FriendlyELEC-Forum

Posted: **Thu Aug 31, 2017 8:14 pm**

Hello.

I am trying to manipulate a GPIO pin to reset a radio that communicates serially on the NanoPi Neo2's UART1. I am using the Ubuntu Core image from 6/30/2017, which according to the Wiki has RPi.GPIO_NP already installed, so the installation directions simply say you don't have to install it since it is already installed.

Well, this is a bit of an issue for me, because I have written my whole project in python 3, and after experiencing a radio lockup which requires resetting the radio to recover, I decided I needed a wire to the radio reset which I will pulse whenever a certain amount of time passes since the radio last communicated with the Neo2. After running:

find /usr | grep -i gpio

I'm able to see that the RPi.GPIO is installed in the python 2.7 directory. I would like to install it for python 3, but can't find where I can obtain it to install it. If I try to install regular RPi.GPIO (for a real RasPi) I get "This module can only be run on a Raspberry Pi!". If I try to force my project to run with python 2, it finds the correct module and doesn't throw this error, and gets well past it before failing due to python3/2 incompatibilities.

This was my first ever python program, I'd rather not have to rewrite it for python 2 if there is a way to get RPi.GPIO for the Neo2 installed for python 3.

Any help would be greatly appreciated.

Posted: **Fri Sep 01, 2017 6:25 am**

You have to rebuild the RPi.GPIO_NP for python3, honestly I would rewrite the program for python2 instead.

Anyway, I asked the source code of this library to friendlyarm support email for RPi.GPIO_NP and I did not received reply. I rewrote my own version here https://github.com/auto3000/RPi.GPIO_NP consequently this is not exactly equivalent to the preinstalled version on Ubuntu.

Posted: **Fri Sep 01, 2017 12:34 pm**

Thanks. I just grabbed your github repo, ran

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sudo python3 setup.py install

like normal, checked the install with

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find /usr | grep -i gpio

which gave the following output:

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(myVenv) pi@NanoPi-NEO2:~/pyGateway/pyEnvs$ find /usr | grep -i gpio
/usr/bin/gpio_test.sh
/usr/local/bin/gpio
/usr/local/lib/python2.7/dist-packages/RPi/GPIO.so
/usr/local/lib/python2.7/dist-packages/RPi.GPIO-0.5.8.egg-info
/usr/local/lib/python3.5/dist-packages/RPi/GPIO.cpython-35m-aarch64-linux-gnu.so
/usr/local/lib/python3.5/dist-packages/RPi/GPIO
/usr/local/lib/python3.5/dist-packages/RPi/GPIO/__init__.py
/usr/local/lib/python3.5/dist-packages/RPi/GPIO/__pycache__
/usr/local/lib/python3.5/dist-packages/RPi/GPIO/__pycache__/__init__.cpython-35.pyc
/usr/local/lib/python3.5/dist-packages/RPi/_GPIO.cpython-35m-aarch64-linux-gnu.so
/usr/local/lib/python3.5/dist-packages/RPi.GPIO-0.5.11.egg-info
/usr/local/lib/python3.5/dist-packages/RPi.GPIO-0.6.3.egg-info
/usr/local/share/man/man1/gpio.1

It appeared to me as if it installed correctly. However, upon running my python code, with the first line being

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import RPi.GPIO as GPIO

I get

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ImportError: No module named 'RPi'

Any thoughts on what I'm missing here?

Posted: **Fri Sep 01, 2017 12:45 pm**

Seems it wasn't finding it while in my virtual environment. Using

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python3 myCode.py

after deactivating the virtual environment, I'm able to run my project, at least until the point of failure from a bug in a new, unrelated feature I've implemented but haven't debugged yet.

If you know how to make it work from my virtual environment, I'd be very appreciative. If not, thanks for getting me this far already

Posted: **Fri Sep 01, 2017 9:26 pm**

Thanks for your feedback, good to see you already fixed most problems.

If you know how to make it work from my virtual environment, I'd be very appreciative. If not, thanks for getting me this far already

I can't really help, may stackoverflow help you or another user there. Anyway I got this behavior in the past while installing a python library (with pip3 I think) and fixed the issue by deleting my virtual environment and regenerate the whole.

Posted: **Sat Sep 02, 2017 12:17 pm**

Try running

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sudo python3 setup.py install

while you're in your virtual environment in the first place

FriendlyELEC-Forum

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Re: Help with RPi.GPIO_NP on Neo2 in python 3 project