WiringPiGpioExample.java

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Examples
 * FILENAME      :  WiringPiGpioExample.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 - 2013 Pi4J
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
import com.pi4j.wiringpi.Gpio;
import com.pi4j.wiringpi.GpioUtil;

public class WiringPiGpioExample {
    
    // Simple sequencer data
    // Triplets of LED, On/Off and delay

    private static final int data[] = { 
            0, 1, 1, 1, 1, 1, 0, 0, 0, 2, 1, 1, 1, 0, 0, 3, 1, 1, 2, 0, 0, 4, 1, 1, 3, 0, 0, 5, 1, 1, 4,
            0, 0, 6, 1, 1, 5, 0, 0, 7, 1, 1, 6, 0, 1, 7, 0, 1,
            0, 0,
            1, // Extra delay
            // Back again
            7, 1, 1, 6, 1, 1, 7, 0, 0, 5, 1, 1, 6, 0, 0, 4, 1, 1, 5, 0, 0, 3, 1, 1, 4, 0, 0, 2, 1,
            1, 3, 0, 0, 1, 1, 1, 2, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1,
            0, 0, 1, // Extra delay
            9, 9, 9, // End marker
    };

    public static void main(String args[]) throws InterruptedException {
        int pin;
        int dataPtr;
        int l, s, d;
        
        System.out.println("<--Pi4J--> GPIO test program");

        // setup wiringPi
        if (Gpio.wiringPiSetup() == -1) {
            System.out.println(" ==>> GPIO SETUP FAILED");
            return;
        }

        // set GPIO 4 as the input trigger 
        GpioUtil.export(7, GpioUtil.DIRECTION_IN);
        GpioUtil.setEdgeDetection(7, GpioUtil.EDGE_BOTH);
        Gpio.pinMode (7, Gpio.INPUT) ;  
        Gpio.pullUpDnControl(7, Gpio.PUD_DOWN);        

        // set all other GPIO as outputs
        for (pin = 0; pin < 7; ++pin) {
            // export all the GPIO pins that we will be using
            GpioUtil.export(pin, GpioUtil.DIRECTION_OUT);            
            Gpio.pinMode(pin, Gpio.OUTPUT);
        }
        
        dataPtr = 0;
        for (;;) {
            l = data[dataPtr++]; // LED
            s = data[dataPtr++]; // State
            d = data[dataPtr++]; // Duration (10ths)

            if ((l + s + d) == 27) {
                dataPtr = 0;
                continue;
            }

            Gpio.digitalWrite(l, s);
            
            if (Gpio.digitalRead(7) == 1) // Pressed as our switch shorts to ground
                Gpio.delay(d * 10); // Faster!
            else
                Gpio.delay(d * 100);
        }
    }
}