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2.2. Embedded System Software/Firmware Development

2.2.1. Introduction to embedded system software development

Embedded system software/firmware development is the process of designing, writing, testing, debugging, and maintaining the software that controls an embedded system’s hardware.

Embedded software is a program written to perform specific functions on an embedded device.

Firmware is a type of software that is closely associated with hardware and is normally stored in non-volatile memory, such as Flash memory.

For example, in an automatic temperature-control system, the firmware tells the microcontroller how to read the temperature sensor, process the temperature, and control the fan.

Programming languages used in embedded system

Several programming languages are used in embedded development are:

  • C is one of the most important languages for embedded systems.
  • U C++ is also widely used, especially for more complex embedded applications.
  • Assembly language provides very low-level control of the processor.
  • Python is increasingly used in embedded environments such as MicroPython and CircuitPython, particularly for prototyping and educational projects.
  • Arduino IDE

Embedded software development process

Firmware development normally follows a series of steps.

Step 1: Define requirements

Determine what the embedded system must do.

Example:

The system must measure temperature and automatically control a cooling fan.

Step 2: Select hardware

For example you can choose: </strong

  • Microcontroller
  • Sensors
  • Actuators
  • Memory
  • Communication interfaces
  • Power supply

For example:

STM32 + Temperature Sensor + Fan

Step 3: Design the software architecture

Determine how the software will be organized.

For example:

Main Application → Control Algorithm → Sensor Driver → Hardware

Step 4: Write the code

The developer writes the firmware using tools such as:

  • IDE
  • Compiler
  • Debugger
  • Programmer

Examples of development environments include:

  • STM32CubeIDE
  • MPLAB X
  • Arduino IDE
  • Keil
  • PlatformIO
  • VS Code with appropriate embedded extensions

Step 5: Compile the program

The source code is converted into machine code that the microcontroller can execute.

For example:

C Source Code→ Compiler→ Object Code
→ Linker → Executable/Firmware Image

Common firmware file formats include:

  • .hex
  • .bin
  • .elf
author avatar
MIGABO Emmanuel

MIGABO Emmanuel is an experienced Technical and Vocational Education and Training (TVET) instructor and engineering trainer with extensive experience in Electronics, Telecommunication, Computer Systems, Embedded Systems, and Information Technology. Since 2017, he has been delivering competency-based technical education and practical skills training in different educational institutions, preparing learners for careers in engineering and modern technology.

Throughout his teaching career, he has worked in various departments, including Computer Systems, Electronics and Telecommunication, Electrical Technology, and related engineering fields. He has taught learners from different academic levels using practical, project-based, and competency-based training approaches that combine theory with hands-on laboratory experience.

His teaching expertise covers a wide range of technical subjects, including:

C Programming
C++ Programming
Python Programming
Arduino IDE Programming
Embedded Systems Development
Microcontroller Programming
Electronics Fundamentals
Digital and Analog Electronics
Electrical Installation and Basic Electricity
Motherboard Design and Production
Electronic Equipment Repair and Maintenance
Enclosure Design and Production
PCB Design and Manufacturing
CCTV Camera System Installation and Configuration
Fire Detection and Alarm System Installation
Computer Hardware and Maintenance
Computer Networking Fundamentals
Sensors and Actuators
Internet of Things (IoT) Fundamentals
Technical Drawing and Engineering Documentation

In addition to classroom instruction, he has supervised numerous practical projects involving embedded systems, electronics prototyping, automation, hardware troubleshooting, and electronic product development. His training philosophy emphasizes innovation, critical thinking, problem-solving, teamwork, and industry-relevant practical skills.

He is proficient in various engineering and programming tools, including Arduino IDE, Proteus, KiCad, EasyEDA, SolidWorks, Fusion 360, and several C/C++ development environments. His interests include embedded system optimization, digital manufacturing, CAD/CAM technologies, Internet of Things (IoT), robotics, and industrial automation.

Committed to lifelong learning and professional excellence, MIGABO Emmanuel continues to develop modern training materials, competency-based curricula, and practical laboratory exercises that equip learners with the knowledge and technical skills required by today's rapidly evolving technology industry.

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