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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.
*/
#include <time.h>
#include <stdlib.h>
#include "timer.hpp"
#define MS_PER_SECOND 1000
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()
: frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
{}
frequency_clock_t::frequency_clock_t(float frequency)
: frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
{}
/// @brief Return the period in ms given the frequency in hertz.
float frequency_clock_t::frequency_to_period(float frequency)
{
return 1 / frequency * MS_PER_SECOND;
}
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_ms;
}
bool frequency_clock_t::elapsed(bool stagger)
{
float period = frequency_to_period(frequency_);
float elapsed_time = 0;
if(!started() && stagger)
last_tick_ = get_time_function()() - (rand() % int(period));
else
// Make sure it ticks the the first call
elapsed_time = !started() ? period : get_time_function()() - 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()
{
last_tick_ = get_time_function()();
}
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