the License at
valeyev 0:e056ac8fecf8 7 *
valeyev 0:e056ac8fecf8 8 * http://www.apache.org/licenses/LICENSE-2.0
valeyev 0:e056ac8fecf8 9 *
valeyev 0:e056ac8fecf8 10 * Unless required by applicable law or agreed to in writing, software
valeyev 0:e056ac8fecf8 11 * distributed under the License is distributed on an "AS IS" BASIS,
valeyev 0:e056ac8fecf8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
valeyev 0:e056ac8fecf8 13 * See the License for the specific language governing permissions and
valeyev 0:e056ac8fecf8 14 * limitations under the License.
valeyev 0:e056ac8fecf8 15 */
valeyev 0:e056ac8fecf8 16 #include "drivers/Timer.h"
valeyev 0:e056ac8fecf8 17 #include "hal/ticker_api.h"
valeyev 0:e056ac8fecf8 18 #include "hal/us_ticker_api.h"
valeyev 0:e056ac8fecf8 19 #include "platform/mbed_critical.h"
valeyev 0:e056ac8fecf8 20 #include "hal/lp_ticker_api.h"
valeyev 0:e056ac8fecf8 21
valeyev 0:e056ac8fecf8 22 namespace mbed {
valeyev 0:e056ac8fecf8 23
valeyev 0:e056ac8fecf8 24 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()), _lock_deepsleep(true) {
valeyev 0:e056ac8fecf8 25 reset();
valeyev 0:e056ac8fecf8 26 }
valeyev 0:e056ac8fecf8 27
valeyev 0:e056ac8fecf8 28 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data), _lock_deepsleep(true) {
valeyev 0:e056ac8fecf8 29 reset();
valeyev 0:e056ac8fecf8 30 #if DEVICE_LOWPOWERTIMER
valeyev 0:e056ac8fecf8 31 _lock_deepsleep = (data != get_lp_ticker_data());
valeyev 0:e056ac8fecf8 32 #endif
valeyev 0:e056ac8fecf8 33 }
valeyev 0:e056ac8fecf8 34
valeyev 0:e056ac8fecf8 35 Timer::~Timer() {
valeyev 0:e056ac8fecf8 36 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 37 if (_running) {
valeyev 0:e056ac8fecf8 38 if(_lock_deepsleep) {
valeyev 0:e056ac8fecf8 39 sleep_manager_unlock_deep_sleep();
valeyev 0:e056ac8fecf8 40 }
valeyev 0:e056ac8fecf8 41 }
valeyev 0:e056ac8fecf8 42 _running = 0;
valeyev 0:e056ac8fecf8 43 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 44 }
valeyev 0:e056ac8fecf8 45
valeyev 0:e056ac8fecf8 46 void Timer::start() {
valeyev 0:e056ac8fecf8 47 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 48 if (!_running) {
valeyev 0:e056ac8fecf8 49 if(_lock_deepsleep) {
valeyev 0:e056ac8fecf8 50 sleep_manager_lock_deep_sleep();
valeyev 0:e056ac8fecf8 51 }
valeyev 0:e056ac8fecf8 52 _start = ticker_read_us(_ticker_data);
valeyev 0:e056ac8fecf8 53 _running = 1;
valeyev 0:e056ac8fecf8 54 }
valeyev 0:e056ac8fecf8 55 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 56 }
valeyev 0:e056ac8fecf8 57
valeyev 0:e056ac8fecf8 58 void Timer::stop() {
valeyev 0:e056ac8fecf8 59 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 60 _time += slicetime();
valeyev 0:e056ac8fecf8 61 if (_running) {
valeyev 0:e056ac8fecf8 62 if(_lock_deepsleep) {
valeyev 0:e056ac8fecf8 63 sleep_manager_unlock_deep_sleep();
valeyev 0:e056ac8fecf8 64 }
valeyev 0:e056ac8fecf8 65 }
valeyev 0:e056ac8fecf8 66 _running = 0;
valeyev 0:e056ac8fecf8 67 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 68 }
valeyev 0:e056ac8fecf8 69
valeyev 0:e056ac8fecf8 70 int Timer::read_us() {
valeyev 0:e056ac8fecf8 71 return read_high_resolution_us();
valeyev 0:e056ac8fecf8 72 }
valeyev 0:e056ac8fecf8 73
valeyev 0:e056ac8fecf8 74 float Timer::read() {
valeyev 0:e056ac8fecf8 75 return (float)read_us() / 1000000.0f;
valeyev 0:e056ac8fecf8 76 }
valeyev 0:e056ac8fecf8 77
valeyev 0:e056ac8fecf8 78 int Timer::read_ms() {
valeyev 0:e056ac8fecf8 79 return read_high_resolution_us() / 1000;
valeyev 0:e056ac8fecf8 80 }
valeyev 0:e056ac8fecf8 81
valeyev 0:e056ac8fecf8 82 us_timestamp_t Timer::read_high_resolution_us() {
valeyev 0:e056ac8fecf8 83 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 84 us_timestamp_t time = _time + slicetime();
valeyev 0:e056ac8fecf8 85 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 86 return time;
valeyev 0:e056ac8fecf8 87 }
valeyev 0:e056ac8fecf8 88
valeyev 0:e056ac8fecf8 89 us_timestamp_t Timer::slicetime() {
valeyev 0:e056ac8fecf8 90 us_timestamp_t ret = 0;
valeyev 0:e056ac8fecf8 91 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 92 if (_running) {
valeyev 0:e056ac8fecf8 93 ret = ticker_read_us(_ticker_data) - _start;
valeyev 0:e056ac8fecf8 94 }
valeyev 0:e056ac8fecf8 95 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 96 return ret;
valeyev 0:e056ac8fecf8 97 }
valeyev 0:e056ac8fecf8 98
valeyev 0:e056ac8fecf8 99 void Timer::reset() {
valeyev 0:e056ac8fecf8 100 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 101 _start = ticker_read_us(_ticker_data);
valeyev 0:e056ac8fecf8 102 _time = 0;
valeyev 0:e056ac8fecf8 103 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 104 }
valeyev 0:e056ac8fecf8 105
valeyev 0:e056ac8fecf8 106 Timer::operator float() {
valeyev 0:e056ac8fecf8 107 return read();
valeyev 0:e056ac8fecf8 108 }
valeyev 0:e056ac8fecf8 109
valeyev 0:e056ac8fecf8 110 } // namespace mbed