CRC8

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CRC8 计算

//CRC8#define CRC8_POLY 0x31 //Polynomial 0x31(X8 + X5 + X4 + 1)#define CRC8_INIT 0xFF //Initialization 0xFFBYTE CRC8(const void *pInData, int iLen){  BYTE i, crc, *buf = (BYTE *)pInData;  crc = CRC8_INIT; //初值  while(iLen-- > 0)  {    crc=crc^(*buf); buf++;    for(i = 0; i < 8; i++)    {      if(crc & 0x80)      {        crc = (crc<< 1)^CRC8_POLY;      }      else      {        crc = crc<< 1;      }    }  }  return crc;}//生成CRC8表格 BYTE CRC8Table[256]= {0};void GenCrc8Tab(){  for(int i=0; i<256; i++)  {    BYTE tmp = i^CRC8_INIT;     CRC8Table[i] = CRC8(&tmp, 1);  }}//查表法BYTE CRC8T(const void *pInData, int iLen){  BYTE crc = CRC8_INIT, *buf = (BYTE*)pInData;  while(iLen --)  {    crc = CRC8Table[crc ^ *buf]; buf++;  }  return crc;}

//测试函数

void CDlg1Dlg::OnButton1() {  BYTE bVal[]= {0xBE, 0xEF};  BYTE bc = CRC8(bVal, 2);  ASSERT(bc == 0x92U);  GenCrc8Tab();  //输出crc8表  TRACE(_T("\nconst BYTE CRC8Table[256] =\n{"));  for(int i=0; i<256; i++)  {    if(i % 16 == 0)      TRACE(_T("\n  "));    TRACE(_T("0x%02X, "),  CRC8Table[i]);  }  TRACE(_T("\n};\n"));  bc = CRC8T(bVal, 2);  ASSERT(bc == 0x92U);}

//CRC8表格

const BYTE CRC8Table[256] ={  0x00, 0x31, 0x62, 0x53, 0xC4, 0xF5, 0xA6, 0x97, 0xB9, 0x88, 0xDB, 0xEA, 0x7D, 0x4C, 0x1F, 0x2E,   0x43, 0x72, 0x21, 0x10, 0x87, 0xB6, 0xE5, 0xD4, 0xFA, 0xCB, 0x98, 0xA9, 0x3E, 0x0F, 0x5C, 0x6D,   0x86, 0xB7, 0xE4, 0xD5, 0x42, 0x73, 0x20, 0x11, 0x3F, 0x0E, 0x5D, 0x6C, 0xFB, 0xCA, 0x99, 0xA8,   0xC5, 0xF4, 0xA7, 0x96, 0x01, 0x30, 0x63, 0x52, 0x7C, 0x4D, 0x1E, 0x2F, 0xB8, 0x89, 0xDA, 0xEB,   0x3D, 0x0C, 0x5F, 0x6E, 0xF9, 0xC8, 0x9B, 0xAA, 0x84, 0xB5, 0xE6, 0xD7, 0x40, 0x71, 0x22, 0x13,   0x7E, 0x4F, 0x1C, 0x2D, 0xBA, 0x8B, 0xD8, 0xE9, 0xC7, 0xF6, 0xA5, 0x94, 0x03, 0x32, 0x61, 0x50,   0xBB, 0x8A, 0xD9, 0xE8, 0x7F, 0x4E, 0x1D, 0x2C, 0x02, 0x33, 0x60, 0x51, 0xC6, 0xF7, 0xA4, 0x95,   0xF8, 0xC9, 0x9A, 0xAB, 0x3C, 0x0D, 0x5E, 0x6F, 0x41, 0x70, 0x23, 0x12, 0x85, 0xB4, 0xE7, 0xD6,   0x7A, 0x4B, 0x18, 0x29, 0xBE, 0x8F, 0xDC, 0xED, 0xC3, 0xF2, 0xA1, 0x90, 0x07, 0x36, 0x65, 0x54,   0x39, 0x08, 0x5B, 0x6A, 0xFD, 0xCC, 0x9F, 0xAE, 0x80, 0xB1, 0xE2, 0xD3, 0x44, 0x75, 0x26, 0x17,   0xFC, 0xCD, 0x9E, 0xAF, 0x38, 0x09, 0x5A, 0x6B, 0x45, 0x74, 0x27, 0x16, 0x81, 0xB0, 0xE3, 0xD2,   0xBF, 0x8E, 0xDD, 0xEC, 0x7B, 0x4A, 0x19, 0x28, 0x06, 0x37, 0x64, 0x55, 0xC2, 0xF3, 0xA0, 0x91,   0x47, 0x76, 0x25, 0x14, 0x83, 0xB2, 0xE1, 0xD0, 0xFE, 0xCF, 0x9C, 0xAD, 0x3A, 0x0B, 0x58, 0x69,   0x04, 0x35, 0x66, 0x57, 0xC0, 0xF1, 0xA2, 0x93, 0xBD, 0x8C, 0xDF, 0xEE, 0x79, 0x48, 0x1B, 0x2A,   0xC1, 0xF0, 0xA3, 0x92, 0x05, 0x34, 0x67, 0x56, 0x78, 0x49, 0x1A, 0x2B, 0xBC, 0x8D, 0xDE, 0xEF,   0x82, 0xB3, 0xE0, 0xD1, 0x46, 0x77, 0x24, 0x15, 0x3B, 0x0A, 0x59, 0x68, 0xFF, 0xCE, 0x9D, 0xAC, };

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