/**
* Can the port accept additional characters? The state of CTS determines this, as there seems to
* be no way to check the number of queued bytes and buffer length. This might go false for short
* intervals, but it might also stick off if something goes wrong.
*/
public boolean okToSend() {
if ((activeSerialPort.getFlowControlMode() & SerialPort.FLOWCONTROL_RTSCTS_OUT)
== SerialPort.FLOWCONTROL_RTSCTS_OUT) {
if (checkBuffer) {
log.debug("CTS: " + activeSerialPort.isCTS() + " Buffer Empty: " + OutputBufferEmpty);
return (activeSerialPort.isCTS() && OutputBufferEmpty);
} else {
log.debug("CTS: " + activeSerialPort.isCTS());
return (activeSerialPort.isCTS());
}
} else {
if (checkBuffer) {
log.debug("Buffer Empty: " + OutputBufferEmpty);
return (OutputBufferEmpty);
} else {
log.debug("No Flow Control or Buffer Check");
return (true);
}
}
}
public synchronized String openPort(String portName, String appName) {
// open the port, check ability to set moderators
try {
// get and open the primary port
CommPortIdentifier portID = CommPortIdentifier.getPortIdentifier(portName);
try {
activeSerialPort = (SerialPort) portID.open(appName, 2000); // name of program, msec to wait
} catch (PortInUseException p) {
handlePortBusy(p, portName);
return "Port " + p + " in use already";
}
// try to set it for communication via SerialDriver
try {
// Doc says 7 bits, but 8 seems needed
activeSerialPort.setSerialPortParams(
38400, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
} catch (gnu.io.UnsupportedCommOperationException e) {
log.error("Cannot set serial parameters on port " + portName + ": " + e.getMessage());
return "Cannot set serial parameters on port " + portName + ": " + e.getMessage();
}
// set RTS high, DTR high
activeSerialPort.setRTS(true); // not connected in some serial ports and adapters
activeSerialPort.setDTR(true); // pin 1 in DIN8; on main connector, this is DTR
// disable flow control; hardware lines used for signaling, XON/XOFF might appear in data
activeSerialPort.setFlowControlMode(0);
// set timeout
log.debug(
"Serial timeout was observed as: "
+ activeSerialPort.getReceiveTimeout()
+ " "
+ activeSerialPort.isReceiveTimeoutEnabled());
// get and save stream
serialStream = new DataInputStream(activeSerialPort.getInputStream());
ostream = activeSerialPort.getOutputStream();
// make less verbose
sendBytes(new byte[] {(byte) 'L', (byte) '-', 10, 13});
// purge contents, if any
int count = serialStream.available();
log.debug("input stream shows " + count + " bytes available");
while (count > 0) {
serialStream.skip(count);
count = serialStream.available();
}
// report status?
if (log.isInfoEnabled()) {
log.info(
portName
+ " port opened at "
+ activeSerialPort.getBaudRate()
+ " baud, sees "
+ " DTR: "
+ activeSerialPort.isDTR()
+ " RTS: "
+ activeSerialPort.isRTS()
+ " DSR: "
+ activeSerialPort.isDSR()
+ " CTS: "
+ activeSerialPort.isCTS()
+ " CD: "
+ activeSerialPort.isCD());
}
} catch (java.io.IOException ex) {
log.error("IO error while opening port " + portName, ex);
return "IO error while opening port " + portName + ": " + ex;
} catch (gnu.io.UnsupportedCommOperationException ex) {
log.error("Unsupported communications operation while opening port " + portName, ex);
return "Unsupported communications operation while opening port " + portName + ": " + ex;
} catch (gnu.io.NoSuchPortException ex) {
log.error("No such port: " + portName, ex);
return "No such port: " + portName + ": " + ex;
}
return null; // indicates OK return
}
/** Reestablish a lost connection. */
protected void reestablishConnection() {
String[] options = {
tanitaResourceBundle.getString("OK"),
tanitaResourceBundle.getString("Cancel"),
tanitaResourceBundle.getString("Settings")
};
// Loop until connection is reestablished.
int selectedOption;
while (serialPort == null || !serialPort.isCTS()) {
selectedOption =
JOptionPane.showOptionDialog(
appWindow,
tanitaResourceBundle.getString("Err.No_communication"),
tanitaResourceBundle.getString("Title.Communication_problem"),
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.ERROR_MESSAGE,
null,
options,
tanitaResourceBundle.getString("OK"));
// OK option selected.
if (selectedOption == 0) {
// Try to reestablish connection.
setupSerialPort();
// Cancel option selected.
} else if (selectedOption == 1) {
exitUI();
break;
// Configuration option selected.
} else if (selectedOption == 2) {
// List all serial port in a drop down list, so a new one can be
// selected.
refreshSerialPortList();
String selectedPort =
(String)
JOptionPane.showInputDialog(
appWindow,
tanitaResourceBundle.getString("Instruction.Choose_port"),
tanitaResourceBundle.getString("Title.Settings"),
JOptionPane.QUESTION_MESSAGE,
null,
availablePortNames.toArray(),
getTanitaCommPort());
if (selectedPort != null) {
setTanitaCommPort(selectedPort);
try {
settingsHelper.saveSettings(tanitaLocalSettings);
} catch (CouldNotSaveSettingsException e) {
log.error("Local settings could not be persisted.", e);
}
setupSerialPort();
} else {
exitUI();
}
}
}
}
