Re: [Discuss-gnuradio] support for comedi?

[Brent M. Ledvina]

I have succesfully forced at least one driver in COMEDI to stream data
continuously. It took a minimal amount of hacking. The card is the NI
PCI-DIO-32HS, also known as a NI 6533 digitial I/O card. The driver is
the ni_pcidio.c driver in COMEDI. The changes I made are in CVS and it
should be easy for others to follow these and get other cards to
stream data.

Also, I've used this card/driver with RTAI and RT-Linux and it worked very well.

Regards,
Brent

On 10/3/05, Eric Blossom <address@hidden> wrote:
> On Mon, Oct 03, 2005 at 04:45:45AM -0400, Ilia Mirkin wrote:
> > I just ran into a project called Comedi (www.comedi.org) which seems to
> > support, even in RT kernels (or so they claim), a large number of PCI
> > data acquisition boards (including the Measurement Computing 4020, which
> > also has a separate driver in gnuradio, but I and at least one other
> > person I know have had serious stability issues with the driver in the
> > gnuradio cvs).
>
> Sorry to hear that.  Patches welcome.
>
> > It probably would not be that hard to add support to gnuradio to have a
> > comedilib source which would be able to use all of the hardware that
> > they have drivers for. By looking at their API, I can't seem to find a
> > good way to just get a data stream from the card in an efficient manner,
> > but this was a very cursory look... Anyways, just thought I'd let people
> > know it's out there.
> >
>
> > Looking over list archives, it seems like this issue has popped up
> > over the years, though the last reference to it was about 2 years
> > ago 
> > (http://lists.gnu.org/archive/html/discuss-gnuradio/2003-04/msg00073.html).
> > Was the reason it was never done that there wasn't a good way to get a
> > stream of data out of the comedi drivers or library?
> >
> >   -Ilia
>
> Hi Ilia,
>
> Thanks for the reminder about comedi.
>
> Last time I took a good look (a few years ago), there was no
> interface that supported streaming data.  It may have changed.
> If it doesn't support streaming, it's pretty much a non-starter for
> most GNU Radio applications.
>
> Eric
>
>
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--
Dr. Brent M. Ledvina
Applied Research Laboratories
University of Texas at Austin
P.O. Box 8029
Austin, TX 78713
ph # 512.835.3167
fax# 512.835.3544
http://gps.ece.cornell.edu