uint32 CRC(uint8 *data,uint32 len,uint8 width,uint32 poly,uint32 Init,bool RefIn,bool RefOut,uint32 XorOut)
{
    uint32 i,j,crc,topBit;
    uint32 dat,wideMask;
    uint8 bit; 

    topBit=1ul<<(width-1);
    wideMask=topBit|(topBit-1);
    crc=wideMask&Init;
    poly&=wideMask;
    XorOut&=wideMask;
    for(i=0;i<len;i  ){
        dat=*data  ;
        if(RefIn)dat=(uint8)reflect(dat,8);
        for(j=0;j<8;j  ){
            bit=0;
            if(crc&topBit)bit=1;
            if(dat&0x80)bit^=1;
            dat<<=1;
            crc<<=1;
            if(bit)crc^=poly;
        }
    }
    crc&=wideMask;
    if(RefOut)crc=reflect(crc,width);
    return crc^XorOut;
}

CRC效验和计算软件 下载地址
参考网址：http://www.skychip.net/post/2012/06/26/1.aspx