关键词: UML, 实时嵌入式系统, 面向对象, 数据流

Abstract: Along with the functions of real-time embedded systems becoming more and more complex, and the market press becoming pricking up, the design of real-time embedded systems needs modern software engineering methodologies. Rather recently, using UML in real time domains becomes a hot topic. Real-time embedded systems usually are compositions of event-driven discrete systems and dataflow-based continuous systems. But the extensions of UML for real-time domains (UML-RT) only support event-driven systems modeling. This paper first analysed the advantages and problems of using UML in real time systems design. Second, it discussed UML-RT based real-time embedded systems design methodology and proposed an extension of UML-RT to support Dataflow modeling. Finally, this paper presented an automobile cruise control system as an example to illuminate this methodology.

Key words: UML, real-time embedded system, object-oriented, dataflow