public bool Close()
{
CommErrorFlags flags;
if (this.txOverlapped != IntPtr.Zero)
{
LocalFree(this.txOverlapped);
this.txOverlapped = IntPtr.Zero;
}
if (this.rxOverlapped != IntPtr.Zero)
{
LocalFree(this.rxOverlapped);
this.rxOverlapped = IntPtr.Zero;
}
if (this.hPort == IntPtr.Zero)
{
return(false);
}
int num = 0;
Label_0068:
flags = 0;
CommStat stat = new CommStat();
if (!this.m_CommAPI.ClearCommError(this.hPort, ref flags, stat) || (stat.cbOutQue != 0))
{
Thread.Sleep(1);
if (num < 3)
{
num++;
Thread.Sleep(10);
goto Label_0068;
}
}
this.m_CommAPI.PurgeComm(this.hPort, 0);
this.m_CommAPI.CloseHandle(this.hPort);
this.m_CommAPI.SetEvent(this.closeEvent);
this.isOpen = false;
this.hPort = (IntPtr)(-1);
return(true);
}
private static extern int CEClearCommError(IntPtr hFile, ref CommErrorFlags lpErrors, CommStat lpStat);
internal override bool ClearCommError(IntPtr hPort, ref CommErrorFlags flags, CommStat stat)
{
return(Convert.ToBoolean(CEClearCommError(hPort, ref flags, stat)));
}
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new Byte[rxBufferSize];
int bytesread = 0;
AutoResetEvent rxevent = new AutoResetEvent(false);
// specify the set of events to be monitored for the port.
if (CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
// set up the overlapped IO
OVERLAPPED o = new OVERLAPPED();
rxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = rxevent.Handle;
Marshal.StructureToPtr(o, rxOverlapped, true);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
try
{
// let Open() know we're started
threadStarted.Set();
#region >>>> thread loop <<<<
while (hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
// wait for a Comm event
if (!m_CommAPI.WaitCommEvent(hPort, ref eventFlags))
{
int e = Marshal.GetLastWin32Error();
if (e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
rxevent.WaitOne();
Thread.Sleep(0);
continue;
}
if (e == (int)APIErrors.ERROR_INVALID_HANDLE)
{
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the closeEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = m_CommAPI.WaitForSingleObject(closeEvent, 1000);
if (eventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
threadStarted.Reset();
if (isOpen) // this should not be the case...if so, throw an exception for the owner
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
return;
}
}
// WaitCommEvent failed
// 995 means an exit was requested (thread killed)
if (e == 995)
{
return;
}
else
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
}
// Re-specify the set of events to be monitored for the port.
if (CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
// check the event for errors
#region >>>> error checking <<<<
if (((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
{
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
// get the error status
if (!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat))
{
// ClearCommError failed!
string error = String.Format("ClearCommError Failed: {0}", Marshal.GetLastWin32Error());
throw new CommPortException(error);
}
if (((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0)
{
// BREAK can set an error, so make sure the BREAK bit is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else
{
// we have an error. Build a meaningful string and throw an exception
StringBuilder s = new StringBuilder("UART Error: ", 80);
if ((errorFlags & CommErrorFlags.FRAME) != 0)
{
s = s.Append("Framing,");
}
if ((errorFlags & CommErrorFlags.IOE) != 0)
{
s = s.Append("IO,");
}
if ((errorFlags & CommErrorFlags.OVERRUN) != 0)
{
s = s.Append("Overrun,");
}
if ((errorFlags & CommErrorFlags.RXOVER) != 0)
{
s = s.Append("Receive Overflow,");
}
