Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Yocto for Raspberry Pi
  • Toc
  • feedback
Yocto for Raspberry Pi

Yocto for Raspberry Pi

By : Pierre-Jean, Mabäcker
2 (4)
close
Yocto for Raspberry Pi

Yocto for Raspberry Pi

2 (4)
By: Pierre-Jean, 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).
Table of Contents (13 chapters)
close
3
3. Mastering Baking with Hob and Toaster

The i2c bus


The i2c protocol enables us to port a master component (usually the microprocessor) and several slave devices. Several masters can share the same bus, and the same component can send slave status to the master or vice versa. However, communication takes place only between the master and one slave. Note also that the master can send a command to all slaves simultaneously (such as a sleep or reset request).

At the electrical level, the protocol uses signals alternating between high and low levels; the most common value pairs are (0, 5V) and (0, 3.3V). The SCL clock signal is generated by the master. The serial data (SDA) data signal is set high or low by the master or slave, according to the communication phase. Throughout the duration of the high segment of the SCL clock, the SDA data signal must be kept high or low, depending on whether it transmits a 1 or a 0.

Finally, as shown in the following figure, particular configurations of signals (produced by the master) can indicate...

bookmark search playlist download font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete