Crc¶

1. crc16 modbus 查看...查看...

   static unsigned char crc16_hi_table[256] = {
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
       0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
   };
   
   static unsigned char crc16_lo_table[256] = {
       0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2,
       0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04,
       0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
       0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8,
       0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
       0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
       0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6,
       0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10,
       0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
       0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
       0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE,
       0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
       0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA,
       0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C,
       0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
       0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0,
       0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62,
       0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
       0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE,
       0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
       0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
       0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C,
       0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76,
       0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
       0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
       0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54,
       0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
       0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98,
       0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A,
       0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
       0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86,
       0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40
   };
   
   static unsigned short crc16(unsigned char *buffer, unsigned short len)
   {
       unsigned char crc_hi = 0xFF;
       unsigned char crc_lo = 0xFF;
       unsigned index;
       while (len--)
       {
           index = crc_hi ^ (unsigned char)(*buffer++);
           crc_hi = crc_lo ^ crc16_hi_table[index];
           crc_lo = crc16_lo_table[index];
       }
       return (crc_hi << 8 | crc_lo);
   }