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Commit 90a29284 authored by Eric Jeong's avatar Eric Jeong
Browse files

Add explanation to VHAL_HEARTBEAT property 

Bug: 168132371
Test: build okay
Change-Id: I0755779b09ba830fae9f4017306740ec05b2f949
parent 8fa716a7

automotive/vehicle/2.0/types.hal

+8 −5
Original line number Diff line number Diff line
@@ -2924,11 +2924,14 @@ enum VehicleProperty : int32_t { 
        | VehicleArea:GLOBAL),



    /**

     * Defines an event that VHAL signals to the car watchdog as a heartbeat.

     *

     * VHAL is supposed to write system uptime to this property at every 3 second.

     * Car watchdog subscribes to this property and checks if the property is updated at every 3

     * second. If it isn’t, car watchdog considers VHAL unhealthy and terminates it.

     * Defines an event that VHAL signals to car watchdog as a heartbeat.

     *

     * If VHAL supports this property, VHAL should write system uptime to this property at every 3

     * second. Car watchdog subscribes to this property and checks if the property is updated at

     * every 3 second. With the buffer time of 3 second, car watchdog waits for a heart beat to be

     * signaled up to 6 seconds from the last heart beat. If it isn’t, car watchdog considers

     * VHAL unhealthy and terminates it.

     * If this property is not supported by VHAL, car watchdog doesn't check VHAL health status.

     *

     * @change_mode VehiclePropertyChangeMode:ON_CHANGE

     * @access VehiclePropertyAccess:READ