Embedded Systems - Overview


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System

A system is an arrangement in which all its unit assemble work together according to a set of rules. It can also be defined as a way of working, organizing or doing one or many tasks according to a fixed plan. For example, a watch is a time displaying system. Its components follow a set of rules to show time. If one of its parts fails, the watch will stop working. So we can say, in a system, all its subcomponents depend on each other.

Embedded System

As its name suggests, Embedded means something that is attached to another thing. An embedded system can be thought of as a computer hardware system having software embedded in it. An embedded system can be an independent system or it can be a part of a large system. An embedded system is a microcontroller or microprocessor based system which is designed to perform a specific task. For example, a fire alarm is an embedded system; it will sense only smoke.

An embedded system has three components −

  • It has hardware.

  • It has application software.

  • It has Real Time Operating system (RTOS) that supervises the application software and provide mechanism to let the processor run a process as per scheduling by following a plan to control the latencies. RTOS defines the way the system works. It sets the rules during the execution of application program. A small scale embedded system may not have RTOS.

So we can define an embedded system as a Microcontroller based, software driven, reliable, real-time control system.

Characteristics of an Embedded System

  • Single-functioned − An embedded system usually performs a specialized operation and does the same repeatedly. For example: A pager always functions as a pager.

  • Tightly constrained − All computing systems have constraints on design metrics, but those on an embedded system can be especially tight. Design metrics is a measure of an implementation's features such as its cost, size, power, and performance. It must be of a size to fit on a single chip, must perform fast enough to process data in real time and consume minimum power to extend battery life.

  • Reactive and Real time − Many embedded systems must continually react to changes in the system's environment and must compute certain results in real time without any delay. Consider an example of a car cruise controller; it continually monitors and reacts to speed and brake sensors. It must compute acceleration or de-accelerations repeatedly within a limited time; a delayed computation can result in failure to control of the car.

  • Microprocessors based − It must be microprocessor or microcontroller based.

  • Memory − It must have a memory, as its software usually embeds in ROM. It does not need any secondary memories in the computer.

  • Connected − It must have connected peripherals to connect input and output devices.

  • HW-SW systems − Software is used for more features and flexibility. Hardware is used for performance and security.

  • Embedded Systems

Advantages

  • Easily Customizable
  • Low power consumption
  • Low cost
  • Enhanced performance

Disadvantages

  • High development effort
  • Larger time to market

Basic Structure of an Embedded System

The following illustration shows the basic structure of an embedded system −

Embedded Systems Structure
  • Sensor − It measures the physical quantity and converts it to an electrical signal which can be read by an observer or by any electronic instrument like an A2D converter. A sensor stores the measured quantity to the memory.

  • A-D Converter − An analog-to-digital converter converts the analog signal sent by the sensor into a digital signal.

  • Processor & ASICs − Processors process the data to measure the output and store it to the memory.

  • D-A Converter − A digital-to-analog converter converts the digital data fed by the processor to analog data

  • Actuator − An actuator compares the output given by the D-A Converter to the actual (expected) output stored in it and stores the approved output.

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