com.pi4j.io.serial.impl

Class SerialImpl

java.lang.Object

com.pi4j.io.serial.impl.SerialImpl

All Implemented Interfaces:

Serial

public class SerialImpl
extends Object
implements Serial

This implementation class implements the 'Serial' interface using the WiringPi Serial library.

Before using the Pi4J library, you need to ensure that the Java VM in configured with access to the following system libraries:

• pi4j
• wiringPi

This library depends on the wiringPi native system library.
(developed by Gordon Henderson @ http://wiringpi.com/)

Author:

Robert Savage (http://www.savagehomeautomation.com)

See Also:

Serial, SerialDataEvent, SerialDataListener, SerialFactory, http://www.pi4j.com/

Field Summary

Fields

Modifier and Type	Field and Description
protected int	fileDescriptor
protected boolean	isshutdown
protected CopyOnWriteArrayList<SerialDataListener>	listeners
protected SerialDataMonitorThread	monitor
protected int	monitorInterval

Fields inherited from interface com.pi4j.io.serial.Serial

DEFAULT_COM_PORT, DEFAULT_MONITOR_INTERVAL

Constructor Summary

Constructors

Constructor and Description
SerialImpl()

Method Summary

Modifier and Type	Method and Description
void	addListener(SerialDataListener... listener) Add Serial Event Listener
int	availableBytes() This method is called to determine if and how many bytes are available on the serial received data buffer.
void	close() This method is called to close a currently open open serial port.
void	flush() This method is called to immediately flush the serial data transmit buffer and force any pending data to be sent to the serial port immediately.
int	getMonitorInterval() This method returns the serial data receive monitor delay interval in milliseconds.
boolean	isClosed() This method is called to determine if the serial port is already closed.
boolean	isOpen() This method is called to determine if the serial port is already open.
boolean	isShutdown() This method returns TRUE if the serial interface has been shutdown.
void	open(String device, int baudRate) This method is call to open a serial port for communication.
char	read() This method will read the next character available from the serial port receive buffer.
void	removeListener(SerialDataListener... listener) Remove Serial Event Listener
void	setMonitorInterval(int interval) This method set the serial data receive monitor delay interval in milliseconds.
void	shutdown() This method can be called to forcefully shutdown all serial data monitoring threads.
void	write(byte data) This method is called to submit a single byte of data to the serial port transmit buffer.
void	write(byte[] data) This method is called to submit a byte array of data to the serial port transmit buffer.
void	write(char data) This method is called to submit a single character of data to the serial port transmit buffer.
void	write(char[] data) This method is called to submit a character array of data to the serial port transmit buffer.
void	write(String data) This method is called to submit a string of data to the serial port transmit buffer.
void	write(String data, String... args) This method is called to submit a string of formatted data to the serial port transmit buffer.
void	writeln(String data) This method is called to submit a string of data with trailing CR + LF characters to the serial port transmit buffer.
void	writeln(String data, String... args) This method is called to submit a string of formatted data with trailing CR + LF characters to the serial port transmit buffer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

fileDescriptor

protected int fileDescriptor

listeners

protected final CopyOnWriteArrayList<SerialDataListener> listeners

monitor

protected SerialDataMonitorThread monitor

monitorInterval

protected int monitorInterval

isshutdown

protected boolean isshutdown

Constructor Detail

SerialImpl

public SerialImpl()

Method Detail

open

public void open(String device,
                 int baudRate)
          throws SerialPortException

This method is call to open a serial port for communication. Throws SerialException on error.

Specified by:

open in interface Serial

Parameters:

device - The device address of the serial port to access. You can use constant 'DEFAULT_COM_PORT' if you wish to access the default serial port provided via the GPIO header.

baudRate - The baud rate to use with the serial port.

Throws:

SerialPortException - Exception thrown on any error.

See Also:

Serial.DEFAULT_COM_PORT

isOpen

public boolean isOpen()

This method is called to determine if the serial port is already open.

Specified by:

isOpen in interface Serial

Returns:

a value of 'true' is returned if the serial port is already open.

See Also:

open(String, int)

isClosed

public boolean isClosed()

This method is called to determine if the serial port is already closed.

Specified by:

isClosed in interface Serial

Returns:

a value of 'true' is returned if the serial port is already in the closed state.

