/// <summary>
/// Constructor
/// </summary>
/// <param name="portName">Serial port name</param>
public PN532CommunicationHSU(string portName)
{
this.length = 0;
this.isFirstStartCode = false;
this.isWaitingAck = false;
this.frame = new ArrayList();
this.inputBuffer = new ArrayList();
this.queueFrame = new Queue();
this.state = HsuParserState.Preamble;
this.received = new AutoResetEvent(false);
// create and open serial port
this.port = new SerialPort(portName, HSU_BAUD_RATE, HSU_PARITY, HSU_DATA_BITS, HSU_STOP_BITS);
this.port.DataReceived += port_DataReceived;
this.port.Open();
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="portName">Serial port name</param>
public PN532CommunicationHSU(string portName)
{
this.length = 0;
this.isFirstStartCode = false;
this.isWaitingAck = false;
this.frame = new ArrayList();
this.inputBuffer = new ArrayList();
this.queueFrame = new Queue();
this.state = HsuParserState.Preamble;
this.received = new AutoResetEvent(false);
// create and open serial port
this.port = new SerialPort(portName, HSU_BAUD_RATE, HSU_PARITY, HSU_DATA_BITS, HSU_STOP_BITS);
this.port.DataReceived += port_DataReceived;
this.port.Open();
}
/// <summary>
/// Constructor
/// </summary>
private Pn532CommunicationHsu(SerialDevice reader)
{
if (reader == null)
{
throw new ArgumentNullException("serial card reader is not set");
}
_length = 0;
_isFirstStartCode = false;
_isWaitingAck = false;
_frame = new ArrayList();
_inputBuffer = new ArrayList();
_queueFrame = new Queue();
_state = HsuParserState.Preamble;
_received = new AutoResetEvent(false);
_rfidReader = reader;
}
void ExtractFrame()
{
lock (this.inputBuffer)
{
foreach (byte byteRx in this.inputBuffer)
{
switch (this.state)
{
case HsuParserState.Preamble:
// preamble arrived, frame started
if (byteRx == PN532.PN532_PREAMBLE)
{
this.length = 0;
this.isFirstStartCode = false;
this.frame.Clear();
this.frame.Add(byteRx);
this.state = HsuParserState.StartCode;
}
break;
case HsuParserState.StartCode:
// first start code byte not received yet
if (!this.isFirstStartCode)
{
if (byteRx == PN532.PN532_STARTCODE_1)
{
this.frame.Add(byteRx);
this.isFirstStartCode = true;
}
}
// first start code byte already received
else
{
if (byteRx == PN532.PN532_STARTCODE_2)
{
this.frame.Add(byteRx);
this.state = HsuParserState.Length;
}
}
break;
case HsuParserState.Length:
// not waiting ack, the byte is LEN
if (!this.isWaitingAck)
{
// save data length (TFI + PD0...PDn) for counting received data
this.length = byteRx;
this.frame.Add(byteRx);
this.state = HsuParserState.LengthChecksum;
}
// waiting ack, the byte is first of ack/nack code
else
{
this.frame.Add(byteRx);
this.state = HsuParserState.AckCode;
}
break;
case HsuParserState.LengthChecksum:
// arrived LCS
this.frame.Add(byteRx);
this.state = HsuParserState.FrameIdentifierAndData;
break;
case HsuParserState.FrameIdentifierAndData:
this.frame.Add(byteRx);
// count received data bytes (TFI + PD0...PDn)
this.length--;
// all data bytes received
if (this.length == 0)
this.state = HsuParserState.DataChecksum;
break;
case HsuParserState.DataChecksum:
// arrived DCS
this.frame.Add(byteRx);
this.state = HsuParserState.Postamble;
break;
case HsuParserState.Postamble:
// postamble received, frame end
if (byteRx == PN532.PN532_POSTAMBLE)
{
this.frame.Add(byteRx);
this.state = HsuParserState.Preamble;
// enqueue received frame
byte[] frameReceived = new byte[this.frame.Count];
this.frame.CopyTo(frameReceived, 0);
this.queueFrame.Enqueue(frameReceived);
this.received.Set();
}
break;
case HsuParserState.AckCode:
// second byte of ack/nack code
this.frame.Add(byteRx);
this.state = HsuParserState.Postamble;
this.isWaitingAck = false;
break;
default:
break;
}
}
// clear internal buffer
this.inputBuffer.Clear();
}
}
//void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
//{
// lock (inputBuffer)
// {
// // read bytes from serial port and load them in the internal buffer
// byte[] buffer = new byte[port.BytesToRead];
// port.Read(buffer, 0, buffer.Length);
// for (int i = 0; i < buffer.Length; i++)
// inputBuffer.Add(buffer[i]);
// }
// // frame parsing
// ExtractFrame();
//}
void ExtractFrame()
{
lock (_inputBuffer)
{
foreach (byte byteRx in _inputBuffer)
{
switch (_state)
{
case HsuParserState.Preamble:
// preamble arrived, frame started
if (byteRx == PN532.PN532_PREAMBLE)
{
_length = 0;
_isFirstStartCode = false;
_frame.Clear();
_frame.Add(byteRx);
_state = HsuParserState.StartCode;
}
break;
case HsuParserState.StartCode:
// first start code byte not received yet
if (!_isFirstStartCode)
{
if (byteRx == PN532.PN532_STARTCODE_1)
{
_frame.Add(byteRx);
_isFirstStartCode = true;
}
}
// first start code byte already received
else
{
if (byteRx == PN532.PN532_STARTCODE_2)
{
_frame.Add(byteRx);
_state = HsuParserState.Length;
}
}
break;
case HsuParserState.Length:
// not waiting ack, the byte is LEN
if (!_isWaitingAck)
{
// save data length (TFI + PD0...PDn) for counting received data
_length = byteRx;
_frame.Add(byteRx);
_state = HsuParserState.LengthChecksum;
}
// waiting ack, the byte is first of ack/nack code
else
{
_frame.Add(byteRx);
_state = HsuParserState.AckCode;
}
break;
case HsuParserState.LengthChecksum:
// arrived LCS
_frame.Add(byteRx);
_state = HsuParserState.FrameIdentifierAndData;
break;
case HsuParserState.FrameIdentifierAndData:
_frame.Add(byteRx);
// count received data bytes (TFI + PD0...PDn)
_length--;
// all data bytes received
if (_length == 0)
{
_state = HsuParserState.DataChecksum;
}
break;
case HsuParserState.DataChecksum:
// arrived DCS
_frame.Add(byteRx);
_state = HsuParserState.Postamble;
break;
case HsuParserState.Postamble:
// postamble received, frame end
if (byteRx == PN532.PN532_POSTAMBLE)
{
_frame.Add(byteRx);
_state = HsuParserState.Preamble;
// enqueue received frame
byte[] frameReceived = new byte[_frame.Count];
_frame.CopyTo(frameReceived, 0);
_queueFrame.Enqueue(frameReceived);
_received.Set();
}
break;
case HsuParserState.AckCode:
// second byte of ack/nack code
_frame.Add(byteRx);
_state = HsuParserState.Postamble;
_isWaitingAck = false;
break;
default:
break;
}
}
// clear internal buffer
_inputBuffer.Clear();
}
}
