Embedded system

An Embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints.It is embedded as part of a complete device often including hardware and mechanical parts. By contrast, a general-purpose computer, such as a personal computer (PC), is designed to be flexible and to meet a wide range of end-user needs. Embedded systems control many devices in common use today.

Contain processing cores that are typically either microcontrollers or digital signal processors (DSP).The key characteristic, however, is being dedicated to handle a particular task. Since the embedded system is dedicated to specific tasks, design engineers can optimize it to reduce the size and cost of the product and increase the reliability and performance. Some Embedded systems are mass-produced, benefiting from economies of scale.

Characteristics

Gumstix Overo COM, a tiny, OMAP-based embedded computer-on-module with Wifi and Bluetooth.

1. Embedded systems are designed to do some specific task, rather than be a general-purpose computer for multiple tasks. Some also have real-time performance constraints that must be met, for reasons such as safety and usability; others may have low or no performance requirements, allowing the system hardware to be simplified to reduce costs.

2. Embedded systems are not always standalone devices. Many embedded systems consist of small, computerized parts within a larger device that serves a more general purpose. For example, the Gibson Robot Guitar features an embedded system for tuning the strings, but the overall purpose of the Robot Guitar is, of course, to play music.Similarly, an embedded system in an automobile provides a specific function as a subsystem of the car itself.

e-con Systems eSOM270 & eSOM300 Computer on Modules

3. The program instructions written for embedded systems are referred to as firmware, and are stored in read-only memory or Flash memory chips. They run with limited computer hardware resources: little memory, small or non-existent keyboard or screen.

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Peripherals

Embedded Systems talk with the outside world via peripherals, such as:

• Serial Communication Interfaces (SCI): RS-232, RS-422, RS-485 etc.
• Synchronous Serial Communication Interface: I2C, SPI, SSC and ESSI (Enhanced Synchronous Serial Interface)
• Universal Serial Bus (USB)
• Multi Media Cards (SD Cards, Compact Flash etc.)
• Networks: Ethernet, LonWorks, etc.
• Fieldbuses: CAN-Bus, LIN-Bus, PROFIBUS, etc.
• Timers: PLL(s), Capture/Compare and Time Processing Units
• Discrete IO: aka General Purpose Input/Output (GPIO)
• Analog to Digital/Digital to Analog (ADC/DAC)
• Debugging: JTAG, ISP, ICSP, BDM Port, BITP, and DP9 ports.