comedilib/demo/tut1.c

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/*
 * Tutorial example #1
 * Part of Comedilib
 *
 * Copyright (c) 1999,2000 David A. Schleef <ds@schleef.org>
 *
 * This file may be freely modified, distributed, and combined with
 * other software, as long as proper attribution is given in the
 * source code.
 */

#include <stdio.h>      /* for printf() */
#include <comedilib.h>

int subdev = 0;         /* change this to your input subdevice */
int chan = 0;           /* change this to your channel */
int range = 0;          /* more on this later */
int aref = AREF_GROUND; /* more on this later */

int main(int argc,char *argv[])
{
        comedi_t *it;
        int chan = 0;
        lsampl_t data;
        int retval;

        it = comedi_open("/dev/comedi0");
        if(it == NULL)
        {
                comedi_perror("comedi_open");
                return -1;
        }

        retval = comedi_data_read(it, subdev, chan, range, aref, &data);
        if(retval < 0)
        {
                comedi_perror("comedi_data_read");
                return -1;
        }

        printf("%d\n", data);

        return 0;
}