Book Image

ARM?? Cortex?? M4 Cookbook

By : Dr. Mark Fisher
Book Image

ARM?? Cortex?? M4 Cookbook

By: 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.

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ARM?? Cortex?? M4 Cookbook
Dr. Mark Fisher
Mar, 2016 | 296 pages
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Table of Contents (16 chapters)
ARM Cortex M4 Cookbook
ARM Cortex M4 Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
A Practical Introduction to ARM CORTEX
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
2
C Language Programming
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
3
Programming I/O
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
4
Assembly Language Programming
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
5
Data Conversion
Data Conversion
Introduction
Setting up the ADC
Configuring general-purpose timers
Using timers to trigger conversions
Setting up the DAC
Generating a sine wave
6
Multimedia Support
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
7
Real-Time Signal Processing
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
8
Real-Time Embedded Systems
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
9
Embedded Toolchain
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
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...
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