63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/*
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* Digital I/O example
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* Part of Comedilib
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*
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* Copyright (c) 1999,2000 David A. Schleef <ds@schleef.org>
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*
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* This file may be freely modified, distributed, and combined with
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* other software, as long as proper attribution is given in the
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* source code.
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*/
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/*
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* Requirements: A board with a digital I/O subdevice. Not just
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* a 'digital input' or 'digital output' subdevice, but one in
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* which the channels can be configured between input and output.
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*/
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#include <stdio.h>
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#include <comedilib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ctype.h>
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#include "examples.h"
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comedi_t *device;
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int main(int argc, char *argv[])
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{
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int ret;
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int stype;
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struct parsed_options options;
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init_parsed_options(&options);
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parse_options(&options, argc, argv);
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device = comedi_open(options.filename);
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if(!device){
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comedi_perror(options.filename);
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exit(-1);
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}
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stype = comedi_get_subdevice_type(device, options.subdevice);
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if(stype != COMEDI_SUBD_DIO){
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printf("%d is not a digital I/O subdevice\n", options.subdevice);
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exit(-1);
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}
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printf("configuring pin %d or subdevice %d ", options.channel, options.subdevice);
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if(options.value)
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{
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printf("for output.\n");
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ret = comedi_dio_config(device, options.subdevice, options.channel, COMEDI_OUTPUT);
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}else
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{
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printf("for input.\n");
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ret = comedi_dio_config(device, options.subdevice, options.channel, COMEDI_INPUT);
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}
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return 0;
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}
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