/* mbed Microcontroller Library * Copyright (c) 2006-2019 ARM Limited * SPDX-License-Identifier: Apache-2.0 * * 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. */ #ifndef MBED_LOWPOWERCLOCK_H #define MBED_LOWPOWERCLOCK_H #include <chrono> #if DEVICE_LPTICKER #include "hal/lp_ticker_api.h" namespace mbed { /** * \defgroup drivers_LowPowerClock LowPowerClock class * \ingroup drivers-public-api-ticker * @{ */ /** * A C++11 Clock representing the HAL lp_ticker. * * Dummy lock/unlock methods are provided to have the same generic API * as UnlockedHighPowerClock. No action is required as the lp_ticker * runs continuously. */ class LowPowerClock { public: /* duration is C++11 standard microseconds, so representation will be 64-bit signed integer */ using duration = std::chrono::microseconds; using rep = duration::rep; using period = duration::period; using time_point = std::chrono::time_point<LowPowerClock>; static const bool is_steady = true; /** Read the current time */ static time_point now() { return time_point{duration{ticker_read_us(get_lp_ticker_data())}}; } /** Lock the clock to ensure it stays running; dummy for API compatibility with HighResClock */ static void lock() { } /** Unlock the clock, allowing it to stop during power saving; dummy for API compatibility with HighResClock */ static void unlock() { } }; /** @}*/ } #endif /* DEVICE_LPTICKER */ #endif /* MBED_LOWPOWERCLOCK_H */