摘要： 提出了一种嵌入式数控系统的软硬件体系结构，该系统采用实时操作系统uCOS-II和ARM嵌入式微处理器构建。结合实时多任务操作系统的性能指标，分析了嵌入式实时操作系统uCOS-II的时间特性，并给出了uCOS-II中最长时间特性的计算方法，同时，在数控系统的平台上，测试了系统任务调度各个阶段所用时间，并对此系统的实时性和稳定性进行了分析。结果表明，基于uCOS-II和ARM所构建的嵌入式数控系统的实时性好，且具有低成本、高性能的特点，具有广泛的应用前景。

关键词: 实时操作系统, uCOS-II, ARM

Abstract: This paper discusses a hardware and software architecture of embedded numerical control system. This system is built on uCOS-II and ARM. The timing specification of uCOS-II is analyzed based on the performance of RTOS. The method for getting the longest timing specification of uCOS-II is described. And the time of system schedule is measured. The paper also analyzes the system real-time performance and stability. The result indicates that this embedded numerical control system has perfect real-time character, low cost and high-performance. It has extensive application.

Key words: Real time operation system(RTOS), uCOS-II, Advanced RISC machine(ARM)