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/***************************************************** */ |
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/* 22/11/2005 modified by david fedele to include crc control |
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/* ========================================================*/ |
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/* unsigned char crc8_8(unsigned char old,unsigned char data); */ |
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/* int main() */ |
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/* { */ |
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/* unsigned short command[16128]; */ |
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/* int i; */ |
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/* char icc; */ |
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/* int databufferlength; */ |
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/* ... */ |
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/* ... */ |
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|
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/* icc = 0; */ |
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/* for (i =0; i < databufferlenght; i++) */ |
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/* { */ |
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/* icc = crc8_8(icc, command[i]); */ |
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/* } */ |
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/* /\* in icc hai il check code *\/ */ |
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/* ... */ |
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/* ... */ |
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|
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/* return 0; */ |
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/* } */ |
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/***************************************************** */ |
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|
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unsigned char crc8_8(unsigned char old, unsigned char data) |
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{ |
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union crc_word { |
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unsigned char word; |
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struct bit_field_w { |
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/* CRC VME */ |
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/* unsigned b7:1; */ |
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/* unsigned b6:1; */ |
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/* unsigned b5:1; */ |
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/* unsigned b4:1; */ |
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/* unsigned b3:1; */ |
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/* unsigned b2:1; */ |
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/* unsigned b1:1; */ |
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/* unsigned b0:1; */ |
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/* CRC PC */ |
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unsigned b0:1; |
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unsigned b1:1; |
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unsigned b2:1; |
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unsigned b3:1; |
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unsigned b4:1; |
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unsigned b5:1; |
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unsigned b6:1; |
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unsigned b7:1; |
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} bit; |
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} c,d,r; |
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|
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c.word = old; |
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d.word = (unsigned short)data; |
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|
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r.bit.b0 = c.bit.b0 ^ c.bit.b6 ^ c.bit.b7 ^ d.bit.b0 ^ d.bit.b6 ^ d.bit.b7; |
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r.bit.b1 = c.bit.b0 ^ c.bit.b1 ^ c.bit.b6 ^ d.bit.b0 ^ d.bit.b1 ^ d.bit.b6; |
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r.bit.b2 = c.bit.b0 ^ c.bit.b1 ^ c.bit.b2 ^ c.bit.b6 ^ d.bit.b0 ^ d.bit.b1 ^d.bit.b2 ^ d.bit.b6; |
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r.bit.b3 = c.bit.b1 ^ c.bit.b2 ^ c.bit.b3 ^ c.bit.b7 ^ d.bit.b1 ^ d.bit.b2 ^d.bit.b3 ^ d.bit.b7; |
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r.bit.b4 = c.bit.b2 ^ c.bit.b3 ^ c.bit.b4 ^ d.bit.b2 ^ d.bit.b3 ^ d.bit.b4; |
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r.bit.b5 = c.bit.b3 ^ c.bit.b4 ^ c.bit.b5 ^ d.bit.b3 ^ d.bit.b4 ^ d.bit.b5; |
