82 lines
2.7 KiB
C#
82 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace CRClib
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{
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#region 16位CRC校验【CRC】
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/// <summary>
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/// 16位CRC校验
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/// </summary>
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internal class CRC
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{
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/// <summary>
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/// CRC校验,返回添加CRC校验码后的字符串
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/// 适用于485通讯，用于生成CRC校验码。输入16进制字符串；输出CRC校验码
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/// </summary>
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/// <param name="data">十六进制字符串</param>
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/// <returns>modbus-CRC校验码</returns>
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public static String CRCForModbus(string data)
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{
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//处理数字转换
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string sendBuf = data;
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string sendnoNull1 = sendBuf.Trim();//去掉字符串前后的空格
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string sendnoNull2 = sendnoNull1.Replace(" ", "");//去掉字符串中间的空格
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string sendNOComma = sendnoNull2.Replace(',', ' '); //去掉英文逗号
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string sendNOComma1 = sendNOComma.Replace('，', ' '); //去掉中文逗号
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string strSendNoComma2 = sendNOComma1.Replace("0x", ""); //去掉0x
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data = strSendNoComma2.Replace("0X", ""); //去掉0X
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Byte[] crcbuf = strToHexByte(data);
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//计算并填写CRC校验码
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Int32 crc = 0xffff;
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Int32 len = crcbuf.Length;
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for (Int32 n = 0; n < len; n++)
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{
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Byte i;
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crc = crc ^ crcbuf[n];
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for (i = 0; i < 8; i++)
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{
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Int32 TT;
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TT = crc & 1;
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crc = crc >> 1;
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crc = crc & 0x7fff;
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if (TT == 1)
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{
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crc = crc ^ 0xa001;
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}
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crc = crc & 0xffff;
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}
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}
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crc = ((crc & 0xFF) << 8 | (crc >> 8));//高低字节换位
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String CRCString = crc.ToString("X2");
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return (CRCString);
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}
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/// <summary>
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/// 16进制字符串转字节数组
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/// </summary>
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/// <param name="hexString">十六进制字符串</param>
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/// <returns>返回字节数组</returns>
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public static Byte[] strToHexByte(String hexString)
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{
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hexString = hexString.Replace(" ", "");
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if ((hexString.Length % 2) != 0)
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hexString = hexString.Insert(hexString.Length - 1, 0.ToString());
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Byte[] returnBytes = new Byte[hexString.Length / 2];
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for (Int32 i = 0; i < returnBytes.Length; i++)
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returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
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return returnBytes;
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}
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}
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#endregion
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}
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