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CFA-634 and timeout and java

ra104

New member
I have a problem to write a program in java that use the Crystalfontz LCD CFA-634 USB.

I believe that the problem is caused by java communications that don't support trasmit timeout. I have write this source code but don't work

....

CommPort port = portId.open("LCD",2000);
serialPort = (SerialPort) port;
osSerial= serialPort.getOutputStream();
serialPort.setSerialPortParams(19200,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
//and then i write on osSerial
....

Do you have a simple example of using Crystalfontz LCD CFA-634 in java or know because this source code don't work?
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CF Tech

Administrator
Sorry, but I'm not too strong on Java. Did you follow this example from
http://java.sun.com/developer/releases/javacomm/SimpleWrite.java
Code:
/*
 * @(#)SimpleWrite.java	1.12 98/06/25 SMI
 * 
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 * 
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license
 * to use, modify and redistribute this software in source and binary
 * code form, provided that i) this copyright notice and license appear
 * on all copies of the software; and ii) Licensee does not utilize the
 * software in a manner which is disparaging to Sun.
 * 
 * This software is provided "AS IS," without a warranty of any kind.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
 * SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
 * BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
 * OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * This software is not designed or intended for use in on-line control
 * of aircraft, air traffic, aircraft navigation or aircraft
 * communications; or in the design, construction, operation or
 * maintenance of any nuclear facility. Licensee represents and
 * warrants that it will not use or redistribute the Software for such
 * purposes.
 */
import java.io.*;
import java.util.*;
import javax.comm.*;

/**
 * Class declaration
 *
 *
 * @author
 * @version 1.10, 08/04/00
 */
public class SimpleWrite {
    static Enumeration	      portList;
    static CommPortIdentifier portId;
    static String	      messageString = "Hello, world!";
    static SerialPort	      serialPort;
    static OutputStream       outputStream;
    static boolean	      outputBufferEmptyFlag = false;
    /**
     * Method declaration
     *
     *
     * @param args
     *
     * @see
     */
    public static void main(String[] args) {
	boolean portFound = false;
	String  defaultPort = "/dev/term/a";

	if (args.length > 0) {
	    defaultPort = args[0];
	} 

	portList = CommPortIdentifier.getPortIdentifiers();

	while (portList.hasMoreElements()) {
	    portId = (CommPortIdentifier) portList.nextElement();

	    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

		if (portId.getName().equals(defaultPort)) {
		    System.out.println("Found port " + defaultPort);

		    portFound = true;

		    try {
			serialPort = 
			    (SerialPort) portId.open("SimpleWrite", 2000);
		    } catch (PortInUseException e) {
			System.out.println("Port in use.");

			continue;
		    } 

		    try {
			outputStream = serialPort.getOutputStream();
		    } catch (IOException e) {}

		    try {
			serialPort.setSerialPortParams(9600, 
						       SerialPort.DATABITS_8, 
						       SerialPort.STOPBITS_1, 
						       SerialPort.PARITY_NONE);
		    } catch (UnsupportedCommOperationException e) {}
	

		    try {
		    	serialPort.notifyOnOutputEmpty(true);
		    } catch (Exception e) {
			System.out.println("Error setting event notification");
			System.out.println(e.toString());
			System.exit(-1);
		    }
		    
		    
		    System.out.println(
		    	"Writing \""+messageString+"\" to "
			+serialPort.getName());

		    try {
			outputStream.write(messageString.getBytes());
		    } catch (IOException e) {}

		    try {
		       Thread.sleep(2000);  // Be sure data is xferred before closing
		    } catch (Exception e) {}
		    serialPort.close();
		    System.exit(1);
		} 
	    } 
	} 

	if (!portFound) {
	    System.out.println("port " + defaultPort + " not found.");
	} 
    } 


}
If you change the baud of that to 19200, I think is should print out the "Hello World".
 
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