Feedback Help

[Scott Eric Catalano]

Hello Group!

I have changed the scope of my project and I can successfully connect to the arduino I can send data and receive data just fine. How ever I am having an issue with using the incoming data. Based on the code below I sent a command to the arduino and it acknowledges the command and issues feedback in the form of "OFF and ON". Now I am trying to use the feedback ON/OFF to trigger other events. However that is where I am stuck. Thanks for the help!

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent; 
import gnu.io.SerialPortEventListener; 
import java.util.Enumeration;
import java.io.BufferedReader;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TwoWaySerialCommTwo
{
	
    public TwoWaySerialCommTwo()
    {
        super();
    }
    
    void connect ( String portName ) throws Exception
    {
        CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
        if ( portIdentifier.isCurrentlyOwned() )
        {
            System.out.println("Error: Port is currently in use");
        }
        else
        {
            CommPort commPort = portIdentifier.open(this.getClass().getName(),2000);
            
            if ( commPort instanceof SerialPort )
            {
                SerialPort serialPort = (SerialPort) commPort;
                serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
                
                InputStream in = serialPort.getInputStream();
                OutputStream out = serialPort.getOutputStream();
                
                (new Thread(new SerialReader(in))).start();
                (new Thread(new SerialWriter(out))).start();

            }
            else
            {
                System.out.println("Error: Only serial ports are handled by this example.");
            }
        }     
    }
    
    /** */
    public static class SerialReader implements Runnable 
    {
        InputStream in;
        
        public SerialReader ( InputStream in )
        {
            this.in = in;
        }
        
        public void run ()
        {
            byte[] buffer = new byte[1024];
            int len = -1;
			try
            {
                while ( ( len = this.in.read(buffer)) > -1 )
				{
					// TEST
					if (in.equals("OFF") {
                                          System.out.println("ACK");
                                           } // THIS IS WHERE I AM HAVING TROUBLE
					
					// TEST
                    System.out.print(new String(buffer,0,len));
					
                }
				
            }
            catch ( IOException e )
            {
                e.printStackTrace();
            }            
        }
    }

    /** */
    public static class SerialWriter implements Runnable 
    {
        OutputStream out;
        
        public SerialWriter ( OutputStream out )
        {
            this.out = out;
        }
        
        public void run ()
        {
            try
            {                
                int c = 0;
                while ( ( c = System.in.read()) > -1 )
                {
                    this.out.write(c);
					
                }                
            }
            catch ( IOException e )
            {
                e.printStackTrace();
            }            
        }
    }
	
    public static void main ( String[] args )
    {
        try
        {
            (new TwoWaySerialCommTwo()).connect("COM13");
        }
        catch ( Exception e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

[Tony Docherty]

In what way are you stuck? Please explain exactly what you want to do and what is actually happening.

[Scott Eric Catalano]

When the message printed from the arduino to the console: OFF or ON I would like to trigger an event based on the word: OFF or ON below is the section of code that received the OFF or ON:

public static class SerialReader implements Runnable 
    {
        InputStream in;
        
        public SerialReader ( InputStream in )
        {
            this.in = in;
        }
        
        public void run ()
        {
            byte[] buffer = new byte[1024];
            int len = -1;

			try
            {
              
			  while ( ( len = this.in.read(buffer)) > -1 )
				{
					// THIS IS WHERE I WOULD LIKE TO PUT MY ACTION
					
 if( Input from Arduino equals OFF) {

do something here ei: System.out.println("Message Received");

}

                    System.out.print(new String(buffer,0,len));
					
                }
				
            }
            catch ( IOException e )
            {
                e.printStackTrace();
            }            
        }
    }

How ever if I put any code in there and recompile...I do not get any errors also my action does not occur. Being a perl programmer this type of code does work. I know this is handled differently in Java. Thanks for the help.