New demo program.
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demo/choose_filter.c
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demo/choose_filter.c
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/*
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* INSN_CONFIG_FILTER 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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* Copyright (c) 2007 Frank Mori Hess <fmhess@users.sourceforge.net>
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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 subdevice that supports
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* INSN_CONFIG_FILTER, such as the PFI subdevice on an NI m-series
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* or 660x board.
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*/
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#define _GNU_SOURCE
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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 <string.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 retval;
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lsampl_t filter_selection;
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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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filter_selection = options.value;
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printf("Selecting filter %d on subdevice %d channel %d.\n", filter_selection, options.subdevice, options.channel);
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comedi_insn insn;
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lsampl_t data[2];
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memset(&insn, 0, sizeof(comedi_insn));
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insn.insn = INSN_CONFIG;
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insn.subdev = options.subdevice;
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insn.chanspec = options.channel;
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insn.data = data;
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insn.n = sizeof(data) / sizeof(data[0]);
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data[0] = INSN_CONFIG_FILTER;
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data[1] = filter_selection;
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retval = comedi_do_insn(device, &insn);
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if(retval < 0) comedi_perror("comedi_do_insn");
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return retval;
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}
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