/**
* Copyright (c) 2009, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of MSPSim.
*
* $Id: $
*
* -----------------------------------------------------------------
*
*
* Author : Joakim Eriksson
* Created : mar 2009
* Updated : $Date:$
* $Revision:$
*/
package se.sics.mspsim.net;
import java.io.PrintStream;
import se.sics.jipv6.core.AbstractPacketHandler;
import se.sics.jipv6.core.Packet;
import se.sics.mspsim.chip.RFListener;
import se.sics.mspsim.core.MSP430Core;
import se.sics.mspsim.core.TimeEvent;
import se.sics.mspsim.util.Utils;
public class CC2420PacketHandler extends AbstractPacketHandler implements RFListener {
public static final String CC2420_LEN = "cc2420.len";
private static final int SFD_SEARCH = 1;
private static final int LEN = 2;
private static final int PACKET = 3;
private static final byte[] PREAMBLE = {0, 0, 0, 0, 0x7a};
private PrintStream out;
byte[] packetBuffer = new byte[256];
int mode = SFD_SEARCH;
int pos;
int packetLen;
int sfdSearch = 0;
MSP430Core cpu;
public CC2420PacketHandler(MSP430Core cpu) {
this.cpu = cpu;
}
public void receivedByte(byte data) {
packetBuffer[pos++] = data;
switch (mode) {
case SFD_SEARCH:
if (sfdSearch < 4 && data == 0)
sfdSearch++;
if (sfdSearch == 4 && data == 0x7a) {
mode = LEN;
sfdSearch = 0;
}
break;
case LEN:
mode = PACKET;
packetLen = data & 0xff;
System.out.println("Packet len: " + packetLen);
break;
case PACKET:
if (pos == packetLen + PREAMBLE.length + 1) {
/* the packet is in!!! */
// CC2420Packet packet = new CC2420Packet();
// packet.setPayload(packetBuffer, PREAMBLE.length + 1, packetLen - 2);
Packet packet = new Packet();
packet.setBytes(packetBuffer, PREAMBLE.length + 1, packetLen - 2);
packet.setAttribute(CC2420_LEN, packet.getTotalLength());
dispatch(-1, packet);
System.out.println("CC2420: Packet received");
/* this is a packet that has passed the stack! */
mode = SFD_SEARCH;
pos = 0;
}
break;
}
}
public void printPacket(PrintStream out, Packet packet) {
int payloadLen = packet.getAttributeAsInt(CC2420_LEN);
out.print("CC2420 | len:" + payloadLen + " | ");
for (int i = 0; i < payloadLen; i++) {
out.print(Utils.hex8(packet.getData(i) & 0xff));
if ((i & 3) == 3) {
out.print(" ");
}
}
out.println();
}
public void sendPacket(Packet packet) {
final Packet sendPacket = packet;
byte[] size = new byte[1];
byte[] crc = new byte[2];
size[0] = (byte) ((packet.getTotalLength() + 2)& 0xff);
packet.prependBytes(size);
packet.prependBytes(PREAMBLE);
packet.appendBytes(crc);
byte[] data = packet.getBytes();
System.out.println("Should send packet to radio!!!! " + packet.getTotalLength());
// Stuff to send to radio!!!
TimeEvent te = new TimeEvent(0) {
public void execute(long t) {
System.out.println("CC2420: Packet to send: ");
byte[] buffer = sendPacket.getBytes();
for (int i = 0; i < buffer.length; i++) {
System.out.print(Utils.hex8(buffer[i]));
out.print(Utils.hex8(buffer[i]));
}
/* send to output + two additional bytes...! */
out.println();
}
};
/* schedule packet delivery in 10 ms */
cpu.scheduleTimeEventMillis(te, 10);
}
public void setOutput(PrintStream out) {
this.out = out;
}
public void packetReceived(Packet container) {
}
}