crc16 with word & byte--查表法

#1, BYTE CRC

参考：

https://blog.csdn.net/m0_37697335/article/details/113267780?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522F1451286-1B97-44AA-A5FC-386045B4939B%2522%252C%2522scm%2522%253A%252220140713.130102334...%2522%257D\&request_id=F1451286-1B97-44AA-A5FC-386045B4939B\&biz_id=0\&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend\~default-1-113267780-null-null.142^v100^pc_search_result_base9\&utm_term=crc16 modbus查表法 c语言\&spm=1018.2226.3001.4187
注意表格不对，会有错误。

/MODBUS******************

• Name: CRC-16/MODBUS x16+x15+x2+1

• Width: 16

• Poly: 0x8005

• Init: 0xFFFF

• Refin: True

• Refout: True

• Xorout: 0x0000

• Note:

  *****************************************************************************/

  WORD CRC_GetModbus16(BYTE * pData, WORD nLength)

  {

  WORD cRc_16 = 0xFFFF, i;

  BYTE temp;

  for (i = 0; i < nLength; ++i)

  {

  temp = (BYTE)(cRc_16 & 0xFF);

  cRc_16 = (WORD)((cRc_16 >> 8) ^ crc16tab[(temp ^ pData[i]) & 0xFF]);

  }

  return cRc_16;

  }

  #2， WORD CRC