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/*
* 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 startup) 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);
};
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