Re: [Xenomai-help] National Instruments PCI-6711

[Alexis Berlemont <alexis.berlemont@domain.hid>]

Hi,

Ettore Pedretti wrote:
> Hi,
> 
> > On the other side, that is just the theory. I would not be surprised
> > to find a Comedi driver which proposes the behaviour you ask thanks to
> > a driver-specific hidden cheat flag somewhere in the structure.
> 
> How can I find out the "hidden cheat" and how can I exploit it?
> 

That was just a supposition. I have not seen such a thing in the
Analogy NI driver (inherited from the Comedi one). Have you had a look
at the Comedi list ?

I just read again your first mail. You said the NI Linux driver
provides the requested option. Do you have any source code ? I
remember just having found a binary driver.

> >> What is the closest functionality I can get to programming the card
> >> and letting it run without further intervention?
> >>
> >
> > I have no answer so far. That would need an extension of the framework.
> 
> How difficult would that be? Is it a major change to the framework? It
> seems to me that this is a nice option. You would not use any of your
> bus bandwidth and could just change the waveform when you need it.
> 

I agree this feature would be nice but I cannot tell you that I will
add some tricky code in some corner just to let this option work. The
problem with the command system is that it expects a continuous data
transfer until the end of the acquisition. 

Maybe, a way to quickly implement it would be to use an instruction
(it may be possible, I cannot ensure you); but to do so I need the
code which properly programs the DAQ-STC. 

> Ettore
> 
> >> All the best
> >> Ettore
> >>
> >> _______________________________________________
> >> Xenomai-help mailing list
> >> Xenomai-help@domain.hid
> >> https://mail.gna.org/listinfo/xenomai-help
> >
> > --
> > Alexis.
> >
> 
> 
> 
> -- 
> Ettore Pedretti, SUPA
> School of Physics and Astronomy
> University of St Andrews, North Haugh,
> St Andrews, Fife, KY16 9SS, Scotland
> Ph: +44-1334-461666, Fax: +44-1334-463104
> The University of St Andrews is a charity registered in Scotland : No SC013532

-- 
Alexis.