1 private byte[] CRC(byte[] x, int len) //CRC校验函数 2 { 3 byte[] temdata = new byte[2]; 4 UInt16 crc = 0; 5 byte da; 6 int i = 0; 7 UInt16[] yu = { 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 8 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef }; 9 while (len-- != 0)10 {11 12 da = (byte)(((byte)(crc / 256)) / 16);13 crc <<= 4;14 crc ^= yu[da ^ x[i] / 16];15 da = (byte)(((byte)(crc / 256)) / 16);16 crc <<= 4;17 crc ^= yu[da ^ x[i] & 0x0f];18 i++;19 }20 temdata[0] = (byte)(crc & 0xFF);21 temdata[1] = (byte)(crc >> 8);22 return temdata;23 }24 25

 

1 /* 2  3 **************************************************************************** 4  5 函数原型：uint16_t GetCRC16(char * addr,uint32_t length); 6  7 函数功能：计算帧的CRC16校验值  包括帧头和数据段部分 8  9 入口参数： addr：待校验的数据部分起始地址10 11            length：数据长度(bytes)                  12 13 返 回 值： CRC16校验值14 15 注意事项： 无16 17 ****************************************************************************18 19 */20 21 uint16_t GetCRC16(char * addr,uint32_t length)22 23 {24 25  uint16_t crc;26 27  uint8_t da;28 29  uint16_t crc_ta[16]={ /* CRC 余式表 */30 31    0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,32 33    0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef};34 35  36 37   crc = 0;38 39   while(length--!=0)40 41   {42 43       da=((uint8_t)(crc/256))/16; /* 暂存 CRC 的高四位 */44 45       crc <<= 4; /* CRC右移4 位,相当于取CRC 的低12 位）*/46 47       crc ^= crc_ta[da^(*addr/16)]; /* CRC 的高4 位和本字节的前半字节相加后查表计算CRC，然后加上上一次 CRC 的余数 */48 49       da = ((uint8_t)(crc/256))/16; /* 暂存 CRC 的高4 位 */50 51       crc <<= 4; /* CRC 右移4 位， 相当于 CRC 的低12 位） */52 53       crc ^= crc_ta[da^(*addr&0x0f)]; /* CRC 的高4 位和本字节的后半字节相加后查表计算CRC，然后再加上上一次 CRC 的余数 */54 55       addr++;56 57   }58 59     return (crc);

 

1 public class CRC { 2 3     private static int poly = 0x1021;    4     private static int table[] = { /* CRC1021*/     5          0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,    6           0x8108,      7           0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231,      8            0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339,      9            0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462,     10           0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a,     11            0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653,     12            0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b,     13            0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4,     14            0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc,     15            0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5,     16            0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd,     17           0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6,     18            0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae,     19            0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97,     20            0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f,     21            0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188,     22            0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080,     23            0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9,     24            0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1,     25            0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea,     26            0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2,     27            0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db,     28            0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3,     29            0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c,     30            0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844,     31            0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d,     32            0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75,     33            0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e,     34            0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26,     35            0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f,     36            0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17,     37            0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 };  38  39     public static int getCrc(byte[] bs)  40     {  41         int crc =0;  42         43         for(byte b : bs)  44         {  45  46             crc =  ((crc << 8) | b & 0xff) ^ table[ (crc >> 8 ) & 0xff];  47         }  48         return crc & 0xffff;  49     }  50 51     public static void main(String str[])  52     {  53         byte bs[] = new byte[]{0x12,0x34,0x56,0x78,0x00,0x00};  //此时算的是0x123456   结果 b42c54         System.out.println(Integer.toHexString( getCrc(bs)));  55     }  56 }

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