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

Introduction


In the last chapter, we used the audio codec's beep generator to play a tune, but if you looked at the codec manufacturer's data sheet, you must have noticed that the device can do much more. Audio signals can be recorded by connecting a microphone to the evaluation board's stereo analog audio input, and the signal can be sampled using the audio codec's on-chip ADC. Digital audio can be played by sending digital samples to the codec, and the left and right speakers can be driven by the output of an on-chip DAC. A dedicated digital serial audio interface using a protocol called I2S (I2S, or IIS) conveys digital samples between the microcontroller and audio codec. Inter-IC-Sound (I2S) or Integrated Interchip Sound (IIS) is a serial bus interface standard developed by Phillips Semiconductors in 1986 (revised 1996) that is used to connect digital audio devices together. This specification is widely available online (for example, www.cypress.com). Unfortunately, the STM32F400 evaluation...