public static ICRC Create(CRCMode mode)
{
ICRC crc = null;
switch (mode)
{
case CRCMode.CRC8:
crc = new CRC8();
break;
}
return crc;
}
/// <summary>
/// 16位CRC检验码生成器
/// </summary>
/// <param name="data">数据</param>
/// <param name="mode">CRC模式</param>
/// <returns>CRC检验码，高位在前</returns>
public static byte[] CRC16(byte[] data, CRCMode mode)
{
ushort crcpoly, crcinit = 0x0000, crcxorout = 0x0000;
bool refin = true, refout = true;
switch (mode)
{
case CRCMode.CCITT:
crcpoly = 0x1021;
break;
case CRCMode.CCITT_FALSE:
crcpoly = 0x1021;
crcinit = 0xFFFF;
refin = false;
refout = false;
break;
case CRCMode.DNP:
crcpoly = 0x3D65;
crcxorout = 0xFFFF;
break;
case CRCMode.IBM:
crcpoly = 0x8005;
break;
case CRCMode.MAXIM:
crcpoly = 0x8005;
crcxorout = 0xFFFF;
break;
case CRCMode.MODBUS:
crcpoly = 0x8005;
crcinit = 0xFFFF;
break;
case CRCMode.USB:
crcpoly = 0x8005;
crcinit = 0xFFFF;
crcxorout = 0xFFFF;
break;
case CRCMode.X25:
crcpoly = 0x1021;
crcinit = 0xFFFF;
crcxorout = 0xFFFF;
break;
case CRCMode.XMODEM:
crcpoly = 0x1021;
refin = false;
refout = false;
break;
default:
crcpoly = 0x8005;
crcinit = 0xFFFF;
break;
}
foreach (byte t in data)
{
byte temp = t;
if (refin)
{
char[] arr = Convert.ToString(temp, 2).PadLeft(8, '0').ToCharArray();
Array.Reverse(arr);
temp = Convert.ToByte(new string(arr), 2);
}
crcinit ^= (ushort)(temp << 8);
for (var j = 0; j < 8; j++)
{
crcinit = (ushort)((crcinit & 0x8000) > 0 ? (crcinit << 1) ^ crcpoly : crcinit << 1);
}
}
if (refout)
{
char[] arr = Convert.ToString(crcinit, 2).PadLeft(16, '0').ToCharArray();
Array.Reverse(arr);
crcinit = Convert.ToUInt16(new string(arr), 2);
}
crcinit ^= crcxorout;
var hi = (byte)((crcinit & 0xFF00) >> 8);
var lo = (byte)(crcinit & 0x00FF);
return(new[] { hi, lo });
}
public void SetCRCMode(CRCMode mode)
{
lock (this)
{
SendCommand(new byte[] { (byte)RNCommands.SetCRCMode, (byte)mode });
}
}
