EmergencyPlatform/ModbusCRC16.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Guidaoji
{
    internal class ModbusCRC16
    {
        public static ushort CalculateCrc(byte[] bytes)
        {
            const ushort polynomial = 0xA001;
            ushort crc = 0xFFFF;
            for (int i = 0; i < bytes.Length; i++)
            {
                crc ^= (ushort)(bytes[i] & 0xFF);
                for (int j = 0; j < 8; j++)
                {
                    if ((crc & 0x0001) == 0x0001)
                    {
                        crc >>= 1;
                        crc ^= polynomial;
                    }
                    else
                    {
                        crc >>= 1;
                    }
                }
            }
            return crc;
        }
    }
}