Checksum

unsigned char xx[] = {0x01,0x5a,0x5a,0x03,0x08,0x2A, 0x00,0x01
                                          ,0x00,0xF8,0x00,0xF6,0x57,0x00,0X00,0xE5};

typedef unsigned short  U16;
typedef unsigned char   U8;

U16 CRC_kjh;
U16 crc16_update(U16 crc, U8 a);

int main()
{
            U16 crc,k;
            crc = 0xFFFF;
            for (k=0; k<1; k++) crc = crc16_update(crc, xx[k]);
            CRC_kjh = crc;
}

U16 crc16_update(U16 crc, U8 a)
{
            int j;
            crc ^=a;
                        for (j = 0; j < 8; ++j)
                       {
                              if (crc & 1) crc = (crc >> 1) ^ 0x8408;
                              else crc = (crc >> 1);
                       }
             return crc;
}

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