How To Develop Embedded Software
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How To Develop Embedded Software

A Case Study

About the Book

This book uses an example project to illustrate each of the steps used to develop a new embedded system program.

System requirements and architecture are provided, followed by methods to estimate level of effort needed to implement them. A simple design methodology shows how to divide the system into cooperating virtual software objects, along with suggestions for their verification. Suggestions are made for coding, debugging, and verifying the virtual objects, as well as integrating them into a working program, and demonstrating the requirements have been met.

Complete source code, developed with the VSCode build environment, is an included extra with the purchase of this ebook.  The source code extra is found by clicking the extras button at the bottom of the menu found in the bottom half of your book's Library page on leanpub.

The source code implements a digital trombone, which uses a slide potentiometer to control note frequency, and an air pressure sensor with a tube into which the user blows to make notes and modulate their volume. A spring-loaded on-off switch is used to choose between saw, square, triangle, or sine waveforms. The interrupt driven, buffered DAC output is conveyed to an on-board, 3.5 mm audio jack.

The example program can be built with a free version of the GNU ARM compiler toolset on Windows, Linux, or Mac. The binary code produced can be copied to the NUCLEO-L432KC mbed icon on the desktop. Or the Visual Studio Code program from Microsoft may be used to build, load and debug the program on the target board.

About the Author

David Clifton
David Clifton

I have been an active embedded software developer for the past 35 years. Systems developed in whole or part include: Multi-parameter biofeedback system for Apple II, C and Dsp code for a television watching robot, firmware for a laser power meter, hypertext editor and math assistant for a pocket PC, autosampler firmware for a hematology instrument, robotic control and sequencer for a genetic blood assay machine, bootloader and kernel for an oximeter, portable flight planning computer, firmware for a wireless data acquisition system for bridge diagnostics, base station firmware for corrections telemetry and alcohol monitoring, communications protocol for an implantable hearing aid, usb mass storage driver, and sensor drivers for an oilfield seismic data logger, firmware for a digital theremin, a gps locator-tracker, and lora remote sensing system.

For more detailed information, see www.canyoncode.com.

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Table of Contents

  • Chapter 1: Preliminaries
    • Introduction
    • Some Definitions
  • Chapter 2: The Conceptual Map
    • Documentary Aspect of the Conceptual Map
    • Mental Aspect of the Conceptual Map
    • Layers of the Conceptual Map
    • Real Engineers
  • Chapter 3: Development Processes
  • Chapter 4: Context
  • Chapter 5: Requirements Analysis
    • Use Case Summary
    • Formal Requirements List
    • Reverse Engineering
    • Requirements Workshop
    • Requirements Model
    • Safety Issues
  • Chapter 6: Preliminary Design
    • Digital Trombone Architecture
    • Architecture Workshop
  • Chapter 7: Estimating
    • COCOMO Method
    • Modified Function Point Method
    • Add Up The Guesses Method
    • Combining The Estimates
  • Chapter 8: Tool Selection
  • Chapter 9: Hardware Support
  • Chapter 10: Detailed Design
    • Runtime Pattern for Digital Trombone
    • Module Overview Diagram for Digital Trombone
    • Module Interaction Diagrams for Digital Trombone
    • Module Catalog
  • Chapter 11: Code
    • Choice of Language
    • Choice of Hardware Access Layer
    • Coding Standards
    • Coding the Trombone Project
  • Chapter 12: Debug
    • Bug Categories
  • Chapter 13: Integrate
    • Advice for Integrators
  • Chapter 14: Verify
  • Chapter 15: Validate
  • APPENDIX A
    • Cellular Calculator Scripts for Estimating
  • APPENDIX B
    • Vendor Documents
  • Bibliography

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