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)

Waking up using RTC

In the preceding recipe, we were able to put our QEMU system to sleep but were not able to wake it up. We need a device that can send an interrupt to the system when most of its internal components are powered off.

The RTC (Real-time clock) is one such device. One of its functions is to keep the internal clock running when the system is off, and to do this, it has its own battery. RTC power consumption is similar to an electronic watch; it uses the same 3 V battery and can function on its power for years. 

RTC can work as an alarm clock, sending an interrupt to the CPU at a given time. This makes it an ideal device for waking up a system on schedule.

In this recipe, we will learn how to wake up a Linux system at a specific time using the built-in RTC.

How to...