GPIO control - need some help

Help and Support Raspberry Pi
1

Hi there, this is my first post on here, though I did a bit over at RaspBMC.

One of the things I figured out there was having an LED attached to a GPIO pin. To get this to work I had to make a few changes:

apt-get update
apt-get install -y python-dev
apt-get install -y python-pip
easy_install -b /home/osmc -U distribute
pip install rpi.gpio

I’ve tried to do the same on OSMC, but get an error when installing the last item (pip install rpi.gpio)

error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1
Complete output from command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-2hxNQg/rpi.gpio/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-C0tZLZ-record/install-record.txt --single-version-externally-managed --compile:

Can someone point e in the right direction, or tell me how else I can control the GPIO pins?

2

Are you running all those commands as root including the pip command ? BTW when I needed to install PIP to use a Python debugger I didn’t install it via APT package, I just did:

wget https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py

See the following page:

https://pip.pypa.io/en/latest/installing.html

1 Like
3

Hi, and thanks for helping.

Yes, I set a root password and use that to set everything up.

PIP installed fine (I did re-install using your instructions, which also worked fine). My knowledge level is very low with linux, most of what I have done I have learnt from other forum posts, so I am not sure I even need all of the things I am doing - I just know that they worked fine is Raspbmc.

Moving to OSMC has meant changing a lot of my backed up files so that paths point to the right place. I now have everything else working except this. I appreciate this is not something most people would mess around with, but would really like to have everything working as before.

4

It seems like

pip install rpi.gpio

may be slightly naive on the maintainer’s part as it attempts to invoke a cross compiler. Try running the following commands before that pip install command:

sudo apt-get update
sudo apt-get install build-essential
export ARCH=arm
export CROSS_COMPILE=/usr/bin/

I don’t know if this will work – i have not looked intensively at the rpi.gpio script, but hope this helps.

Sam

3 Likes
5

Thanks Sam, that has done the trick for me, now I can look into my next little project!

6

update to 09-2016
I installed OSMC build 2016-08
and these instructions not work.

I had to manually download rpi.gpio from the python repository website
browse to RPi.GPIO · PyPI
and download from there

unzip it

sudo apt-get update
sudo apt-get install gcc python-dev

cd rpi.gpio
sudo python setup.py install

7

Install RPi.GPIO via pip
(OSMC 2016.08-1)

$ sudo su
# apt-get update
# apt-get install python-pip python-dev gcc
# pip install rpi.gpio

(may showed some warnings but will successfully installed)

8

i got it installed, but i always have to run the script with sudo.
is there a way to get access rights?
i’d like to write a kodi addon for rotary encoders.

9

Is my request to simple or is there no solution to get access?

10

Does /dev/gpiomem exist ?

What are its permissions ?

https://sourceforge.net/p/raspberry-gpio-python/tickets/115/

11

I really would like the answer to this as well. Im pulling my hair out trying to write an addon for GPIO pushbuttons.

12

For me, I have to create another script with sudo command to run the script.

#!/usr/bin/python

# gpioonsudo.py
#
# gpioon.py cannot run sudo by itself

import os
os.system('/usr/bin/sudo /home/osmc/gpioon.py')

Some codes here might be useful: OSMC_GPIO

13

i got it with the udev.rules. on sunday i can post my solution.

edit:
“51-gpio.rules”
SUBSYSTEM==“bcm2835-gpiomem”, KERNEL==“gpiomem”, GROUP=“gpio”, MODE=“0660”
SUBSYSTEM==“gpio”, KERNEL==“gpiochip*”, ACTION==“add”, PROGRAM="/bin/sh -c ‘chown root:gpio /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport’"
SUBSYSTEM==“gpio”, KERNEL==“gpio*”, ACTION==“add”, PROGRAM="/bin/sh -c ‘chown root:gpio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value’"