BlinkLED.cpp

/*
 * Copyright (C) 2012 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "BlinkLED.h"
#if defined(ARDUINO) && ARDUINO >= 100
#include <Arduino.h>
#else
#include <WProgram.h>
#endif

BlinkLED::BlinkLED(uint8_t pin, unsigned long onTime, unsigned long offTime, bool initialState)
    : _pin(pin)
    , _state(initialState)
    , _paused(false)
    , _onTime(onTime)
    , _offTime(offTime)
{
    pinMode(pin, OUTPUT);
    digitalWrite(pin, initialState ? HIGH : LOW);
    _lastChange = millis();
}

void BlinkLED::loop()
{
    if (_paused)
        return;
    unsigned long currentTime = millis();
    if (_state) {
        if ((currentTime - _lastChange) >= _onTime) {
            digitalWrite(_pin, LOW);
            _lastChange += _onTime;
            _state = false;
        }
    } else {
        if ((currentTime - _lastChange) >= _offTime) {
            digitalWrite(_pin, HIGH);
            _lastChange += _offTime;
            _state = true;
        }
    }
}

void BlinkLED::setBlinkRate(unsigned long onTime, unsigned long offTime)
{
    _onTime = onTime;
    _offTime = offTime;
}

void BlinkLED::setState(bool state)
{
    if (_state != state) {
        digitalWrite(_pin, state ? HIGH : LOW);
        _state = state;
        _lastChange = millis();
    }
}

void BlinkLED::resume()
{
    if (_paused) {
        _paused = false;
        unsigned long currentTime = millis();
        if (_state) {
            if ((currentTime - _lastChange) >= _onTime) {
                digitalWrite(_pin, LOW);
                _lastChange = currentTime;
                _state = false;
            }
        } else {
            if ((currentTime - _lastChange) >= _offTime) {
                digitalWrite(_pin, HIGH);
                _lastChange = currentTime;
                _state = true;
            }
        }
    }
}