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 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?

rday

-- 

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

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