DS18B20的CRC校验程序(查表)

只看该作者 · 2011-8-21 17:39

本人还不会用C,大家将就着看,欢迎指正!
check_crc: ;CRC检验子程序
   ;R1,需校验的数据首字节地址
   ;R2,需校验的字节总数
   ;R3,CRC寄存器
  MOV R1,#temp_l ;temp_l为温度数据的低八位
  MOV R2,#9
  MOV R3,#00H
  MOV DPTR,#tab_crc
CRC:
  MOV A,@R1
  XRL A,R3
  MOVC A,@A+DPTR
  MOV R3,A
  INC R1
  DJNZ R2,CRC
  mov a,r3
  jnz err_crc ;err_crc为校验出错子程序
  ret

;以下为CRC的数据表格
tab_crc:
DB  0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65
DB 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220
DB 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98
DB 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255
DB 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7
DB 219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154
DB 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36
DB 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185
DB 140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205
DB 17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80
DB 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238
DB 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115
DB 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139
DB 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22
DB 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168
DB 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53

  ret

只看该作者 · 2011-8-21 17:40

数据表后面多了一个 ret

2万 · 2011-8-21 17:48

用http://www.hotpower.net/HotPower_HotAjax.html自动生成呀。
选择crc8_maxim
功能：CRC位域表及算法
文件选:".c"

点击“大表”：

复制



//CRC位域8表(小端):

const unsigned char CRCR8_8C_Table[256] = {

  0x00,0x5E,0xBC,0xE2,0x61,0x3F,0xDD,0x83,0xC2,0x9C,0x7E,0x20,0xA3,0xFD,0x1F,0x41,

  0x9D,0xC3,0x21,0x7F,0xFC,0xA2,0x40,0x1E,0x5F,0x01,0xE3,0xBD,0x3E,0x60,0x82,0xDC,

  0x23,0x7D,0x9F,0xC1,0x42,0x1C,0xFE,0xA0,0xE1,0xBF,0x5D,0x03,0x80,0xDE,0x3C,0x62,

  0xBE,0xE0,0x02,0x5C,0xDF,0x81,0x63,0x3D,0x7C,0x22,0xC0,0x9E,0x1D,0x43,0xA1,0xFF,

  0x46,0x18,0xFA,0xA4,0x27,0x79,0x9B,0xC5,0x84,0xDA,0x38,0x66,0xE5,0xBB,0x59,0x07,

  0xDB,0x85,0x67,0x39,0xBA,0xE4,0x06,0x58,0x19,0x47,0xA5,0xFB,0x78,0x26,0xC4,0x9A,

  0x65,0x3B,0xD9,0x87,0x04,0x5A,0xB8,0xE6,0xA7,0xF9,0x1B,0x45,0xC6,0x98,0x7A,0x24,

  0xF8,0xA6,0x44,0x1A,0x99,0xC7,0x25,0x7B,0x3A,0x64,0x86,0xD8,0x5B,0x05,0xE7,0xB9,

  0x8C,0xD2,0x30,0x6E,0xED,0xB3,0x51,0x0F,0x4E,0x10,0xF2,0xAC,0x2F,0x71,0x93,0xCD,

  0x11,0x4F,0xAD,0xF3,0x70,0x2E,0xCC,0x92,0xD3,0x8D,0x6F,0x31,0xB2,0xEC,0x0E,0x50,

  0xAF,0xF1,0x13,0x4D,0xCE,0x90,0x72,0x2C,0x6D,0x33,0xD1,0x8F,0x0C,0x52,0xB0,0xEE,

  0x32,0x6C,0x8E,0xD0,0x53,0x0D,0xEF,0xB1,0xF0,0xAE,0x4C,0x12,0x91,0xCF,0x2D,0x73,

  0xCA,0x94,0x76,0x28,0xAB,0xF5,0x17,0x49,0x08,0x56,0xB4,0xEA,0x69,0x37,0xD5,0x8B,

  0x57,0x09,0xEB,0xB5,0x36,0x68,0x8A,0xD4,0x95,0xCB,0x29,0x77,0xF4,0xAA,0x48,0x16,

  0xE9,0xB7,0x55,0x0B,0x88,0xD6,0x34,0x6A,0x2B,0x75,0x97,0xC9,0x4A,0x14,0xF6,0xA8,

  0x74,0x2A,0xC8,0x96,0x15,0x4B,0xA9,0xF7,0xB6,0xE8,0x0A,0x54,0xD7,0x89,0x6B,0x35

};

//CRC位域8查表算法(小端):

unsigned char GetCRCR8_8C_00_00_Table(unsigned char *crcBuff, unsigned char crcLen) {

unsigned char i;

unsigned char crc = 0x00;

  for(i = 0; i < crcLen; i ++) {

    crc = CRCR8_8C_Table[crc ^ crcBuff[i]];

  }

  return crc;

