Thanks WouterS and Jim Jackson. Now I understand a little better what's going
on in there.
My problem is that I'm trying to do some very fast communications through the
SPI port and I need to do some flag management through the DIO ports. I've done
some tests and when I go beyond 8 kHZ it seems that the kernel gets in the way
and creates small delays in the process.
I was trying to get past that by communicating straight to the hardware. I've
read about something called 'nice' to increase the priority of my program but I
don't know how to use it for the TS boards. Can someone point me to
documentation or tell me how it's done?
Thank you very much for your help!
--- In Jim Jackson <> wrote:
>
>
>
>
> On Thu, 15 Jul 2010, Simon wrote:
>
> > Hi, I've been using the peekpoke instructions as inline assembly and they
> > work perfectly. However, I was wondering if there's a way, using inline
> > assembly, to use these functions without mmap'ing. Maybe set some flags
> > that'd let me control the memory locations directly?
> >
> > I just want to be able to communicate with the GPIO ports directly
> > instead of having to go through virtual memory mapping. Is there a way to
> > do this?
>
> Not without having to go through virtual memory mapping.
> You can do it without using peekpoke functions.
> Once you have addresses mmap'ed, or addresses calculated from mmap'ed base
> addresses, you can use them directly. There is example code around.
> If stuck check out the ts7200.c file in any of my programs.
>
>
> cheers
> Jim
> ----------------------------------------------------------------------------
> HomePage: http://www.comp.leeds.ac.uk/jj
> TS7200 Page: http://www.comp.leeds.ac.uk/jj/linux/arm-sbc.html
>
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|