Re: NI-6251: configuring PFI to behave like standard DIO

Thank you for answering so promptly.
 From what I understand, RTSI is used to synchronize two boards, so there is
no hope of using these pins for another purpose?

Another side question: why does comedi_test tell me the first DIO device has
32 channels while the pinout only give access to 8? same with subdev 7 that
is supposed to have 16 channels.

Thanks,
Matthieu

2007/6/11, Frank Mori Hess <frank.hess_at_nist.gov>:
>
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> On Friday 08 June 2007 07:34 am, Matthieu Roussel wrote:
> > My project requires reading and writing from the 3 digital subdevices
> found
> > on the NI-6251. In that respect I modified the available Simulink blocks
> to
> > get the possibility of choosing the subdevice that I want to interact
> with.
> > This works fine with the first subdevice, P0. However, the other two
> > subdevices are PFI X/P1.X and PFI X/P2.X and seem to behave natively in
> a
> > different way: I can read, but not write, on P1.X, and I dont seem to be
> > able to do anything with P2.X.
> > Seeing as these subdevices are not simple DIO, is there a special
> > configuration (besides comedi_dio_config() ) to make them behave like
> > normal DIO subdevices? or at least DI?
>
> There is INSN_CONFIG_SET_ROUTING.  Try using it on the pfi subdevice
> (7).  The
> cvs version of comedilib/include/comedi.h has various constants that can
> be
> used to select a source with INSN_CONFIG_SET_ROUTING, you probably want
> NI_PFI_OUTPUT_PFI_DO.  There is also a comedilib/demo/choose_routing demo
> program.
>
> The driver's third dio subdevice is not PFI, it is RTSI.
>
> - --
> Frank
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