lejos.nxt.rcxcomm
Class LLCHandler

java.lang.Object
  lejos.nxt.rcxcomm.PacketHandler
      lejos.nxt.rcxcomm.LLCHandler

public class LLCHandler
extends PacketHandler

Packet handler than implement the LLC packet protocol. Deals with packets and acks. Supports independent streams of data in both directions.

Field Summary

Fields inherited from class lejos.nxt.rcxcomm.PacketHandler

lowerHandler

Constructor Summary

LLCHandler(SensorPort port)

Method Summary

boolean	isAckAvailable() Check if an Ack is available
boolean	isPacketAvailable() Check if a packet is available
int	receiveAck(byte[] buffer) Receive an ack.
int	receivePacket(byte[] buffer) Receive a packet.
boolean	sendPacket(byte[] packet, int len) Send a packet.

Methods inherited from class lejos.nxt.rcxcomm.PacketHandler

close, getError, open, reset, setListen

Methods inherited from class java.lang.Object

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

Constructor Detail

LLCHandler

public LLCHandler(SensorPort port)

Method Detail

sendPacket

public boolean sendPacket(byte[] packet,
                          int len)

Send a packet.

Specified by:

sendPacket in class PacketHandler

Parameters:

packet - the bytes to send

len - the number of bytes to send

Returns:

true if the send was successful, else false

receivePacket

public int receivePacket(byte[] buffer)

Receive a packet.

Specified by:

receivePacket in class PacketHandler

Parameters:

buffer - the buffer to receive the packet into

Returns:

the number of bytes received

receiveAck

public int receiveAck(byte[] buffer)

Receive an ack.

Overrides:

receiveAck in class PacketHandler

Parameters:

buffer - the buffer to receive the ack into

Returns:

the number of bytes received

isPacketAvailable

public boolean isPacketAvailable()

Check if a packet is available

Specified by:

isPacketAvailable in class PacketHandler

Returns:

true if a Packet is available, else false

isAckAvailable

public boolean isAckAvailable()

Check if an Ack is available

Overrides:

isAckAvailable in class PacketHandler

Returns:

true if ack is available, else false