版主，帮忙，关于crc16的问题

我在一nxp芯片的文档里看到其通信校验方式是这样的
验方式是crc16,多项式x16+x12+x5+1，初值0xffff
后面还给了一个例子
0x03,0xe6 这两个数的crc16是0x17,0xa7
我找了很多计算工具，都得不到这个答案，请问这个校验值到底是怎么算出来的

哈哈，强大的HotWC3
http://www.hotpower.org/HotAjax/HotPower_HotAjax.html

这个是crc16_x25!
多项式=右移CRC16=X16+X12+X5+1
简写=CRCR16_8408_FFFF_FFFF
权值=0x8408
初值=0xffff
出值=0xffff

CRC16_x25(03e6)=0xA717

因为是小端模式，即
CRC16_x25(03e6)=17A7
或
CRC16_x25(0xe603)=0xA717

注意上面的两种写法，0x表示为一个16位的数，不带“0x”的表示为数的序列

http://www.hotpower.org/HotAjax/HotPower_HotAjax.html
自动生成的大表源代码：

复制

//CRC位域8表(小端):

const unsigned int CRCR16_8408_Table[256] = {

0x0000,0x1189,0x2312,0x329B,0x4624,0x57AD,0x6536,0x74BF,0x8C48,0x9DC1,0xAF5A,0xBED3,0xCA6C,0xDBE5,0xE97E,0xF8F7,

0x1081,0x0108,0x3393,0x221A,0x56A5,0x472C,0x75B7,0x643E,0x9CC9,0x8D40,0xBFDB,0xAE52,0xDAED,0xCB64,0xF9FF,0xE876,

0x2102,0x308B,0x0210,0x1399,0x6726,0x76AF,0x4434,0x55BD,0xAD4A,0xBCC3,0x8E58,0x9FD1,0xEB6E,0xFAE7,0xC87C,0xD9F5,

0x3183,0x200A,0x1291,0x0318,0x77A7,0x662E,0x54B5,0x453C,0xBDCB,0xAC42,0x9ED9,0x8F50,0xFBEF,0xEA66,0xD8FD,0xC974,

0x4204,0x538D,0x6116,0x709F,0x0420,0x15A9,0x2732,0x36BB,0xCE4C,0xDFC5,0xED5E,0xFCD7,0x8868,0x99E1,0xAB7A,0xBAF3,

0x5285,0x430C,0x7197,0x601E,0x14A1,0x0528,0x37B3,0x263A,0xDECD,0xCF44,0xFDDF,0xEC56,0x98E9,0x8960,0xBBFB,0xAA72,

0x6306,0x728F,0x4014,0x519D,0x2522,0x34AB,0x0630,0x17B9,0xEF4E,0xFEC7,0xCC5C,0xDDD5,0xA96A,0xB8E3,0x8A78,0x9BF1,

0x7387,0x620E,0x5095,0x411C,0x35A3,0x242A,0x16B1,0x0738,0xFFCF,0xEE46,0xDCDD,0xCD54,0xB9EB,0xA862,0x9AF9,0x8B70,

0x8408,0x9581,0xA71A,0xB693,0xC22C,0xD3A5,0xE13E,0xF0B7,0x0840,0x19C9,0x2B52,0x3ADB,0x4E64,0x5FED,0x6D76,0x7CFF,

0x9489,0x8500,0xB79B,0xA612,0xD2AD,0xC324,0xF1BF,0xE036,0x18C1,0x0948,0x3BD3,0x2A5A,0x5EE5,0x4F6C,0x7DF7,0x6C7E,

0xA50A,0xB483,0x8618,0x9791,0xE32E,0xF2A7,0xC03C,0xD1B5,0x2942,0x38CB,0x0A50,0x1BD9,0x6F66,0x7EEF,0x4C74,0x5DFD,

0xB58B,0xA402,0x9699,0x8710,0xF3AF,0xE226,0xD0BD,0xC134,0x39C3,0x284A,0x1AD1,0x0B58,0x7FE7,0x6E6E,0x5CF5,0x4D7C,

0xC60C,0xD785,0xE51E,0xF497,0x8028,0x91A1,0xA33A,0xB2B3,0x4A44,0x5BCD,0x6956,0x78DF,0x0C60,0x1DE9,0x2F72,0x3EFB,

0xD68D,0xC704,0xF59F,0xE416,0x90A9,0x8120,0xB3BB,0xA232,0x5AC5,0x4B4C,0x79D7,0x685E,0x1CE1,0x0D68,0x3FF3,0x2E7A,

0xE70E,0xF687,0xC41C,0xD595,0xA12A,0xB0A3,0x8238,0x93B1,0x6B46,0x7ACF,0x4854,0x59DD,0x2D62,0x3CEB,0x0E70,0x1FF9,

0xF78F,0xE606,0xD49D,0xC514,0xB1AB,0xA022,0x92B9,0x8330,0x7BC7,0x6A4E,0x58D5,0x495C,0x3DE3,0x2C6A,0x1EF1,0x0F78

};

//CRC位域8查表算法(小端):

unsigned int GetCRCR16_8408_FFFF_FFFF_Table(unsigned char *crcBuff, unsigned char crcLen) {

unsigned char i;

unsigned int crc = 0xFFFF;

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

crc = (crc >> 8) ^ CRCR16_8408_Table[(crc & 0xFF) ^ crcBuff];

}

crc ^= 0xFFFF;

return crc;

}

void main() {

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

unsigned int crc;

crc = GetCRCR16_8408_FFFF_FFFF_Table((unsigned char *)dataTable, sizeof(dataTable) - 1);

while(1);

}

http://www.hotpower.org/HotAjax/HotPower_HotAjax.html
自动生成的小表源代码：

复制

 

//CRC位域4表(小端):

const unsigned int CRCR16_8408_Table[16] = {

  0x0000,0x1081,0x2102,0x3183,0x4204,0x5285,0x6306,0x7387,0x8408,0x9489,0xA50A,0xB58B,0xC60C,0xD68D,0xE70E,0xF78F

};

//CRC位域4查表算法(小端):

unsigned int GetCRCR16_8408_FFFF_FFFF_Table(unsigned char *crcBuff, unsigned char crcLen) {

unsigned char i;

unsigned int crc = 0xFFFF;

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) ^ CRCR16_8408_Table[(crc & 0x0F) ^ crcTemp];

  }

  crc ^= 0xFFFF;

  return crc;

}

void main() {

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

unsigned int crc;

  crc = GetCRCR16_8408_FFFF_FFFF_Table((unsigned char *)dataTable, sizeof(dataTable) - 1);

  while(1);

}

:victory菜农给力

哈哈哈...................LZ问对人了！强大的WC3！

这样的楼主以后不要回复他的问题。

请问这个神奇又强大的工具去哪里旅游了，打不开啊@@

http://www.hotpage.com.cn/hotcrc