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It specifies two checkpoints and the expected time between this two checkpoints. The Watchdog Manager supervises the execution of a configurable number of so-called Supervised Entities. The flow of execution is monitored by monitoring these checkpoints. This is the reference to the final Checkpoint s for this Supervised Entity.
Watchdog Services in AUTOSAR
This ensures minimum timing jitter. The code of supervised entities calls the Watchdog Manager when they have reached a checkpoint. However, if you need to supervise several components, then you also need to define several Supervised Entities, i.
After the final checkpoint it is expected that the initial checkpoint is reported again. Alive supervision — for supervision of timing of periodic software.
Comment Name Email Website. Any sequence starting in an initial checkpoint autoxar finishing in a final checkpoint is correct assuming that the checkpoints belong to the same graph.
Typically, you’d rely not just on ISO but also on a safety manual provided by the manufacturer of your hardware. Once again, you need to decide how autosat supervised entities your project requires, for a simple Alive Supervision where you only have one component that periodically triggers the Watchdog, you will likely only use one SupervisedEntity.
This container collects all common mode-independent parameters of a Supervised Entity to be supervised by the Watchdog Manager. Email Required, but never shown. If this is obeyed, ISO is not satisfied.
This is the reference to the Supervised Entity for which the Local Status watchhdog are specified. Documentation for other versions of Autosar 4 solution is available too. The modes usually corresponds to autoear modes where only the active parts of the application is supervised.
The watchdog driver shall provide a watchdog trigger routine. This is the core of the WdgM Supervised Entity configuration. Wtchdog routine servicing an internal watchdog shall be implemented as an interrupt routine driven by a hardware timer.
It is possible to configure different modes to the Watchdog manager. This is the reference to the initial Checkpoint s for this External Graph.
This container collects all configuration parameters for Logical Supervision for one external graph. This parameter contains the watchdog mode that shall be used for the referenced watchdog in this Watchdog Manager mode.
Integrating the WdgM Supervision When the configuring is done it is time to interface the Watchdog Manager in the application or complex driver. Introduction The Watchdog Manager is able to supervise the program execution abstracting from the triggering of hardware watchdog entities. WdgMMinMargin 1 1 Yes Autozar parameter contains the amount of alive indications of the Checkpoint that are acceptable to be missed from the expected alive indications within the corresponding supervision reference cycle.
This container describes one of multiple configuration watchdoy of WdgM. This parameter shall contain the symbolic name of the watchdog instance. The two entities have alive supervision in the WatchdogOn mode and no supervision in WatchdogOff. For supervision of the correctness of the execution sequence, i.
Documentation for other versions of Autosar 4 solution is available too. When the configuring is done it is wwatchdog to interface the Watchdog Manager in the application or augosar driver. Author and commenters Leif Zhang.