CRC-16/MODBUS 与 CRC-16/CCITT-FALSE 校验位 计算

CRC-16/MODBUS  与  CRC-16/CCITT-FALSE 校验位 计算

#include "stdafx.h"
#include <windows.h>// CRC-16/MODBUS 第一种方式
static const UCHAR aucCRCHi[] = {0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,0x00, 0xC1, 0x81, 0x40};static const UCHAR aucCRCLo[] = {0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,0x41, 0x81, 0x80, 0x40
};USHORT usMBCRC16(UCHAR * pucFrame, USHORT usLen)
{UCHAR ucCRCHi = 0xFF;UCHAR ucCRCLo = 0xFF;int iIndex;while (usLen--){iIndex = ucCRCLo ^ *(pucFrame++);ucCRCLo = (UCHAR)(ucCRCHi ^ aucCRCHi[iIndex]);ucCRCHi = aucCRCLo[iIndex];}return (USHORT)(ucCRCHi << 8 | ucCRCLo);
}
//// CRC-16/MODBUS 第二种方式/*
* 函数名 :CRC16
* 描述 : 计算CRC16
* 输入 : ptr---数据,len---长度
* 输出 : 校验值
*/
UINT16 CRC16(UINT8 *ptr, UINT16 len)
{unsigned char i;unsigned short crc = 0xFFFF;if (len == 0) {len = 1;}while (len--) {crc ^= *ptr;for (i = 0; i < 8; i++){if (crc & 1) {crc >>= 1;crc ^= 0xA001;}else {crc >>= 1;}}ptr++;}return(crc);
}
///CRC-16/CCITT-FALSE 第一种方式/
/*
* CRC-16/CCITT-FALSE x16+x12+x5+1 算法
* info
* Name:CRC-16/CCITT-FAI
* Width:16
* Poly:0x1021
* Init:0xFFFF
* RefIn:False
* RefOut:False
* XorOut:0x0000
* @param pucFrame ,要计算CRC数据数组
* @param offset ,数据计算CRC的起始位
* @param usLen ,数据计算CRC的范围长度
* @return
*/UINT16 crc_16_CCITT_False(UCHAR * pucFrame,int offset ,USHORT usLen) 
{int start = offset; //选择数据要计算CRC的起始位int end = offset + usLen; //选择数据要CRC计算的范围段unsigned short  crc = 0xffff; // initial valueunsigned short  polynomial = 0x1021; // poly valuefor (int index = start; index < end; index++) {byte b = pucFrame[index];for (int i = 0; i < 8; i++) {boolean bit = ((b >> (7 - i) & 1) == 1);boolean c15 = ((crc >> 15 & 1) == 1);crc <<= 1;if (c15 ^ bit)crc ^= polynomial;}}crc &= 0xffff;return crc;
}
// CRC校验是否通过///
/***
* CRC校验是否通过
*
* @param srcByte
* @param length(验证码字节长度)
* @return
*/bool isPassCRC(UCHAR* srcByte, int offset, int length)
{// 取出除crc校验位的其他数组，进行计算，得到CRC校验结果UINT16 calcCRC = crc_16_CCITT_False(srcByte, offset, length);byte bytes[2];bytes[0] = (byte)((calcCRC >> 8) & 0xff);bytes[1] = (byte)(calcCRC & 0xff);// 取出CRC校验位，进行计算int i = length;byte b[2] = { srcByte[i], srcByte[i + 1] };// 比较return bytes[0] == b[0] && bytes[1] == b[1];
}
/int _tmain(int argc, _TCHAR* argv[])
{//CRC-16/MODBUS 第一种方式unsigned char Contrl_IO5_ON[5] = { 0xAA, 0x07, 0x02, 0x02, 0x01};UINT8 data[23] = { 0x7E, 0x01, 0x00, 0x00, 0x01, 0x10, 0x02, 0x00,0x27, 0x00, 0x0C, 0x00, 0x02, 0x00, 0x00, 0x00,0x00, 0x00, 0x50, 0x00, 0x3C, 0x00, 0x03 };USHORT aa=usMBCRC16(Contrl_IO5_ON, 5);printf("CRC-16/MODBUS aa:[%04x]\n", aa);//CRC-16/MODBUS 第二种方式UINT16 bb = CRC16(Contrl_IO5_ON, 5);printf("CRC-16/MODBUS bb:[%04x]\n", bb);//CRC-16/CCITT-FALSE 第一种方式,USHORT cc =crc_16_CCITT_False(Contrl_IO5_ON,0,5);printf("CRC-16/CCITT-FALSE cc:[%04x]\n", cc);//验证接收数据的CRC-16/CCITT-FALSE值,最后2位是CRC值 0x34,0xC8unsigned char ReceivingDate[7] = { 0xAA, 0x07, 0x02, 0x02, 0x01, 0x34, 0xC8 };bool dd=isPassCRC(ReceivingDate, 0, 5);printf("isPassCRC() dd:[%d]\n", dd);//可以在线验证算出的结果：http://www.ip33.com/crc.html return 0;
}

    //可以在线验证算出的结果：http://www.ip33.com/crc.html