Re: [microblaze-uclinux] Write to GPIO

[Dag Mattis Pettersen <dagmatti@xxxxxxxxxxxxxxxxxx>]

Hi,

thanks for the input! I can set the outputs now. I did not realize that 
the tristate command actually uses the "mask" field to set the data 
direction.



-mattis



On Fri, 7 Apr 2006, Paul Hartke wrote:

> Here is the trick I needed:
> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/archive/2005/11/msg00237.html
>
> I guess it is still up in the air on how to handle this longer term.
>
> Paul
>
> Quoting Dag Mattis Pettersen <dagmatti@xxxxxxxxxxxxxxxxxx>:
> > Hi all,
> >
> > hope you guys are not yet tired from my newbie questions. :-)
> >
> >
> > I'm trying to use the GPIO to read the buttons and set the LEDs on my
> > ml401 card.
> >
> > I added
> >
> > ifdef CONFIG_XILINX_GPIO
> > DEVICES +=      \
> >          gpio,c,10,185
> >
> > to my vendors/Xilinx/uclinux-auto/Makefile, and I got the /dev/gpio
> > device. Now I can compile a simple program and read the buttons
> > (IBMGPIO_IN), but for some reason I cannot set the LEDs with IBMGPIO_OUT.
> > Is there some trick I have to do to make this work?
> >
> > Thanks in advance!
> >
> > --
> > Sincerely Mattis
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--
mvh Mattis
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