继电器crc校验代码

unsigned int CrcCheck(unsigned char *mData,unsigned short mSize)
{
unsigned int i,j;
unsigned char crcL=0,crcH=0;
unsigned char saveH=0,saveL=0;
crcL = 0xFF;
crcH = 0XFF;
for(i=0;i<mSize;i++)
{
crcL = crcL ^ mData[i];

for(j=0;j<8;j++)
{
saveH = crcH;
saveL = crcL;
crcH >>=1;
crcL >>=1;
if((saveH & 1) == 1)
{
crcL |=0x80;
}
if((saveL & 1) == 1)
{
crcH ^=0XA0;
crcL ^=1;
}
}
}
unsigned short dd = ( crcH << 8 )| crcL;
return ( crcH << 8 )| crcL;
}