Book Image

The Insider's Guide to Arm Cortex-M Development

By : Zachary Lasiuk, Pareena Verma, Jason Andrews
Book Image

The Insider's Guide to Arm Cortex-M Development

By: Zachary Lasiuk, Pareena Verma, Jason Andrews

Overview of this book

Cortex-M has been around since 2004, so why a new book now? With new microcontrollers based on the Cortex-M55 and Cortex-M85 being introduced this year, Cortex-M continues to expand. New software concepts, such as standardized software reuse, have emerged alongside new topics including security and machine learning. Development methodologies have also significantly advanced, with more embedded development taking place in the cloud and increased levels of automation. Due to these advances, a single engineer can no longer understand an entire project and requires new skills to be successful. This book provides a unique view of how to navigate and apply the latest concepts in microcontroller development. The book is split into two parts. First, you’ll be guided through how to select the ideal set of hardware, software, and tools for your specific project. Next, you’ll explore how to implement essential topics for modern embedded developers. Throughout the book, there are examples for you to learn by working with real Cortex-M devices with all software available on GitHub. You will gain experience with the small Cortex-M0+, the powerful Cortex-M55, and more Cortex-M processors. By the end of this book, you’ll be able to practically apply modern Cortex-M software development concepts.
Table of Contents (15 chapters)
1
Part 1: Get Set Up
5
Part 2: Sharpen Your Skills

Understanding secure software

While Arm Cortex-M processors come equipped with hardware features that provide fundamental protection for secure software, secure software needs to be written precisely to ensure that the whole system is secure. In this section, we will provide an overview of how software can be architected to benefit from the different hardware security features. We will then introduce Platform Security Architecture (PSA), a key security framework, and Trusted Firmware-M (TF-M), an open source reference implementation of PSA.

Many of the Arm Cortex-M processors have an MPU, which enables developers to configure the memory on their device into different regions with different protection levels. Programmers can leverage the MPU to protect critical processes such as the startup code and RTOS in a privileged partition, and the rest in unprivileged partitions. For example, static random-access memory (SRAM) can be defined as an execute-only memory region to prevent code...