how to read GPIO values from command line?

[Robert P. J. Day]

On Thu, 9 Feb 2012, Eric Bénard wrote:

> Le Thu, 9 Feb 2012 13:37:34 -0500 (EST),
> "Robert P. J. Day" <rpjday at crashcourse.ca> a écrit :
>
> > On Thu, 9 Feb 2012, Eric Bénard wrote:
> >
> > > Le Thu, 9 Feb 2012 11:34:55 -0500 (EST),
> > > "Robert P. J. Day" <rpjday at crashcourse.ca> a écrit :
> > > >   so what exactly does one do to read those values?  i tried:
> > > >
> > > > barebox at Texas Instrument's Beagle:/ gpio_direction_input 171
> > > > barebox at Texas Instrument's Beagle:/ gpio_get_value 171
> > > >
> > > > but what do i check?  the shell variable $?  i'm not sure what i
> > > > should do next.
> > > >
> > > you can check the mux of the pins to be sure they are in GPIO mode.
> >
> >   how do i do that from the barebox prompt?  i can see the
> > gpio-related commands for setting direction and getting/setting
> > values, but how does one check if those pins are properly in gpio
> > mode?
> >
> see the corresponding registers with md

  never mind, i think i just figured out i have a lot more work ahead
of me.  i popped into the panda directory, and noticed that honking
big mux.c file, which i'm guessing i'll have for the beagle as well,
and that's a bit over my head at the moment.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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