Top Five Differences Between Layers And Tiers

Embedded systems range from simple integrated independent software to complex multi-layered ones. Understanding the architecture requires proficiency in the different layers of the software and hardware involved. It is indeed a ground for differentiation between complex broken bottleneck systems.

This article will help you get a deeper understanding, of the layers involved in making an embedded system. Further, you can learn more about the functionalities, capabilities and hardware integration with a little tip at the end of the article.

The Four Major Layers in Embedded Systems Projects

Complex systems mostly have four layers over the basic hardware layer. The layers in the embedded system work one after the other to make the functionality happen. These systems either work independently or as a part of a more extensive system. These layers are:

Hardware Abstraction Layer

The first layer is the hardware abstraction layer (HAL). It connects the software layer with the hardware, allowing them to interact. It's similar to your computer's BIOS, which initialises the computer to run the operating system.

Furthermore, the HAL allows the software layer to work independently according to the programming and call out to the hardware. In simpler terms, it will enable the software to fetch data from the board. The HAL consists mainly of the Bootloader, Board Support Packages (BSP), and Device Drivers.

In addition, it has a unique job to do in embedded systems. It allows the Operating System to work independently of the Hardware component. In other words, the operating system can work on different hardware architectures with the BSP on the HAL.

OS Layer

Over the HAL sits the Operating System that is responsible for the management of the hardware resources. However, an embedded system's OS layer differs from a computer's OS. It is optional as many embedded systems use a service or driver layer on the HAL to work independently.

The OS layer is required in complex systems to provide stability, customisation, modularity, and real-time processing. Mobility differentiates the OS layer from other OS. Embedded products are smaller, with mobility an essential characteristic. The complexity of the system defines the need for an operating system.

Some of the standard embedded OS are:

• Windows CE
• Linux
• MeeGo
• Ubuntu
• Tizen
• Android

System Service Layer

Next to the operating system is the system service layer. With this layer, the operating system can interact with the application layer. It mainly comprises file systems, a graphical user interface and a task manager that provides a direction to the operating system to work with the applications on the embedded system.

While the simple embedded systems don’t need dialogue boxes or menus, the complex one does. Therefore, the system service layer allows the complex microprocessors to work seamlessly without command lines. It is easy for the applications to work with the programming interfaces than with the command line. And Thus, the system service payer provides more significant support to the complete embedded systems, which are more complex.

Application Software Layer

This layer more or less defines the embedded systems in both complex and straightforward architectures. The functionality, capabilities, and working of the system happen around the application on the system. The most intelligent is the application layer takes commands and responds according to them. Thus, it is the brain of the complete embedded system.

The operating system works according to the need of the application software layer. It primarily works with the system service and operating system to fulfil the requirements; how the system functions depend on the software layer that keeps everything in check.

What are Tiers in Embedded Systems?

While tiers mean physical structures in a particular object or form, people often use them interchangeably with the layers. Layers are distinguishable for the codes that lay one over the other. Thus, one shouldn’t mix these two concepts, especially in Embedded Systems.

It is important to note that no books or research papers will work you through the tiers in an embedded system because you only have layers in it. Thus, you cannot define tiers in embedded systems; however, if you want to define the idea through the architecture of the microprocessors. The three overall layers of the systems might become virtual items, and the internal topping off becomes the layers. However, it is only a virtual image of the idea. As embedded systems are created over a single chip, no physical structure is stacked over the other. Hence, the embedded systems only have layers.

Conclusion

That brings the discussion of tiers and layers to an end. If you are interested in a career in embedded systems design, you can always take up an online course in the same with Skill-Lync. Also, the scope of embedded system design is vast, and therefore, a degree with comprehensive study modules in the same can help. However, you need to ensure that you take up the course only from a verified source. Also, as an enthusiast in this topic, do not forget that the system is just one unit with internally working layers at its core. These layers are software stacked over one another depending on their needs and requirements. The layers define how the system will function and, in turn, interact with each other to perform according to the conditions.

These embedded systems are complex structures that work in real-time, providing high functionality to various industries. The future scope of embedded systems in automobiles is vast. So, if you have been asking yourself, is embedded systems a good career choice?’ The answer is yes. The exciting part of these systems is their independent working in the real world. For a thriving career in embedded systems, you should learn from industry experts to get a deeper understanding of its principles, applications, design, and development. The concept of the layer is just a tiny part of the big picture of the embedded systems that are being used tremendously in automotive, satellites, computers and much more.

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