a06bba542a
comedi_get_gate_source(), and comedi_get_routing(). Added "channel" parameter to some of the INSN_CONFIG wrappers.
98 lines
3 KiB
C
98 lines
3 KiB
C
/*
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* NI general-purpose counter example. Configures the counter to
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* start simple event counting. The counter's value can be read
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* with the inp demo. Different clock sources can be chosen
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* with the choose_clock demo.
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* Part of Comedilib
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*
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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 National Instruments general-purpose
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* counter, and comedi driver version 0.7.74 or newer.
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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 <math.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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int ni_gpct_start_simple_event_counting(comedi_t *device, unsigned subdevice)
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{
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int retval;
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lsampl_t counter_mode;
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static const unsigned initial_count = 0;
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retval = comedi_reset(device, subdevice);
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if(retval < 0) return retval;
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retval = comedi_set_gate_source(device, subdevice, 0, 0, NI_GPCT_GATE_PIN_GATE_SELECT(0) /* NI_GPCT_GATE_PIN_i_GATE_SELECT *//*| CR_EDGE*/);
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if(retval < 0) return retval;
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retval = comedi_set_gate_source(device, subdevice, 0, 1, NI_GPCT_DISABLED_GATE_SELECT | CR_EDGE);
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if(retval < 0)
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{
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fprintf(stderr, "Failed to set second gate source. This is expected for older boards (e-series, etc.)\n"
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"that don't have a second gate.\n");
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}
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counter_mode = NI_GPCT_COUNTING_MODE_NORMAL_BITS;
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// output pulse on terminal count (doesn't really matter for this application)
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counter_mode |= NI_GPCT_OUTPUT_TC_PULSE_BITS;
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/* Don't alternate the reload source between the load a and load b registers.
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Doesn't really matter here, since we aren't going to be reloading the counter.
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*/
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counter_mode |= NI_GPCT_RELOAD_SOURCE_FIXED_BITS;
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// count up
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counter_mode |= NI_GPCT_COUNTING_DIRECTION_UP_BITS;
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// don't stop on terminal count
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counter_mode |= NI_GPCT_STOP_ON_GATE_BITS;
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// don't disarm on terminal count or gate signal
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counter_mode |= NI_GPCT_NO_HARDWARE_DISARM_BITS;
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retval = comedi_set_counter_mode(device, subdevice, 0, counter_mode);
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if(retval < 0) return retval;
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/* set initial counter value by writing to channel 0. The "load a" and "load b" registers can be
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set by writing to channels 1 and 2 respectively. */
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retval = comedi_data_write(device, subdevice, 0, 0, 0, initial_count);
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retval = comedi_arm(device, subdevice, NI_GPCT_ARM_IMMEDIATE);
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if(retval < 0) return retval;
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return 0;
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}
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int main(int argc, char *argv[])
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{
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comedi_t *device;
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int retval;
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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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{
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comedi_perror(options.filename);
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exit(-1);
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}
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/*FIXME: check that device is counter */
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printf("Initiating simple event counting on subdevice %d.\n", options.subdevice);
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retval = ni_gpct_start_simple_event_counting(device, options.subdevice);
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if(retval < 0) return retval;
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return 0;
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}
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