vpParallelPort.cpp

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 by Inria. All rights reserved.
 *
 * This software is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Parallel port management.
 *
 * Authors:
 * Fabien Spindler
 *
 *****************************************************************************/


#include <visp3/core/vpConfig.h>

#ifdef VISP_HAVE_PARPORT

#  include <sys/types.h>
#  include <sys/stat.h>
#  include <fcntl.h>
#  include <sys/ioctl.h>
#  include <unistd.h>

#  include <visp3/io/vpParallelPort.h>

static unsigned char vpParallelPortData;

vpParallelPort::vpParallelPort() : fd(0), device()
{
  sprintf(device, "/dev/parport0");

  this->open();

  unsigned char data = 0;
  this->sendData(data);
}

vpParallelPort::~vpParallelPort()
{
  this->close();
}

void vpParallelPort::open()
{
  fd = ::open("/dev/parport0", O_WRONLY);
  if (fd < 0) {
    printf("Can't open /dev/parport0\n");
    printf("Check if you have write access to /dev/parport0\n");
    perror("Open parallel port");
    throw(vpParallelPortException(vpParallelPortException::opening,
                  "Can't open /dev/parport0")) ;
  }

  int i;

  ioctl(fd, PPCLAIM);
  i = PARPORT_MODE_COMPAT;
  ioctl(fd, PPSETMODE, & i);
  i = IEEE1284_MODE_COMPAT;
  ioctl(fd, PPNEGOT, & i);
}

void vpParallelPort::sendData(unsigned char &data)
{
  ioctl(fd, PPWDATA, & data);

  // Memorise the last sended data to the static variable
  vpParallelPortData = data;
}

unsigned char vpParallelPort::getData()
{
  return vpParallelPortData;
}

void vpParallelPort::close()
{
  ioctl(fd, PPRELEASE);

  int err;
  err = ::close(fd);

  if (err !=0) {
    printf("Can't close the parallel port\n");
    throw(vpParallelPortException(vpParallelPortException::closing,
                  "Can't close the parallel port")) ;
  }


}

#elif !defined(VISP_BUILD_SHARED_LIBS)
// Work arround to avoid warning: libvisp_core.a(vpParallelPort.cpp.o) has no symbols
void dummy_vpParallelPort() {};
#endif