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drivers/Timer.cpp
- Committer:
- AnnaBridge
- Date:
- 2017-10-02
- Revision:
- 175:b96e65c34a4d
- Parent:
- 168:e84263d55307
- Child:
- 176:af195413fb11
File content as of revision 175:b96e65c34a4d:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "drivers/Timer.h" #include "hal/ticker_api.h" #include "hal/us_ticker_api.h" #include "platform/mbed_critical.h" namespace mbed { Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) { reset(); } Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) { reset(); } void Timer::start() { core_util_critical_section_enter(); if (!_running) { sleep_manager_lock_deep_sleep(); _start = ticker_read_us(_ticker_data); _running = 1; } core_util_critical_section_exit(); } void Timer::stop() { core_util_critical_section_enter(); _time += slicetime(); if (_running) { sleep_manager_unlock_deep_sleep(); } _running = 0; core_util_critical_section_exit(); } int Timer::read_us() { return read_high_resolution_us(); } float Timer::read() { return (float)read_us() / 1000000.0f; } int Timer::read_ms() { return read_high_resolution_us() / 1000; } us_timestamp_t Timer::read_high_resolution_us() { core_util_critical_section_enter(); us_timestamp_t time = _time + slicetime(); core_util_critical_section_exit(); return time; } us_timestamp_t Timer::slicetime() { us_timestamp_t ret = 0; core_util_critical_section_enter(); if (_running) { ret = ticker_read_us(_ticker_data) - _start; } core_util_critical_section_exit(); return ret; } void Timer::reset() { core_util_critical_section_enter(); _start = ticker_read_us(_ticker_data); _time = 0; core_util_critical_section_exit(); } Timer::operator float() { return read(); } } // namespace mbed