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

Designing bitmapped graphics


User interfaces and games can be made much more interesting using color graphics. The GLCD library includes a function called GLCD_DrawBitmap() that can be used to render 16-bit color bitmaps. Bitmaps can be designed using standard editors or downloaded from elsewhere. The following recipe shows you how to generate a simple bitmapped representation of a ball that can be used with the helloBounce and helloPong recipes we developed in Chapter 2, C Language Programming. We'll call this recipe bitmapBounce_c6v0.

How to do it…

To design bitmapped graphics, follow these instructions:

  1. Create a color bitmap of width 16 pixels and height 24 pixels using the Windows Paint application. A screenshot of what this should look like is displayed, as follows:

  2. Save the ball icon as a standard 24-bit bitmap, with the filename as ball.bmp.

  3. Use GIMP (http://www.gimp.org) to convert the 24-bit-per-pixel bitmap to a 16-bit-per-pixel format and store the pixel values in an array. First install...