if ((errorFlags & CommErrorFlags.RXPARITY) != 0)
{
s = s.Append("Parity,");
}
if ((errorFlags & CommErrorFlags.TXFULL) != 0)
{
s = s.Append("Transmit Overflow,");
}
// no known bits are set
if (s.Length == 12)
{
s = s.Append("Unknown");
}
// raise an error event
if (OnError != null)
{
OnError(s.ToString());
}
continue;
}
} // if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
#endregion
#region >>>> line status checking <<<<
// check for status changes
uint status = 0;
m_CommAPI.GetCommModemStatus(hPort, ref status);
// check the CTS
if (((uint)eventFlags & (uint)CommEventFlags.CTS) != 0)
{
if (CTSChange != null)
{
CTSChange((status & (uint)CommModemStatusFlags.MS_CTS_ON) != 0);
}
}
// check the DSR
if (((uint)eventFlags & (uint)CommEventFlags.DSR) != 0)
{
if (DSRChange != null)
{
DSRChange((status & (uint)CommModemStatusFlags.MS_DSR_ON) != 0);
}
}
// check for a RING
if (((uint)eventFlags & (uint)CommEventFlags.RING) != 0)
{
if (RingChange != null)
{
RingChange((status & (uint)CommModemStatusFlags.MS_RING_ON) != 0);
}
}
// check for a RLSD
if (((uint)eventFlags & (uint)CommEventFlags.RLSD) != 0)
{
if (RLSDChange != null)
{
RLSDChange((status & (uint)CommModemStatusFlags.MS_RLSD_ON) != 0);
}
}
// check for TXEMPTY
if (((uint)eventFlags & (uint)CommEventFlags.TXEMPTY) != 0)
{
if (TxDone != null)
{
TxDone();
}
}
// check for RXFLAG
if (((uint)eventFlags & (uint)CommEventFlags.RXFLAG) != 0)
{
if (FlagCharReceived != null)
{
FlagCharReceived();
}
}
// check for POWER
if (((uint)eventFlags & (uint)CommEventFlags.POWER) != 0)
{
if (PowerEvent != null)
{
PowerEvent();
}
}
// check for high-water state
if ((eventFlags & CommEventFlags.RX80FULL) != 0)
{
if (HighWater != null)
{
HighWater();
}
}
#endregion
#region >>>> Receive data subsection <<<<
// check for RXCHAR
if ((eventFlags & CommEventFlags.RXCHAR) != 0)
{
do
{
// make sure the port handle is valid
if (hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
bytesread = 0;
break;
}
// data came in, put it in the buffer and set the event
if (!m_CommAPI.ReadFile(hPort, readbuffer, rxBufferSize, ref bytesread, rxOverlapped))
{
string errString = String.Format("ReadFile Failed: {0}", Marshal.GetLastWin32Error());
if (OnError != null)
{
OnError(errString);
}
return;
}
if (bytesread >= 1)
{
// take the mutex
rxBufferBusy.WaitOne();
// put the data into the fifo
// this *may* be a perf problem and needs testing
for (int b = 0; b < bytesread; b++)
{
rxFIFO.Enqueue(readbuffer[b]);
}
// get the FIFO length
int fifoLength = rxFIFO.Count;
// release the mutex
rxBufferBusy.ReleaseMutex();
// fire the DataReceived event every RThreshold bytes
if ((DataReceived != null) && (rthreshold != 0) && (fifoLength >= rthreshold))
{
DataReceived();
}
}
} while (bytesread > 0);
} // if((eventFlags & CommEventFlags.RXCHAR) != 0)
#endregion
} // while(true)
#endregion
} // try
catch (Exception e)
{
if (rxOverlapped != IntPtr.Zero)
{
LocalFree(rxOverlapped);
}
if (OnError != null)
{
OnError(e.Message);
}
return;
}
}
private static extern int WinClearCommError(IntPtr hFile, ref CommErrorFlags lpErrors, CommStat lpStat);
override internal bool ClearCommError(IntPtr hPort, ref CommErrorFlags flags, CommStat stat)
{
return Convert.ToBoolean(WinClearCommError(hPort, ref flags, stat));
}
internal virtual bool ClearCommError(IntPtr hPort, ref CommErrorFlags flags, CommStat stat){return false;}
internal virtual bool ClearCommError(IntPtr hPort, ref CommErrorFlags flags, CommStat stat)
{
return(false);
}
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new Byte[rxBufferSize];
int bytesread = 0;
AutoResetEvent rxevent = new AutoResetEvent(false);
// specify the set of events to be monitored for the port.
