/** Always use flow control, not considered a user-setable option */
protected void setSerialPort(SerialPort activeSerialPort)
throws gnu.io.UnsupportedCommOperationException {
// find the baud rate value, configure comm options
int baud = 19200; // default, but also defaulted in the initial value of selectedSpeed
for (int i = 0; i < validBaudNumber().length; i++) {
if (validBaudRates()[i].equals(mBaudRate)) {
baud = validBaudNumber()[i];
}
}
activeSerialPort.setSerialPortParams(
baud, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
// set RTS high, DTR high - done early, so flow control can be configured after
activeSerialPort.setRTS(true); // not connected in some serial ports and adapters
activeSerialPort.setDTR(true); // pin 1 in Mac DIN8; on main connector, this is DTR
// configure flow control to always on
int flow = SerialPort.FLOWCONTROL_RTSCTS_OUT;
activeSerialPort.setFlowControlMode(flow);
log.debug(
"Found flow control "
+ activeSerialPort.getFlowControlMode()
+ " RTSCTS_OUT="
+ SerialPort.FLOWCONTROL_RTSCTS_OUT
+ " RTSCTS_IN= "
+ SerialPort.FLOWCONTROL_RTSCTS_IN);
}
public SerialSettings getSettings() {
return new SerialSettings(
mSerialPort.getBaudRate(),
mSerialPort.getDataBits(),
mSerialPort.getStopBits(),
mSerialPort.getParity(),
mSerialPort.getFlowControlMode());
}
/**
* Sets the connection parameters to the setting in the parameters object. If set fails return the
* parameters object to origional settings and throw exception.
*
* @throws Exception if the configured parameters cannot be set properly on the port.
*/
public void setConnectionParameters() throws Exception {
// Save state of parameters before trying a set.
int oldBaudRate = m_SerialPort.getBaudRate();
int oldDatabits = m_SerialPort.getDataBits();
int oldStopbits = m_SerialPort.getStopBits();
int oldParity = m_SerialPort.getParity();
int oldFlowControl = m_SerialPort.getFlowControlMode();
// Set connection parameters, if set fails return parameters object
// to original state.
try {
m_SerialPort.setSerialPortParams(
m_Parameters.getBaudRate(),
m_Parameters.getDatabits(),
m_Parameters.getStopbits(),
m_Parameters.getParity());
} catch (UnsupportedCommOperationException e) {
m_Parameters.setBaudRate(oldBaudRate);
m_Parameters.setDatabits(oldDatabits);
m_Parameters.setStopbits(oldStopbits);
m_Parameters.setParity(oldParity);
final String errMsg = "Unsupported parameter";
logger.debug(
"{} failed to set up one of [baudRate, dataBits, stopBits, parity]: {}",
errMsg,
e.getMessage());
throw new Exception(errMsg);
}
// Set flow control.
try {
m_SerialPort.setFlowControlMode(
m_Parameters.getFlowControlIn() | m_Parameters.getFlowControlOut());
} catch (UnsupportedCommOperationException e) {
final String errMsg = "Unsupported flow control";
logger.debug("{}: {}", errMsg, e.getMessage());
throw new Exception(errMsg);
}
} // setConnectionParameters
/**
* 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);
}
}
}