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Anyone know how to access RasPi GPIO without sudo?

johnbeetem

I've finally gotten around to playing with RasPi GPIOs, using Gert van Loo and Dom's C code at the RasPi Wiki.  It works fine, except that you have to run the executable as root or use sudo to access /dev/mem.

 

Does anyone here know how to access /dev/mem as a normal user?

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  • 0

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

  • 0 in reply to Former Member

    Keith Chiem wrote:

     

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

    I like to run as a normal user most of the time so that I don't accidentally destroy system files.  I'll try your suggestion with /dev/mem, and if it doesn't work I'll take a closer look at permissions for /dev/mem.

     

    One think that's a bit different in my case is that I'm editing and running programs within the XXICC programming environment (xxicc.org).  I'm not generating a stand-alone GPIO program which I can then run using sudo.  I currently have to run XXICC using sudo, so I'm not protected form destroying system files.

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  • 0 in reply to Former Member

    Keith Chiem wrote:

     

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

    I like to run as a normal user most of the time so that I don't accidentally destroy system files.  I'll try your suggestion with /dev/mem, and if it doesn't work I'll take a closer look at permissions for /dev/mem.

     

    One think that's a bit different in my case is that I'm editing and running programs within the XXICC programming environment (xxicc.org).  I'm not generating a stand-alone GPIO program which I can then run using sudo.  I currently have to run XXICC using sudo, so I'm not protected form destroying system files.

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