TUKS MCU Introductory course / TUKS-COURSE-TIMER

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mbed-dev/drivers/Timer.cpp@1:d0dfbce63a89, 2017-02-24 (annotated)

Committer:
elmot
Date:
Fri Feb 24 21:13:56 2017 +0000
Revision:
1:d0dfbce63a89
Ready-to-copy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmot 1:d0dfbce63a89 1 /* mbed Microcontroller Library
elmot 1:d0dfbce63a89 2 * Copyright (c) 2006-2013 ARM Limited
elmot 1:d0dfbce63a89 3 *
elmot 1:d0dfbce63a89 4 * Licensed under the Apache License, Version 2.0 (the "License");
elmot 1:d0dfbce63a89 5 * you may not use this file except in compliance with the License.
elmot 1:d0dfbce63a89 6 * You may obtain a copy of the License at
elmot 1:d0dfbce63a89 7 *
elmot 1:d0dfbce63a89 8 * http://www.apache.org/licenses/LICENSE-2.0
elmot 1:d0dfbce63a89 9 *
elmot 1:d0dfbce63a89 10 * Unless required by applicable law or agreed to in writing, software
elmot 1:d0dfbce63a89 11 * distributed under the License is distributed on an "AS IS" BASIS,
elmot 1:d0dfbce63a89 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elmot 1:d0dfbce63a89 13 * See the License for the specific language governing permissions and
elmot 1:d0dfbce63a89 14 * limitations under the License.
elmot 1:d0dfbce63a89 15 */
elmot 1:d0dfbce63a89 16 #include "drivers/Timer.h"
elmot 1:d0dfbce63a89 17 #include "hal/ticker_api.h"
elmot 1:d0dfbce63a89 18 #include "hal/us_ticker_api.h"
elmot 1:d0dfbce63a89 19 #include "platform/critical.h"
elmot 1:d0dfbce63a89 20
elmot 1:d0dfbce63a89 21 namespace mbed {
elmot 1:d0dfbce63a89 22
elmot 1:d0dfbce63a89 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
elmot 1:d0dfbce63a89 24 reset();
elmot 1:d0dfbce63a89 25 }
elmot 1:d0dfbce63a89 26
elmot 1:d0dfbce63a89 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
elmot 1:d0dfbce63a89 28 reset();
elmot 1:d0dfbce63a89 29 }
elmot 1:d0dfbce63a89 30
elmot 1:d0dfbce63a89 31 void Timer::start() {
elmot 1:d0dfbce63a89 32 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 33 if (!_running) {
elmot 1:d0dfbce63a89 34 _start = ticker_read(_ticker_data);
elmot 1:d0dfbce63a89 35 _running = 1;
elmot 1:d0dfbce63a89 36 }
elmot 1:d0dfbce63a89 37 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 38 }
elmot 1:d0dfbce63a89 39
elmot 1:d0dfbce63a89 40 void Timer::stop() {
elmot 1:d0dfbce63a89 41 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 42 _time += slicetime();
elmot 1:d0dfbce63a89 43 _running = 0;
elmot 1:d0dfbce63a89 44 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 45 }
elmot 1:d0dfbce63a89 46
elmot 1:d0dfbce63a89 47 int Timer::read_us() {
elmot 1:d0dfbce63a89 48 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 49 int time = _time + slicetime();
elmot 1:d0dfbce63a89 50 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 51 return time;
elmot 1:d0dfbce63a89 52 }
elmot 1:d0dfbce63a89 53
elmot 1:d0dfbce63a89 54 float Timer::read() {
elmot 1:d0dfbce63a89 55 return (float)read_us() / 1000000.0f;
elmot 1:d0dfbce63a89 56 }
elmot 1:d0dfbce63a89 57
elmot 1:d0dfbce63a89 58 int Timer::read_ms() {
elmot 1:d0dfbce63a89 59 return read_us() / 1000;
elmot 1:d0dfbce63a89 60 }
elmot 1:d0dfbce63a89 61
elmot 1:d0dfbce63a89 62 int Timer::slicetime() {
elmot 1:d0dfbce63a89 63 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 64 int ret = 0;
elmot 1:d0dfbce63a89 65 if (_running) {
elmot 1:d0dfbce63a89 66 ret = ticker_read(_ticker_data) - _start;
elmot 1:d0dfbce63a89 67 }
elmot 1:d0dfbce63a89 68 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 69 return ret;
elmot 1:d0dfbce63a89 70 }
elmot 1:d0dfbce63a89 71
elmot 1:d0dfbce63a89 72 void Timer::reset() {
elmot 1:d0dfbce63a89 73 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 74 _start = ticker_read(_ticker_data);
elmot 1:d0dfbce63a89 75 _time = 0;
elmot 1:d0dfbce63a89 76 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 77 }
elmot 1:d0dfbce63a89 78
elmot 1:d0dfbce63a89 79 Timer::operator float() {
elmot 1:d0dfbce63a89 80 return read();
elmot 1:d0dfbce63a89 81 }
elmot 1:d0dfbce63a89 82
elmot 1:d0dfbce63a89 83 } // namespace mbed