how to read GPIO values from command line?

[Eric Bénard]

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

Eric
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