packetcrc.java

初始化传感器节点

package com.mars.tools;

import com.mars.net.MotePacket;

public class PacketCRC {
	
	public static int calcByte(int crc,int b){ 
		
		crc=crc^(int)b<<8; 
		
		for(int i=0;i<8;i++){
			if ((crc&0x8000)==0x8000)
				crc=crc<<1^0x1021; 
			else 
				crc=crc<<1; 
		}
		return crc&0xffff; 
	}
	
	public static int calc(MotePacket packet,int index,int count){ 
		
		int crc=0; 
		
		while(count>0){ 
			crc=calcByte(crc,packet.getPacketElement(index++)); 
			count--; 
		}
		
		return crc; 
	}
	
	/*public static void main(String[] args){
		
		LinkedList<Integer> list=new LinkedList<Integer>();
		
		list.add(new Integer(0x7E));
		list.add(new Integer(0x42));
		list.add(new Integer(0x7D));
		list.add(new Integer(0x5E));
		list.add(new Integer(0x00));
		list.add(new Integer(0xFD));
		list.add(new Integer(0x7D));
		list.add(new Integer(0x5D));
		list.add(new Integer(0x02));
		list.add(new Integer(0x01));
		list.add(new Integer(0x00));
		list.add(new Integer(0x11));
		list.add(new Integer(0xF7));
		list.add(new Integer(0x7E));
		
		MotePacket packet=new MotePacket(list);
		packet.showPacket();
		packet.verify();
//		System.out.print(calc(packet,0,8));
		
	}*/

}