Re: doubt regarding DT2821 (ao_waveform error)

From: Senthil Kumar SNR <snrsk_at_yahoo.com> · Date: Thu, 1 Aug 2002 04:35:29 -0700 (PDT)

Hi
Even after using the patch it shows the same type of
error such that it seems does'nt support comedi
command. 
The displayed output is :

start :   	int     0
scan_begin:	timer	1000000
convert:	now	0
scan_end:	count	2
stop:		none	0
comedi_command_test: Invalid argument

Should we have to make changes in the comedi_cmd
structure or else any other way....?

Pls help.

senthil

--- David Schleef <ds_at_schleef.org> wrote:
> On Wed, Jul 31, 2002 at 04:30:09AM -0700, Senthil
> Kumar SNR wrote:
> > I am using DT2821 board and configured
> comedi-0.7.64
> > and comedilib-0.7.18. All configured fine and when
> we
> > try to execute the ./info it shows the 3 available
> > subdivices. But when we try to execute the
> ao_waveform
> > it gives the error as : 
> > 
> > comedi_comnand : Resource temporarily unavailable.
> 
> comedi_command() causing an EAGAIN error means that
> the command
> is incompatible with the subdevice.  It's a strange
> error number
> because you're supposed to verify that commands are
> compatible
> with a subdevice first.  As I am just noticing,
> ao_waveform does
> not do this correctly.  Here's a patch.
> 
> 
> 
> dave...
> 
> 
> Index: ao_waveform.c
>
===================================================================
> RCS file: /var/cvs/comedilib/demo/ao_waveform.c,v
> retrieving revision 1.13
> diff -u -r1.13 ao_waveform.c
> --- ao_waveform.c	7 Jun 2002 00:16:42 -0000	1.13
> +++ ao_waveform.c	31 Jul 2002 20:46:54 -0000
> _at__at_ -163,6 +163,18 _at__at_
>  
>  	dump_cmd(stdout,&cmd);
>  
> +	err = comedi_command_test(dev, &cmd);
> +	if (err < 0) {
> +		comedi_perror("comedi_command_test");
> +		exit(1);
> +	}
> +
> +	err = comedi_command_test(dev, &cmd);
> +	if (err < 0) {
> +		comedi_perror("comedi_command_test");
> +		exit(1);
> +	}
> +
>  	if ((err = comedi_command(dev, &cmd)) < 0) {
>  		comedi_perror("comedi_command");
>  		exit(1);
> 
> _______________________________________________
> comedi mailing list
> comedi_at_comedi.org
>
https://cvs.comedi.org/cgi-bin/mailman/listinfo/comedi

=====
S.N.R.SENTHILKUMAR
PROJECT ASSOCIATE
AU-KBC RESEARCH CENTER 
MIT CAMPUS  OF ANNA UNIVERSITY
CHROMEPET
CHENNAI-600044. 
PHONE : +91-44-2232711,2234885 ,EXTN: 40,   FAX : +91-44-2231034

__________________________________________________
Do You Yahoo!?
Yahoo! Health - Feel better, live better
http://health.yahoo.com