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serial_win32.cpp
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serial_win32.cpp
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/*
* $DateTime: 2015/08/23 13:00:12 $
* $Id: //depot/sircond/serial_win32.cpp#3 $
* $Change: 2154 $
*
* Copyright (C) 2015 Swarga Research (http://www.swarga-research.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pch.h"
#include "serial.h"
//!
//! \file serial_win32.cpp
//! \brief WIN32 implementation of the serial port abstraction class.
//!
namespace sr
{
//!
//! \brief WIN32 version of the serial port abstraction.
//!
//========================================================================
class WindowsSerialPort : public CSerialPort
{
public:
WindowsSerialPort ();
int32_t Open (const string& device);
int32_t SetDataRate (uint32_t baud);
int32_t Send (const uint8_t* data, size_t size, uint32_t timeout);
int32_t Recv (uint8_t* data, size_t maxSize, uint32_t timeout);
void Close ();
private:
~WindowsSerialPort ();
HANDLE hSerial;
OVERLAPPED m_send_ol;
OVERLAPPED m_recv_ol;
};
//========================================================================
int WindowsSerialPort::Open (const string& device)
{
string dev = "\\\\.\\" + device;
hSerial = CreateFile(dev.c_str(), GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
if (hSerial == INVALID_HANDLE_VALUE)
{
DWORD err = GetLastError();
switch (err)
{
case ERROR_FILE_NOT_FOUND:
return ErrorInvalidPort;
break;
case ERROR_ACCESS_DENIED:
return ErrorPortInUse;
break;
case ERROR_PATH_NOT_FOUND:
return ErrorInvalidPort;
break;
default:
return ErrorUnspecified;
break;
}
}
return 0;
}
//========================================================================
int WindowsSerialPort::SetDataRate (unsigned baud)
{
// FLUSH OUT ANY OLD GARBAGE
if (!FlushFileBuffers(hSerial))
{
return ErrorUnspecified;
}
if (!PurgeComm(hSerial, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR))
{
return ErrorUnspecified;
}
// CONFIGURE THE PORT
DCB dcb = {0};
if (!GetCommState(hSerial, &dcb))
{
return ErrorUnspecified;
}
dcb.BaudRate = baud;
dcb.ByteSize = 8;
dcb.StopBits = ONESTOPBIT;
dcb.Parity = NOPARITY;
if (!SetCommState(hSerial, &dcb))
{
if (GetLastError() == ERROR_INVALID_PARAMETER)
{
return ErrorInvalidSettings;
}
return ErrorUnspecified;
}
// SET TIMEOUT AT 50MS
COMMTIMEOUTS timeouts;
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 0;
timeouts.ReadTotalTimeoutMultiplier = 0;
timeouts.WriteTotalTimeoutConstant = 0;
timeouts.WriteTotalTimeoutMultiplier= 0;
if (!SetCommTimeouts(hSerial, &timeouts))
{
return ErrorUnspecified;
}
// FLUSH AGAIN (FOR LUCK ;)
if (!PurgeComm(hSerial, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR))
{
return ErrorUnspecified;
}
return 0;
}
//========================================================================
int32_t WindowsSerialPort::Send (const uint8_t* data,
size_t size,
uint32_t timeout)
{
DWORD bytes = 0U;
DWORD ticks = GetTickCount();
if (!WriteFile(hSerial, data, size, &bytes, &m_send_ol))
{
DWORD err = GetLastError();
if (err != ERROR_IO_PENDING)
{
return ErrorTransmitError;
}
// WAIT FOR THE I/O TO COMPLETE
if (WaitForSingleObject(m_send_ol.hEvent, timeout) == WAIT_TIMEOUT)
{
CancelIo(hSerial);
return ErrorTimeout;
}
GetOverlappedResult(hSerial, &m_send_ol, &bytes, TRUE);
}
DWORD delta = GetTickCount() - ticks;
LogWrite(LEVEL_DEBUG, "TX: %u bytes in %u ms", bytes, delta);
return static_cast<int32_t>(bytes);
}
//========================================================================
int32_t WindowsSerialPort::Recv (uint8_t* data,
size_t maxSize,
uint32_t timeout)
{
DWORD bytes = 0;
DWORD ticks = GetTickCount();
if (!ReadFile(hSerial, data, maxSize, &bytes, &m_recv_ol))
{
DWORD err = GetLastError();
if (err != ERROR_IO_PENDING)
{
return ErrorReceiveError;
}
// WAIT FOR THE I/O TO COMPLETE
if (WaitForSingleObject(m_recv_ol.hEvent, timeout) == WAIT_TIMEOUT)
{
CancelIo(hSerial);
return ErrorTimeout;
}
// GET THE RESULTS OF THE READ OPERATION
GetOverlappedResult(hSerial, &m_recv_ol, &bytes, TRUE);
}
DWORD delta = GetTickCount() - ticks;
LogWrite(LEVEL_DEBUG, "RX: %u bytes in %u ms", bytes, delta);
return static_cast<int32_t>(bytes);
}
//========================================================================
void WindowsSerialPort::Close ()
{
if (hSerial != INVALID_HANDLE_VALUE)
{
CloseHandle(hSerial);
hSerial = INVALID_HANDLE_VALUE;
}
}
//========================================================================
inline WindowsSerialPort::WindowsSerialPort () : hSerial(INVALID_HANDLE_VALUE)
{
// INITIALIZE THE OVERLAPPED I/O DATA
memset(&m_send_ol, '\0', sizeof(m_send_ol));
m_send_ol.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
memset(&m_recv_ol, '\0', sizeof(m_recv_ol));
m_recv_ol.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
}
//========================================================================
WindowsSerialPort::~WindowsSerialPort ()
{
Close();
CloseHandle(m_recv_ol.hEvent);
CloseHandle(m_send_ol.hEvent);
}
//========================================================================
CSerialPort* CSerialPort::New ()
{
return new WindowsSerialPort;
}
//========================================================================
CSerialPort::~CSerialPort ()
{
}
}