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Timer.cpp
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Timer.cpp
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * *
Code by Simon Monk
http://www.simonmonk.org
* * * * * * * * * * * * * * * * * * * * * * * * * * * * */
// For Arduino 1.0 and earlier
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include "Timer.h"
Timer::Timer(void)
{
}
int8_t Timer::every(unsigned long period, void (*callback)(), int repeatCount)
{
int8_t i = findFreeEventIndex();
if (i == -1) return -1;
_events[i].eventType = EVENT_EVERY;
_events[i].period = period;
_events[i].repeatCount = repeatCount;
_events[i].callback = callback;
_events[i].lastEventTime = millis();
_events[i].count = 0;
return i;
}
int8_t Timer::every(unsigned long period, void (*callback)())
{
return every(period, callback, -1); // - means forever
}
int8_t Timer::after(unsigned long period, void (*callback)())
{
return every(period, callback, 1);
}
int8_t Timer::oscillate(uint8_t pin, unsigned long period, uint8_t startingValue, int repeatCount)
{
int8_t i = findFreeEventIndex();
if (i == NO_TIMER_AVAILABLE) return NO_TIMER_AVAILABLE;
_events[i].eventType = EVENT_OSCILLATE;
_events[i].pin = pin;
_events[i].period = period;
_events[i].pinState = startingValue;
digitalWrite(pin, startingValue);
_events[i].repeatCount = repeatCount * 2; // full cycles not transitions
_events[i].lastEventTime = millis();
_events[i].count = 0;
return i;
}
int8_t Timer::oscillate(uint8_t pin, unsigned long period, uint8_t startingValue)
{
return oscillate(pin, period, startingValue, -1); // forever
}
/**
* This method will generate a pulse of !startingValue, occuring period after the
* call of this method and lasting for period. The Pin will be left in !startingValue.
*/
int8_t Timer::pulse(uint8_t pin, unsigned long period, uint8_t startingValue)
{
return oscillate(pin, period, startingValue, 1); // once
}
/**
* This method will generate a pulse of startingValue, starting immediately and of
* length period. The pin will be left in the !startingValue state
*/
int8_t Timer::pulseImmediate(uint8_t pin, unsigned long period, uint8_t pulseValue)
{
int8_t id(oscillate(pin, period, pulseValue, 1));
// now fix the repeat count
if (id >= 0 && id < MAX_NUMBER_OF_EVENTS) {
_events[id].repeatCount = 1;
}
return id;
}
void Timer::stop(int8_t id)
{
if (id >= 0 && id < MAX_NUMBER_OF_EVENTS) {
_events[id].eventType = EVENT_NONE;
}
}
void Timer::update(void)
{
unsigned long now = millis();
update(now);
}
void Timer::update(unsigned long now)
{
for (int8_t i = 0; i < MAX_NUMBER_OF_EVENTS; i++)
{
if (_events[i].eventType != EVENT_NONE)
{
_events[i].update(now);
}
}
}
int8_t Timer::findFreeEventIndex(void)
{
for (int8_t i = 0; i < MAX_NUMBER_OF_EVENTS; i++)
{
if (_events[i].eventType == EVENT_NONE)
{
return i;
}
}
return NO_TIMER_AVAILABLE;
}