Two way communcation with the serial port

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Revision as of 16:01, 24 September 2007

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import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;

import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TwoWaySerialComm
{
    public TwoWaySerialComm()
    {
        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(57600,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 )
                {
                    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 TwoWaySerialComm()).connect("COM3");
        }
        catch ( Exception e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

Revision as of 00:11, 24 September 2007 (view source) 209.237.84.142 (Talk) ← Older edit		Revision as of 16:01, 24 September 2007 (view source) 207.44.238.95 (Talk) Newer edit →
Line 1:		Line 1:
-	Below is a simple program that shows how to open a connection to a serial device and then interact with it (receiving data and sending data). One thing to note is that the package gnu.io is used instead of javax.comm, though other than the change in package name the API follows the [http://java.sun.com/products/javacomm/ Java Communication API]. 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[http://www.hiidenkivenpaivakoti.fi/help/new/rbvtxq.html Erica campbell] Below is a simple program that shows how to open a connection to a serial device and then interact with it (receiving data and sending data). One thing to note is that the package gnu.io is used instead of javax.comm, though other than the change in package name the API follows the [http://java.sun.com/products/javacomm/ Java Communication API]. To find the names of the available ports, see the [[Discovering comm ports]] example.

	<pre>		<pre>

Two way communcation with the serial port

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Revision as of 16:01, 24 September 2007

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