All You Need to Know About Embedded Systems Programming

Living side by side with smart devices has been a convenient and comfortable practice for all of us for quite a long time. But what do we know about modern washing machines or coffee makers apart from which buttons to push? Not much. Their sophisticated performance remains invisible to ordinary users because hardly anyone looks inside these machines.

In today’s article, we are going to look under the hood and find out what’s responsible for the workings of everyday appliances. Our big buzz topic is embedded software development and its undeniable influence on various domains.

What Is an Embedded System?

While a general-purpose computer traditionally performs a diversity of functions, has a screen and a keyboard, and connects to the internet, an embedded system works and may look entirely different.

An embedded system is a small or large non-computer device with integrated software based on microcontrollers and microprocessors for performing a special function or a limited set of functions. It may or may not have a screen and a keyboard, be either programmable or non-programmable, perform a single function in isolation or work as a part of a large system.

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From a TV remote control and a microwave oven to a network of sensors in automobiles and complicated manufacturing robotic equipment, embedded software engineering is present in all of these devices and electronics.

Common Features of Embedded Systems

  • Designed to perform specific repeated functions on certain single-purpose devices
  • Should perform their functions quickly, within a prescribed timeframe
  • Based on microprocessors and microcontrollers
  • May work without operating systems or use special OSs, quite often real-time operating systems (RTOS)
  • Work with limited memory, power and computing resources
  • May or may not have a keyboard, screen, user interface, connectivity
  • May be created with consideration to external factors such as temperature, humidity and other environmental conditions that may affect device performance

Firmware vs. Embedded Software vs. IoT

The three terms — firmwareembedded software and the Internet of Things (IoT) — are different concepts, although they are tightly interconnected and, consequently, are often confused with each other. Let’s clarify their definitions and how they differ from one another.

Firmware is a program instruction written into the memory of a particular single-purpose electronic device and performing low-level functions such as converting sensor signals. It is written in low-level languages (C or assembly) and then translated into the machine code so that the hardware of a given device can read this code and execute it.

Earlier, this type of software used to be stored in EPROM (erasable programmable read-only memory) chips, and it was hard or even impossible to reprogram or update the firmware. Today, it is more often stored in flash memory, so it can be much easily updated.

Usually, the firmware doesn’t need to be updated, as it is a permanent program for consumer appliances (e.g. refrigerators, ovens), computer components (e.g. video adapters, hard drives) and peripherals (e.g. printers, scanners).

Embedded software, just like firmware, is created for a particular device. The difference is that, being written in high-level languages Java, C++ or Python, embedded software is more sophisticated and performs high-level functions such as data processing and interaction with other devices.

While firmware can handle tasks without operating systems, embedded software requires a special OS.

The program files for embedded software are stored in the file system of a given device and extracted to the random-access memory (RAM) for execution.

If you connect an embedded system to the internet, it turns into an IoT device. Thus, the Internet of Things consists of a range of physical objects with integrated software and network connection that can be controlled and updated remotely.

With the rapid pace of IoT development, practically any object can become a connected device.

Read also: IoT and Smart Manufacturing Drive the Fourth IndustrialRevolution

Applications of Embedded Systems

There is no need to look far and wide to discover real-life use cases of embedded systems; they are all around.

Smart Home

Modern houses are full of consumer electronic devices and household appliances, such as TV and music systems, digital cameras, smartphones, gaming consoles, air conditioners, fridges, coffee machines and vacuum-cleaning robots, all of which are vivid examples of embedded software usage.

As soon as such devices became internet-enabled and users got a chance to manage them at a distance through wireless connectivity, the concept of smart home emerged.

Smart Cities

Multiple electronic devices and IoT systems are being used in various cities around the globe. Merging into extensive smart networks, they create a new ecosystem named “smart city” solely for the purpose of supporting security and streamlining processes in large areas where millions of people reside.

Embedded technology forms the basis for smart parking, surveillance systems, traffic control systems, pollution monitoring solutions, interactive kiosks and various community services.

Medicine

Nowadays, the use of embedded systems in healthcare is ubiquitous. A variety of wearable devices and diagnostic systems allow for monitoring patient health, as well as collecting, storing and analyzing data.

Read also: The Importance of Data Collection in Healthcare

From a simple electronic thermometer to the more complicated ECG and MRI machines, anywhere in medical equipment, you can find specific built-in programs working for the benefit of doctors and patients.

