/* * Copyright (C) 2015, 2016 "IoT.bzh" * Author "Romain Forlot" <romain.forlot@iot.bzh> * * 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. */ #pragma once #include <sys/time.h> #include <stdint.h> /// @brief return epoch in milliseconds /// /// @return long long int epoch in milliseconds typedef long long int (*time_function_t)(); long long int system_time_us(); long long int system_time_ms(); long long int system_time_s(); /// @brief A frequency counting clock. /// Utility class allowing some time function. class frequency_clock_t { private: float unit_; ///< unit_ - multiplicator to make operation to be in the right unit (milli, micro, nano, etc) float frequency_; ///< the clock frequency in Hz. uint64_t last_tick_; ///< the last time (in microseconds since epoch) that the clock ticked. time_function_t time_function_; ///< a function returning current time public: frequency_clock_t(); explicit frequency_clock_t(float frequency); frequency_clock_t(float frequency, uint64_t last_tick, time_function_t time_function); float get_frequency() const; const struct timeval get_timeval_from_period() const; float frequency_to_period() const; bool started(); time_function_t get_time_function(); bool elapsed(bool stagger); uint64_t get_last_tick() const; void tick(uint64_t timestamp); };