crc16

unsigned int BOOT_CRC_Cnt=0x1021;   //累计 接收固件CRC  

unsigned int crc16_compute(unsigned char const * p_data, unsigned char size, unsigned int const * p_crc)
{
    unsigned int crc = (p_crc == NULL) ? 0xFFFF : *p_crc;

    for (unsigned char i = 0; i < size; i++)
    {
        crc  = (unsigned char)(crc >> 8) | (crc << 8);
        crc ^= p_data[i];
        crc ^= (unsigned char)(crc & 0xFF) >> 4;
        crc ^= (crc << 8) << 4;
        crc ^= ((crc & 0xFF) << 4) << 1;
    }
    return crc;
}

BOOT_CRC_Cnt = crc16_compute(BOOT_data_buf,BOOT_BYTE_Cnt,&BOOT_CRC_Cnt);//crc