Added software spi stuff

lib/Bus/Bus.php

@@ -0,0 +1,64 @@
+<?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\Bus;
+
+abstract class Bus implements BusInterface
+{
+    protected $pins = array();
+
+    public function __construct()
+    {
+        $this->configure();
+    }
+    
+    public function addPin($name)
+    {
+        $this->pins[$name] = null;
+    }
+    
+    public function __set($name, $value)
+    {
+        if (!array_key_exists($name,$this->pins)) {
+            throw new \Exception("No such pin: {$name}");
+        }
+        $this->pins[$name] = $value;
+    }
+    
+    public function __get($name)
+    {
+        if (!array_key_exists($name,$this->pins)) {
+            throw new \Exception("No such pin: {$name}");
+        }
+        return $this->pins[$name];
+    }
+
+    public function __isSet($name)
+    {
+        return array_key_exists($name,$this->pins);
+    }
+    
+    public function __unset($name)
+    {
+        if (!array_key_exists($name,$this->pins)) {
+            return;
+        }
+        $this->pins[$name] = null;
+    }
+}