comedilib/demo/dio.c
Frank Mori Hess fbdf65b4f5 Made parse_options() write options to a struct instead of passing
them through global variables.
2007-01-03 21:14:53 +00:00

63 lines
1.4 KiB
C

/*
* Digital I/O example
* 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.
*/
/*
* Requirements: A board with a digital I/O subdevice. Not just
* a 'digital input' or 'digital output' subdevice, but one in
* which the channels can be configured between input and output.
*/
#include <stdio.h>
#include <comedilib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>
#include "examples.h"
comedi_t *device;
int main(int argc, char *argv[])
{
int ret;
int stype;
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);
}
stype = comedi_get_subdevice_type(device, options.subdevice);
if(stype != COMEDI_SUBD_DIO){
printf("%d is not a digital I/O subdevice\n", options.subdevice);
exit(-1);
}
printf("configuring pin %d or subdevice %d ", options.channel, options.subdevice);
if(options.value)
{
printf("for output.\n");
ret = comedi_dio_config(device, options.subdevice, options.channel, COMEDI_OUTPUT);
}else
{
printf("for input.\n");
ret = comedi_dio_config(device, options.subdevice, options.channel, COMEDI_INPUT);
}
return 0;
}