Class RFIDPacket

java.lang.Object
  RFIDPacket

public class RFIDPacket
extends java.lang.Object

Stores all information contained in RFID reader packets. Provides methods to manipulate data and format properly for other objects.

Field Summary

private int	checkSumLsb LRC - A cumulative Exclusive OR(XOR) operation on all the bytes.
private int	checkSumMsb Ones complement of checkSumLSB.
private int	command Specifies action to be taken by the reader Length of 1 Byte.
private int	commandFlag Specifies action to be taken by the reader Length of 1 Byte.
private int[]	data Contains the command data.
private int	length Describes length of the packet.

Constructor Summary

RFIDPacket(int[] dataBuffer)
Creates a new RFIDPacket Object

RFIDPacket(int cmdFlag, int cmd)
Creates a new RFIDPacket Object

Method Summary

private void	calcCheckSum() Calculates and sets the block character check (BCC) checksum.
private byte	encodeUnsigned(int num) Encodes the given integer into an equivilant unsigned byte represented in two's complement form.
int	getTagID() Returns the tag identification number from the packet.
void	printOut() Prints out packet information.
private void	setLength() Calculates and sets the packet length.
byte[]	toArray() Converts the packet information to a sendable array of bytes.

Methods inherited from class java.lang.Object

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

Field Detail

length

private int length

Describes length of the packet. Length of number is 2 Bytes, LSB first MSB second

commandFlag

private int commandFlag

Specifies action to be taken by the reader Length of 1 Byte.

command

private int command

Specifies action to be taken by the reader Length of 1 Byte.

data

private int[] data

Contains the command data. Variable in length from 0 to XX Bytes.

checkSumLsb

private int checkSumLsb

LRC - A cumulative Exclusive OR(XOR) operation on all the bytes.

checkSumMsb

private int checkSumMsb

Ones complement of checkSumLSB.

Constructor Detail

RFIDPacket

public RFIDPacket(int cmdFlag,
                  int cmd)

Creates a new RFIDPacket Object

Parameters:

cmdFlag - Specifies action to be taken by the reader or the action that was recently performed by the reader.

cmd - Specifies action to be taken by the reader or the action that was recently performed by the reader.

RFIDPacket

public RFIDPacket(int[] dataBuffer)

Creates a new RFIDPacket Object

Parameters:

array - dataBuffer to manipulate

Method Detail

printOut

public void printOut()

Prints out packet information.

calcCheckSum

private void calcCheckSum()

Calculates and sets the block character check (BCC) checksum.

setLength

private void setLength()

Calculates and sets the packet length.

toArray

public byte[] toArray()

Converts the packet information to a sendable array of bytes.

Returns:

The byte array to be sent to the reader.

encodeUnsigned

private byte encodeUnsigned(int num)

Encodes the given integer into an equivilant unsigned byte represented in two's complement form.

Parameters:

num - The integer to be encoded

Returns:

The encoded byte.

getTagID

public int getTagID()

Returns the tag identification number from the packet.

Returns:

The tag ID number or -1 if no tag ID exists.