public byte[] BuildCmdPackage(byte[] buf)
{
byte[] pack = new byte[buf.Length + 8];
pack[0] = (byte)'R';
pack[1] = (byte)'E';
pack[2] = (byte)'Q';
pack[3] = (byte)(buf.Length % 0x100);
pack[4] = (byte)(buf.Length / 0x100);
pack[5] = (byte)(pack[3] << 1 + pack[4]);
Array.Copy(buf, 0, pack, 6, buf.Length);
Crc16Ccitt crc = new Crc16Ccitt(Crc16Ccitt.InitialCrcValue.Zeros);
byte[] crcbuf = crc.ComputeChecksumBytes(buf);
Array.Copy(crcbuf, 0, pack, buf.Length + 6, 2);
return pack;
}
public bool ProcessReceivedBuffer(byte[] buff,int length)
{
for (int bufIndex = 0; bufIndex < length; bufIndex++)
{
switch (currCmdProcess)
{
case 0:
switch (currCmdSubProcess)
{
case 0:
if (buff[bufIndex] == 'A')
currCmdSubProcess++;
else
resetProcessStatus();
break;
case 1:
if (buff[bufIndex] == 'S')
currCmdSubProcess++;
else
resetProcessStatus();
break;
case 2:
if (buff[bufIndex] == 'N')
currCmdSubProcess++;
else
resetProcessStatus();
break;
case 3:
packlen_1 = buff[bufIndex];
currCmdSubProcess++;
break;
case 4:
packlen_2 = buff[bufIndex];
currCmdSubProcess++;
break;
case 5:
if (buff[bufIndex] == (byte)(packlen_1 << 1 + packlen_2))
{
packagelen = (ushort)(packlen_1 + packlen_2 * 0x100);
currCmdSubProcess = 0;
currCmdProcess++;
}
else
resetProcessStatus();
break;
}
break;
case 1:
if (currCmdSubProcess == 0)
receivedBuf = new byte[packagelen];
if (currCmdSubProcess < packagelen)
{
receivedBuf[currCmdSubProcess++] = buff[bufIndex];
if (currCmdSubProcess >= packagelen)
{
currCmdProcess++;
currCmdSubProcess = 0;
}
}
else
{
resetProcessStatus();
}
break;
case 2:
if (currCmdSubProcess == 0)
{
crc_1 = buff[bufIndex];
currCmdSubProcess++;
}
else
{
crc_2 = buff[bufIndex];
Crc16Ccitt crc = new Crc16Ccitt(Crc16Ccitt.InitialCrcValue.Zeros);
byte[] bCrc = crc.ComputeChecksumBytes(receivedBuf);
if (bCrc[0] == crc_1 && bCrc[1] == crc_2)
{
ProcessANS();
}
resetProcessStatus();
}
break;
}
}
return false;
}
public void BuildAnsPackage(byte[] buf)
{
byte[] pack = new byte[buf .Length+ 8];
pack[0] = (byte)'A';
pack[1] = (byte)'S';
pack[2] = (byte)'N';
pack[3] = (byte)(buf.Length % 0x100);
pack[4] = (byte)(buf.Length / 0x100);
pack[5] = (byte)(pack[3]<<1+pack[4]);
Array.Copy(buf, 0, pack, 6, buf.Length);
Crc16Ccitt crc = new Crc16Ccitt(Crc16Ccitt.InitialCrcValue.Zeros);
byte[] crcbuf= crc.ComputeChecksumBytes(buf);
Array.Copy(crcbuf, 0, pack, buf.Length + 6, 2);
ResponseBuf = pack;
HaveResponse = true;
}