Incorrect output from comedi w/ PCI-DAS6034 Card...

Hi all,

I finally got around to connecting my analog device to my card (Measurement
Computing PCI-DAS6034) and I get invalid output. The output from my analog
device while running showed 64.1mV and my modified version of demo/tut2 showed 
1073833120 16385.1

Why is this? I have included below my modified tut2.c program and the output
from demo/info hopefully you all can help me figure this out.

Thanks,

Eric .


///////////////// Modified tut2.c program /////////////////////////////

 * Modified tutorial example #2
 * Part of Comedilib
 *
 * Copyright (c) 1999,2000 David A. Schleef <ds_at_schleef.org>
 *
 * This file may be freely modified, distributed, and combined with
 * other software, as long as proper attribution is given in the
 * source code.
 */

#include <stdio.h>              /* for printf() */
#include <comedilib.h>

int subdev = 0;                 /* change this to your input subdevice */
int chan = 0;                   /* change this to your channel */
int range = 2;                  /* more on this later */
int aref = AREF_DIFF;           /* more on this later */
//int aref = 0;         /* more on this later */

int main(int argc, char *argv[])
{
        comedi_t *cf;
        lsampl_t data;
        int maxdata;
        double volts;
        comedi_range *cr;

        cf = comedi_open("/dev/comedi0");
        maxdata = comedi_get_maxdata(cf, subdev, chan);
        cr = comedi_get_range(cf, subdev, chan, range);
        comedi_data_read(cf, subdev, chan, range, aref, &data);
        volts = comedi_to_phys(data, cr, maxdata);
        printf("%d %g\n", data, volts);

        return 0;
}


// Modified tutorial example #2 output
// daq:/mla# ./m_tut2
// 1073833120 16385.1

//////////// end modified tut2.c ///////////////////////

/////////// output from demo/info //////////////////////
overall info:
  version code: 0x000745
  driver name: cb_pcidas64
  board name: pci-das6034
  number of subdevices: 10
subdevice 0:
  type: 1 (analog input)
  number of channels: 16
  max data value: 65535
  ranges:
    all chans: [-10,10] [-5,5] [-0.5,0.5] [-0.05,0.05]
  command:
    start: now|ext
    scan_begin: follow|timer
    convert: timer|ext
    scan_end: count
    stop: none|count|ext
  command fast 1chan:
    start: now 0
    scan_begin: follow 0
    convert: timer 5000
    scan_end: count 1
    stop: count 2
subdevice 1:
  type: 0 (unused)
subdevice 2:
  type: 0 (unused)
subdevice 3:
  type: 0 (unused)
subdevice 4:
  type: 5 (digital I/O)
  number of channels: 24
  max data value: 1
  ranges:
    all chans: [0,5]
  command:
    not supported
subdevice 5:
  type: 5 (digital I/O)
  number of channels: 8
  max data value: 1
  ranges:
    all chans: [0,5]
  command:
    not supported
subdevice 6:
  type: 9 (calibration)
  number of channels: 8
  max data value: 255
  ranges:
    all chans: [0,1]
  command:
    not supported
subdevice 7:
  type: 0 (unused)
subdevice 8:
  type: 8 (memory)
  number of channels: 128
  max data value: 65535
  ranges:
    all chans: [0,1]
  command:
    not supported
subdevice 9:
  type: 0 (unused)

//////////////////////// end demo/info output ////////////////////

Received on 2005-02-24Z20:33:17