Raspberry Pi and GPIO

[Andrew Kluthe]

No specific information I can help with but this seems like it might hold
some answers for you if you dig enough.

http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=73924

On Thu, Oct 9, 2014 at 1:43 PM, Michael Doub <mikedoub at gmail.com> wrote:

> I think that I have now confirmed that it is a permission issue.   I added
> a “sudo” in front of the “echo” command.  Now everything seems to be
> working.
>
> I still have the question about how to give livecode the correct
> permissions to access this files as it would seem more logical to use to do
> direct IO to the files rather that to be forced to use a shell command.
>
> I am running as the default pi user.   Should this user have different
> permissions?  If so how do you grant them?
>
> Regards,
>   Mike
>
>
> On Oct 9, 2014, at 2:21 PM, Michael Doub <mikedoub at gmail.com> wrote:
>
> > I am looking for some help from some of you with unix/raspberry pi
> experience.
> >
> > I have think that I have installed 7.0 rc 1 on my raspberry pi B+
> properly.   I am trying to figure out how to play with the GPIO’s.
> >
> > I am am able to execute the following to set up the IO
> >
> >        put shell("echo 12 > /sys/class/gpio/export") into dummy
> >
> > dummy is empty,   However the next statement:
> >
> >        put shell("echo out > /sys/class/gpio/gpio12/direction") into
> dummy
> >
> >
> > dummy contains the error message:
> >
> >       bin/sh: cannot create /sys/class/gpio/gpio12/direction:  Directory
> nonexistent
> >
> > When I use the terminal, I can see that the directory does exist and I
> am able to modify the contents to both set the IO direction and sucessfully
> turn the LED on and off.
> >
> > Could it be that I do not have the permission to create directories and
> modify files from livecode?   How can I check this from livecode and fix
> it?  …. assuming this is in fact a permission issue.
> >
> > Thanks,
> >   Mike
> >
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-- 
Regards,

Andrew Kluthe
andrew at ctech.me