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odroid.xu4.GpioInputAllExample Maven / Gradle / Ivy
package odroid.xu4;
/*
* #%L
* **********************************************************************
ORGANIZATION : Pi4J
PROJECT : Pi4J :: Java Examples
FILENAME : GpioInputAllExample.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.*;
import com.pi4j.platform.Platform;
import com.pi4j.platform.PlatformAlreadyAssignedException;
import com.pi4j.platform.PlatformManager;
import com.pi4j.util.CommandArgumentParser;
import com.pi4j.util.Console;
import com.pi4j.util.ConsoleColor;
import java.util.ArrayList;
import java.util.List;
/**
* This example code demonstrates how to perform simple GPIO
* pin state reading on the Odroid XU4 platform fro all pins.
*
* @author Robert Savage
*/
public class GpioInputAllExample {
/**
* [ARGUMENT/OPTION "--pull (up|down|off)" | "-l (up|down|off)" | "--up" | "--down" ]
* This example program accepts an optional argument for specifying pin pull resistance.
* Supported values: "up|down" (or simply "1|0"). If no value is specified in the command
* argument, then the pin pull resistance will be set to PULL_UP by default.
* -- EXAMPLES: "--pull up", "-pull down", "--pull off", "--up", "--down", "-pull 0", "--pull 1", "-l up", "-l down".
*
* @param args
* @throws InterruptedException
* @throws PlatformAlreadyAssignedException
*/
public static void main(String[] args) throws InterruptedException, PlatformAlreadyAssignedException {
// ####################################################################
//
// !!!!! ATTENTION !!!!! ALL GPIO PINS ON ODROID-XU4 ARE 1.8VDC.
//
// THIS MEANS THAT YOU MUST USE A LEVEL SHIFTER IF USING WITH A 3.3VDC/5VDC CIRCUIT.
// YOU CAN USE THE OPTIONAL ODROID XU4-SHIFTER SHIELD TO PERFORM THE LEVEL SHIFTING:
// http://www.hardkernel.com/main/products/prdt_info.php?g_code=G143556253995
//
// ####################################################################
// ####################################################################
//
// since we are not using the default Raspberry Pi platform, we should
// explicitly assign the platform as the Odroid platform.
//
// ####################################################################
PlatformManager.setPlatform(Platform.ODROID);
// 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 -->", "GPIO Input (ALL PINS) Example");
// allow for user to exit program using CTRL-C
console.promptForExit();
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// by default we will use gpio pin PULL-UP; however, if an argument
// has been provided, then use the specified pull resistance
PinPullResistance pull = CommandArgumentParser.getPinPullResistance(
PinPullResistance.PULL_UP, // default pin pull resistance if no pull argument found
args); // argument array to search in
// ####################################################################
//
// IF YOU ARE USING AN ODROID XU4 PLATFORM, THEN ...
// When provisioning a pin, use the OdroidXU4Pin class.
//
// ####################################################################
List provisionedPins = new ArrayList<>();
// provision all pins that support digital inputs
for (Pin pin : OdroidXU4Pin.allPins(PinMode.DIGITAL_INPUT)) {
try {
GpioPinDigitalInput provisionedPin = gpio.provisionDigitalInputPin(pin, pull);
provisionedPin.setShutdownOptions(true); // unexport pin on program shutdown
provisionedPins.add(provisionedPin); // add provisioned pin to collection
}
catch (Exception ex){
System.err.println(ex.getMessage());
}
}
// prompt user that we are ready
console.println(" ... Successfully provisioned all GPIO input pins");
console.emptyLine();
console.box("The GPIO input pins states will be displayed below.");
console.emptyLine();
// display pin states for all pins
for(GpioPinDigitalInput input : provisionedPins) {
console.println(" [" + input.toString() + "] digital state is: " + ConsoleColor.conditional(
input.getState().isHigh(), // conditional expression
ConsoleColor.GREEN, // positive conditional color
ConsoleColor.RED, // negative conditional color
input.getState()));
}
// 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();
}
}
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