/* * 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. */ #include <time.h> #include <stdlib.h> #include <cmath> #include "timer.hpp" long long int system_time_us() { struct timespec t_usec; long long int timestamp_usec; if(!::clock_gettime(CLOCK_MONOTONIC, &t_usec)) timestamp_usec = (t_usec.tv_nsec / 1000ll) + (t_usec.tv_sec* 1000000ll); return timestamp_usec; } long long int system_time_ms() { struct timespec t_msec; long long int timestamp_msec; if(!::clock_gettime(CLOCK_MONOTONIC, &t_msec)) timestamp_msec = (t_msec.tv_nsec / 1000000ll) + (t_msec.tv_sec* 1000ll); return timestamp_msec; } long long int system_time_s() { struct timespec t_sec; long long int timestamp_sec; if(!::clock_gettime(CLOCK_MONOTONIC, &t_sec)) timestamp_sec = t_sec.tv_sec; return timestamp_sec; } frequency_clock_t::frequency_clock_t() : unit_{1000000}, frequency_{10.0}, last_tick_{0}, time_function_{nullptr} {} frequency_clock_t::frequency_clock_t(float frequency) : unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr} { if(frequency_ <= 0) frequency_ = 1; } frequency_clock_t::frequency_clock_t(float frequency, uint64_t last_tick, time_function_t time_function) : unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr} { if(frequency_ <= 0) frequency_ = 1; } /// @brief Return the period in ms given the frequency in hertz. /// @param[in] frequency - Frequency to convert, in hertz float frequency_clock_t::frequency_to_period() const { return frequency_ == 0 ? 0 : 1 / frequency_; } const struct timeval frequency_clock_t::get_timeval_from_period() const { struct timeval freq = {0, 0}; float f; freq.tv_usec = (long int)(std::modf(frequency_to_period(), &f) * unit_); freq.tv_sec = (time_t)f; return freq; } bool frequency_clock_t::started() { return last_tick_ != 0; } time_function_t frequency_clock_t::get_time_function() { return time_function_ != nullptr ? time_function_ : system_time_us; } bool frequency_clock_t::elapsed(bool stagger) { float period = frequency_to_period(); float elapsed_time = 0; if(!started() && stagger) last_tick_ = get_time_function()() - (rand() % int(period)); // Make sure it ticks the the first call elapsed_time = !started() ? period : (float)get_time_function()() - (float)last_tick_; return frequency_ == 0 || elapsed_time >= period; } float frequency_clock_t::get_frequency() const { return frequency_; } /// @brief Force the clock to tick, regardless of it its time has actually /// elapsed. void frequency_clock_t::tick(uint64_t timestamp) { last_tick_ = timestamp; }