if(CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
// set up the overlapped IO
OVERLAPPED o = new OVERLAPPED();
rxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = rxevent.Handle;
Marshal.StructureToPtr(o, rxOverlapped, true);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
try
{
// let Open() know we're started
threadStarted.Set();
#region >>>> thread loop <<<<
while(hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
// wait for a Comm event
if(!m_CommAPI.WaitCommEvent(hPort, ref eventFlags))
{
int e = Marshal.GetLastWin32Error();
if(e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
rxevent.WaitOne();
Thread.Sleep(0);
continue;
}
if(e == (int)APIErrors.ERROR_INVALID_HANDLE)
{
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the closeEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = m_CommAPI.WaitForSingleObject(closeEvent, 1000);
if(eventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
threadStarted.Reset();
if(isOpen) // this should not be the case...if so, throw an exception for the owner
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
return;
}
}
// WaitCommEvent failed
// 995 means an exit was requested (thread killed)
if(e == 995)
{
return;
}
else
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
}
// Re-specify the set of events to be monitored for the port.
if(CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
// check the event for errors
#region >>>> error checking <<<<
if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
{
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
// get the error status
if(!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat))
{
// ClearCommError failed!
string error = String.Format("ClearCommError Failed: {0}", Marshal.GetLastWin32Error());
throw new CommPortException(error);
}
if(((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0)
{
// BREAK can set an error, so make sure the BREAK bit is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else
{
// we have an error. Build a meaningful string and throw an exception
StringBuilder s = new StringBuilder("UART Error: ", 80);
if ((errorFlags & CommErrorFlags.FRAME) != 0)
{ s = s.Append("Framing,"); }
if ((errorFlags & CommErrorFlags.IOE) != 0)
{ s = s.Append("IO,"); }
if ((errorFlags & CommErrorFlags.OVERRUN) != 0)
{ s = s.Append("Overrun,"); }
if ((errorFlags & CommErrorFlags.RXOVER) != 0)
{ s = s.Append("Receive Overflow,"); }
if ((errorFlags & CommErrorFlags.RXPARITY) != 0)
{ s = s.Append("Parity,"); }
if ((errorFlags & CommErrorFlags.TXFULL) != 0)
{ s = s.Append("Transmit Overflow,"); }
// no known bits are set
if(s.Length == 12)
{ s = s.Append("Unknown"); }
// raise an error event
if(OnError != null)
OnError(s.ToString());
continue;
}
} // if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
#endregion
#region >>>> Receive data subsection <<<<
// check for RXCHAR
if((eventFlags & CommEventFlags.RXCHAR) != 0)
{
do
{
// make sure the port handle is valid
if(hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
bytesread = 0;
break;
}
// data came in, put it in the buffer and set the event
if (!m_CommAPI.ReadFile(hPort, readbuffer, rxBufferSize, ref bytesread, rxOverlapped))
{
string errString = String.Format("ReadFile Failed: {0}", Marshal.GetLastWin32Error());
if(OnError != null)
OnError(errString);
return;
}
if (bytesread >= 1)
{
// take the mutex
rxBufferBusy.WaitOne();
// put the data into the fifo
// this *may* be a perf problem and needs testing
for(int b = 0 ; b < bytesread ; b++)
rxFIFO.Enqueue(readbuffer[b]);
// get the FIFO length
int fifoLength = rxFIFO.Count;
// release the mutex
rxBufferBusy.ReleaseMutex();
// fire the DataReceived event every RThreshold bytes
if((DataReceived != null) && (rthreshold != 0) && (fifoLength >= rthreshold))
{
DataReceived();
}
}
} while (bytesread > 0);
} // if((eventFlags & CommEventFlags.RXCHAR) != 0)
#endregion
#region >>>> line status checking <<<<
// check for status changes
uint status = 0;
m_CommAPI.GetCommModemStatus(hPort, ref status);
// check the CTS
if(((uint)eventFlags & (uint)CommEventFlags.CTS) != 0)
{
if(CTSChange != null)
CTSChange((status & (uint)CommModemStatusFlags.MS_CTS_ON) != 0);
}
// check the DSR
if(((uint)eventFlags & (uint)CommEventFlags.DSR) != 0)
{
if(DSRChange != null)
DSRChange((status & (uint)CommModemStatusFlags.MS_DSR_ON) != 0);
}
// check for a RING
if(((uint)eventFlags & (uint)CommEventFlags.RING) != 0)
{
if(RingChange != null)
RingChange((status & (uint)CommModemStatusFlags.MS_RING_ON) != 0);
}
// check for a RLSD
if(((uint)eventFlags & (uint)CommEventFlags.RLSD) != 0)
{
if(RLSDChange != null)
RLSDChange((status & (uint)CommModemStatusFlags.MS_RLSD_ON) != 0);
}
// check for TXEMPTY
if(((uint)eventFlags & (uint)CommEventFlags.TXEMPTY) != 0)
if(TxDone != null) { TxDone(); }
// check for RXFLAG
if(((uint)eventFlags & (uint)CommEventFlags.RXFLAG) != 0)
if(FlagCharReceived != null) { FlagCharReceived(); }
// check for POWER
if(((uint)eventFlags & (uint)CommEventFlags.POWER) != 0)
if(PowerEvent != null) { PowerEvent(); }
// check for high-water state
if((eventFlags & CommEventFlags.RX80FULL) != 0)
if(HighWater != null) { HighWater(); }
#endregion
} // while(true)
#endregion
} // try
catch(Exception e)
{
if(rxOverlapped != IntPtr.Zero)
LocalFree(rxOverlapped);
if(OnError != null)
OnError(e.Message);
return;
}
}
/// <summary>
/// Opens a new serial port connection.
