Re: How to get the sampled values on asynchronous aquisition (kernel space)

From: Pecenin <mpecenin_at_yahoo.com.br> · Date: Tue, 19 Jul 2005 17:28:33 -0300 (ART)

I've seen in:
https://cvs.comedi.org/pipermail/comedi/2004-June/006025.html
that I can read data from buffer, on kernel space,
using comedi_map(), comedi_get_buffer_offset(),
comedi_mark_buffer_read(), etc. I also look at mmap.c
example, but I can't find any documentation about how
to USE comedi_map function? what is the "ptr" argument
of comedi_map?

Pecenin

--- Andrés Cascallana Alvarez
<acascallana_at_simulare.com> escreveu:

> Use the following functions:
> comedi_get_buffer_offset,
> comedi_get_buffer_contents, comedi_mark_buffer_read.
> Search on the comedi list archives; this question
> has been already answered.
> Regards,
> 
> Andrés
> 
> 
> > Message: 2
> > Date: Mon, 18 Jul 2005 23:40:05 -0300 (ART)
> > From: Pecenin <mpecenin_at_yahoo.com.br>
> > Subject: How to get the sampled values on
> asynchronous aquisition (kernel
> space)
> > To: comedi_at_comedi.org
> >
> > Hello,
> >
> > I need write a 2.6.7 kernel module (with real-time
> > support) that use a ni-atmio-16de-10 board to
> sample a
> > signal at 6000Hz (infinite sequence of
> acquisitions).
> >
> > I see in Comedilib Reference how to configure the
> > board to asynchronous acquisition, using
> comedi_cmd
> > struct, and also run the real-time example (and
> other
> > examples) on the download area, but I do not
> > understand how to get samples (sampled values).
> What
> > function I need to use? How I manager the buffer?
> > etc...
> >
> > Someone could help-me, please!
> >
> > Someone have an example, for kernel-space with
> > asynchronous acquisition, that just "print" the
> values
> > (samples) with an infinite sequence of
> acquisitions.
> >
> > Thanks for any help!
> >
> > Sorry, english is not my native language.
> >
> > Pecenin
> 
> 
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>
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