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estou usando a API RxTx, para acessar a RS232 do computador, baixei os demos, mas esta acontecendo um problema, quando a serial do micro já esta aberta por outro aplicativo ex hiperterminal e eu tento abrir com o programinha demo , deveria avisar que
a serial esta sendo usada e fim de papo. mas isso não acontece , dá pau…
//import javax.comm.*;
import gnu.io.*; // serial API
import java.io.*;
import java.awt.TextArea;
import java.awt.event.*;
import java.util.TooManyListenersException;
/**
A class that handles the details of a serial connection. Reads from one
TextArea and writes to a second TextArea.
Holds the state of the connection.
*/
public class SerialConnection implements SerialPortEventListener,
CommPortOwnershipListener {
private SerialDemo parent;
private TextArea messageAreaOut;
private TextArea messageAreaIn;
private SerialParameters parameters;
private OutputStream os;
private InputStream is;
private KeyHandler keyHandler;
private CommPortIdentifier portId;
private SerialPort sPort;
private boolean open;
/**
Creates a SerialConnection object and initilizes variables passed in
as params.
@param parent A SerialDemo object.
@param parameters A SerialParameters object.
@param messageAreaOut The TextArea that messages that are to be sent out
of the serial port are entered into.
@param messageAreaIn The TextArea that messages comming into the serial
port are displayed on.
*/
public SerialConnection(SerialDemo parent,
SerialParameters parameters,
TextArea messageAreaOut,
TextArea messageAreaIn) {
this.parent = parent;
this.parameters = parameters;
this.messageAreaOut = messageAreaOut;
this.messageAreaIn = messageAreaIn;
open = false;
}
/**
Attempts to open a serial connection and streams using the parameters
in the SerialParameters object. If it is unsuccesfull at any step it
returns the port to a closed state, throws a
<code>SerialConnectionException</code>, and returns.
Gives a timeout of 30 seconds on the portOpen to allow other applications
to reliquish the port if have it open and no longer need it.
*/
public void openConnection() throws SerialConnectionException {
// Obtain a CommPortIdentifier object for the port you want to open.
try {
portId =
CommPortIdentifier.getPortIdentifier(parameters.getPortName());
} catch (NoSuchPortException e) {
throw new SerialConnectionException(e.getMessage());
}
// Open the port represented by the CommPortIdentifier object. Give
// the open call a relatively long timeout of 30 seconds to allow
// a different application to reliquish the port if the user
// wants to.
try {
sPort = (SerialPort)portId.open("SerialDemo", 30000);
} catch (PortInUseException e) {
throw new SerialConnectionException(e.getMessage());
}
// Set the parameters of the connection. If they won't set, close the
// port before throwing an exception.
try {
setConnectionParameters();
} catch (SerialConnectionException e) {
sPort.close();
throw e;
}
// Open the input and output streams for the connection. If they won't
// open, close the port before throwing an exception.
try {
os = sPort.getOutputStream();
is = sPort.getInputStream();
} catch (IOException e) {
sPort.close();
throw new SerialConnectionException("Error opening i/o streams");
}
// Create a new KeyHandler to respond to key strokes in the
// messageAreaOut. Add the KeyHandler as a keyListener to the
// messageAreaOut.
keyHandler = new KeyHandler(os);
messageAreaOut.addKeyListener(keyHandler);
// Add this object as an event listener for the serial port.
try {
sPort.addEventListener(this);
} catch (TooManyListenersException e) {
sPort.close();
throw new SerialConnectionException("too many listeners added");
}
// Set notifyOnDataAvailable to true to allow event driven input.
sPort.notifyOnDataAvailable(true);
// Set notifyOnBreakInterrup to allow event driven break handling.
sPort.notifyOnBreakInterrupt(true);
// Set receive timeout to allow breaking out of polling loop during
// input handling.
try {
sPort.enableReceiveTimeout(30);
} catch (UnsupportedCommOperationException e) {
}
// Add ownership listener to allow ownership event handling.
portId.addPortOwnershipListener(this);
open = true;
}
/**
Sets the connection parameters to the setting in the parameters object.
If set fails return the parameters object to origional settings and
throw exception.
