<?php

/*
 * Copyright (C) 2014, NoccyLabs
 * 
 * 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 3 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, see <http://www.gnu.org/licenses/>
 */

namespace NoccyLabs\Gpio\Util;

use NoccyLabs\Gpio\GpioPin;

class BitmappedGpio
{
    protected $gpio = array();

    public function __construct()
    {
        $this->gpio = array_fill(0,7,null);
    }
    
    public function setGpioPin($bit, GpioPin $gpiopin = null)
    {
        if (($bit >= 0) && ($bit <= 7)) {
            $this->gpio[$bit] = $gpiopin;
        } else {
            throw new \Exception("bit must be 0-7");
        }
    }
    
    public function read()
    {
        $r = 0;
        foreach($this->gpio as $bit=>$gpio) {
            if ($gpio->getValue()) { $r |= 1<<$bit; }
        }
        return $r;
    }
    
    public function write($byte)
    {
        $r = 0;
        foreach($this->gpio as $bit=>$gpio) {
            if ($gpio) {
                $gpio->setValue((bool)($byte & (1<<$bit)));
            }
        }
        return $this;
    }
    
    
}