86 lines
1.7 KiB
C
86 lines
1.7 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 <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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int i;
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parse_options(argc,argv);
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device=comedi_open(filename);
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if(!device){
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comedi_perror(filename);
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exit(0);
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}
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stype = comedi_get_subdevice_type(device,subdevice);
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if(stype!=COMEDI_SUBD_DIO){
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printf("%d is not a digital I/O subdevice\n",subdevice);
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exit(0);
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}
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printf("configuring pin %d for output...\n",channel);
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ret=comedi_dio_config(device,subdevice,channel,COMEDI_OUTPUT);
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printf("toggling pin %d rapidly...\n",channel);
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comedi_dio_write(device,subdevice,channel,1);
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#if 0
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for(i=0;i<10000;i++){
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usleep(1000000);
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comedi_dio_write(device,subdevice,channel,1);
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printf("1\n");
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usleep(1000000);
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comedi_dio_write(device,subdevice,channel,0);
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printf("0\n");
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}
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#endif
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#if 0
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{
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unsigned int mask;
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unsigned int data;
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printf("toggling pin %d rapidly (using bitfield)...\n",channel);
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mask = 1<<channel;
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for(i=0;i<10000;i++){
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data = mask;
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comedi_dio_bitfield(device,subdevice,mask,&data);
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data = 0;
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comedi_dio_bitfield(device,subdevice,mask,&data);
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}
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}
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#endif
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return 0;
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}
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