Java e Arduino...

International Italiano Software
2

Nessuno?...

ecco il codice:

import java.io.InputStream;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.util.Enumeration;
import java.util.TooManyListenersException;

import processing.app.Preferences;

import com.sun.corba.se.impl.interceptors.PINoOpHandlerImpl;

public class SerialTest implements SerialPortEventListener {
SerialPort serialPort;
/** The port we're normally going to use. /
private static final String PORT_NAMES[] = {
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM4", // Windows
};
/* Buffered input stream from the port /
private InputStream input;
/* The output stream to the port /
private OutputStream output;
/* Milliseconds to block while waiting for port open /
private static final int TIME_OUT = 2000;
/* Default bits per second for COM port. */
private static final int DATA_RATE = 9600;

public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

// iterate through, looking for the port
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}

if (portId == null) {
System.out.println("Could not find COM port.");
return;
}

try {
// open serial port, and use class name for the appName.
serialPort = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);

// set port parameters
serialPort.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);

// open the streams
input = serialPort.getInputStream();
output = serialPort.getOutputStream();
// add event listeners
serialPort.addEventListener(this);
serialPort.notifyOnDataAvailable(true);

} catch (Exception e) {
System.err.println(e.toString());
}
}
public SerialPort getPort(){
return this.serialPort;
}
/**

  • This should be called when you stop using the port.
  • This will prevent port locking on platforms like Linux.
    */

public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}

/**

  • Handle an event on the serial port. Read the data and print it.
    */
    public synchronized void serialEvent(SerialPortEvent oEvent) {
    if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
    try {
    int available = input.available();
    byte chunk[] = new byte[available];
    input.read(chunk, 0, available);
    // System.out.println("sono qui");
    // Displayed results are codepage dependent
    // while(input.available()>0) {
    System.out.print(new String(chunk));//}

} catch (Exception e) {
this.close();
System.err.println(e.toString());
}
}
// Ignore all the other eventTypes, but you should consider the other ones.
}

public static void main(String[] args) throws Exception {
SerialTest main = new SerialTest();
main.initialize();
System.out.println("Started");

main.serialEvent(null);

main.close();
System.out.println("Stopped");

}
}

questa è l'eccezione:

Stable Library

Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
Started
Exception in thread "main" java.lang.NullPointerException
at SerialTest.serialEvent(SerialTest.java:93)
at SerialTest.main(SerialTest.java:117)
Hello World
Hello World
Hello World
Hello World
Hello World
Hello World
.....