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This bundle wraps Pi4j (http://pi4j.com) that wraps the native code Wiring Pi (http://wiringpi.com). It wraps these libraries to make them OSGi friendly and allow them to work together with the OSGi enRoute IoT circuit library (osgi.enroute.iot.circuit). The bundle will first use Pi4J to detect on what hardware it runs. If it runs on an appropriate type, it will register a component that can be configured with Metatype. The Metatype defines a full blown configuration template for all the Pi's functions. The GPIO's are registered as components for the circuit. Regardless of the success of the configuration, this bundle will also register a GpioController service, which is the main Pi4J class.

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package com.pi4j.wiringpi;

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Library (Core)
 * FILENAME      :  Nes.java  
 * 
 * This file is part of the Pi4J project. More information about 
 * this project can be found here:  http://www.pi4j.com/
 * **********************************************************************
 * %%
 * Copyright (C) 2012 - 2015 Pi4J
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */


import com.pi4j.util.NativeLibraryLoader;

/**
 * 
 * Before using the Pi4J library, you need to ensure that the Java VM in configured with access to
 * the following system libraries:
 * 

 * pi4j
 * wiringPi
 * 
 *  This library depends on the wiringPi native system library.
 (developed by
 * Gordon Henderson @ http://wiringpi.com/)
 * 
 * 
 * 
 * @see http://www.pi4j.com/
 * @see http://wiringpi.com/dev-lib/
 * @author Robert Savage (http://www.savagehomeautomation.com)
 */
public class Nes {

    public static final int NES_RIGHT = 0x01;
    public static final int NES_LEFT = 0x02;
    public static final int NES_DOWN = 0x04;
    public static final int NES_UP = 0x08;
    public static final int NES_START = 0x10;
    public static final int NES_SELECT = 0x20;
    public static final int NES_B = 0x40;
    public static final int NES_A = 0x80;
    public static final int PULSE_TIME = 25;
    public static final int MAX_NES_JOYSTICKS = 8;

    // private constructor 
    private Nes() {
        // forbid object construction 
    }
    
    static {
        // Load the platform library
        NativeLibraryLoader.load("libpi4j.so");
    }

    /**
     * setupNesJoystick:
     * 
     * Create a new NES joystick interface, program the pins, etc.
     * 
     * @param dPin data pin
     * @param cPin clock pin
     * @param lPin pin number
     * @return return joystick handle
     */
    public static native int setupNesJoystick(int dPin, int cPin, int lPin);

    /**
     * readNesJoystick:
     * 
     * Do a single scan of the NES Joystick.
     * 
     * @param joystick joystick handle
     * @return return value
     */
    public static native int readNesJoystick(int joystick);
}