private static byte readByte(out uint bytesRead)
{
byte[] c = new byte[256];
Win32Com.ReadFile(HPort, c, 1, out bytesRead, IntPtr.Zero);
return(c[0]);
}
private void ReceiveThread()
{
var buf = new Byte[1];
var sg = new AutoResetEvent(false);
var ov = new OVERLAPPED();
var unmanagedOv = Marshal.AllocHGlobal(Marshal.SizeOf(ov));
ov.Offset = 0; ov.OffsetHigh = 0;
ov.hEvent = sg.Handle;
Marshal.StructureToPtr(ov, unmanagedOv, true);
uint eventMask = 0;
var uMask = Marshal.AllocHGlobal(Marshal.SizeOf(eventMask));
try
{
while (true)
{
if (!Win32Com.SetCommMask(_hPort, Win32Com.EV_RXCHAR | Win32Com.EV_TXEMPTY | Win32Com.EV_CTS | Win32Com.EV_DSR
| Win32Com.EV_BREAK | Win32Com.EV_RLSD | Win32Com.EV_RING | Win32Com.EV_ERR))
{
throw new CommPortException("IO Error [001]");
}
Marshal.WriteInt32(uMask, 0);
if (!Win32Com.WaitCommEvent(_hPort, uMask, unmanagedOv))
{
if (Marshal.GetLastWin32Error() == Win32Com.ERROR_IO_PENDING)
{
sg.WaitOne();
}
else
{
throw new CommPortException("IO Error [002]");
}
}
eventMask = (uint)Marshal.ReadInt32(uMask);
if ((eventMask & Win32Com.EV_ERR) != 0)
{
UInt32 errs;
if (Win32Com.ClearCommError(_hPort, out errs, IntPtr.Zero))
{
var s = new StringBuilder("UART Error: ", 40);
if ((errs & Win32Com.CE_FRAME) != 0)
{
s = s.Append("Framing,");
}
if ((errs & Win32Com.CE_IOE) != 0)
{
s = s.Append("IO,");
}
if ((errs & Win32Com.CE_OVERRUN) != 0)
{
s = s.Append("Overrun,");
}
if ((errs & Win32Com.CE_RXOVER) != 0)
{
s = s.Append("Receive Cverflow,");
}
if ((errs & Win32Com.CE_RXPARITY) != 0)
{
s = s.Append("Parity,");
}
if ((errs & Win32Com.CE_TXFULL) != 0)
{
s = s.Append("Transmit Overflow,");
}
s.Length = s.Length - 1;
throw new CommPortException(s.ToString());
}
throw new CommPortException("IO Error [003]");
}
if ((eventMask & Win32Com.EV_RXCHAR) != 0)
{
uint gotbytes;
do
{
if (!Win32Com.ReadFile(_hPort, buf, 1, out gotbytes, unmanagedOv))
{
if (Marshal.GetLastWin32Error() == Win32Com.ERROR_IO_PENDING)
{
Win32Com.CancelIo(_hPort);
gotbytes = 0;
}
else
{
throw new CommPortException("IO Error [004]");
}
}
if (gotbytes == 1)
{
OnRxChar(buf[0]);
}
} while (gotbytes > 0);
}
if ((eventMask & Win32Com.EV_TXEMPTY) != 0)
{
OnTxDone();
}
if ((eventMask & Win32Com.EV_BREAK) != 0)
{
OnBreak();
}
uint i = 0;
if ((eventMask & Win32Com.EV_CTS) != 0)
{
i |= Win32Com.MS_CTS_ON;
}
if ((eventMask & Win32Com.EV_DSR) != 0)
{
i |= Win32Com.MS_DSR_ON;
}
if ((eventMask & Win32Com.EV_RLSD) != 0)
{
i |= Win32Com.MS_RLSD_ON;
}
if ((eventMask & Win32Com.EV_RING) != 0)
{
i |= Win32Com.MS_RING_ON;
}
if (i != 0)
{
uint f;
if (!Win32Com.GetCommModemStatus(_hPort, out f))
{
throw new CommPortException("IO Error [005]");
}
OnStatusChange(new ModemStatus(i), new ModemStatus(f));
}
}
}
catch (Exception e)
{
if (uMask != IntPtr.Zero)
{
Marshal.FreeHGlobal(uMask);
}
if (unmanagedOv != IntPtr.Zero)
{
Marshal.FreeHGlobal(unmanagedOv);
}
