You're reading from Mastering Embedded Linux Programming - Third Edition

Product type Book

Published in May 2021

Publisher Packt

ISBN-13 9781789530384

Pages 758 pages

Edition 3rd Edition

Languages

Concepts

Embedded Systems

Authors (2):

Frank Vasquez

Chris Simmonds

View More author details

Table of Contents (27) Chapters

Preface

1. Section 1: Elements of Embedded Linux

2. Chapter 1: Starting Out

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

Probing SPI signals with a logic analyzer

Even if you succeeded in receiving NMEA from your GPS module, you should attach a logic analyzer such as the Saleae Logic 8 if you have one. Probing the SPI signals helps us understand how the SPI protocol works and acts as a powerful debugging aid when things go wrong. In this section, we will use a Saleae Logic 8 to sample the SPI signals between the BeagleBone Black and ZOE-M8Q. If something is noticeably off with any of the four SPI signals, then a logic analyzer should make that mistake readily apparent.

The Saleae Logic 8 requires a laptop or desktop computer with a USB 2.0 port. The Saleae Logic 1 software is available for Linux, Mac OS X, and Windows. There is an installdriver.sh script that comes with the Linux version of Logic that grants the software permission to access the device. Find that script in the Logic installation's Drivers directory and run it from the command line so that you do not need to launch Logic with...