Automotive Industry

A modern car is literally packed with embedded systems onboard. Here are some examples:

  • Anti-lock braking systems, automatic transmission, blindspot detection, cruise control and a number of sensors are designed to make car movement safer and to prevent accidents
  • Fuel control systems monitor fuel consumption
  • Emission control technology is designed to reduce air pollution
  • Heated seats, climate control, in-vehicle infotainment systems make driving comfortable

Thus, the core purpose of embedded software in cars is to provide safe, comfortable, cost-effective and ecologically friendly driving.

Read also: IoT in Automotive Industry

Manufacturing

One of the biggest industries in the world, manufacturing, has been highly affected by the introduction of technological innovations including embedded software for quite some time now. Today, we can call it smart manufacturing due to the active implementation of robotics, IoT, AI and Big Data into production processes.

Dozens of devices, from small-sized sensors to large sophisticated units, can be found at any factory. Their functions vary from online monitoring and remote control of manufacturing equipment to data collection and replacing people on the assembly line.

Aerospace and Military

The role of high-performance sensors, navigation and communication solutions is critical in aviation, space industry and military activities. Actually, embedded and IoT solutions are the essentials in this industry because they are the ones responsible for planes taking off and landing and satellites circling the Earth while sending and receiving signals.

Best Languages and OS for Embedded Systems Programming

Built-in systems, which significantly differ from general computer-based programs, require a wide range of tools and operating systems for programming and operation.

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C and C++ languages have been traditionally popular for developing software embedded into a hardware chip. Their core benefits are speed, the ability to access low-level system components and little memory consumed by the compiled programs.

C# is derived from the C family as a combination of object-oriented and structured programming. It is also a good option for embedded and IoT solutions because programs written in C# can be compatible with different architectures.

Assembly language is widely used for low-resource systems as it directly translates code into machine code, which hardware can easily interpret. The language is fast and memory-efficient.

One of the most popular languages for desktop software, Java is used to create outstanding programs for embedded systems as well. Leveraging its powerful libraries and the Java Virtual Machine (JWM), developers can write portable applications compatible with different types of hardware.

In recent years, an interpreted language Python has been gaining momentum as the tool for computer science and embedded computing. It is concise and readable, which streamlines the app development process. Leveraging artificial intelligence algorithms, Python can gather, store and analyze tons of data from real-time embedded systems.

The list of suitable languages can be continued with JavaScript, Golang, Rust, Ada, Lua, Verilog, Embedded C++ and more.

Read also: Top Ten Embedded Software Development Tools

As far as operating systems are concerned, there are plenty of appropriate options. Windows CE plays a significant role in powering various built-in systems as it was specifically designed for handling industrial controllers and automobile computers. However, it is becoming obsolete, and you might consider replacing it with Windows 10 IoT.

The open-source Linux is a traditional OS for smart appliances, just like Android for mobile devices. We can also name a real-time operating system (RTOS) ThreadX among the highly popular solutions for managing smart objects.

Benefits of Embedded Systems

  • Strong performance — since software is written for handling a single task on a certain device, its performance is usually close to perfect, which is crucial for end-users
  • Small size — in comparison with regular computers, embedded systems are much smaller in size, which makes them compact, portable and convenient for mass production
  • Low power consumption — most devices require little power for operations, which means that they can be applied in various locations and work in complicated circumstances; it also means resource usage optimization.

Challenges of Embedded Software Development

In many cases, embedded systems are responsible for critical processes and even for human lives. That’s why developers should address certain challenges while creating built-in solutions in order to provide their irreproachable performance.

Stability

Real-time response and stable behavior of the equipment under all circumstances are in many cases lifesaving, and developers are in charge of this functionality. They must design programs in such a way that devices work in a stable fashion within the prescribed resources and regardless of the changing environments.

Design Constraints

According to market demands, devices should become smaller but more powerful. For software engineers, it is an increasingly complicated task — to pack more computing capabilities into a smaller piece of hardware.

Security

In the digital world where any object connected to the internet can be exposed to cyberattacks, the security of personal data has become a hot issue. Embedded security is among the greatest challenges for developers as more strict requirements are imposed regarding the QA and testing expertise, as well as the security mechanisms for protecting built-in solutions.

Living Under the Control of Devices

Is it a change for better or worse to live in a world in which devices know more about you than you yourself do and where machines can control practically everything? We don’t know the answer, but we know that progress can’t be stopped. We should adapt to the new reality.

If you need a consultation for your embedded project, SaM Solutions’ highly experienced specialists are available to discuss it with you.

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About the author

Natallia Sakovich
Natallia Sakovich

A copywriter at SaM Solutions, Natallia is devoted to her motto — to write simply and clearly about complicated things. Backed up with a 5-year experience in copywriting, she creates informative but exciting articles on high technologies.