openHASP/lib/Button/Button.cpp

/*
    Button - a small library for Arduino to handle button debouncing
    

    MIT licensed.
*/

#include "Button.h"
#include <Arduino.h>

Button::Button(uint8_t pin) : _pin(pin), _delay(100), _state(HIGH), _ignore_until(0), _has_changed(false)
{}

void Button::begin()
{
    pinMode(_pin, INPUT_PULLUP);
}

//
// public methods
//

bool Button::read()
{
    // ignore pin changes until after this delay time
    if(_ignore_until > millis()) {
        // ignore any changes during this period
    }

    // pin has changed
    else if(digitalRead(_pin) != _state) {
        _ignore_until = millis() + _delay;
        _state        = !_state;
        _has_changed  = true;
    }

    return _state;
}

// has the button been toggled from on -> off, or vice versa
bool Button::toggled()
{
    read();
    return has_changed();
}

// mostly internal, tells you if a button has changed after calling the read() function
bool Button::has_changed()
{
    if(_has_changed == true) {
        _has_changed = false;
        return true;
    }
    return false;
}

// has the button gone from off -> on
bool Button::pressed()
{
    if(read() == PRESSED && has_changed() == true)
        return true;
    else
        return false;
}

// has the button gone from on -> off
bool Button::released()
{
    if(read() == RELEASED && has_changed() == true)
        return true;
    else
        return false;
}