}

void main() {

const unsigned char dataTable[] = "\x01\x23\x45\x67\x89\xAB\xCD\xEF";

unsigned char crc;

  crc = GetCRCR8_8C_00_00_Table((unsigned char *)dataTable, sizeof(dataTable) - 1);

  while(1);

}

2万 · 2011-8-21 17:49

用http://www.hotpower.net/HotPower_HotAjax.html自动生成呀。
选择crc8_maxim
功能：CRC位域表及算法
文件选:".c"

点击“小表”：

复制



//CRC位域4表(小端):

const unsigned char CRCR8_8C_Table[16] = {

  0x00,0x9D,0x23,0xBE,0x46,0xDB,0x65,0xF8,0x8C,0x11,0xAF,0x32,0xCA,0x57,0xE9,0x74

};

//CRC位域4查表算法(小端):

unsigned char GetCRCR8_8C_00_00_Table(unsigned char *crcBuff, unsigned char crcLen) {

unsigned char i;

unsigned char crc = 0x00;

unsigned char crcTemp;

  for(i = 0; i < (crcLen * 2); i ++) {

    if (i & 1) crcTemp = crcBuff[i >> 1] >> 4;

    else crcTemp = crcBuff[i >> 1] & 0x0F;

    crc = (crc >> 4) ^ CRCR8_8C_Table[(crc & 0x0F) ^ crcTemp];

  }

  return crc;

}

void main() {

const unsigned char dataTable[] = "\x01\x23\x45\x67\x89\xAB\xCD\xEF";

unsigned char crc;

  crc = GetCRCR8_8C_00_00_Table((unsigned char *)dataTable, sizeof(dataTable) - 1);

  while(1);

}

2万 · 2011-8-21 17:51

用http://www.hotpower.net/HotPower_HotAjax.html自动生成呀。
选择crc8_maxim
功能：CRC位域表及算法
文件选:".txt"

点击“大表”：

复制



//CRC位域8表(小端):

const unsigned char CRCR8_8C_Table[256] = {

  0x00,0x5E,0xBC,0xE2,0x61,0x3F,0xDD,0x83,0xC2,0x9C,0x7E,0x20,0xA3,0xFD,0x1F,0x41,

  0x9D,0xC3,0x21,0x7F,0xFC,0xA2,0x40,0x1E,0x5F,0x01,0xE3,0xBD,0x3E,0x60,0x82,0xDC,

  0x23,0x7D,0x9F,0xC1,0x42,0x1C,0xFE,0xA0,0xE1,0xBF,0x5D,0x03,0x80,0xDE,0x3C,0x62,

  0xBE,0xE0,0x02,0x5C,0xDF,0x81,0x63,0x3D,0x7C,0x22,0xC0,0x9E,0x1D,0x43,0xA1,0xFF,

  0x46,0x18,0xFA,0xA4,0x27,0x79,0x9B,0xC5,0x84,0xDA,0x38,0x66,0xE5,0xBB,0x59,0x07,

  0xDB,0x85,0x67,0x39,0xBA,0xE4,0x06,0x58,0x19,0x47,0xA5,0xFB,0x78,0x26,0xC4,0x9A,

  0x65,0x3B,0xD9,0x87,0x04,0x5A,0xB8,0xE6,0xA7,0xF9,0x1B,0x45,0xC6,0x98,0x7A,0x24,

  0xF8,0xA6,0x44,0x1A,0x99,0xC7,0x25,0x7B,0x3A,0x64,0x86,0xD8,0x5B,0x05,0xE7,0xB9,

  0x8C,0xD2,0x30,0x6E,0xED,0xB3,0x51,0x0F,0x4E,0x10,0xF2,0xAC,0x2F,0x71,0x93,0xCD,

  0x11,0x4F,0xAD,0xF3,0x70,0x2E,0xCC,0x92,0xD3,0x8D,0x6F,0x31,0xB2,0xEC,0x0E,0x50,

  0xAF,0xF1,0x13,0x4D,0xCE,0x90,0x72,0x2C,0x6D,0x33,0xD1,0x8F,0x0C,0x52,0xB0,0xEE,

  0x32,0x6C,0x8E,0xD0,0x53,0x0D,0xEF,0xB1,0xF0,0xAE,0x4C,0x12,0x91,0xCF,0x2D,0x73,

  0xCA,0x94,0x76,0x28,0xAB,0xF5,0x17,0x49,0x08,0x56,0xB4,0xEA,0x69,0x37,0xD5,0x8B,

  0x57,0x09,0xEB,0xB5,0x36,0x68,0x8A,0xD4,0x95,0xCB,0x29,0x77,0xF4,0xAA,0x48,0x16,

  0xE9,0xB7,0x55,0x0B,0x88,0xD6,0x34,0x6A,0x2B,0x75,0x97,0xC9,0x4A,0x14,0xF6,0xA8,

  0x74,0x2A,0xC8,0x96,0x15,0x4B,0xA9,0xF7,0xB6,0xE8,0x0A,0x54,0xD7,0x89,0x6B,0x35

};