121 lines
3.1 KiB
PHP
121 lines
3.1 KiB
PHP
<?php
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/*
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* Copyright (C) 2014, NoccyLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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namespace NoccyLabs\Gpio;
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use NoccyLabs\Gpio\Exception\HardwareException;
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class Gpio implements \ArrayAccess
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{
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// Direction
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const DIR_IN = "in";
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const DIR_OUT = "out";
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// Values
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const VAL_HIGH = 1;
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const VAL_LOW = 0;
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// Edges
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const EDGE_NONE = "none";
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const EDGE_RISING = "rising";
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const EDGE_FALLING = "faling";
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const EDGE_BOTH = "both";
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protected $gpio = array();
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/** @var NoccyLabs\Gpio\GpioMapperInterface */
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protected $mapper;
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protected $dummy;
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public function __construct($dummy=false)
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{
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if (!$dummy) {
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if (!file_exists("/sys/class/gpio")) {
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throw new HardwareException("gpio sysfs is not available");
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}
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if (!is_writable("/sys/class/gpio/export")) {
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throw new HardwareException("gpio sysfs is not writable");
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}
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}
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$this->dummy = $dummy;
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}
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public function setMapper(GpioMapperInterface $mapper=null)
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{
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$this->mapper = $mapper;
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return $this;
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}
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/**
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* Get a pin, optionally via previously specified mapper.
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*
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* @interface ArrayAccess
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* @param int
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*/
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public function offsetGet($index)
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{
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if ($this->mapper) {
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$index = $this->mapper->mapLogicalToGpioPin($index);
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}
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if (empty($this->gpio[$index])) {
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if ($this->dummy) {
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$gpio = new DummyGpioPin($index, $this);
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} else {
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$gpio = new GpioPin($index, $this);
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}
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$this->gpio[$index] = $gpio;
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}
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return $this->gpio[$index];
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}
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/**
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* Check if a GPIO is exported
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*
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* @interface ArrayAccess
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* @param int
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*/
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public function offsetExists($index)
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{
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return array_key_exists($index, $this->gpio);
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}
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/**
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* Not callable, get the requested pin via offsetGet() instead.
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*
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* @interface ArrayAccess
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* @throws Exception
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* @param int
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* @param mixed
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*/
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public function offsetSet($index,$value)
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{ throw new \Exception(); }
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/**
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* Unlink and unexport an exported GPIO
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*
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* @interface ArrayAccess
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* @param int
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*/
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public function offsetUnset($index)
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{
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$this->gpio[$index]->unexport();
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unset($this->gpio[$index]);
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}
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}
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