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AUTOSAR从入门到精通100讲(105)-功能安全之AUTOSAR Timing的保护机制
2022-07-19 19:02:00 【格图洛书】
前言
在汽车电子ECU开发中,有一个不得不提的概念就是功能安全,对于从事汽车电子软件开发的工程师而言,功能安全等级的高低决定了设计开发ECU的水平,同时对于功能安全开发的标准ISO26262,也从各个阶段定义了汽车电子ECU开发的规范,今天所介绍的模块是一个和功能安全密切相关的模块,是ISO26262中对功能安全中的Timing的监控保护机制相关的模块。
Timing机制简介
1、ISO26262对Timing的要求
在ISO26262-6:2018的附录D中对软件层面的Freedom from interference提出了三点要求,分别是Memory、Timing和Exchange Of Information。本文重点对Timing相关的保护机制做介绍,对于Timing的要求提出了如下关注要点:
blocking of execution
deadlocks
livelocks
incorrect allocation of execution time
incorrect synchronization between software elements
针对ISO26262提出的对Timing的监控和保护,在CP AUTOSAR中主要依靠两个主要的功能块实现。分别是OS的SC4等级的时间保护机制,还有就是利用WdgM整个功能站实现对时间的监控。
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