Book Image

Embedded Programming with Modern C++ Cookbook

By : Igor Viarheichyk
Book Image

Embedded Programming with Modern C++ Cookbook

By: Igor Viarheichyk

Overview of this book

Developing applications for embedded systems may seem like a daunting task as developers face challenges related to limited memory, high power consumption, and maintaining real-time responses. This book is a collection of practical examples to explain how to develop applications for embedded boards and overcome the challenges that you may encounter while developing. The book will start with an introduction to embedded systems and how to set up the development environment. By teaching you to build your first embedded application, the book will help you progress from the basics to more complex concepts, such as debugging, logging, and profiling. Moving ahead, you will learn how to use specialized memory and custom allocators. From here, you will delve into recipes that will teach you how to work with the C++ memory model, atomic variables, and synchronization. The book will then take you through recipes on inter-process communication, data serialization, and timers. Finally, you will cover topics such as error handling and guidelines for real-time systems and safety-critical systems. By the end of this book, you will have become proficient in building robust and secure embedded applications with C++.
Table of Contents (17 chapters)

Working with packed structures

In this recipe, we will learn how to define structures that do not have any padding bytes between their data members. This may significantly reduce the amount of memory that's used by your application if it works with a large number of objects.

Note, though, that this has a cost. Unaligned memory access is slower, which results in sub-optimal performance. For some architectures, unaligned access is forbidden, thus requiring the C++ compiler to generate much more code to access the data fields than for aligned access.

Although packing your structs may result in more efficient memory usage, avoid using this technique unless it's really necessary. It has too many implied limitations that may lead to obscure, hard-to-find issues in your application later.

Consider packed structures as transport encoding and only use them to store, load...