90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/*
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* A very small one-shot input demo
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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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A little input demo
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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 <math.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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lsampl_t data;
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int ret;
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comedi_range * range_info;
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lsampl_t maxdata;
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double physical_value;
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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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if(options.verbose){
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printf("measuring device=%s subdevice=%d channel=%d range=%d analog reference=%d\n",
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options.filename, options.subdevice, options.channel, options.range, options.aref);
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}
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ret = comedi_data_read(device, options.subdevice, options.channel, options.range, options.aref, &data);
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if(ret < 0){
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comedi_perror(options.filename);
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exit(-1);
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}
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if(options.physical) {
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comedi_set_global_oor_behavior(COMEDI_OOR_NAN);
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range_info = comedi_get_range(device, options.subdevice, options.channel, options.range);
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maxdata = comedi_get_maxdata(device, options.subdevice, options.channel);
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if(options.verbose) {
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printf("[0,%d] -> [%g,%g]\n", maxdata,
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range_info->min, range_info->max);
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}
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physical_value = comedi_to_phys(data, range_info, maxdata);
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if(isnan(physical_value)) {
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printf("Out of range [%g,%g]",
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range_info->min, range_info->max);
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} else {
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printf("%g", physical_value);
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switch(range_info->unit) {
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case UNIT_volt: printf(" V"); break;
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case UNIT_mA: printf(" mA"); break;
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case UNIT_none: break;
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default: printf(" (unknown unit %d)",
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range_info->unit);
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}
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if(options.verbose) {
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printf(" (%lu raw units)", (unsigned long)data);
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}
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}
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} else {
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printf("%lu", (unsigned long)data);
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}
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printf("\n");
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return 0;
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}
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