Package se.sics.mspsim.util

Examples of se.sics.mspsim.util.CCITT_CRC


  public static byte[] fromCoojaToCC2420(RadioPacket packet) {
    byte cc2420Data[] = new byte[6+127];
    int pos = 0;
    byte packetData[] = packet.getPacketData();
    byte len; /* total packet minus preamble(4), synch(1) and length(1) */
    CCITT_CRC cc2420CRC = new CCITT_CRC();
    short contikiCRC = 0;

    /* 4 bytes preamble */
    if (WITH_PREAMBLE) {
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
    }

    /* 1 byte synch */
    if (WITH_SYNCH) {
      cc2420Data[pos++] = 0x7A;
    }

    /* 1 byte length */
    len = (byte) packetData.length;
    if (WITH_XMAC) {
      len += 6;
    }
    if (WITH_CHECKSUM) {
      len += 2;
    }
    if (WITH_TIMESTAMP) {
      len += 3;
    }
    if (WITH_FOOTER) {
      len += 2;
    }
    cc2420Data[pos++] = len;
    cc2420CRC.setCRC(0);

    /* 4 byte X-MAC: not implemented */
    if (WITH_XMAC) {
      cc2420Data[pos++] = 1; /* TYPE_DATA */
      cc2420CRC.addBitrev(1);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0; /* XXX sender: 0.0 */
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0; /* XXX receiver: 0.0 */
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
    }

    /* Payload */
    for (byte b : packetData) {
      contikiCRC = CRCCoder.crc16Add(b, contikiCRC);
      cc2420CRC.addBitrev(b & 0xFF);
    }
    System.arraycopy(packetData, 0, cc2420Data, pos, packetData.length);
    pos += packetData.length;

    /* 2 bytes checksum */
    if (WITH_CHECKSUM) {
      cc2420Data[pos++] = (byte) (contikiCRC & 0xff);
      cc2420CRC.addBitrev(contikiCRC & 0xFF);
      cc2420Data[pos++] = (byte) ((contikiCRC >> 8) & 0xff);
      cc2420CRC.addBitrev((contikiCRC >> 8) & 0xFF);
    }

    /* (TODO) 3 bytes timestamp */
    if (WITH_TIMESTAMP) {
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
    }

    /* 2 bytes footer: CC2420's CRC */
    if (WITH_FOOTER) {
      cc2420Data[pos++] = (byte) cc2420CRC.getCRCHi();
      cc2420Data[pos++] = (byte) cc2420CRC.getCRCLow();
    }

    byte cc2420DataStripped[] = new byte[pos];
    System.arraycopy(cc2420Data, 0, cc2420DataStripped, 0, pos);

View Full Code Here


  public static byte[] fromCoojaToCC2420(RadioPacket packet) {
    byte cc2420Data[] = new byte[6+127];
    int pos = 0;
    byte packetData[] = packet.getPacketData();
    byte len; /* total packet minus preamble(4), synch(1) and length(1) */
    CCITT_CRC cc2420CRC = new CCITT_CRC();
    short contikiCRC = 0;

    /* 4 bytes preamble */
    if (WITH_PREAMBLE) {
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
      cc2420Data[pos++] = 0;
    }

    /* 1 byte synch */
    if (WITH_SYNCH) {
      cc2420Data[pos++] = 0x7A;
    }

    /* 1 byte length */
    len = (byte) packetData.length;
    if (WITH_XMAC) {
      len += 6;
    }
    if (WITH_CHECKSUM) {
      len += 2;
    }
    if (WITH_TIMESTAMP) {
      len += 3;
    }
    if (WITH_FOOTER) {
      len += 2;
    }
    cc2420Data[pos++] = len;
    cc2420CRC.setCRC(0);

    /* 4 byte X-MAC: not implemented */
    if (WITH_XMAC) {
      cc2420Data[pos++] = 1; /* TYPE_DATA */
      cc2420CRC.addBitrev(1);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0; /* XXX sender: 0.0 */
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0; /* XXX receiver: 0.0 */
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      contikiCRC = CRCCoder.crc16Add((byte)0, contikiCRC);
    }

    /* Payload */
    for (byte b : packetData) {
      contikiCRC = CRCCoder.crc16Add(b, contikiCRC);
      cc2420CRC.addBitrev(b & 0xFF);
    }
    System.arraycopy(packetData, 0, cc2420Data, pos, packetData.length);
    pos += packetData.length;

    /* 2 bytes checksum */
    if (WITH_CHECKSUM) {
      cc2420Data[pos++] = (byte) (contikiCRC & 0xff);
      cc2420CRC.addBitrev(contikiCRC & 0xFF);
      cc2420Data[pos++] = (byte) ((contikiCRC >> 8) & 0xff);
      cc2420CRC.addBitrev((contikiCRC >> 8) & 0xFF);
    }

    /* (TODO) 3 bytes timestamp */
    if (WITH_TIMESTAMP) {
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
      cc2420Data[pos++] = 0;
      cc2420CRC.addBitrev(0);
    }

    /* 2 bytes footer: CC2420's CRC */
    if (WITH_FOOTER) {
      cc2420Data[pos++] = (byte) cc2420CRC.getCRCHi();
      cc2420Data[pos++] = (byte) cc2420CRC.getCRCLow();
    }

    byte cc2420DataStripped[] = new byte[pos];
    System.arraycopy(cc2420Data, 0, cc2420DataStripped, 0, pos);

View Full Code Here

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