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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 <stdlib.h>
#include "timer.hpp"
#define MS_PER_SECOND 1000
long long int system_time_ms()
{
struct timeb t_msec;
long long int timestamp_msec;
if(!::ftime(&t_msec))
{
timestamp_msec = (t_msec.time) * 1000ll +
t_msec.millitm;
}
return timestamp_msec;
}
frequency_clock_t::frequency_clock_t()
: frequency_{0.0}, 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 to conditionalTick(...)
elapsed_time = !started() ? period : get_time_function()() - last_tick_;
return frequency_ == 0 || elapsed_time >= period;
}
/// @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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