Installing mraa for using with Python3

barryb · June 9, 2017, 10:23pm

Hi,

As it appears that mraa is the preferred GPIO library so I’ve tried to install it on my Dragonboard.

I’ve found a number of different documented ways of install it for 96boards. Sadly none of them seems to have worked for me.

linaro@linaro-alip:~$ sudo python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[gcc 6.3.0 20170118] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mraa
>>> mraa.Gpio(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'mraa' has no attribute 'Gpio'
>>>

What is the primarily supported installation method?
Is it from source? Is there a Debian package? Is it there by default or do I have to add a new repository?

Thanks in advance,
Barry

barryb · June 11, 2017, 9:02am

I have been following the build instructions in the mraa repository which are at:

github.com

eclipse/mraa/blob/master/docs/building.md

Building libmraa                         {#building}
===============
libmraa uses cmake in order to make compilation relatively painless. CMake runs
build out of tree so the recommended way is to clone from git and make a `build/`
directory inside the clone directory.

For building imraa check @ref buildingimraa page.

## Build dependencies

Not all these are required but if you're unsure of what you're doing this is
what you'll need:
* [SWIG](http://swig.org) 3.0.5+ (3.0.12 recommended, on Xenial this can be installed via 3rd party PPAs)
* [git](http://git-scm.com)
* [python](http://python.org) 2.7 or 3.4+ (you'll need not just the interpreter but python-dev)
* [node.js](http://nodejs.org) 4.x recommended (you'll need not just the interpreter but nodejs-dev)
* [CMake](http://cmake.org) 2.8.8+ (3.1+ is recommended for node.js version 2+)
* [json-c](https://github.com/json-c/json-c) 0.12+ (0.10+ probably works in reality)

For Debian-like distros the below command installs the basic set:

This file has been truncated. show original

My issue was with a missing build dependancy for python3. I needed python3-dev e.g:

sudo apt-get install git build-essential swig3.0 python3-dev nodejs-dev cmake libjson-c-dev

Not python-dev as documented:

sudo apt-get install git build-essential swig3.0 python-dev nodejs-dev cmake libjson-c-dev

Peeyush_Tekriwal · August 28, 2019, 8:30am

Hey did you solve this issue by changing to python3-dev? I tried installing using sudo apt-get install python3-dev but it didn’t work for me

barryb · August 28, 2019, 8:45am

It solved my issue for Python3 usage on the kernel at the time.I would suggest you open a new issue specifying your OS and kernel along with the error messages you are getting.