*/
public void setConnectionParameters() throws SerialConnectionException {
// Save state of parameters before trying a set.
int oldBaudRate = sPort.getBaudRate();
int oldDatabits = sPort.getDataBits();
int oldStopbits = sPort.getStopBits();
int oldParity = sPort.getParity();
int oldFlowControl = sPort.getFlowControlMode();
// Set connection parameters, if set fails return parameters object
// to original state.
try {
sPort.setSerialPortParams(parameters.getBaudRate(),
parameters.getDatabits(),
parameters.getStopbits(),
parameters.getParity());
} catch (UnsupportedCommOperationException e) {
parameters.setBaudRate(oldBaudRate);
parameters.setDatabits(oldDatabits);
parameters.setStopbits(oldStopbits);
parameters.setParity(oldParity);
throw new SerialConnectionException("Unsupported parameter");
}
// Set flow control.
try {
sPort.setFlowControlMode(parameters.getFlowControlIn()
| parameters.getFlowControlOut());
} catch (UnsupportedCommOperationException e) {
throw new SerialConnectionException("Unsupported flow control");
}
}
/**
Close the port and clean up associated elements.
*/
public void closeConnection() {
// If port is alread closed just return.
if (!open) {
return;
}
// Remove the key listener.
messageAreaOut.removeKeyListener(keyHandler);
// Check to make sure sPort has reference to avoid a NPE.
if (sPort != null) {
try {
// close the i/o streams.
os.close();
is.close();
} catch (IOException e) {
System.err.println(e);
}
// Close the port.
sPort.close();
// Remove the ownership listener.
portId.removePortOwnershipListener(this);
}
open = false;
}
/**
Send a one second break signal.
*/
public void sendBreak() {
sPort.sendBreak(1000);
}
/**
Reports the open status of the port.
@return true if port is open, false if port is closed.
*/
public boolean isOpen() {
return open;
}
/**
Handles SerialPortEvents. The two types of SerialPortEvents that this
program is registered to listen for are DATA_AVAILABLE and BI. During
DATA_AVAILABLE the port buffer is read until it is drained, when no more
data is availble and 30ms has passed the method returns. When a BI
event occurs the words BREAK RECEIVED are written to the messageAreaIn.
*/
public void serialEvent(SerialPortEvent e) {
// Create a StringBuffer and int to receive input data.
StringBuffer inputBuffer = new StringBuffer();
int newData = 0;
// Determine type of event.
switch (e.getEventType()) {
// Read data until -1 is returned. If \r is received substitute
// \n for correct newline handling.
case SerialPortEvent.DATA_AVAILABLE:
while (newData != -1) {
try {
newData = is.read();
if (newData == -1) {
break;
}
if ('\r' == (char)newData) {
inputBuffer.append('\n');
} else {
inputBuffer.append((char)newData);
}
} catch (IOException ex) {
System.err.println(ex);
return;
}
}
// Append received data to messageAreaIn.
messageAreaIn.append(new String(inputBuffer));
break;
// If break event append BREAK RECEIVED message.
case SerialPortEvent.BI:
messageAreaIn.append("\n--- BREAK RECEIVED ---\n");
}
}
/**
Handles ownership events. If a PORT_OWNERSHIP_REQUESTED event is
received a dialog box is created asking the user if they are
willing to give up the port. No action is taken on other types
of ownership events.
*/
public void ownershipChange(int type) {
if (type == CommPortOwnershipListener.PORT_OWNERSHIP_REQUESTED) {
PortRequestedDialog prd = new PortRequestedDialog(parent);
}
}
/**
A class to handle <code>KeyEvent</code>s generated by the messageAreaOut.
When a <code>KeyEvent</code> occurs the <code>char</code> that is
generated by the event is read, converted to an <code>int</code> and
writen to the <code>OutputStream</code> for the port.
*/
class KeyHandler extends KeyAdapter {
OutputStream os;
/**
Creates the KeyHandler.
@param os The OutputStream for the port.
*/
public KeyHandler(OutputStream os) {
super();
this.os = os;
}
/**
Handles the KeyEvent.
Gets the <code>char</char> generated by the <code>KeyEvent</code>,
converts it to an <code>int</code>, writes it to the <code>
OutputStream</code> for the port.
*/
public void keyTyped(KeyEvent evt) {
char newCharacter = evt.getKeyChar();
try {
os.write((int)newCharacter);
} catch (IOException e) {
System.err.println("OutputStream write error: " + e);
}
}
}
}acho que o problema esta no metodo openConnection()
pois fiz uns debugs e parece que o negócio trava nesta linha.
sPort = (SerialPort) portId.open("SerialDemo", 30000);se alguém puder ajudar…
sds
j.silvestre