mirror of https://github.com/ARMmbed/mbed-os.git
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/Timer.h"
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#include "hal/ticker_api.h"
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#include "hal/us_ticker_api.h"
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#include "platform/mbed_critical.h"
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namespace mbed {
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Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
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reset();
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}
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Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
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reset();
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}
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void Timer::start() {
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core_util_critical_section_enter();
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if (!_running) {
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_start = ticker_read_us(_ticker_data);
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_running = 1;
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}
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core_util_critical_section_exit();
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}
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void Timer::stop() {
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core_util_critical_section_enter();
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_time += slicetime();
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_running = 0;
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core_util_critical_section_exit();
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}
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int Timer::read_us() {
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return read_high_resolution_us();
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}
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float Timer::read() {
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return (float)read_us() / 1000000.0f;
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}
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int Timer::read_ms() {
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return read_high_resolution_us() / 1000;
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}
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us_timestamp_t Timer::read_high_resolution_us() {
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core_util_critical_section_enter();
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us_timestamp_t time = _time + slicetime();
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core_util_critical_section_exit();
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return time;
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}
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us_timestamp_t Timer::slicetime() {
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us_timestamp_t ret = 0;
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core_util_critical_section_enter();
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if (_running) {
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ret = ticker_read_us(_ticker_data) - _start;
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}
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core_util_critical_section_exit();
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return ret;
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}
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void Timer::reset() {
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core_util_critical_section_enter();
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_start = ticker_read_us(_ticker_data);
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_time = 0;
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core_util_critical_section_exit();
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}
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Timer::operator float() {
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return read();
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}
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} // namespace mbed
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