Re: Streaming acquisition from more than one subdevices

From: Mike Reedy <mike_reedy_at_yahoo.com> · Date: Fri, 14 Jan 2005 07:45:00 -0800 (PST)

How is Comedi at supporting multiple streaming reads
from multiple boards?  For example, a streaming read
of the AI subdevice from the first board, streaming
read of AI from the second board, and Digital Input
from a third board.  

Mike

> Frank Mori Hess wrote:
> > 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.
> 
> Maybe the 'private_data' member of 'struct file'
> could be used to store 
> information specific to a particular 'open' of the
> /dev/comediN device 
> node.  Then the device node could be opened more
> than once and each file 
> handle set to stream from a different subdevice.  In
> theory :-))
> 
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