com.pi4j.io.i2c.impl

Class I2CBusImpl

java.lang.Object

com.pi4j.io.i2c.impl.I2CBusImpl

All Implemented Interfaces:

I2CBus

Direct Known Subclasses:

I2CBusImplBananaPi

public class I2CBusImpl
extends Object
implements I2CBus

This is implementation of i2c bus. This class keeps underlying linux file descriptor of particular bus. As all reads and writes from/to i2c bus are blocked I/Os current implementation uses only one file per bus for all devices. Device implementations use this class file handle.

Author:

Daniel Sendula

Field Summary

Fields

Modifier and Type	Field and Description
protected int	fd File handle for this i2c bus
protected String	filename File name of this i2c bus

Fields inherited from interface com.pi4j.io.i2c.I2CBus

BUS_0, BUS_1

Constructor Summary

Constructors

Constructor and Description
I2CBusImpl(String filename) Constructor of i2c bus implementation.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this i2c bus
static I2CBus	getBus(int busNumber) Factory method that returns bus implementation.
I2CDevice	getDevice(int address) Returns i2c device implementation (I2CDeviceImpl).
int	getFileDescriptor()
String	getFileName()

Methods inherited from class java.lang.Object

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

Field Detail

fd

protected int fd

File handle for this i2c bus

filename

protected String filename

File name of this i2c bus

Constructor Detail

I2CBusImpl

public I2CBusImpl(String filename)
           throws IOException

Constructor of i2c bus implementation.

Parameters:

filename - file name of device to be opened.

Throws:

IOException - thrown in case that file cannot be opened

Method Detail

getBus

public static I2CBus getBus(int busNumber)
                     throws IOException

Factory method that returns bus implementation.

Parameters:

busNumber - bus number

Returns:

appropriate bus implementation

Throws:

IOException - thrown in case there is a problem opening bus file or bus number is not 0 or 1.

getDevice

public I2CDevice getDevice(int address)
                    throws IOException

Returns i2c device implementation (I2CDeviceImpl).

Specified by:

getDevice in interface I2CBus

Parameters:

address - address of i2c device

Returns:

implementation of i2c device with given address

Throws:

IOException - never in this implementation

close

public void close()
           throws IOException

Closes this i2c bus

Specified by:

close in interface I2CBus

Throws:

IOException - never in this implementation

getFileName

public String getFileName()

Specified by:

getFileName in interface I2CBus

getFileDescriptor

public int getFileDescriptor()

Specified by:

getFileDescriptor in interface I2CBus