joey shelton / LED_Demo2

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Dependencies:   MAX44000 PWM_Tone_Library nexpaq_mdk

Fork of LED_Demo by joey shelton

mbd_os/hal/common/Timer.cpp@1:55a6170b404f, 2016-09-17 (annotated)

Committer:
nexpaq
Date:
Sat Sep 17 16:32:05 2016 +0000
Revision:
1:55a6170b404f
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nexpaq 1:55a6170b404f 1 /* mbed Microcontroller Library
nexpaq 1:55a6170b404f 2 * Copyright (c) 2006-2013 ARM Limited
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * Licensed under the Apache License, Version 2.0 (the "License");
nexpaq 1:55a6170b404f 5 * you may not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 6 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 7 *
nexpaq 1:55a6170b404f 8 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 9 *
nexpaq 1:55a6170b404f 10 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 11 * distributed under the License is distributed on an "AS IS" BASIS,
nexpaq 1:55a6170b404f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 13 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 14 * limitations under the License.
nexpaq 1:55a6170b404f 15 */
nexpaq 1:55a6170b404f 16 #include "Timer.h"
nexpaq 1:55a6170b404f 17 #include "ticker_api.h"
nexpaq 1:55a6170b404f 18 #include "us_ticker_api.h"
nexpaq 1:55a6170b404f 19 #include "critical.h"
nexpaq 1:55a6170b404f 20
nexpaq 1:55a6170b404f 21 namespace mbed {
nexpaq 1:55a6170b404f 22
nexpaq 1:55a6170b404f 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
nexpaq 1:55a6170b404f 24 reset();
nexpaq 1:55a6170b404f 25 }
nexpaq 1:55a6170b404f 26
nexpaq 1:55a6170b404f 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
nexpaq 1:55a6170b404f 28 reset();
nexpaq 1:55a6170b404f 29 }
nexpaq 1:55a6170b404f 30
nexpaq 1:55a6170b404f 31 void Timer::start() {
nexpaq 1:55a6170b404f 32 core_util_critical_section_enter();
nexpaq 1:55a6170b404f 33 if (!_running) {
nexpaq 1:55a6170b404f 34 _start = ticker_read(_ticker_data);
nexpaq 1:55a6170b404f 35 _running = 1;
nexpaq 1:55a6170b404f 36 }
nexpaq 1:55a6170b404f 37 core_util_critical_section_exit();
nexpaq 1:55a6170b404f 38 }
nexpaq 1:55a6170b404f 39
nexpaq 1:55a6170b404f 40 void Timer::stop() {
nexpaq 1:55a6170b404f 41 core_util_critical_section_enter();
nexpaq 1:55a6170b404f 42 _time += slicetime();
nexpaq 1:55a6170b404f 43 _running = 0;
nexpaq 1:55a6170b404f 44 core_util_critical_section_exit();
nexpaq 1:55a6170b404f 45 }
nexpaq 1:55a6170b404f 46
nexpaq 1:55a6170b404f 47 int Timer::read_us() {
nexpaq 1:55a6170b404f 48 core_util_critical_section_enter();
nexpaq 1:55a6170b404f 49 int time = _time + slicetime();
nexpaq 1:55a6170b404f 50 core_util_critical_section_exit();
nexpaq 1:55a6170b404f 51 return time;
nexpaq 1:55a6170b404f 52 }
nexpaq 1:55a6170b404f 53
nexpaq 1:55a6170b404f 54 float Timer::read() {
nexpaq 1:55a6170b404f 55 return (float)read_us() / 1000000.0f;
nexpaq 1:55a6170b404f 56 }
nexpaq 1:55a6170b404f 57
nexpaq 1:55a6170b404f 58 int Timer::read_ms() {
nexpaq 1:55a6170b404f 59 return read_us() / 1000;
nexpaq 1:55a6170b404f 60 }
nexpaq 1:55a6170b404f 61
nexpaq 1:55a6170b404f 62 int Timer::slicetime() {
nexpaq 1:55a6170b404f 63 core_util_critical_section_enter();
nexpaq 1:55a6170b404f 64 int ret = 0;
nexpaq 1:55a6170b404f 65 if (_running) {
nexpaq 1:55a6170b404f 66 ret = ticker_read(_ticker_data) - _start;
nexpaq 1:55a6170b404f 67 }
nexpaq 1:55a6170b404f 68 core_util_critical_section_exit();
nexpaq 1:55a6170b404f 69 return ret;
nexpaq 1:55a6170b404f 70 }
nexpaq 1:55a6170b404f 71
nexpaq 1:55a6170b404f 72 void Timer::reset() {
nexpaq 1:55a6170b404f 73 core_util_critical_section_enter();
nexpaq 1:55a6170b404f 74 _start = ticker_read(_ticker_data);
nexpaq 1:55a6170b404f 75 _time = 0;
nexpaq 1:55a6170b404f 76 core_util_critical_section_exit();
nexpaq 1:55a6170b404f 77 }
nexpaq 1:55a6170b404f 78
nexpaq 1:55a6170b404f 79 Timer::operator float() {
nexpaq 1:55a6170b404f 80 return read();
nexpaq 1:55a6170b404f 81 }
nexpaq 1:55a6170b404f 82
nexpaq 1:55a6170b404f 83 } // namespace mbed