Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

drivers/Timer.cpp@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "drivers/Timer.h"
elessair 0:f269e3021894 17 #include "hal/ticker_api.h"
elessair 0:f269e3021894 18 #include "hal/us_ticker_api.h"
elessair 0:f269e3021894 19 #include "platform/critical.h"
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 namespace mbed {
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
elessair 0:f269e3021894 24 reset();
elessair 0:f269e3021894 25 }
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
elessair 0:f269e3021894 28 reset();
elessair 0:f269e3021894 29 }
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 void Timer::start() {
elessair 0:f269e3021894 32 core_util_critical_section_enter();
elessair 0:f269e3021894 33 if (!_running) {
elessair 0:f269e3021894 34 _start = ticker_read(_ticker_data);
elessair 0:f269e3021894 35 _running = 1;
elessair 0:f269e3021894 36 }
elessair 0:f269e3021894 37 core_util_critical_section_exit();
elessair 0:f269e3021894 38 }
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 void Timer::stop() {
elessair 0:f269e3021894 41 core_util_critical_section_enter();
elessair 0:f269e3021894 42 _time += slicetime();
elessair 0:f269e3021894 43 _running = 0;
elessair 0:f269e3021894 44 core_util_critical_section_exit();
elessair 0:f269e3021894 45 }
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 int Timer::read_us() {
elessair 0:f269e3021894 48 core_util_critical_section_enter();
elessair 0:f269e3021894 49 int time = _time + slicetime();
elessair 0:f269e3021894 50 core_util_critical_section_exit();
elessair 0:f269e3021894 51 return time;
elessair 0:f269e3021894 52 }
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 float Timer::read() {
elessair 0:f269e3021894 55 return (float)read_us() / 1000000.0f;
elessair 0:f269e3021894 56 }
elessair 0:f269e3021894 57
elessair 0:f269e3021894 58 int Timer::read_ms() {
elessair 0:f269e3021894 59 return read_us() / 1000;
elessair 0:f269e3021894 60 }
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 int Timer::slicetime() {
elessair 0:f269e3021894 63 core_util_critical_section_enter();
elessair 0:f269e3021894 64 int ret = 0;
elessair 0:f269e3021894 65 if (_running) {
elessair 0:f269e3021894 66 ret = ticker_read(_ticker_data) - _start;
elessair 0:f269e3021894 67 }
elessair 0:f269e3021894 68 core_util_critical_section_exit();
elessair 0:f269e3021894 69 return ret;
elessair 0:f269e3021894 70 }
elessair 0:f269e3021894 71
elessair 0:f269e3021894 72 void Timer::reset() {
elessair 0:f269e3021894 73 core_util_critical_section_enter();
elessair 0:f269e3021894 74 _start = ticker_read(_ticker_data);
elessair 0:f269e3021894 75 _time = 0;
elessair 0:f269e3021894 76 core_util_critical_section_exit();
elessair 0:f269e3021894 77 }
elessair 0:f269e3021894 78
elessair 0:f269e3021894 79 Timer::operator float() {
elessair 0:f269e3021894 80 return read();
elessair 0:f269e3021894 81 }
elessair 0:f269e3021894 82
elessair 0:f269e3021894 83 } // namespace mbed