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ParallelPort.cpp
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ParallelPort.cpp
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/// \file
/// \brief Implementation of the Linux parallel port class
/// \author Yi Yao (http://yyao.ca/)
///
/// $LastChangedDate: 2009-11-27 23:18:55 -0500 (Fri, 27 Nov 2009) $
///
/// This library helps you interface and control the parallel port of your
/// computer.
///
/// Add the ParallelPort.h and ParallelPort.cpp file to your project to use this
/// library.
///
/// This library is distributed under the zlib license:
/// \verbatim
/// Copyright (C) 2000-2009 Yi Yao
///
/// This software is provided 'as-is', without any express or implied
/// warranty. In no event will the authors be held liable for any damages
/// arising from the use of this software.
///
/// Permission is granted to anyone to use this software for any purpose,
/// including commercial applications, and to alter it and redistribute it
/// freely, subject to the following restrictions:
///
/// 1. The origin of this software must not be misrepresented; you must not
/// claim that you wrote the original software. If you use this software
/// in a product, an acknowledgment in the product documentation would be
/// appreciated but is not required.
/// 2. Altered source versions must be plainly marked as such, and must not be
/// misrepresented as being the original software.
/// 3. This notice may not be removed or altered from any source distribution.
/// \endverbatim
//You can compile documentation for this file using Doxygen:
//http://www.stack.nl/~dimitri/doxygen/
#include "ParallelPort.h"
ParallelPort::ParallelPort() {
mPortName = "";
mPortFD = 0;
mPortOpened = false;
mDataOut = false;
};
ParallelPort::~ParallelPort() {
if (mPortOpened) {
Close();
};
};
void ParallelPort::Open(const std::string& PortName) volatile throw(ParallelPort_errors) {
int PortDataDir;
//Don't open port if it is already opened
if (mPortOpened) {
throw ParallelPort_errors(Opened);
};
//Open device (e.g. /dev/parport0)
mPortFD = open(PortName.c_str(), O_RDWR);
if (mPortFD < 0) {
mPortFD = 0;
throw ParallelPort_errors(Opening);
};
//Claim control over parallel port to deny other processes form access
if (ioctl(mPortFD, PPCLAIM) < 0) {
close(mPortFD);
mPortFD = 0;
throw ParallelPort_errors(Perm);
};
//Set member variables
const_cast<std::string&>(mPortName) = PortName;
mPortOpened = true;
//Save existing R/W registers so that we can restore them later
mPortSavedRegs[0] = Data();
mPortSavedRegs[1] = Ctrl();
//Set data register in known configuration
PortDataDir = 0;
ioctl(mPortFD, PPDATADIR, &PortDataDir);
mDataOut = true;
};
void ParallelPort::Close(void) volatile throw(ParallelPort_errors) {
//Don't close port if its not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
//Restore R/W registers to what they were before we came along
Data(const_cast<unsigned char&>(mPortSavedRegs[0]));
Ctrl(const_cast<unsigned char&>(mPortSavedRegs[1]));
//Release exlusive use of parallel port
if (ioctl(mPortFD, PPRELEASE) < 0) {
throw ParallelPort_errors(Perm);
};
//Close parallel port device (file)
if (close(mPortFD) < 0) {
throw ParallelPort_errors(Closing);
};
//Set member variables to failsafe values
const_cast<std::string&>(mPortName) = "";
mPortFD = 0;
mPortOpened = false;
mDataOut = false;
};
bool ParallelPort::IsOpened(void) volatile {
return mPortOpened;
};
bool ParallelPort::IsClosed(void) volatile {
return !mPortOpened;
};
const std::string& ParallelPort::PortName(void) volatile {
//Don't close port if its not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
return const_cast<std::string&>(mPortName);
};
const unsigned char ParallelPort::Data(void) volatile throw(ParallelPort_errors) {
char c;
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (ioctl(mPortFD, PPRDATA, &c)) {
throw ParallelPort_errors(Read);
};
return c;
};
void ParallelPort::Data(const unsigned char& c) volatile throw(ParallelPort_errors) {
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (ioctl(mPortFD, PPWDATA, &c)) {
throw ParallelPort_errors(Write);
};
};
bool ParallelPort::DataOut(void) volatile throw(ParallelPort_errors) {
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
return mDataOut;
};
void ParallelPort::DataOut(const bool Out) volatile throw(ParallelPort_errors) {
int PortDataDir;
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (Out) {
PortDataDir = 0;
} else {
PortDataDir = 1;
};
if (ioctl(mPortFD, PPDATADIR, &PortDataDir) < 0) {
throw ParallelPort_errors(Perm);
};
mDataOut = Out;
};
const unsigned char ParallelPort::Stat(void) volatile throw(ParallelPort_errors) {
char c;
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (ioctl(mPortFD, PPRSTATUS, &c)) {
throw ParallelPort_errors(Read);
};
return c;
};
const unsigned char ParallelPort::Ctrl(void) volatile throw(ParallelPort_errors) {
char c;
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (ioctl(mPortFD, PPRCONTROL, &c)) {
throw ParallelPort_errors(Read);
};
return c;
};
void ParallelPort::Ctrl(const unsigned char& c) volatile throw(ParallelPort_errors) {
//Don't do anything if port is not opened
if (!mPortOpened) {
throw ParallelPort_errors(Closed);
};
if (ioctl(mPortFD, PPWCONTROL, &c)) {
throw ParallelPort_errors(Write);
};
};