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/*
* #%L
* **********************************************************************
ORGANIZATION : Pi4J
PROJECT : Pi4J :: Java Examples
FILENAME : MultipurposePinGpioExample.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 - 2018 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.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalMultipurpose;
import com.pi4j.io.gpio.PinMode;
import com.pi4j.io.gpio.PinPullResistance;
import com.pi4j.io.gpio.RaspiPin;
import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
import com.pi4j.io.gpio.event.GpioPinListenerDigital;
/**
* This example code demonstrates how to setup a multi-purpose
* digital pin on the Raspberry Pi.
*
* @author Robert Savage
*/
public class MultipurposePinGpioExample {
public static void main(String args[]) throws InterruptedException {
System.out.println("<--Pi4J--> GPIO Multipurpose Pin Example ... started.");
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// provision gpio pin #02 as an multi-purpose pin configured as an input
// pin by default with its internal pull down resistor enabled
final GpioPinDigitalMultipurpose pin = gpio.provisionDigitalMultipurposePin(RaspiPin.GPIO_02, PinMode.DIGITAL_INPUT, PinPullResistance.PULL_DOWN);
// create and register gpio pin listener
pin.addListener(new GpioPinListenerDigital() {
@Override
public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
// display pin state on console
System.out.println(" --> GPIO PIN STATE CHANGE: " + event.getPin() + " = " + event.getState());
}
});
System.out.println(" ... complete the GPIO #02 circuit and see the listener feedback here in the console.");
// keep program running until user aborts (CTRL-C)
while(true){
Thread.sleep(5000);
// here we want to control the multi-purpose GPIO pin
// so we must reconfigure the pin mode first
pin.setMode(PinMode.DIGITAL_OUTPUT);
// perform the pin output operation
System.out.println(" --> GPIO PIN - RECONFIGURED AS OUPUT PIN");
pin.pulse(1000, true);
// reconfigure the pin back to an input pin
pin.setMode(PinMode.DIGITAL_INPUT);
System.out.println(" --> GPIO PIN - RECONFIGURED AS INPUT PIN");
}
// 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(); <--- implement this method call if you wish to terminate the Pi4J GPIO controller
}
}
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