if (!(e is ThreadAbortException))
{
_rxException = e;
OnRxException(e);
}
}
}
private void ReceiveSendThreadSerial()
{
var buffer = new byte[64];
var restart = false;
var sendMessageBytes = new byte[0];
int sentBytes = 0;
var sendTimeout = new Stopwatch();
var portHandle = IntPtr.Zero;
Thread.Sleep(1000);
_receivedBytes.Clear();
var resetEvent = new AutoResetEvent(false);
var overlapped = new OVERLAPPED();
var ptrOverlapped = Marshal.AllocHGlobal(Marshal.SizeOf(overlapped));
overlapped.Offset = 0;
overlapped.OffsetHigh = 0;
overlapped.hEvent = resetEvent.SafeWaitHandle.DangerousGetHandle();
Marshal.StructureToPtr(overlapped, ptrOverlapped, true);
bool waitingRead = false;
var writeResetEvent = new AutoResetEvent(false);
var writeOverlapped = new OVERLAPPED();
var ptrWriteOverlapped = Marshal.AllocHGlobal(Marshal.SizeOf(writeOverlapped));
writeOverlapped.Offset = 0;
writeOverlapped.OffsetHigh = 0;
writeOverlapped.hEvent = writeResetEvent.SafeWaitHandle.DangerousGetHandle();;
Marshal.StructureToPtr(writeOverlapped, ptrWriteOverlapped, true);
bool waitingWrite = false;
while (!_receiveSendThreadStopped)
{
try
{
if (portHandle == IntPtr.Zero)
{
int portnumber = Int32.Parse(_comPort.Replace("COM", String.Empty));
string comPort = _comPort;
if (portnumber > 9)
{
comPort = String.Format("\\\\.\\{0}", _comPort);
}
portHandle = Win32Com.CreateFile(comPort, Win32Com.GENERIC_READ | Win32Com.GENERIC_WRITE, 0, IntPtr.Zero,
Win32Com.OPEN_EXISTING, Win32Com.FILE_FLAG_OVERLAPPED, IntPtr.Zero);
if (portHandle == (IntPtr)Win32Com.INVALID_HANDLE_VALUE)
{
if (Marshal.GetLastWin32Error() == Win32Com.ERROR_ACCESS_DENIED)
{
throw new Exception(String.Format("Access denied for port {0}", _comPort));
}
else
{
throw new Exception(String.Format("Failed to open port {0}", _comPort));
}
}
COMMTIMEOUTS commTimeouts = new COMMTIMEOUTS
{
ReadIntervalTimeout = 5,
ReadTotalTimeoutConstant = 0,
ReadTotalTimeoutMultiplier = 0,
WriteTotalTimeoutConstant = 0,
WriteTotalTimeoutMultiplier = 0
};
DCB dcb = new DCB();
dcb.Init(false, false, false, 0, false, false, false, false, 0);
dcb.BaudRate = _baudRate;
dcb.ByteSize = 8;
dcb.Parity = 0;
dcb.StopBits = 0;
if (!Win32Com.SetupComm(portHandle, 8192, 4096))
{
throw new Exception(String.Format("Failed to set queue settings for port {0}", _comPort));
}
if (!Win32Com.SetCommState(portHandle, ref dcb))
{
throw new Exception(String.Format("Failed to set comm settings for port {0}", _comPort));
}
if (!Win32Com.SetCommTimeouts(portHandle, ref commTimeouts))
{
throw new Exception(String.Format("Failed to set comm timeouts for port {0}", _comPort));
}
if (_rtsCts)
{
if (!Win32Com.EscapeCommFunction(portHandle, Win32Com.CLRRTS))
{
throw new Exception(String.Format("Failed to reset RTS pin{0}", _comPort));
}
}
Thread.Sleep(1000);
}
if (!Win32Com.GetHandleInformation(portHandle, out uint lpdwFlags))
{
