OSEK/VDX标准的车载嵌入式操作系统内核的结构与设计方法

STRUCTURE AND DESIGN METHOD OF ON-BOARD EMBEDDED OPERATION SYSTEM BASED ON OSEK/VDX STANDARDS

OSEK/VDX标准在汽车电子领域有着广泛的应用。该标准仅仅规定了OSEK操作系统的系统行为以及相关接口功能,并未涉及其具体实现,因此研究基于OSEK标准的嵌入式操作系统结构与设计方法有着重要意义。在深入分析OSEK操作系统标准的基础上,给出了基于OSEK操作系统标准的车载嵌入式操作系统内核OSEKernel的结构。介绍OSEKernel中ECC2和BCC2一致类的任务调度、警报与计数器、第二类中断的设计方法,以及降低RAM消耗的任务堆栈优化方法,最终在x86平台下实现了OS-EKernel的原型。

OSEK/VDX standard is widely used in automotive electronics area, the standard only defines the system behaviours and corresponding function interfaces of OSEK operation system, but the specific implementation of OSEK operation system is not addressed, so it has the significance to research the structure and design method of the embedded operation system based on OSEK standard. In this paper we elab- orately analyzed OSEK operation system standard, and then introduced the structure of OSEKeruel based on it which is the kernel of on-board embedded operation system. This paper also introduces the conformance class design methods of task scheduling, alarm and counter, ISR2 of ECC2 and BCC2 in OSEKernel, and the way to optimise task stack for limiting RAM usage. Finally we implemented the prototype of OSEKernl on x86 platform.