Book Image

ARM® Cortex® M4 Cookbook

By : Mark Fisher, Dr. Mark Fisher
Book Image

ARM® Cortex® M4 Cookbook

By: Mark Fisher, Dr. Mark Fisher

Overview of this book

Embedded microcontrollers are at the core of many everyday electronic devices. Electronic automotive systems rely on these devices for engine management, anti-lock brakes, in car entertainment, automatic transmission, active suspension, satellite navigation, etc. The so-called internet of things drives the market for such technology, so much so that embedded cores now represent 90% of all processor’s sold. The ARM Cortex-M4 is one of the most powerful microcontrollers on the market and includes a floating point unit (FPU) which enables it to address applications. The ARM Cortex-M4 Microcontroller Cookbook provides a practical introduction to programming an embedded microcontroller architecture. This book attempts to address this through a series of recipes that develop embedded applications targeting the ARM-Cortex M4 device family. The recipes in this book have all been tested using the Keil MCBSTM32F400 board. This board includes a small graphic LCD touchscreen (320x240 pixels) that can be used to create a variety of 2D gaming applications. These motivate a younger audience and are used throughout the book to illustrate particular hardware peripherals and software concepts. C language is used predominantly throughout but one chapter is devoted to recipes involving assembly language. Programs are mostly written using ARM’s free microcontroller development kit (MDK) but for those looking for open source development environments the book also shows how to configure the ARM-GNU toolchain. Some of the recipes described in the book are the basis for laboratories and assignments undertaken by undergraduates.
Table of Contents (16 chapters)
ARM Cortex M4 Cookbook
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

How to play prerecorded audio


This recipe demonstrates how to play audio clips downloaded from the Internet globally. When you search for digital audio, you will encounter two common digital audio formats: Waveform Audio File Format (WAVE or WAV) and MPEG-1, MPEG-2 Audio Layer III Format (MP3). This recipe focuses on playing WAV-encoded audio clips. The STM3241G-EVAL and STM32F4-DISCOVERY evaluation boards both include an MP3 player demo that can be ported to other systems. This recipe illustrates a skeleton that could form the basis for a similar application on the MCBSTM32F400 evaluation board. We'll call this recipe codecDemo_c7v1.

Getting ready

The easiest way to import WAV audio samples into our program is to convert them into C source code (in the same way that images were imported in Chapter 6, Multimedia Support). A number of programs to manipulate WAV files and write samples to a C source file are available. This recipe uses a free converter by Colin Seymour called WAVtoCode that...