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Pi4J Java Examples using the Pi4J Library
There is a newer version: 1.4
package bananapi;
/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Examples
 * FILENAME      :  PwmExample.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 - 2016 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.io.gpio.BananaPiPin;
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinPwmOutput;
import com.pi4j.platform.Platform;
import com.pi4j.platform.PlatformAlreadyAssignedException;
import com.pi4j.platform.PlatformManager;
import com.pi4j.util.Console;

/**
 * 
 * This example code demonstrates how to setup a hardware supported PWM pin GpioProvider
 * on the BananaPi platform.
 * 
 *
 * @author Robert Savage
 */
public class PwmExample {
    /**
     * @param args the command line arguments
     * @throws InterruptedException
     */
    public static void main(String[] args) throws InterruptedException, PlatformAlreadyAssignedException {

        // ####################################################################
        //
        // since we are not using the default Raspberry Pi platform, we should
        // explicitly assign the platform as the BananaPi platform.
        //
        // ####################################################################
        PlatformManager.setPlatform(Platform.BANANAPI);

        // create Pi4J console wrapper/helper
        // (This is a utility class to abstract some of the boilerplate code)
        final Console console = new Console();

        // print program title/header
        console.title("<-- The Pi4J Project -->", "PWM Example");

        // allow for user to exit program using CTRL-C
        console.promptForExit();

        // create GPIO controller instance
        GpioController gpio = GpioFactory.getInstance();

        // ####################################################################
        //
        // When provisioning a pin, use the BananaPiPin class.
        //
        // ####################################################################

        // the BananaPi supports a single hardware PWM pin on GPIO_07
        GpioPinPwmOutput pwm = gpio.provisionPwmOutputPin(BananaPiPin.GPIO_07);

        // set the PWM rate to 500
        pwm.setPwm(500);
        console.println("PWM rate is: " + pwm.getPwm());

        console.println("Press ENTER to set the PWM to a rate of 250");
        System.console().readLine();

        // set the PWM rate to 250
        pwm.setPwm(250);
        console.println("PWM rate is: " + pwm.getPwm());


        console.println("Press ENTER to set the PWM to a rate to 0 (stop PWM)");
        System.console().readLine();

        // set the PWM rate to 0
        pwm.setPwm(0);
        console.println("PWM rate is: " + pwm.getPwm());

        // stop all GPIO activity/threads by shutting down the GPIO controller
        // (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
        gpio.shutdown();
    }
}