Book Image

Yocto for Raspberry Pi

By : TEXIER Pierre-Jean, Petter Mabäcker
Book Image

Yocto for Raspberry Pi

By: TEXIER Pierre-Jean, Petter Mabäcker

Overview of this book

The Yocto Project is a Linux Foundation workgroup, which produces tools (SDK) and processes (configuration, compilation, installation) that will enable the creation of Linux distributions for embedded software, independent of the architecture of embedded software (Raspberry Pi, i.MX6, and so on). It is a powerful build system that allows you to master your personal or professional development. This book presents you with the configuration of the Yocto Framework for the Raspberry Pi, allowing you to create amazing and innovative projects using the Yocto/ OpenEmbedded eco-system. It starts with the basic introduction of Yocto's build system, and takes you through the setup and deployment steps for Yocto. It then helps you to develop an understanding of Bitbake (the task scheduler), and learn how to create a basic recipe through a GPIO application example. You can then explore the different types of Yocto recipe elements (LICENSE, FILES, SRC_URI, and so on). Next, you will learn how to customize existing recipes in Yocto/OE layers and add layers to your custom environment (qt5 for example).

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Yocto for Raspberry Pi
TEXIER Pierre-Jean | Petter Mabäcker
Jun, 2016 | 214 pages
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Table of Contents (18 chapters)
Yocto for Raspberry Pi
Yocto for Raspberry Pi
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Meeting the Yocto Project
Meeting the Yocto Project
The Yocto Project
The core components
Yocto Project - workflow
Summary
2
Building our First Poky Image for the Raspberry Pi
Building our First Poky Image for the Raspberry Pi
Installing the required packages for the host system
Building the Poky image
Booting the image on the Raspberry Pi
Summary
3
Mastering Baking with Hob and Toaster
Mastering Baking with Hob and Toaster
Hob
Exploring Toaster
Summary
4
Understanding BitBake
Understanding BitBake
BitBake
Metadata
Parsing metadata
Preferences and providers
Dependencies
Fetching
Understanding BitBake's tasks
Summary
5
Creating, Developing, and Deploying on the Raspberry Pi
Creating, Developing, and Deploying on the Raspberry Pi
Software development kits (SDKs)
Raspberry Pi and a package manager
IPK packages
Our application - an introduction
Our application - creating the recipe
Summary
6
Working with External Layers
Working with External Layers
Introducing layers
The basic concepts of layers
Adding external layers to the Raspberry Pi
Summary
7
Deploying a Custom Layer on the Raspberry Pi
Deploying a Custom Layer on the Raspberry Pi
Creating the meta-packt_rpi layer with the yocto-layer script
Adding gpio-packt to meta-packt_rpi
Patching gpio-packt
Creating the raspberry-packt-image.bb image
Deploying the raspberry-packt-image.bb image
Summary
8
Diving into the Raspberry Pi's Peripherals and Yocto Recipes
Diving into the Raspberry Pi's Peripherals and Yocto Recipes
The SPI bus
The i2c bus
The Wii Nunchuck
The Raspberry Pi connection
Summary
9
Making a Media Hub on the Raspberry Pi
Making a Media Hub on the Raspberry Pi
Project description – CPU temperature monitoring
Creating the main application
Creating the Yocto/OE environment
Deploying raspberry-packt-image
Testing the application
The future of this project
Summary
10
Playing with an LCD Touchscreen and the Linux Kernel
Playing with an LCD Touchscreen and the Linux Kernel
The Linux kernel
Setting up an LCD display for the Raspberry Pi using the Yocto Project
Developing applications and using them on an LCD display
Summary
11
Contributing to the Raspberry Pi BSP Layer
Contributing to the Raspberry Pi BSP Layer
Open source
Contributing to open source projects
Exploring Git
Contributing to the Yocto Project
Summary
12
Home Automation Project - Booting a Custom Image
Home Automation Project - Booting a Custom Image
Home automation using a Raspberry Pi
Setting up the base for the project
Creating the server side
Creating a packet list for your image
Putting it all together
Controlling the relay using the Raspberry Pi
Controlling the lamp using the Raspberry Pi
Turning on/off the lamp from a smartphone
Extra - using a Raspberry Pi with an LCD as the client
Summary

Creating the Yocto/OE environment

Now that we have developed the main application, what remains for us is to integrate it with our Yocto RPI environment.

Modifying the image

The first step consists of integrating the nodejs package (located at meta-openembedded/meta-oe/recipes-devtools/nodejs) with the Raspberry Pi environment. For this, we have to add the following line to raspberry-pack-image:

# Base this image on core-image-minimal 
include recipes-core/images/core-image-minimal.bb 
DESCRIPTION = "Image for raspberry-pi" 
IMAGE_FEATURES += "ssh-server-dropbear splash" 
# Include modules in rootfs 
IMAGE_INSTALL += " \ 
    kernel-modules \ 
    gpio-packt    \ 
    i2c-tools    \ 
    spitools    \ 
    nunchuck    \ 
    v4l-utils    \ 
    nodejs    \     
"

We have now integrated nodejs with our Poky distro.

Creating the recipe file

The second step consists of creating the recipe file; let's call this recipe webserver-packt_01.bb.

The idea is to have the following architecture inside the...

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