parallel.cpp

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// PTF - Psychological Test Framework
// http://ptf.sourceforge.net
//
// 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 Library 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 <ptf/environment/parallel.hpp>
#include <ptf/core/timeinterval.hpp>
#include <sys/io.h>
#include <stdexcept>

Parallel::Parallel() {
    // nothing to do here
}

Parallel::~Parallel() {
    // nothing to do here
}

void Parallel::output(short pattern, timespec wait) {
    // i386 code path ----------------------------------------------------------
    #ifdef __i386__
        // get access to the ports
        if (ioperm(0x378, 3, 1)) {
            // something went wrong
            throw std::runtime_error("Error setting permissions on parallel port.");
        }
        // set the data signals (D0-7) of the port
        outb(pattern, 0x378);
        // wait
        TimeInterval duration;
        duration.measureA();
        duration.measureB();
        while (duration.compareDifference(wait) > 0) {
            duration.measureB();    
        }
        // set the data signals (D0-7) of the port to n0
        outb(0, 0x378);
    #endif
    // i386 code path ends -------------------------------------------------------
}

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