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#include "stdafx.h"
#include "RS232Connection.tmh"
/*-----------------------------------------------------------------------------
FUNCTION: RS232Connection()
PURPOSE: Constructor. Initializes TTY structure
COMMENTS: This structure is a collection of TTY attributes
used by all parts of this program
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
2/14/96 AllenD Removed npTTYInfo
12/06/06 DonnMo Changed return value type
12/06/06 DonnMo Replaced macro calls with member-variable settings
12/06/06 DonnMo Removed initialization of font-related variables
-----------------------------------------------------------------------------*/
RS232Connection::RS232Connection()
{
//
// initialize generial TTY info
//
m_hCommPort = NULL;
m_fConnected = FALSE;
m_fLocalEcho = FALSE;
m_bPort = 1;
m_dwBaudRate = CBR_9600;
m_bByteSize = 8;
m_bParity = NOPARITY;
m_bStopBits = ONESTOPBIT;
m_fAutowrap = TRUE;
m_fNewLine = FALSE;
m_fDisplayErrors = TRUE;
//
// timeouts
//
//
// TimeoutsDefault
// We need ReadIntervalTimeout here to cause the read operations
// that we do to actually timeout and become overlapped.
// Specifying 1 here causes ReadFile to return very quickly
// so that our reader thread will continue execution.
//
m_TimeoutsDefault = { 25, 0, 0, 0, 0 };
m_timeoutsnew = m_TimeoutsDefault;
//
// read state and status events
//
m_dwReceiveState = RECEIVE_TTY;
m_dwEventFlags = EVENTFLAGS_DEFAULT;
m_chFlag = FLAGCHAR_DEFAULT;
//
// Flow Control Settings
//
m_fDtrControl = DTR_CONTROL_ENABLE;
m_fRtsControl = RTS_CONTROL_ENABLE;
m_chXON = ASCII_XON;
m_chXOFF = ASCII_XOFF;
m_wXONLimit = 0;
m_wXOFFLimit = 0;
m_fCTSOutFlow = FALSE;
m_fDSROutFlow = FALSE;
m_fDSRInFlow = FALSE;
m_fXonXoffOutFlow = FALSE;
m_fXonXoffInFlow = FALSE;
m_fTXafterXoffSent = FALSE;
m_fNoReading = FALSE;
m_fNoWriting = FALSE;
m_fNoEvents = FALSE;
m_fNoStatus = FALSE;
m_fDisplayTimeouts = FALSE;
}
/*-----------------------------------------------------------------------------
FUNCTION: SetPortState( void )
PURPOSE: Sets port state based on settings from the user
COMMENTS: Sets up DCB structure and calls SetCommState.
Sets up new timeouts by calling SetCommTimeouts.
HISTORY: Date: Author: Comment:
1/9/96 AllenD Wrote it
12/06/06 DonnMo Replaced calls to ErrorReporter() with CHECK_HR()
-----------------------------------------------------------------------------*/
HRESULT RS232Connection::SetPortState()
{
HRESULT hr = S_OK;
DCB dcb = {0};
DWORD dwLastError = 0;
dcb.DCBlength = sizeof(dcb);
//
// get current DCB settings
//
if (!GetCommState(m_hCommPort, &dcb))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "GetCommState() failed within SetPortState().");
return hr;
}
//
// update DCB rate, byte size, parity, and stop bits size
//
dcb.BaudRate = m_dwBaudRate;
dcb.ByteSize = m_bByteSize;
dcb.Parity = m_bParity;
dcb.StopBits = m_bStopBits;
//
// update event flags
//
if (m_dwEventFlags & EV_RXFLAG)
{
dcb.EvtChar = m_chFlag;
}
else
{
dcb.EvtChar = '\0';
}
dcb.EofChar = '\n';
//
// update flow control settings
//
dcb.fDtrControl = m_fDtrControl;
dcb.fRtsControl = m_fRtsControl;
dcb.fOutxCtsFlow = m_fCTSOutFlow;
dcb.fOutxDsrFlow = m_fDSROutFlow;
dcb.fDsrSensitivity = m_fDSRInFlow;
dcb.fOutX = m_fXonXoffOutFlow;
dcb.fInX = m_fXonXoffInFlow;
dcb.fTXContinueOnXoff = m_fTXafterXoffSent;
dcb.XonChar = m_chXON;
dcb.XoffChar = m_chXOFF;
dcb.XonLim = m_wXONLimit;
dcb.XoffLim = m_wXOFFLimit;
//
// DCB settings not in the user's control
//
dcb.fParity = TRUE;
//
// set new state
//
if (!SetCommState(m_hCommPort, &dcb))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "SetCommState() failed within SetPortState() when setting the new state.");
return hr;
}
//
// set new timeouts
//
if (!SetCommTimeouts(m_hCommPort, &m_timeoutsnew))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "SetCommTimeouts() failed within SetPortState() when setting the new timeouts.");
return hr;
}
return hr;
}
/*-----------------------------------------------------------------------------
FUNCTION: Connect( void )
PURPOSE: Setup Communication Port with our settings
RETURN:
S_OK and handle of com port if successful
-----------------------------------------------------------------------------*/
HRESULT RS232Connection::Connect(_In_ LPCWSTR wszPortName, _Out_ HANDLE *phCommPort)
{
HRESULT hr = S_OK;
DWORD dwLastError = 0;
if (phCommPort == NULL)
{
hr = E_POINTER;
CHECK_HR(hr, "A NULL phCommPort parameter was received");
return hr;
}
*phCommPort = NULL;
//
// retrieve a handle for the com port
// and configure the port for asynchronous
// communications.
//
m_hCommPort = CreateFileW(wszPortName,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
0);
if (m_hCommPort == NULL)
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "CreateFileW() failed in RS232Connection::Connect");
return hr;
}
//
// Save original comm timeouts and set new ones
//
if (!GetCommTimeouts( m_hCommPort, &(m_timeoutsorig)))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "GetCommTimeouts() failed within RS232Connection::Connect");
return hr;
}
//
// Set port state
//
hr = SetPortState();
if (FAILED(hr))
{
CHECK_HR(hr, "SetPortState() failed within RS232Connection::Connect");
return hr;
}
//
// set comm buffer sizes
//
if (!SetupComm(m_hCommPort, MAX_READ_BUFFER, MAX_WRITE_BUFFER))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "SetupComm(SETDTR) failed within RS232Connection::Connect");
return hr;
}
//
// raise DTR
//
if (!EscapeCommFunction(m_hCommPort, SETDTR))
{
dwLastError = GetLastError();
hr = HRESULT_FROM_WIN32(dwLastError);
CHECK_HR(hr, "EscapeCommFunction() failed within RS232Connection::Connect");
return hr;
}
//
// set overall connect flag
//
m_fConnected = TRUE;
//
// set the return value
//
*phCommPort = m_hCommPort;
if (SUCCEEDED(hr))
{
TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_FLAG_DEVICE, "%!FUNC! handle: %p", m_hCommPort);
}
return hr;
}
/*-----------------------------------------------------------------------------
FUNCTION: Disconnect( void )
PURPOSE: Tears down the Communication Port
RETURN: nothing
-----------------------------------------------------------------------------*/
void RS232Connection::Disconnect()
{
if (m_hCommPort != NULL)
{
TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_FLAG_DEVICE, "%!FUNC! handle: %p", m_hCommPort);
CloseHandle(m_hCommPort);
m_hCommPort = NULL;
}
}
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