See Also:

open(String, int)

close

public void close()
           throws IllegalStateException

This method is called to close a currently open open serial port.

Specified by:

close in interface Serial

Throws:

IllegalStateException

flush

public void flush()
           throws IllegalStateException

This method is called to immediately flush the serial data transmit buffer and force any pending data to be sent to the serial port immediately.

Specified by:

flush in interface Serial

Throws:

IllegalStateException

read

public char read()
          throws IllegalStateException

This method will read the next character available from the serial port receive buffer.

NOTE: If a serial data listener has been implemented and registered with this class, then this method should not be called directly. A background thread will be running to collect received data from the serial port receive buffer and the received data will be available on via the event.

Specified by:

read in interface Serial

Returns:

next available character in the serial data buffer

Throws:

IllegalStateException

write

public void write(char data)
           throws IllegalStateException

This method is called to submit a single character of data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A single character to be transmitted.

Throws:

IllegalStateException

write

public void write(char[] data)
           throws IllegalStateException

This method is called to submit a character array of data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A character array of data to be transmitted.

Throws:

IllegalStateException

write

public void write(byte data)
           throws IllegalStateException

This method is called to submit a single byte of data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A single byte to be transmitted.

Throws:

IllegalStateException

write

public void write(byte[] data)
           throws IllegalStateException

This method is called to submit a byte array of data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A byte array of data to be transmitted.

Throws:

IllegalStateException

write

public void write(String data)
           throws IllegalStateException

This method is called to submit a string of data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A string of data to be transmitted.

Throws:

IllegalStateException

writeln

public void writeln(String data)
             throws IllegalStateException

This method is called to submit a string of data with trailing CR + LF characters to the serial port transmit buffer.

Specified by:

writeln in interface Serial

Parameters:

data - A string of data to be transmitted.

Throws:

IllegalStateException

write

public void write(String data,
                  String... args)
           throws IllegalStateException

This method is called to submit a string of formatted data to the serial port transmit buffer.

Specified by:

write in interface Serial

Parameters:

data - A string of formatted data to be transmitted.

args - A series of arguments that can be included for the format string variable replacements.

Throws:

IllegalStateException

writeln

public void writeln(String data,
                    String... args)
             throws IllegalStateException

This method is called to submit a string of formatted data with trailing CR + LF characters to the serial port transmit buffer.

Specified by:

writeln in interface Serial

Parameters:

data - A string of formatted data to be transmitted.

args - A series of arguments that can be included for the format string variable replacements.

Throws:

IllegalStateException

availableBytes

public int availableBytes()
                   throws IllegalStateException

This method is called to determine if and how many bytes are available on the serial received data buffer.

Specified by:

availableBytes in interface Serial

Returns:

The number of available bytes pending in the serial received buffer is returned.

Throws:

IllegalStateException

addListener

public void addListener(SerialDataListener... listener)

Add Serial Event Listener

Java consumer code can call this method to register itself as a listener for serial data events.

Specified by:

addListener in interface Serial

Parameters:

listener - A class instance that implements the SerialListener interface.

See Also:

SerialDataListener, SerialDataEvent

removeListener

public void removeListener(SerialDataListener... listener)

Remove Serial Event Listener

Java consumer code can call this method to unregister itself as a listener for serial data events.

Specified by:

removeListener in interface Serial

Parameters:

listener - A class instance that implements the SerialListener interface.

See Also:

SerialDataListener, SerialDataEvent

isShutdown

public boolean isShutdown()

This method returns TRUE if the serial interface has been shutdown.

Specified by:

isShutdown in interface Serial

Returns:

shutdown state

shutdown

public void shutdown()

This method can be called to forcefully shutdown all serial data monitoring threads.

Specified by:

shutdown in interface Serial

getMonitorInterval

public int getMonitorInterval()

This method returns the serial data receive monitor delay interval in milliseconds.

Specified by:

getMonitorInterval in interface Serial

Returns:

interval milliseconds

setMonitorInterval

public void setMonitorInterval(int interval)

This method set the serial data receive monitor delay interval in milliseconds.

Specified by:

setMonitorInterval in interface Serial

Parameters:

interval - number of milliseconds