how to read GPIO values from command line?

[Eric Bénard]

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.

Eric
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