mraa/examples/java/BlinkOnboard.java

import mraa.Dir;
import mraa.Gpio;
import mraa.Platform;
import mraa.mraa;

/*
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Copyright (c) 2014 Intel Corporation.
 * Author: Jakub Kramarz <jkramarz@virtuslab.com>
 * Copyright (c) 2015 VirtusLab
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

public class BlinkOnboard {
    static {
        try {
            System.loadLibrary("mraajava");
        } catch (UnsatisfiedLinkError e) {
            System.err.println(
                    "Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" +
                            e);
            System.exit(1);
        }
    }
    public static void main(String argv[]) throws InterruptedException {
        Platform platform = mraa.getPlatformType();
        Gpio gpio, gpio_in;
        if (platform == Platform.INTEL_GALILEO_GEN1) {
            gpio = new Gpio(3);
        } else if (platform == Platform.INTEL_MINNOWBOARD_MAX) {
            gpio = new Gpio(21);
        } else {
            gpio = new Gpio(13);
        }
        System.out.format("Welcome to libmraa\n Version: %s\n Running on %s\n",
                mraa.getVersion(), platform.toString());

        gpio.dir(Dir.DIR_OUT);
        // on platforms with physical button use gpio_in
        if (platform == Platform.INTEL_MINNOWBOARD_MAX) {
            gpio_in = new Gpio(14);
            gpio_in.dir(Dir.DIR_IN);
            System.out.println("Press and hold S1 to stop, Press SW1 to shutdown!");
        } else {
            gpio_in = null;
        }

        boolean state = false;
        while (true) {
            if (gpio_in != null && gpio_in.read() == 0) {
                return;
            }
            if (state) {
                state = false;
                gpio.write(1);
            } else {
                state = true;
                gpio.write(0);
            }
            Thread.sleep(1000);
        }
    }
}