/// </summary>
public void Open() {
if(this.mIsOpen) throw new InvalidOperationException("Comm Port is already open!");
if(CommAPI.FullFramework) {
// set up the overlapped tx IO
OVERLAPPED o = new OVERLAPPED();
this.mTxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = IntPtr.Zero;
Marshal.StructureToPtr(o, this.mTxOverlapped, true);
}
hPort = m_CommAPI.CreateFile(this.mPortName);
if(hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE) {
int e = Marshal.GetLastWin32Error();
if(e == (int)APIErrors.ERROR_ACCESS_DENIED) {
// port is unavailable
throw new ApplicationException("ERROR_ACCESS_DENIED");
}
// ClearCommError failed!
string error = String.Format("CreateFile Failed: {0}", e);
throw new ApplicationException(error);
}
this.mIsOpen = true;
// clear errors
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
if(!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat)) {
throw new ApplicationException("Failed to clear error/read");
}
// set queue sizes
m_CommAPI.SetupComm(hPort, this.mRxBufferSize, this.mTxBufferSize);
// update dcb
this.UpdateSettings();
// store some state values
this.mInBreak = false;
// read/write timeouts
this.UpdateTimeouts();
// start the receive thread
this.mEventThread = new Thread(new ThreadStart(CommEventThread));
this.mEventThread.Priority = ThreadPriority.Normal; //by design
this.mEventThread.Start();
// wait for the thread to actually get spun up
this.mThreadStarted.WaitOne();
}
private void ProcessEvents(object flags){
CommEventFlags eventFlags = (CommEventFlags)flags;
// check the event for errors
#region >>>> error checking <<<<
if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0) {
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
// get the error status
if(!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat)) {
// ClearCommError failed!
string error = String.Format("ClearCommError Failed: {0}", Marshal.GetLastWin32Error());
throw new ApplicationException(error);
}
if(((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0) {
// BREAK can set an error, so make sure the BREAK bit is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else {
// we have an error. Build a meaningful string and throw an exception
if (ErrorReceived != null){
if ((errorFlags & CommErrorFlags.TXFULL) != 0) {
ErrorReceived(this,new SerialErrorReceivedEventArgs(SerialError.TXFull));
}
if ((errorFlags & CommErrorFlags.RXOVER) != 0) {
ErrorReceived(this,new SerialErrorReceivedEventArgs(SerialError.RXOver));
}
if ((errorFlags & CommErrorFlags.OVERRUN) != 0) {
ErrorReceived(this,new SerialErrorReceivedEventArgs(SerialError.Overrun));
}
if ((errorFlags & CommErrorFlags.RXPARITY) != 0) {
ErrorReceived(this,new SerialErrorReceivedEventArgs(SerialError.RXParity));
}
if ((errorFlags & CommErrorFlags.FRAME) != 0) {
ErrorReceived(this,new SerialErrorReceivedEventArgs(SerialError.Frame));
}
}
return;
}
} // if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
#endregion
#region >>>> Receive data subsection <<<<
// check for RXCHAR
if (DataReceived != null){
