VLCPlay/CRC.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace VLCPlay
{
    public class CRC
    {
        public static byte[] CRC16(byte[] sendBuff)//CRC校验
        {
            int i1 = 0;
            byte CRC16Lo, CRC16Hi;
            byte CL, CH;
            byte SaveHi, SaveLo;
            int Flag = 0;
            byte[] ReturnData = new byte[2];

            CRC16Lo = 0xFF;
            CRC16Hi = 0xFF;
            CL = 0x1;
            CH = 0xA0;

            for (i1 = 0; i1 < 6; i1++)
            {
                CRC16Lo = (byte)((CRC16Lo) ^ (sendBuff[i1]));//每一个数据与CRC寄存器进行异或
                for (Flag = 0; Flag <= 7; Flag++)
                {
                    SaveHi = CRC16Hi;
                    SaveLo = CRC16Lo;
                    CRC16Hi = (byte)(CRC16Hi >> 1);         //高位右移一位
                    CRC16Lo = (byte)(CRC16Lo >> 1);         //低位右移一位

                    if ((SaveHi & 0x1) == 0x1)              //如果高位字节最后一位为1
                    {
                        CRC16Lo = (byte)(CRC16Lo | 0x80);   //则低位字节右移后前面补1
                    }

                    if ((SaveLo & 0x1) == 0x1)              //如果LSB为1，则与多项式码进行异或
                    {
                        CRC16Hi = (byte)(CRC16Hi ^ CH);
                        CRC16Lo = (byte)(CRC16Lo ^ CL);
                    }
                }
            }

            ReturnData[0] = CRC16Hi;//CRC高位
            ReturnData[1] = CRC16Lo;//CRC低位
            return ReturnData;
        }
    }
}