63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
/*
|
|
* Demo of the comedi_sv_*() functions
|
|
*
|
|
* 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>
|
|
#include <comedilib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <getopt.h>
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
#include "examples.h"
|
|
|
|
comedi_t *device;
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int ret;
|
|
comedi_sv_t sv;
|
|
double volts;
|
|
struct parsed_options options;
|
|
|
|
init_parsed_options(&options);
|
|
parse_options(&options, argc, argv);
|
|
|
|
device = comedi_open(options.filename);
|
|
if(!device){
|
|
comedi_perror(options.filename);
|
|
exit(-1);
|
|
}
|
|
|
|
if(options.verbose){
|
|
printf("measuring device=%s subdevice=%d channel=%d range=%d analog reference=%d\n",
|
|
options.filename, options.subdevice, options.channel, options.range, options.aref);
|
|
}
|
|
|
|
comedi_sv_init(&sv, device, options.subdevice, options.channel);
|
|
|
|
sv.range = options.range;
|
|
sv.aref = options.aref;
|
|
sv.n = 100;
|
|
|
|
ret = comedi_sv_measure(&sv, &volts);
|
|
if(ret < 0){
|
|
comedi_perror("comedi_sv_measure()");
|
|
exit(-1);
|
|
}
|
|
|
|
printf("%g\n", volts);
|
|
|
|
return 0;
|
|
}
|
|
|