com.dalsemi.system
Class I2CPort

java.lang.Object
  |
  +--com.dalsemi.system.I2CPort

public class I2CPort

extends java.lang.Object

This class encapsulates I2C protocol using one of two resources:
1. P5.0(SCL) and P5.1(SDA)
2. Any two memory mapped IO areas. Masks required to select bit or bits within byte for SCL and SDA.

Field Summary

static byte	CE0
static byte	CE1
static byte	CE2
static byte	CE3
byte	clockDelay
byte	I2CStretchCycles
int	latchValue
static byte	PCE0
static byte	PCE1
static byte	PCE2
static byte	PCE3
byte	SCLChipSelect
byte	SCLMask
int	SCLOffset
byte	SDAChipSelect
byte	SDAMask
int	SDAOffset
byte	slaveAddress
static byte	STRETCH10
static byte	STRETCH11
static byte	STRETCH12
static byte	STRETCH2
static byte	STRETCH3
static byte	STRETCH4
static byte	STRETCH5
static byte	STRETCH9
byte	stretchCycles

Constructor Summary

I2CPort()
Use processor port pin P5.0 for SCL and P5.1 for SDA.

I2CPort(byte SCLChipSelect, int SCLOffset, byte SCLMask, byte SDAChipSelect, int SDAOffset, byte SDAMask)
Use memory mapped IO address for SCL and SDA pins.

Method Summary

int	getStretchCycles() Get the MOVX stretch cycles for read/write.
int	read(byte[] barr, int len) Read into the byte array from the current slave address
void	setAddress(byte address) Set the I2C slave address.
void	setClockDelay(byte delay) Set the clock delay for the I2C bus.
void	setStretchCycles(byte stretch) Set the MOVX stretch cycles for read/write.
int	write(byte[] barr, int len) Write the byte array to the current slave address

Methods inherited from class java.lang.Object

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

Field Detail

CE0

public static final byte CE0

CE1

public static final byte CE1

CE2

public static final byte CE2

CE3

public static final byte CE3

PCE0

public static final byte PCE0

PCE1

public static final byte PCE1

PCE2

public static final byte PCE2

PCE3

public static final byte PCE3

STRETCH2

public static final byte STRETCH2

STRETCH3

public static final byte STRETCH3

STRETCH4

public static final byte STRETCH4

STRETCH5

public static final byte STRETCH5

STRETCH9

public static final byte STRETCH9

STRETCH10

public static final byte STRETCH10

STRETCH11

public static final byte STRETCH11

STRETCH12

public static final byte STRETCH12

latchValue

public int latchValue

stretchCycles

public byte stretchCycles

slaveAddress

public byte slaveAddress

clockDelay

public byte clockDelay

I2CStretchCycles

public byte I2CStretchCycles

SCLChipSelect

public byte SCLChipSelect

SCLOffset

public int SCLOffset

SCLMask

public byte SCLMask

SDAChipSelect

public byte SDAChipSelect

SDAOffset

public int SDAOffset

SDAMask

public byte SDAMask

Constructor Detail

I2CPort

public I2CPort()

Use processor port pin P5.0 for SCL and P5.1 for SDA.

I2CPort

public I2CPort(byte SCLChipSelect,
               int SCLOffset,
               byte SCLMask,
               byte SDAChipSelect,
               int SDAOffset,
               byte SDAMask)

Use memory mapped IO address for SCL and SDA pins.

Parameters:

SCLChipSelect - Descriptor of chipselect to use.

SCLOffset - Offset from the chip select.

SCLMask - Mask of bit or bits to use.

SDAChipSelect - Descriptor of chipselect to use.

SDAOffset - Offset from the chip select.

SDAMask - Mask of bit or bits to use.

Method Detail

setAddress

public void setAddress(byte address)

Set the I2C slave address. This address will take effect on the next read or write.

Parameters:

address - Addres of I2C slave device.

setClockDelay

public void setClockDelay(byte delay)

Set the clock delay for the I2C bus.

Parameters:

delay - I2C Clock delay

setStretchCycles

public void setStretchCycles(byte stretch)
                      throws java.io.IOException

Set the MOVX stretch cycles for read/write.

Parameters:

stretch - Stretch cycle value.

Throws:

java.io.IOException - if stretch is out of range.

getStretchCycles

public int getStretchCycles()

Get the MOVX stretch cycles for read/write.

Returns:

Stretch cycle value.

write

public int write(byte[] barr,
                 int len)

Write the byte array to the current slave address

Parameters:

barr - Array of bytes to send

len - Length of bytes to send

Returns:

-1 on error

read

public int read(byte[] barr,
                int len)

Read into the byte array from the current slave address

Parameters:

barr - Array to fill from read operation

len - Length of bytes to read

Returns:

-1 on error