if((eventFlags & CommEventFlags.RXCHAR) != 0) {
DataReceived(this,new SerialDataReceivedEventArgs(SerialData.Chars));
}
if(((uint)eventFlags & 2) != 0) {
DataReceived(this,new SerialDataReceivedEventArgs(SerialData.Eof));
}
}
#endregion
#region >>>> line status checking <<<<
if(PinChanged != null){
// check the CTS
if(((uint)eventFlags & (uint)CommEventFlags.CTS) != 0) {
PinChanged(this,new SerialPinChangedEventArgs(SerialPinChange.CtsChanged));
}
// check the DSR
if(((uint)eventFlags & (uint)CommEventFlags.DSR) != 0) {
PinChanged(this,new SerialPinChangedEventArgs(SerialPinChange.DsrChanged));
}
// check for a RING
if(((uint)eventFlags & (uint)CommEventFlags.RING) != 0) {
PinChanged(this,new SerialPinChangedEventArgs(SerialPinChange.Ring));
}
// check for a RLSD
if(((uint)eventFlags & (uint)CommEventFlags.RLSD) != 0) {
PinChanged(this,new SerialPinChangedEventArgs(SerialPinChange.CDChanged));
}
// check for a break
if(((uint)eventFlags & (uint)CommEventFlags.BREAK) != 0) {
PinChanged(this,new SerialPinChangedEventArgs(SerialPinChange.Break));
}
}
#endregion
}
private void CommEventThread()
{
byte[] buffer = new byte[this.rxBufferSize];
int cbRead = 0;
new AutoResetEvent(false);
if (CommAPI.FullFramework)
{
this.m_CommAPI.SetCommMask(this.hPort, CommEventFlags.ALLPC);
}
else
{
this.m_CommAPI.SetCommMask(this.hPort, CommEventFlags.ALLCE);
}
this.threadStarted.Set();
StringBuilder builder = new StringBuilder("", 80);
while (this.hPort != ((IntPtr) (-1)))
{
try
{
CommErrorFlags flags = 0;
CommStat stat = new CommStat();
if (!this.m_CommAPI.ClearCommError(this.hPort, ref flags, stat))
{
Thread.Sleep(20);
}
else if (stat.cbInQue == 0)
{
Thread.Sleep(20);
}
else
{
builder.Append("UART Error: ");
if ((flags & CommErrorFlags.FRAME) != 0)
{
builder = builder.Append("Framing,");
}
if ((flags & CommErrorFlags.IOE) != 0)
{
builder = builder.Append("IO,");
}
if ((flags & CommErrorFlags.OVERRUN) != 0)
{
builder = builder.Append("Overrun,");
}
if ((flags & CommErrorFlags.RXOVER) != 0)
{
builder = builder.Append("Receive Overflow,");
}
if ((flags & CommErrorFlags.RXPARITY) != 0)
{
builder = builder.Append("Parity,");
}
if ((flags & CommErrorFlags.TXFULL) != 0)
{
builder = builder.Append("Transmit Overflow,");
}
if ((flags & CommErrorFlags.BREAK) != 0)
{
builder = builder.Append("Break,");
}
if (builder.Length == 12)
{
builder = builder.Append("Unknown");
}
if ((this.OnError != null) && (flags != 0))
{
this.OnError(builder.ToString());
}
if (stat.cbInQue >= this.rxBufferSize)
{
this.m_CommAPI.ReadFile(this.hPort, buffer, this.rxBufferSize, ref cbRead, IntPtr.Zero);
}
else
{
this.m_CommAPI.ReadFile(this.hPort, buffer, (int) stat.cbInQue, ref cbRead, IntPtr.Zero);
}
if (cbRead >= 1)
{
this.rxBufferBusy.WaitOne();
for (int i = 0; i < cbRead; i++)
{
this.rxFIFO.Enqueue(buffer[i]);
}
int count = this.rxFIFO.Count;
this.rxBufferBusy.ReleaseMutex();
if (((this.DataReceived != null) && (this.rthreshold != 0)) && (count >= this.rthreshold))
{
this.DataReceived();
}
}
builder.Remove(0, builder.Length);
Thread.Sleep(1);
}
continue;
}
catch (Exception exception)
