Henry Vermaak wrote:
On Wed, Oct 07, 2015 at 01:09:58PM +0200, Bo Berglund wrote:
On Wed, 07 Oct 2015 10:05:03 +0200, Jonas Maebe
<jonas.ma...@elis.ugent.be> wrote:
Bo Berglund wrote on Wed, 07 Oct 2015:
How can one control the GPIO outputs on a Raspberry Pi2 without
needing the program to run as root? I am using Raspbian Wheezy and I
need to add two relays controls to my program.
This really has nothing to do with either FPC or Pascal programming in
general. Please ask such questions on the fpc-other list in the future.
I think that it really does because there must be some interface
between the FPC system and the underlying operating system managing
the hardware.
You access the GPIOs via the kernel's sysfs interface. The files are
all under /sys/class/gpio. I'd be pretty amazed if your distro doesn't
already have a udev rule to set a certain group for those files. You
probably just have to add your user to that group.
Yes, it's the gpio group. I worked through the first couple of steps as
described on the Lazarus wiki page manually (i.e. using echo from the
command line), so can confirm that it's broadly accurate as of Raspbian
"Wheezy".
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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