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r.bit.b6 = c.bit.b4 ^ c.bit.b5 ^ c.bit.b6 ^ d.bit.b4 ^ d.bit.b5 ^ d.bit.b6; |
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r.bit.b7 = c.bit.b5 ^ c.bit.b6 ^ c.bit.b7 ^ d.bit.b5 ^ d.bit.b6 ^ d.bit.b7; |
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|
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return r.word; |
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} |
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|
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unsigned char crc16(unsigned char old,unsigned char data) |
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{ |
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static const unsigned int Crc_lookup[256] = { |
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0x0000,0x1021,0x2042,0x3063,0x4084,0x50A5,0x60C6,0x70E7, |
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0x8108,0x9129,0xA14A,0xB16B,0xC18C,0xD1AD,0xE1CE,0xF1EF, |
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0x1231,0x0210,0x3273,0x2252,0x52B5,0x4294,0x72F7,0x62D6, |
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0x9339,0x8318,0xB37B,0xA35A,0xD3BD,0xC39C,0xF3FF,0xE3DE, |
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0x2462,0x3443,0x0420,0x1401,0x64E6,0x74C7,0x44A4,0x5485, |
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0xA56A,0xB54B,0x8528,0x9509,0xE5EE,0xF5CF,0xC5AC,0xD58D, |
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0x3653,0x2672,0x1611,0x0630,0x76D7,0x66F6,0x5695,0x46B4, |
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0xB75B,0xA77A,0x9719,0x8738,0xF7DF,0xE7FE,0xD79D,0xC7BC, |
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0x48C4,0x58E5,0x6886,0x78A7,0x0840,0x1861,0x2802,0x3823, |
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0xC9CC,0xD9ED,0xE98E,0xF9AF,0x8948,0x9969,0xA90A,0xB92B, |
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0x5AF5,0x4AD4,0x7AB7,0x6A96,0x1A71,0x0A50,0x3A33,0x2A12, |
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0xDBFD,0xCBDC,0xFBBF,0xEB9E,0x9B79,0x8B58,0xBB3B,0xAB1A, |
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0x6CA6,0x7C87,0x4CE4,0x5CC5,0x2C22,0x3C03,0x0C60,0x1C41, |
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0xEDAE,0xFD8F,0xCDEC,0xDDCD,0xAD2A,0xBD0B,0x8D68,0x9D49, |
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0x7E97,0x6EB6,0x5ED5,0x4EF4,0x3E13,0x2E32,0x1E51,0x0E70, |
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0xFF9F,0xEFBE,0xDFDD,0xCFFC,0xBF1B,0xAF3A,0x9F59,0x8F78, |
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0x9188,0x81A9,0xB1CA,0xA1EB,0xD10C,0xC12D,0xF14E,0xE16F, |
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0x1080,0x00A1,0x30C2,0x20E3,0x5004,0x4025,0x7046,0x6067, |
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0x83B9,0x9398,0xA3FB,0xB3DA,0xC33D,0xD31C,0xE37F,0xF35E, |
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0x02B1,0x1290,0x22F3,0x32D2,0x4235,0x5214,0x6277,0x7256, |
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0xB5EA,0xA5CB,0x95A8,0x8589,0xF56E,0xE54F,0xD52C,0xC50D, |
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0x34E2,0x24C3,0x14A0,0x0481,0x7466,0x6447,0x5424,0x4405, |
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0xA7DB,0xB7FA,0x8799,0x97B8,0xE75F,0xF77E,0xC71D,0xD73C, |
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0x26D3,0x36F2,0x0691,0x16B0,0x6657,0x7676,0x4615,0x5634, |
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0xD94C,0xC96D,0xF90E,0xE92F,0x99C8,0x89E9,0xB98A,0xA9AB, |
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0x5844,0x4865,0x7806,0x6827,0x18C0,0x08E1,0x3882,0x28A3, |
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0xCB7D,0xDB5C,0xEB3F,0xFB1E,0x8BF9,0x9BD8,0xABBB,0xBB9A, |
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0x4A75,0x5A54,0x6A37,0x7A16,0x0AF1,0x1AD0,0x2AB3,0x3A92, |
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0xFD2E,0xED0F,0xDD6C,0xCD4D,0xBDAA,0xAD8B,0x9DE8,0x8DC9, |
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0x7C26,0x6C07,0x5C64,0x4C45,0x3CA2,0x2C83,0x1CE0,0x0CC1, |
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0xEF1F,0xFF3E,0xCF5D,0xDF7C,0xAF9B,0xBFBA,0x8FD9,0x9FF8, |
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0x6E17,0x7E36,0x4E55,0x5E74,0x2E93,0x3EB2,0x0ED1,0x1EF0 |
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}; |
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|
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unsigned short new; |
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unsigned int temp; |
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temp=old; |
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new=(temp << 8)^(Crc_lookup[(((temp >> 8) & 0xFF)^(unsigned short)data)]); |
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|
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return new; |
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} |
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