You're reading from Mastering Embedded Linux Programming Create fast and reliable embedded solutions with Linux 5.4 and the Yocto Project 3.1 (Dunfell)

Product type Paperback

Published in May 2021

Publisher Packt

ISBN-13 9781789530384

Length 758 pages

Edition 3rd Edition

Languages

C++

Tools

Linux

Concepts

Embedded Systems

Authors (2):

Frank Vasquez

Mr. Chris Simmonds

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Table of Contents (27) Chapters

Preface

1. Section 1: Elements of Embedded Linux

2. Chapter 1: Starting Out FREE CHAPTER

3. Chapter 2: Learning about Toolchains

4. Chapter 3: All about Bootloaders

5. Chapter 4: Configuring and Building the Kernel

6. Chapter 5: Building a Root Filesystem

7. Chapter 6: Selecting a Build System

8. Chapter 7: Developing with Yocto

9. Chapter 8: Yocto Under the Hood

10. Section 2: System Architecture and Design Decisions

11. Chapter 9: Creating a Storage Strategy

12. Chapter 10: Updating Software in the Field

13. Chapter 11: Interfacing with Device Drivers

14. Chapter 12: Prototyping with Breakout Boards

15. Chapter 13: Starting Up – The init Program

16. Chapter 14: Starting with BusyBox runit

17. Chapter 15: Managing Power

18. Section 3: Writing Embedded Applications

19. Chapter 16: Packaging Python

20. Chapter 17: Learning about Processes and Threads

21. Chapter 18: Managing Memory

22. Section 4: Debugging and Optimizing Performance

23. Chapter 19: Debugging with GDB

24. Chapter 20: Profiling and Tracing

25. Chapter 21: Real-Time Programming

26. Other Books You May Enjoy

Measuring power usage

For the examples in this chapter, we need to use real hardware rather than virtual. This means that we need a BeagleBone Black with working power management. Unfortunately, the BSP for the BeagleBone that comes with the meta-yocto-bsp layer does not include the necessary firmware for the Power Management IC (PMIC), so we will use
a pre-built Debian image instead. The missing firmware might exist in the meta-ti layer, but I did not investigate that. The procedure for installing Debian on the BeagleBone Black is the same as what we covered in Chapter 12, Prototyping with Breakout Boards, except for the Debian version.

To download the Debian Stretch IoT microSD card image for the BeagleBone Black, issue the following command:

$ wget https://debian.beagleboard.org/images/bone-debian-9.9-iot-armhf-2019-08-03-4gb.img.xz

10.3 (aka Buster) was the latest Debian image for AM335x-based BeagleBones at the time of writing. We will use Debian 9.9 for the exercises...

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Table of Contents (27) Chapters

Measuring power usage

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Measuring power usage

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Table of Contents (27) Chapters