Re: Streaming acquisition from more than one subdevices

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On Friday 12 November 2004 11:08 am, Calin A. Culianu wrote:
> On Tue, 2 Nov 2004, Frank Mori Hess wrote:
> > It's a limitation of comedi at present, you can only have one
> > subdevice that supports read commands and one that supports write.  In
> > addition, your board hardware doesn't support dio commands.
>
> Is this limitation one that the comedi author(s) feel is justified
> given the boards out there?  I.E. is it a rare situation when the
> board(s) installed in a machine could readily support multiple asynch.
> IO on multiple subdevices (esp. in realtime) without stepping on each
> other's toes?  In other words, would it be terribly hard for someone to
> come along some time in the future and modify the comedi internals to
> support multiple input commands on multiple subdevices?  Or would it
> create a buggy and horribly messy situation due to the way the boards
> themselves are designed?

It is uncommon for a board's hardware to support more than 1 streaming read 
and 1 write subdevice.  I definitely intend to remove the limitation in 
comedi eventually though, maybe by having a device file for each streaming 
subdevice using sysfs.

- -- 
Frank

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Received on 2004-11-15Z02:25:48