/// <summary>
/// Sends command to the LCD. CRC is automatically appended!
/// </summary>
/// <param name="Command">The Command to Send</param>
/// <param name="Data">Any data that should also be sent.</param>
public void SendCommand(Commands Command, byte[] Data)
{
List <byte> _sendList = new List <byte>();
//Add the Command Byte
_sendList.Add(Convert.ToByte(Command));
//Add the Data Length
_sendList.Add(Convert.ToByte(Data.Length));
//Add the byte array
_sendList.AddRange(Data);
//Append the CRC
CRC.CalculateCRC(ref _sendList);
//Register Packet Event if we sent one!
//Write the command out
outputQueue.Add(_sendList.ToArray());
}
private void processIncomingQueue()
{
bool checkAgain = false;
lock (_incomingQueueLock)
{
if (_incomingBytes.Count < 4)
{
return;
}
byte command = _incomingBytes.Peek();
int maskedCommand = command & 0x3F;
if (maskedCommand < 0 || maskedCommand > 35)
{
// Invalid packet
_incomingBytes.Dequeue();
checkAgain = true;
}
else
{
byte packetLength = _incomingBytes.ElementAt(1);
int totalLength = packetLength + 4;
if (packetLength > 22)
{
// Invalid packet
_incomingBytes.Dequeue();
checkAgain = true;
}
else if (_incomingBytes.Count >= totalLength)
{
// We have enough data for a full packet
// Let's process it now.
//Create a new packet
CFAPacket _Packet = new CFAPacket()
{
Command = command,
DataLength = packetLength,
Data = new byte[packetLength]
};
//Read in all data packets
for (int i = 0; i < _Packet.DataLength; i++)
{
_Packet.Data[i] = _incomingBytes.ElementAt(i + 2);
}
//Read the CRC
byte[] _crcByte = new byte[2];
_crcByte[0] = _incomingBytes.ElementAt(totalLength - 2);
_crcByte[1] = _incomingBytes.ElementAt(totalLength - 1);
_Packet.CRC = BitConverter.ToUInt16(_crcByte, 0);
List <byte> _tempBytes = new byte[] { command, packetLength }.Concat(_Packet.Data).ToList();
CRC.CalculateCRC(ref _tempBytes);
if (_crcByte[0] == _tempBytes.ElementAt(_tempBytes.Count - 2) &&
_crcByte[1] == _tempBytes.Last())
{
for (int i = 0; i < totalLength; i++)
{
_incomingBytes.Dequeue();
}
this.parseData(_Packet);
}
else
{
_incomingBytes.Dequeue();
}
// Check for additional packets
checkAgain = true;
}
}
}
if (checkAgain)
{
processIncomingQueue();
}
}