throw new Exception(String.Format("Port {0} went offline", _comPort));
}
if (!waitingRead)
{
waitingRead = true;
if (!Win32Com.ReadFile(portHandle, buffer, (uint)buffer.Length, out uint readBytes, ptrOverlapped))
{
if (Marshal.GetLastWin32Error() != Win32Com.ERROR_IO_PENDING)
{
throw new Exception(String.Format("Failed to read port {0}", _comPort));
}
}
}
else
{
if (resetEvent.WaitOne(10))
{
waitingRead = false;
if (!Win32Com.GetOverlappedResult(portHandle, ptrOverlapped, out uint readBytes, false))
{
throw new Exception(String.Format("Failed to read port {0}", _comPort));
}
for (int i = 0; i < readBytes; i++)
{
_receivedBytes.Add(buffer[i]);
}
}
}
if (_sendMessageQueue.Count > 0 && sendMessageBytes.Length == 0)
{
lock (_syncobject)
sendMessageBytes = _sendMessageQueue.Dequeue();
sentBytes = 0;
}
if (sendMessageBytes.Length > 0)
{
if (_rtsCts)
{
if (!Win32Com.EscapeCommFunction(portHandle, Win32Com.SETRTS))
{
lock (_syncobject)
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to set RTS pin{0}", _comPort))));
}
}
uint lpmodemstat = 0;
if (_rtsCts)
{
if (!Win32Com.GetCommModemStatus(portHandle, out lpmodemstat))
{
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to get RTS pin{0}", _comPort))));
}
}
if ((lpmodemstat & Win32Com.MS_CTS_ON) > 0 || !_rtsCts)
{
if (!waitingWrite)
{
waitingWrite = true;
sendTimeout.Restart();
if (!Win32Com.WriteFile(portHandle, sendMessageBytes, (uint)sendMessageBytes.Length, out uint sent, ptrWriteOverlapped))
{
if (Marshal.GetLastWin32Error() != Win32Com.ERROR_IO_PENDING)
{
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to write to port {0}", _comPort))));
}
}
}
else
{
if (writeResetEvent.WaitOne(0))
{
if (!Win32Com.GetOverlappedResult(portHandle, ptrWriteOverlapped, out uint sent, false))
{
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to write to port {0}", _comPort))));
}
sentBytes += (int)sent;
}
}
if (sentBytes == sendMessageBytes.Length || sendTimeout.ElapsedMilliseconds > 200)
{
if (sendTimeout.ElapsedMilliseconds > 100)
{
lock (_syncobject)
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to write all bytes to port {0}", _comPort))));
}
if (_rtsCts)
{
if (!Win32Com.EscapeCommFunction(portHandle, Win32Com.CLRRTS))
{
lock (_syncobject)
_sendExceptionQueue.Enqueue(new SBPSendExceptionEventArgs(new Exception(String.Format("Failed to reset RTS pin{0}", _comPort))));
}
}
sendMessageBytes = new byte[0];
waitingWrite = false;
}
}
}
ProcessReading(restart);
restart = false;
}
catch (Exception e)
{
_receivedBytes.Clear();
Win32Com.CancelIo(portHandle);
Win32Com.CloseHandle(portHandle);
portHandle = IntPtr.Zero;
restart = true;
lock (_syncobject)
_readExceptionQueue.Enqueue(new SBPReadExceptionEventArgs(e));
Thread.Sleep(5000);
}
}
Win32Com.CancelIo(portHandle);
Win32Com.CloseHandle(portHandle);
Marshal.FreeHGlobal(ptrOverlapped);
Marshal.FreeHGlobal(ptrWriteOverlapped);
}