private SerialPortFixer(string portName)
{
const int dwFlagsAndAttributes = 0x40000000;
const FileAccess dwAccess = FileAccess.Read | FileAccess.Write;
if ((portName == null) || !portName.StartsWith("COM", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("Invalid Serial Port", "portName");
}
SafeFileHandle hFile = GWin32.CreateFile(@"\\.\" + portName, dwAccess, 0, IntPtr.Zero, FileMode.Open, dwFlagsAndAttributes,
IntPtr.Zero);
if (hFile.IsInvalid)
{
WinIoError();
}
try
{
int fileType = GetFileType(hFile);
if ((fileType != 2) && (fileType != 0))
{
throw new ArgumentException("Invalid Serial Port", "portName");
}
m_Handle = hFile;
InitializeDcb();
}
catch
{
hFile.Close();
m_Handle = null;
throw;
}
}
private void SetCommStateNative(ref GWin32.DCB lpDcb)
{
int commErrors = 0;
GWin32.Comstat comStat = new GWin32.Comstat();
for (int i = 0; i < CommStateRetries; i++)
{
if (!GWin32.ClearCommError(m_Handle, ref commErrors, ref comStat))
{
WinIoError();
}
if (GWin32.SetCommState(m_Handle, ref lpDcb))
{
break;
}
if (i == CommStateRetries - 1)
{
WinIoError();
}
}
}
public void Open(string comPortName = "COM3", int baudRate = 128000)
{
if (m_hCommPort != null)
{
return;
}
SerialPort comm = new SerialPort();
comm.BaudRate = baudRate;
m_hCommPort = GWin32.CreateFile(comPortName,
FileAccess.Read | FileAccess.Write, //GENERIC_READ | GENERIC_WRITE,//access ( read and write)
FileShare.None, //0, //(share) 0:cannot share the COM port
IntPtr.Zero, //0, //security (None)
FileMode.Open, //OPEN_EXISTING,// creation : open_existing
0x20000000 | 0x40000000, //FILE_FLAG_OVERLAPPED,// we want overlapped operation
IntPtr.Zero //0// no templates file for COM port...
);
if (m_hCommPort == null || m_hCommPort.IsInvalid)
{
m_hCommPort = null;
int err = Marshal.GetLastWin32Error();
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
if (onErr != null)
{
onErr.OnError("Open com failed " + errorMessage, true);
}
throwWinErr("Open com failed ");
}
const uint EV_RXCHAR = 1, EV_TXEMPTY = 4;
if (!GWin32.SetCommMask(m_hCommPort, EV_RXCHAR | EV_TXEMPTY))
{
if (onErr != null)
{
onErr.OnError("Failed to Set Comm Mask", true);
}
throwWinErr("Failed to Set Comm Mask");
}
GWin32.DCB dcb = new GWin32.DCB();
dcb.DCBLength = (uint)Marshal.SizeOf(dcb);
if (!GWin32.GetCommState(m_hCommPort, ref dcb))
{
if (onErr != null)
{
onErr.OnError("CSerialCommHelper : Failed to Get Comm State", true);
}
throwWinErr("CSerialCommHelper : Failed to Get Comm State");
}
dcb.BaudRate = (uint)comm.BaudRate;
dcb.ByteSize = (byte)comm.DataBits;
dcb.Parity = comm.Parity;
dcb.StopBits = comm.StopBits;
dcb.DsrSensitivity = false;
dcb.DtrControl = GWin32.DtrControl.Enable;
dcb.OutxDsrFlow = false;
dcb.OutxCtsFlow = false;
dcb.InX = false;
dcb.RtsControl = GWin32.RtsControl.Disable;
dcb.Binary = true;
if (!GWin32.SetCommState(m_hCommPort, ref dcb))
{
if (onErr != null)
{
onErr.OnError("CSerialCommHelper : Failed to Get Comm State", true);
}
throwWinErr("CSerialCommHelper : Failed to Set Comm State");
}
GWin32.COMMTIMEOUTS commTimeouts = new GWin32.COMMTIMEOUTS();
commTimeouts.ReadIntervalTimeout = 0; // Never timeout, always wait for data.
