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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      :  SerialExample.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.serial.*;
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 java.io.IOException;
import java.util.Date;

/**
 * This example code demonstrates how to perform serial communications using the BananaPi.
 * (see 'BananaPiSerial' for constant definitions for BananaPi Serial Port addresses.)
 *
 * @author Robert Savage
 */
public class SerialExample {

    /**
     * This example program supports the following optional command arguments/options:
     *   "--device (device-path)"                   [DEFAULT: /dev/ttyAMA0]
     *   "--baud (baud-rate)"                       [DEFAULT: 38400]
     *   "--data-bits (5|6|7|8)"                    [DEFAULT: 8]
     *   "--parity (none|odd|even)"                 [DEFAULT: none]
     *   "--stop-bits (1|2)"                        [DEFAULT: 1]
     *   "--flow-control (none|hardware|software)"  [DEFAULT: none]
     *
     * @param args
     * @throws InterruptedException
     * @throws IOException
     */
    public static void main(String args[]) throws InterruptedException, IOException, 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 -->", "Serial Communication Example");

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

        // create an instance of the serial communications class
        final Serial serial = SerialFactory.createInstance();

        // create and register the serial data listener
        serial.addListener(new SerialDataEventListener() {
            @Override
            public void dataReceived(SerialDataEvent event) {

                // NOTE! - It is extremely important to read the data received from the
                // serial port.  If it does not get read from the receive buffer, the
                // buffer will continue to grow and consume memory.

                // print out the data received to the console
                try {
                    console.println("[HEX DATA]   " + event.getHexByteString());
                    console.println("[ASCII DATA] " + event.getAsciiString());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        try {
            // create serial config object
            SerialConfig config = new SerialConfig();

            // set default serial settings (device, baud rate, flow control, etc)
            //
            // by default, use the DEFAULT com port on the BananaPi (exposed on GPIO header)
            // see 'BananaPiSerial' for constant definitions for BananaPi Serial Port addresses.
            //
            // NOTE: this utility method will determine the default serial port for the
            //       detected platform and board/model.
            config.device(BananaPiSerial.DEFAULT_COM_PORT)  // TX is located at CON3-08; RX is located at CON3-10
                    .baud(Baud._38400)
                    .dataBits(DataBits._8)
                    .parity(Parity.NONE)
                    .stopBits(StopBits._1)
                    .flowControl(FlowControl.NONE);

            // parse optional command argument options to override the default serial settings.
            if(args.length > 0){
                config = CommandArgumentParser.getSerialConfig(config, args);
            }

            // display connection details
            console.box(" Connecting to: " + config.toString(),
                    " We are sending ASCII data on the serial port every 1 second.",
                    " Data received on serial port will be displayed below.");


            // open the default serial device/port with the configuration settings
            serial.open(config);

            // continuous loop to keep the program running until the user terminates the program
            while(console.isRunning()) {
                try {
                    // write a formatted string to the serial transmit buffer
                    serial.write("CURRENT TIME: " + new Date().toString());

                    // write a individual bytes to the serial transmit buffer
                    serial.write((byte) 13);
                    serial.write((byte) 10);

                    // write a simple string to the serial transmit buffer
                    serial.write("Second Line");

                    // write a individual characters to the serial transmit buffer
                    serial.write('\r');
                    serial.write('\n');

                    // write a string terminating with CR+LF to the serial transmit buffer
                    serial.writeln("Third Line");
                }
                catch(IllegalStateException ex){
                    ex.printStackTrace();
                }

                // wait 1 second before continuing
                Thread.sleep(1000);
            }

        }
        catch(IOException ex) {
            console.println(" ==>> SERIAL SETUP FAILED : " + ex.getMessage());
            return;
        }
    }
}