{
if (this.rxOverlapped != IntPtr.Zero)
{
LocalFree(this.rxOverlapped);
}
if (this.OnError != null)
{
this.OnError(exception.Message);
}
continue;
}
}
}
public bool Close()
{
CommErrorFlags flags;
if (this.txOverlapped != IntPtr.Zero)
{
LocalFree(this.txOverlapped);
this.txOverlapped = IntPtr.Zero;
}
if (this.rxOverlapped != IntPtr.Zero)
{
LocalFree(this.rxOverlapped);
this.rxOverlapped = IntPtr.Zero;
}
if (this.hPort == IntPtr.Zero)
{
return false;
}
int num = 0;
Label_0068:
flags = 0;
CommStat stat = new CommStat();
if (!this.m_CommAPI.ClearCommError(this.hPort, ref flags, stat) || (stat.cbOutQue != 0))
{
Thread.Sleep(1);
if (num < 3)
{
num++;
Thread.Sleep(10);
goto Label_0068;
}
}
this.m_CommAPI.PurgeComm(this.hPort, 0);
this.m_CommAPI.CloseHandle(this.hPort);
this.m_CommAPI.SetEvent(this.closeEvent);
this.isOpen = false;
this.hPort = (IntPtr) (-1);
return true;
}
private void CommEventThread()
{
byte[] buffer = new byte[this.rxBufferSize];
int cbRead = 0;
new AutoResetEvent(false);
if (CommAPI.FullFramework)
{
this.m_CommAPI.SetCommMask(this.hPort, CommEventFlags.ALLPC);
}
else
{
this.m_CommAPI.SetCommMask(this.hPort, CommEventFlags.ALLCE);
}
this.threadStarted.Set();
StringBuilder builder = new StringBuilder("", 80);
while (this.hPort != ((IntPtr)(-1)))
{
try
{
CommErrorFlags flags = 0;
CommStat stat = new CommStat();
if (!this.m_CommAPI.ClearCommError(this.hPort, ref flags, stat))
{
Thread.Sleep(20);
}
else if (stat.cbInQue == 0)
{
Thread.Sleep(20);
}
else
{
builder.Append("UART Error: ");
if ((flags & CommErrorFlags.FRAME) != 0)
{
builder = builder.Append("Framing,");
}
if ((flags & CommErrorFlags.IOE) != 0)
{
builder = builder.Append("IO,");
}
if ((flags & CommErrorFlags.OVERRUN) != 0)
{
builder = builder.Append("Overrun,");
}
if ((flags & CommErrorFlags.RXOVER) != 0)
{
builder = builder.Append("Receive Overflow,");
}
if ((flags & CommErrorFlags.RXPARITY) != 0)
{
builder = builder.Append("Parity,");
}
if ((flags & CommErrorFlags.TXFULL) != 0)
{
builder = builder.Append("Transmit Overflow,");
}
if ((flags & CommErrorFlags.BREAK) != 0)
{
builder = builder.Append("Break,");
}
if (builder.Length == 12)
{
builder = builder.Append("Unknown");
}
if ((this.OnError != null) && (flags != 0))
{
this.OnError(builder.ToString());
}
if (stat.cbInQue >= this.rxBufferSize)
{
this.m_CommAPI.ReadFile(this.hPort, buffer, this.rxBufferSize, ref cbRead, IntPtr.Zero);
}
else
{
this.m_CommAPI.ReadFile(this.hPort, buffer, (int)stat.cbInQue, ref cbRead, IntPtr.Zero);
}
if (cbRead >= 1)
{
this.rxBufferBusy.WaitOne();
for (int i = 0; i < cbRead; i++)
{
this.rxFIFO.Enqueue(buffer[i]);
}
int count = this.rxFIFO.Count;
this.rxBufferBusy.ReleaseMutex();
if (((this.DataReceived != null) && (this.rthreshold != 0)) && (count >= this.rthreshold))
{
this.DataReceived();
}
}
builder.Remove(0, builder.Length);
Thread.Sleep(1);
}
continue;
}
catch (Exception exception)
{
if (this.rxOverlapped != IntPtr.Zero)
{
LocalFree(this.rxOverlapped);
}
if (this.OnError != null)
{
this.OnError(exception.Message);
}
continue;
}
}
}
