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

Using the debugger


uVision5 provides a debugger that allows us to suspend execution (by inserting a breakpoint), and examine/change values of variables used in our program.

How to do it…

  1. Download and run the previous project, debug_ADC.

  2. Use the debug menu to insert a breakpoint on line 96 of our program (that is, at the statement ADC_StartConversion ( );.

  3. Select debugStart/Stop Debug session to start a debug session.

  4. Observe that execution stops at main. This is because the default project debug options are set to "Run to main".

  5. Selecting Run (F5) will execute the statements up until the breakpoint.

  6. Use Step (F11) to execute the statements in the program one after the other, and observe the values of variables. For example, when we reach line 39 (after stepping), the local variable ADCvalue is assigned to 10 (0x0000000A). This value is shown in the Call Stack + Locals window.

See also

This chapter has introduced many more programming concepts than would normally be covered in the first few chapters...