commTimeouts.ReadTotalTimeoutMultiplier = 0; // Do not allow big read timeout when big read buffer used
commTimeouts.ReadTotalTimeoutConstant = 0; // Total read timeout (period of read loop)
commTimeouts.WriteTotalTimeoutConstant = 0; // Const part of write timeout
commTimeouts.WriteTotalTimeoutMultiplier = 0; // Variable part of write timeout (per byte)
GWin32.SetCommTimeouts(m_hCommPort, ref commTimeouts);
}
protected void gwait()
{
GWin32.SleepEx(GWin32.INFINITE, true);
}
public void Start(IComApp app)
{
GWin32.PurgeComm(m_hCommPort, 0x0004 | 0x0008);
app.OnStart(this);
if (_thread != null)
{
return;
}
threadStarted = true;
new Thread(() =>
{
bool inWrite = false;
uint writeErr = 0;
uint writeOk = 0;
NativeOverlapped ov = new System.Threading.NativeOverlapped();
while (threadStarted)
{
if (m_hCommPort == null || m_hCommPort.IsInvalid)
{
break;
}
SerWriteInfo wi = null;
lock (_writeQueueLock)
{
if (_writeQueue.Count == 0)
{
Monitor.Wait(_writeQueueLock);
}
while (inWrite)
{
Thread.Sleep(100);
Console.WriteLine("in write wait");
}
wi = _writeQueue[0];
_writeQueue.RemoveAt(0);
}
//if (wi.Done != null) try { wi.Done(0, "no buf"); } catch { };
//continue;
if (wi == null || wi.buf == null || wi.buf.Length == 0)
{
if (wi.Done != null)
{
try { wi.Done(0, "no buf"); } catch { }
}
;
continue;
}
inWrite = true;
ResetOverlapped(ov);
var writeRes = GWin32.WriteFileEx(m_hCommPort, wi.buf, (uint)wi.buf.Length, ref ov, (uint err, uint b, ref NativeOverlapped c) =>
{
writeErr = err;
writeOk = b;
inWrite = false;
});
if (!writeRes)
{
//Console.WriteLine("failed write comm " + getWinErr());
if (wi.Done != null)
{
try { wi.Done(255, "failed write comm " + getWinErr()); } catch { }
}
;
inWrite = false;
}
// IOCompletion routine is only called once this thread is in an alertable wait state.
gwait(); //only with thread
if (writeRes)
{
if (wi.Done != null)
{
try { wi.Done(writeErr, writeErr == 0 ? writeOk.ToString() : "WriteError"); } catch { }
}
}
}
Console.WriteLine("Com Write Queue done");
}).Start();
_thread = new Thread(() =>
{
var tbuf = new byte[2048];
var buf1 = new byte[1];
NativeOverlapped ovo = new System.Threading.NativeOverlapped();
try
{
while (threadStarted)
{
SetTimeout(0); //set always wait
GWin32.SetLastError(0);
ResetOverlapped(ovo);
GWin32.ReadFileEx(m_hCommPort, buf1, (uint)buf1.Length, ref ovo, (uint err, uint len, ref NativeOverlapped ovoo) =>
{
if (err != 0)
{
Console.WriteLine("read got err " + err);
}
else
{
SetTimeout();
uint numRead;
NativeOverlapped ov = new System.Threading.NativeOverlapped();
ov.EventHandle = GWin32.CreateEvent(IntPtr.Zero, true, false, null);
if (!GWin32.ReadFile(m_hCommPort, tbuf, (uint)tbuf.Length, out numRead, ref ov))
{
if (GWin32.GetLastError() == 997) //IO Pending
{
GWin32.WaitForSingleObject(ov.EventHandle, GWin32.INFINITE);
}
else
{
Console.WriteLine("read got err " + getWinErr());
}
GWin32.GetOverlappedResult(m_hCommPort, ref ov, out numRead, true);
}
GWin32.CloseHandle(ov.EventHandle);
ov.EventHandle = IntPtr.Zero;
//Console.WriteLine("got data " + numRead);
var buf = new byte[1 + numRead];
buf[0] = buf1[0];
if (numRead > 0)
{
Array.Copy(tbuf, 0, buf, 1, numRead);
app.OnData(buf);
}
//Console.WriteLine(BitConverter.ToString(buf));
}
});
var le = GWin32.GetLastError();
if (le != 0)
{
_thread = null;
Console.WriteLine("Read Error " + le);
break;
}
gwait();
}
} catch (InvalidOperationException iv)
{
_thread = null;
threadStarted = false;
if (onErr != null)
{
onErr.OnError("InvalidOperationException " + iv.Message, true);
return;
}
Console.WriteLine("InvalidOperationException " + iv.Message);
}
Close();
onErr.OnError("thread done", true);
Console.WriteLine("thread done");
});
_thread.Start();
}
protected void SetTimeout(uint tm = GWin32.INFINITE)
{
GWin32.COMMTIMEOUTS commTimeouts = new GWin32.COMMTIMEOUTS();
commTimeouts.ReadIntervalTimeout = tm;
GWin32.SetCommTimeouts(m_hCommPort, ref commTimeouts);
}
