43 lines
1.4 KiB
C#
43 lines
1.4 KiB
C#
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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 DM_Weight.Common
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{
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public class CRC16MODBUS
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{
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/// Name: CRC-16/MODBUS x16+x15+x2+1
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/// Poly: 0x8005
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/// Init: 0xFFFF
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/// Refin: true
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/// Refout: true
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/// Xorout: 0x0000
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///******************************添加数据CRC16MODBUS校验位*******************************************
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public static byte[] CrcModBus(byte[] buffer, int start = 0, int len = 0)
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{
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if (buffer == null || buffer.Length == 0) return null;
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if (start < 0) return null;
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if (len == 0) len = buffer.Length - start;
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int length = start + len;
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if (length > buffer.Length) return null;
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ushort crc = 0xFFFF;// Initial value
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for (int i = start; i < length; i++)
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{
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crc ^= buffer[i];
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for (int j = 0; j < 8; j++)
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{
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if ((crc & 1) > 0)
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crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005
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else
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crc = (ushort)(crc >> 1);
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}
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}
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byte[] ret = BitConverter.GetBytes(crc);
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//Array.Reverse(ret);
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return ret;
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}
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}
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}
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