On Thu, 16 Nov 2006, gertjan_hofman wrote:
> I finally realized I am communicating with two different people (in
> very different time zones).
>
> I agree with your comment, 'it can not be done from userspace'. Do you
> know if it can be done with the kernel driver that I am trying to get
> to compile ? If not, I am save my time and move on to a different
> vendor....
Dunno - ask the author :-) I've not used that driver. Linux is not a
realtime OS. You'd need to arrange timer interrupts at 5KHz. Somewhere in
the list Jesse (I think) posted some measurements that indicated max timer
int rates. Can't find it at moment.
cheers
Jim
> Thanks. I am also looking at your web pages & sample code.
>
> Gertjan
>
>
>
>
> --- In Jim Jackson <> wrote:
> >
> >
> >
> >
> > On Tue, 14 Nov 2006, gertjan_hofman wrote:
> >
> > > Hi Jim,
> > >
> > > Yes, I realize it can be done from userspace, but much less elegantly
> > > and there is insufficient documentation provided (for me at least) to
> > > work out the parameters I need to set.
> > >
> > > The most simplest test i need to do is to (a) set the range to +/- 10
> > > V (b) read the ADC at say 5 KHz at transfer the data (somewhere),
> > > without interupting the continous reading. This would be equivalent
> > > to the hardware we are presently using (NI-DAQ cards).
> >
> > Sounds like you are using the MAX197 option. Last I saw Technologics
> > gave code samples and all data for programming in their documentation.
> > That's what I used to write my code. Example programs available from my
> > ts7200 webpage.
> >
> > You won't be able to do 5KHz sampling from userspace.
> >
> > Jim
> >
> ----------------------------------------------------------------------------
> > HomePage: http://www.comp.leeds.ac.uk/jj
> > TS7200 Page: http://www.comp.leeds.ac.uk/jj/linux/arm-sbc.html
> >
>
>
>
>
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