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// PyEPL: hardware/eeg/pulse/eplPulse.c
//
// Copyright (C) 2003-2005 Michael J. Kahana
// Authors: Ian Schleifer, Per Sederberg, Aaron Geller, Josh Jacobs
// URL: http://memory.psych.upenn.edu/programming/pyepl
//
// Distributed under the terms of the GNU Lesser General Public License
// (LGPL). See the license.txt that came with this file.
#include "eplPulse.h"
// File descriptor
int fd = -1;
int eplOpenPort()
{
int failure = 0;
fd = open("/dev/parport0",O_WRONLY,0);
if (fd != -1)
{
// claim the port
failure = ioctl(fd,PPCLAIM);
// close if failed
if (failure)
{
// close the port
eplClosePort();
}
}
else
{
failure = -1;
}
return failure;
}
void eplClosePort()
{
if (fd != -1)
{
// release the port
ioctl(fd, PPRELEASE);
// close the port
close(fd);
fd = -1;
}
}
int eplSetPortState(int state)
{
struct ppdev_frob_struct frob;
unsigned char data;
int failure = 0;
// standard mask
frob.mask = PARPORT_CONTROL_STROBE;
// check what state to set
if (state == 0)
{
// turn it off
frob.val = 0;
data = 0;
}
else
{
// turn it on
frob.val = PARPORT_CONTROL_STROBE;
data = 0xFF;
}
// talk to the port
failure = ioctl(fd, PPWDATA, &data);
if (!failure)
{
failure = ioctl(fd, PPFCONTROL, &frob);
}
return failure;
}
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