updated cc2420 converter to 6 byte xmac headers
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@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: CC2420RadioPacketConverter.java,v 1.9 2009/05/06 12:59:12 fros4943 Exp $
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* $Id: CC2420RadioPacketConverter.java,v 1.10 2009/05/26 13:33:35 fros4943 Exp $
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*/
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package se.sics.cooja.mspmote.interfaces;
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@ -35,6 +35,7 @@ import org.apache.log4j.Logger;
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import se.sics.cooja.ConvertedRadioPacket;
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import se.sics.cooja.RadioPacket;
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import se.sics.cooja.util.StringUtils;
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/**
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* Converts radio packets between X-MAC/CC24240/Sky and COOJA.
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@ -48,7 +49,7 @@ public class CC2420RadioPacketConverter {
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public static final boolean WITH_PREAMBLE = true;
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public static final boolean WITH_SYNCH = true;
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public static final boolean WITH_XMAC = true;
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public static final boolean WITH_CHECKSUM = true;
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public static final boolean WITH_CHECKSUM = false;
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public static final boolean WITH_TIMESTAMP = true;
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public static final boolean WITH_FOOTER = true;
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@ -75,7 +76,7 @@ public class CC2420RadioPacketConverter {
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/* 1 byte length */
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len = (byte) packetData.length;
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if (WITH_XMAC) {
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len += 4;
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len += 6;
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}
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if (WITH_CHECKSUM) {
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len += 2;
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@ -90,12 +91,16 @@ public class CC2420RadioPacketConverter {
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/* (TODO) 4 byte X-MAC */
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if (WITH_XMAC) {
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cc2420Data[pos++] = 0;
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cc2420Data[pos++] = 1; /* TYPE_DATA */
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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cc2420Data[pos++] = 0;
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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cc2420Data[pos++] = 0; /* XXX sender: 0.0 */
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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cc2420Data[pos++] = 0;
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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cc2420Data[pos++] = 0; /* XXX receiver: 0.0 */
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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cc2420Data[pos++] = 0;
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accumulatedCRC = CRCCoder.crc16Add((byte)0, accumulatedCRC);
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}
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@ -157,8 +162,8 @@ public class CC2420RadioPacketConverter {
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/* (IGNORED) 4 byte X-MAC */
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if (WITH_XMAC) {
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pos += 4;
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len -= 4;
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pos += 6;
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len -= 6;
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}
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/* (IGNORED) 2 bytes checksum */
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@ -182,7 +187,7 @@ public class CC2420RadioPacketConverter {
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byte originalData[] = new byte[originalLen];
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System.arraycopy(data, 6, originalData, 0, originalLen);
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if (len < 0) {
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logger.fatal("Negative length radio packet. Conversion failed.");
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logger.warn("No cross-level conversion available: negative packet length");
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return new ConvertedRadioPacket(new byte[0], originalData);
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}
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byte convertedData[] = new byte[len];
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