AUTOSAR from getting started to mastering 100 lectures (105) - protection mechanism of AUTOSAR timing for functional safety

Preface

In car electronics ECU In development , One concept that has to be mentioned is functional safety , For engineers engaged in automotive electronic software development , The level of functional safety determines the design and development ECU The level of , At the same time, the standards for functional safety development ISO26262, It also defines automotive electronics from various stages ECU Development specifications , The module introduced today is a module closely related to functional safety , yes ISO26262 Medium to function safety Timing Monitoring and protection mechanism related modules .

 Timing Mechanism introduction

1、ISO26262 Yes Timing The requirements of

stay ISO26262-6:2018 The appendix D On the software level Freedom from interference Three requirements are put forward , Namely Memory、Timing and Exchange Of Information. This paper focuses on the Timing Introduce the relevant protection mechanism , about Timing The following points of concern are raised in the requirements of ：

• blocking of execution

• deadlocks

• livelocks

• incorrect allocation of execution time

• incorrect synchronization between software elements

in the light of ISO26262 Proposed right Timing Monitoring and protection of , stay CP AUTOSAR It mainly relies on two main function blocks . Namely OS Of SC4 Hierarchical time protection mechanism , And use WdgM The whole function station realizes the monitoring of time .