To take the simplest case, if you kick the watchdog only from one task and that is supposed to run every 5 ms, windowing can guarantee that the system will detect a failure if the task runs every 1 ms, or every 15 ms. Some supervised entities should execute within a specified time duration. Optional reference to an OS Application. Introduction The Watchdog Manager is able to supervise the program execution abstracting from the triggering of hardware watchdog entities. This is the reference to the final Checkpoint s for this Supervised Entity. A supervised entity is meant to execute within 10ms.
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Author and wztchdog Leif Zhang. Reference to the DemEventParameter which shall be issued when the error “Monitoring has failed and a watchdog reset will occur” has occured.
Deadline Supervision monitors the time taken for the execution of a supervised entity. This is the reference to the initial Checkpoint for this Supervised Entity. The Watchdog Manager supervises the execution aktosar a configurable number of so-called Supervised Entities.
Based on the update in the local status the global status of WdgM is also updated. You need to know what ASIL you’re targeting, and then to design the system to achieve that level.
This parameter shall contain the symbolic name of the watchdog instance. Checkpoints are placed in the supervised entity. Logical supervision is used to monitor the flow of execution in the program. Oliver Scheid 88 9. Documentation for other versions of Autosar 4 solution is available too.
WdgMSupervisionReferenceCycle 1 5 Yes This parameter shall contain the amount of supervision cycles to be used as reference by the alive-supervision mechanism to perform the checkup with counted alive indications according to corresponding SE. It contains a reference to the WdgMCheckpoint that you want to be supervised, as well as a number of parameter configuring the supervision itself, i.
Watchdog Services in AUTOSAR
Sign up using Sutosar. Introduction The Watchdog Manager is able to supervise the program execution abstracting from the triggering of hardware watchdog entities. If the pre-configured Global Threshold counters exceed due to failure of the supervised entities the WdgM triggers a reset command to the Wdg driver resulting in the reset of the system.
The mode also specifies the different hardware watchdog modes i. The deadline supervision is used to supervise the time between two checkpoints. Sign up or log in Sign up using Google.
autozar This container collects all common mode-independent parameters of a Supervised Entity to be supervised by the Watchdog Manager. A supervised entity is meant to execute within 10ms.
If you merely want to check whether your ECU is alive, a simple Alive supervision 1 is probably enough. But my understanding is that window Wdg purpose is to find the system clock jitter exmple: The watchdog driver shall provide a watchdog trigger routine. Watchcog Supervision Status is the status of the individual supervised entites.
This container defines the graph of Internal Transitions within this Supervised Entity.
AUTOSAR Wdg and ISO – Stack Overflow
For example, it may have different min and max margin. The time difference between the checkpoints will give the time taken for execution of the supervised entity.
This parameter contains the amount of alive indications of the Checkpoint that are acceptable to be additional to the expected alive indications watchdoy the corresponding supervision reference cycle. When the configuring is done it is time waychdog interface the Watchdog Manager in the application or complex driver. The Watchdog Manager is able to supervise the program execution abstracting from the triggering of hardware watchdog entities.
The checkpoints and the transitions forms a program flow graph for the supervised entity. The monitored entity in the application or basic software in known as the Supervised entity. This is the reference to the initial Checkpoint s for this External Graph.
This is the reference to the source Checkpoint of a Internal Transition within this Supervised Entity. Leave a Reply Cancel reply Your email address will not be published.