EmbeddedSystem-Overview.ppt

Embedded System - Overview Jianjian SONG Software Institute, Nanjing University Content What is embedded systems History and development Consistence of embedded systems Characteristics Software development overview What is an embedded system? Definition: Embedded system: any device that includes a programmable computer but is not itself a general-purpose computer. Take advantage of application characteristics to optimize the design: don’t need all the general-purpose bells and whistles. A More Detailed Definition 国内一般定义 嵌入式系统是以应用为中心，以计算机技术为基础，并且软硬件可裁剪，适用于应用系统对功能、可靠性、成本、体积、功耗有严格要求的专用计算机系统。 一般由嵌入式微处理器、外围硬件设备、嵌入式操作系统以及用户应用程序等四个部分组成，用于实现对其他设备的控制、监视或管理等功能。 Embedding a computer Examples Personal digital assistant (PDA). Cell phone. Printer. Automobile: engine, brakes, dash, etc. Television. Household appliances. PC keyboard (scans keys). mp3, mp4, etc. Reference Interpretation (1) An embedded system is any computer system or computing device that performs a dedicated function or is designed for use with a specific embedded software application. Embedded systems may use a ROM-based operating system or they may use a disk-based system, like a PC. But an embedded system is not usable as a commercially viable substitute for general purpose computers or devices. Reference Interpretation (2) A specialized computer system that is part of a larger system or machine. Typically, an embedded system is housed on a single microprocessor board with the programs stored in ROM. Virtually all appliances that have a digital interface -- watches, microwaves, VCRs, cars -- utilize embedded systems. Some embedded systems include an operating system, but many are so specialized that the entire logic can be implemented as a single program. Reference Interpretation(3) 嵌入式系统： 嵌入到对象体系中的专用计算机系统。 三个基本要素：嵌入性、专用性、计算机系统。 区分：嵌入式设备（内部有嵌入式系统的产品、设备） 按形态划分： 设备级（工控机） 板级（单板、模块） 芯片级（MCU、SoC） Content What is embedded systems History and development Consistence of embedded systems Characteristics Software dev