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标题: 查表法 Modbus CRC16 算法 [打印本页]
作者: KServer    时间: 2021-10-6 13:39
标题: 查表法 Modbus CRC16 算法
查表法比较简单，根据C源码改过来的，modbus 多项式 crc16


若返回值需要正整数直接将 子程序返回参数类型由 “短整数型” 改成 “整数型”

  
子程序名返回值类型公开备 注
ModbusCRC短整数型 'KServer Modbus RTU CRC16
参数名类 型参考可空数组备 注
数据字节集
变量名类 型静态数组备 注
TabH字节集 
TabL字节集 
index整数型 
crcl字节型 
crch字节型 
i整数型 
crch ＝ 255
crcl ＝ 255
TabH ＝ { 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64, 0, 193, 129, 64, 1, 192, 128, 65, 0, 193, 129, 64, 1, 192, 128, 65, 1, 192, 128, 65, 0, 193, 129, 64 }
TabL ＝ { 0, 192, 193, 1, 195, 3, 2, 194, 198, 6, 7, 199, 5, 197, 196, 4, 204, 12, 13, 205, 15, 207, 206, 14, 10, 202, 203, 11, 201, 9, 8, 200, 216, 24, 25, 217, 27, 219, 218, 26, 30, 222, 223, 31, 221, 29, 28, 220, 20, 212, 213, 21, 215, 23, 22, 214, 210, 18, 19, 211, 17, 209, 208, 16, 240, 48, 49, 241, 51, 243, 242, 50, 54, 246, 247, 55, 245, 53, 52, 244, 60, 252, 253, 61, 255, 63, 62, 254, 250, 58, 59, 251, 57, 249, 248, 56, 40, 232, 233, 41, 235, 43, 42, 234, 238, 46, 47, 239, 45, 237, 236, 44, 228, 36, 37, 229, 39, 231, 230, 38, 34, 226, 227, 35, 225, 33, 32, 224, 160, 96, 97, 161, 99, 163, 162, 98, 102, 166, 167, 103, 165, 101, 100, 164, 108, 172, 173, 109, 175, 111, 110, 174, 170, 106, 107, 171, 105, 169, 168, 104, 120, 184, 185, 121, 187, 123, 122, 186, 190, 126, 127, 191, 125, 189, 188, 124, 180, 116, 117, 181, 119, 183, 182, 118, 114, 178, 179, 115, 177, 113, 112, 176, 80, 144, 145, 81, 147, 83, 82, 146, 150, 86, 87, 151, 85, 149, 148, 84, 156, 92, 93, 157, 95, 159, 158, 94, 90, 154, 155, 91, 153, 89, 88, 152, 136, 72, 73, 137, 75, 139, 138, 74, 78, 142, 143, 79, 141, 77, 76, 140, 68, 132, 133, 69, 135, 71, 70, 134, 130, 66, 67, 131, 65, 129, 128, 64 }
计次循环首 (取字节集长度 (数据), i)
index ＝ 位异或 (crcl, 数据 [i]) ＋ 1
crcl ＝ 位异或 (crch, TabH [index])
crch ＝ TabL [index]
计次循环尾 ()
返回 (位或 (左移 (crch, 8), crcl))



C 代码，可直接用在单片机中
  1. static uint16_t const  TabH[] = {  //CRC高位字节值表
  2.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
  3.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
  4.         0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
  5.         0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
  6.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
  7.         0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
  8.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
  9.         0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
  10.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
  11.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
  12.         0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
  13.         0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
  14.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
  15.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
  16.         0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
  17.         0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
  18.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
  19.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
  20.         0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
  21.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
  22.         0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
  23.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
  24.         0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
  25.         0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
  26.         0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
  27.         0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
  28. } ;
  29. static uint16_t const TabL[] = {  //CRC低位字节值表
  30.         0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
  31.         0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
  32.         0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
  33.         0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
  34.         0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
  35.         0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
  36.         0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
  37.         0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
  38.         0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
  39.         0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
  40.         0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
  41.         0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
  42.         0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
  43.         0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
  44.         0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
  45.         0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
  46.         0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
  47.         0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
  48.         0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
  49.         0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
  50.         0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
  51.         0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
  52.         0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
  53.         0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
  54.         0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
  55.         0x43, 0x83, 0x41, 0x81, 0x80, 0x40
  56. } ;
复制代码

  1. uint16_t CRC16(uint8_t* ptr, int len) {
  2.         uint16_t index;
  3.         uint8_t crcl = 0xFF;  //高CRC字节
  4.         uint8_t crch = 0xFF;  //低CRC字节
  5.         while(len--) {  //计算指定长度的CRC
  6.                 index = crcl ^ *ptr++;
  7.                 crcl = crch ^ TabH[index];
  8.                 crch = TabL[index];
  9.         }
  10.         return ((crch << 8) | crcl);
  11. }
复制代码

CRC 在线计算 ：
  1. http://www.ip33.com/crc.html
复制代码

作者: quary888    时间: 2021-10-6 18:11
谢谢楼主分享！！！
好人一生平安！！！
作者: 单色    时间: 2021-10-7 04:05
666666666666666
作者: S777    时间: 2021-10-7 21:30
啊撒旦飞洒发顺丰阿斯顿撒
作者: 懒人定制软件    时间: 2021-10-11 01:01
大神，请收下我的膝盖  
作者: huahuayu    时间: 2021-10-11 14:50

支持你，神一样的男人
作者: 124149449    时间: 2021-10-12 01:01
全论坛易友发来贺电
作者: 懒人定制软件    时间: 2021-10-12 01:04
感谢你的支持，精易有你更精彩  
作者: cf2010    时间: 2022-1-12 06:47
源码分享威武
作者: gaotian456    时间: 2022-5-2 12:52
可以用，查表法比较简单modbus 多项式 crc16
作者: b8008    时间: 2022-8-7 21:17
作者: Else    时间: 2024-7-28 15:42
高低位没有更换



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