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/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* The Initial Developer of this code is David Baum.
* Portions created by David Baum are Copyright (C) 1998 David Baum.
* All Rights Reserved.
*/
#include <windows.h>
#include "PSerial.h"
#define kDefaultSpeed 9600
#define kInputBufferSize 16384
#define kOutputBufferSize 16384
class PSerial_win : public PSerial
{
public:
virtual bool Open(const char *name);
virtual void Close();
virtual long Read(void *ptr, long count);
virtual long Write(const void *ptr, long count);
virtual void FlushWrite();
virtual bool SetTimeout(long timeout_ms);
virtual bool SetSpeed(int speed, int opts = 0);
virtual bool SetDTR(bool assert);
virtual bool SetRTS(bool assert);
private:
HANDLE fFile;
};
PSerial * PSerial::NewSerial()
{
return new PSerial_win;
}
const char *PSerial::GetDefaultName()
{
return "\\\\.\\COM1";
}
bool PSerial_win::Open(const char *name)
{
if (fOpen) return false;
fFile = CreateFile(name,GENERIC_READ | GENERIC_WRITE,
0, 0, OPEN_EXISTING, 0, 0);
if (fFile == INVALID_HANDLE_VALUE) return false;
// SetupComm(fFile, kInputBufferSize, kOutputBufferSize);
if (!SetSpeed(kDefaultSpeed)) return false;
SetBlocking(true);
fOpen = true;
return true;
}
bool PSerial_win::SetSpeed(int speed, int opts)
{
DCB dcb;
dcb.DCBlength = sizeof(DCB); // sizeof(DCB)
if (!GetCommState(fFile, &dcb)) return false;
dcb.BaudRate = speed;
dcb.fBinary = 1;
dcb.fOutxCtsFlow = 0;
dcb.fOutxDsrFlow = 0;
dcb.fDtrControl = DTR_CONTROL_ENABLE; // DTR flow control type
dcb.fDsrSensitivity = 0; // DSR sensitivity
dcb.fTXContinueOnXoff = 0; // XOFF continues Tx
dcb.fOutX = 0; // XON/XOFF out flow control
dcb.fInX = 0; // XON/XOFF in flow control
dcb.fErrorChar = 0; // enable error replacement
dcb.fNull = 0; // enable null stripping
dcb.fRtsControl = 0; // RTS flow control
dcb.fAbortOnError = 0; // abort reads/writes on error
dcb.XonLim = 100;
dcb.XoffLim = 100;
dcb.ByteSize = 8 - (opts & kPSerial_DataMask); // number of bits/byte, 4-8
dcb.Parity = (opts & kPSerial_ParityMask) >> kPSerial_ParityShift; // 0-4=no,odd,even,mark,space
dcb.StopBits = ((opts & kPSerial_StopMask) >> kPSerial_StopShift); // 0,1,2 = 1, 1.5, 2
dcb.XonChar = 1;
dcb.XoffChar = 2;
dcb.ErrorChar = 0;
dcb.EofChar = 0;
dcb.EvtChar = 0;
return SetCommState(fFile, &dcb);
}
bool PSerial_win::SetTimeout(long timeout_ms)
{
COMMTIMEOUTS timeouts;
timeouts.ReadIntervalTimeout = 0;
timeouts.ReadTotalTimeoutMultiplier = 0;
timeouts.ReadTotalTimeoutConstant = 0;
timeouts.WriteTotalTimeoutMultiplier = 0;
timeouts.WriteTotalTimeoutConstant = 0;
switch(timeout_ms)
{
case kPStream_NeverTimeout:
break;
case 0:
timeouts.ReadIntervalTimeout = MAXDWORD;
break;
default:
timeouts.ReadTotalTimeoutConstant = timeout_ms;
break;
}
SetCommTimeouts(fFile, &timeouts);
return true;
}
void PSerial_win::Close()
{
if (!fOpen) return;
CloseHandle(fFile);
fOpen = false;
}
long PSerial_win::Write(const void *ptr, long count)
{
DWORD actual;
if (!WriteFile(fFile, ptr, (unsigned long)count, &actual, (struct _OVERLAPPED *)NULL))
return -1;
return actual;
}
long PSerial_win::Read(void *ptr, long count)
{
DWORD actual;
if (!ReadFile(fFile, ptr, count, &actual, (struct _OVERLAPPED *)NULL))
{
DWORD lstError = GetLastError();
DWORD Errors;
COMSTAT cstat;
ClearCommError( fFile, &Errors, &cstat );
return 0;
}
return actual;
}
bool PSerial_win::SetDTR(bool assert)
{
return EscapeCommFunction(fFile, assert ? SETDTR : CLRDTR);
}
bool PSerial_win::SetRTS(bool assert)
{
return EscapeCommFunction(fFile, assert ? SETRTS : CLRRTS);
}
void PSerial_win::FlushWrite()
{
FlushFileBuffers(fFile);
}
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