An embedded system is a special-purpose computer system that is part of a device or device. Typically, an embedded system is an embedded processor control board with a control program stored in ROM.
In fact, all devices with digital interfaces, such as watches, microwave ovens, video recorders, cars, etc., use embedded systems, and some embedded systems also contain an operating system, but most embedded systems are controlled by a single program. logic.
An embedded system generally recognized in China is defined as a dedicated computer system that is application-centric, based on computer technology, can be tailored to software and hardware, and adapts to the strict requirements of the application system on functions, reliability, cost, size, and power consumption. Which directions are embedded systems specifically used for?
Example:
Office automation: printers, copiers, fax machines
Military and aerospace products: UAVs, radars, combat robots
Home appliances: digital TV, sweeping robots, smart home appliances
Medical electronic products: biochemical analyzer, blood analyzer, CT
Automotive electronics: engine control, safety systems, car navigation and entertainment systems
Network communication products: communication switching equipment, network equipment (switches, routers, network security)
Communication and entertainment: mobile phones, digital cameras, music players, wearable electronic products, PSP game consoles
Industrial control products: industrial computers, interactive terminals (POS, ATM), security monitoring, data acquisition and transmission, instrumentation
Embedded system features
1) Tailorability. An architecture that supports openness and scalability.
2) Strong real-time performance. EOS generally has strong real-time performance and can be used in various equipment control.
3) Unified interface. Provides a unified driver interface for the device.
4) The operation is convenient and simple, providing a friendly graphical GUI and graphical interface, and pursuing easy-to-learn and easy-to-use. Provide powerful network functions, support TCP/IP protocol and other protocols, provide TCP/UDP/IP/PPP protocol support and unified MAC access layer interface, and reserve interfaces for various mobile computing devices.
5) Strong stability, weak interaction. Once the embedded system starts running, it does not require excessive user intervention, which means that EOS, which is responsible for system management, has strong stability. The user interface of the embedded operating system generally does not provide operation commands, and it provides services to the user program through the system call commands.
6) Solidify the code. In the embedded system, the embedded operating system and application software are solidified in the ROM of the embedded system computer.
7) Better hardware adaptability, that is, good portability.
8) The embedded system is organically combined with the specific application, and its upgrading is also carried out simultaneously with the specific product. Therefore, once the embedded system product enters the market, it has a long life cycle.
