ARM?? Cortex?? M4 Cookbook

ARM?? Cortex?? M4 Cookbook

By : Dr. Mark Fisher

Buy this Book

ARM?? Cortex?? M4 Cookbook

By: Dr. Mark Fisher

Buy this Book

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.

ARM Cortex M4 Cookbook

Credits

About the Author

About the Reviewer

www.PacktPub.com

Preface

Free Chapter

A Practical Introduction to ARM CORTEX

Introduction

Installing uVision5

Linking an evaluation board

Running an example program

Writing a simple program

Understanding the simple use of GPIO

Estimating microcontroller performance

C Language Programming

Introduction

Configuring the hardware abstraction layer

Writing a C program to blink each LED in turn

Writing a function

Writing to the console window

Writing to the GLCD

Creating a game application – Stage 1

Creating a game application – Stage 2

Debugging your code using print statements

Using the debugger

Programming I/O

Introduction

Performing arithmetic operations

Illustrating machine storage classes

Configuring GPIO ports

Configuring UART ports

Handling interrupts

Using timers to create a digital clock

Assembly Language Programming

Introduction

Writing Cortex-M4 assembly language

Passing parameters between C and the assembly language

Handling interrupts in assembly language

Implementing a jump table

Debugging assembly language

Data Conversion

Introduction

Setting up the ADC

Configuring general-purpose timers

Using timers to trigger conversions

Setting up the DAC

Generating a sine wave

Multimedia Support

Introduction

Setting the RTE for the I2C Peripheral Bus

How to use the LCD touchscreen

Writing a driver for the audio codec

How to use the audio codec

How to use the camera

Designing bitmapped graphics

Ideas for games using sound and graphics

Real-Time Signal Processing

Introduction

Configuring the audio codec

How to play prerecorded audio

Designing a low-pass digital filter

How to make an audio tone control

Real-Time Embedded Systems

Introduction

Multithreaded programs using event flags

Multithreaded programs using mailboxes

Why ensuring mutual exclusion is important when accessing shared resources

Why we must use a mutex to access the GLCD

How to write a multithreaded Pong game

Debugging programs that use CMSIS-RTOS

Embedded Toolchain

Introduction

Installing GNU ARM Eclipse

Programming the MCBSTM32F400 evaluation board

How to use the STM32CubeMX Framework (API)

How to port uVision projects to GNU ARM Eclipse

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Multithreaded programs using mailboxes

The event flags that we saw in the last recipe can only been used to trigger the execution of tasks. In contrast to this, mailboxes support the exchange of program data between tasks. CMSIS-RTOS provides a mailbox system that buffers messages into mail slots and queues them between the sending and receiving tasks. This recipe, RTOS_Blinky_c8v1, provides an introduction to sending fixed-length messages between tasks using mailboxes.

How to do it…

Clone the RTOS_Blinky_c8v0 folder in the Multithreaded programs using event flags recipe that we described earlier.

Replace taskA( ) with the following function definition:

void taskA (void const *argument) {
  uint32_t i=0;
  for (;;) {
    mail_t *mail = (mail_t*)osMailAlloc(mail_box,
                                           osWaitForever);
    mail->counter = i++;
    osMailPut(mail_box, mail);
    osDelay(1000);
  }
}

Replace taskB( ) with the following function definition:
```
void taskB (void const *argument...
```

ARM?? Cortex?? M4 Cookbook

By : Dr. Mark Fisher

ARM?? Cortex?? M4 Cookbook

By: Dr. Mark Fisher

Overview of this book

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Current Title:

ARM?? Cortex?? M4 Cookbook

Multithreaded programs using mailboxes

How to do it…