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 use the camera


The camera is another I2C peripheral, but to display video we need to read the array pixels that make up an image and write their values to the GLCD very rapidly. We achieve this by using Direct Memory Access (DMA) to stream image frames directly to the GLCD rather than writing individual values as we did for the audio codec demo. We'll name this recipe cameraDemo_c6v0.

How to do it…

  1. Create a new project named cameraDemo. Using the RTE manager, go to Board Support and select the Camera (API) and Graphic LCD (API) software components.

  2. Set the CMSIS and Device software components, as we've done for previous projects. Set the Use MicroLIB project option.

  3. Create a file named cameraDemo.c and add boilerplate code to configure clocks, and so on. Add this file to the project.

  4. Add a main() function to the cameraDemo.c file:

  5. Build, download, and run the program, as follows:

    int main (void) {
    
      uint32_t addr;
      
      HAL_Init();         /* Initialize the HAL Library */
      SystemClock_Config...