diff options
Diffstat (limited to 'wpd/WpdBasicHardwareDriver/RS232Connection.cpp')
| -rw-r--r-- | wpd/WpdBasicHardwareDriver/RS232Connection.cpp | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/wpd/WpdBasicHardwareDriver/RS232Connection.cpp b/wpd/WpdBasicHardwareDriver/RS232Connection.cpp new file mode 100644 index 00000000..bd456f54 --- /dev/null +++ b/wpd/WpdBasicHardwareDriver/RS232Connection.cpp @@ -0,0 +1,316 @@ +#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. + // + + COMMTIMEOUTS 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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