Power & shutdown

AP_POWER_STATE_REQ

What it is

Property to control power state of application processor

It is assumed that AP's power state is controlled by a separate power controller.

For configuration information, VehiclePropConfig.configArray must have bit flag combining values in VehicleApPowerStateConfigFlag.

  configArray[0] : Bit flag combining values in VehicleApPowerStateConfigFlag,
                   0x0 if not used,
                   0x1 for enabling suspend to ram,
                   0x2 for supporting powering on AP from off state after timeout.
                   0x4 for enabling suspend to disk,

  int32Values[0] : VehicleApPowerStateReq enum value
  int32Values[1] : additional parameter relevant for each state,
                   0 if not used.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x11410a00 apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00410000	INT32_VEC
Ordinal	0x0000ffff	0x00000a00	0xa00

Reading it from an app

CarPropertyManager mgr = (CarPropertyManager)
        car.getCarManager(Car.PROPERTY_SERVICE);

CarPropertyValue<Integer> value =
        mgr.getProperty(VehiclePropertyIds.AP_POWER_STATE_REQ, 0);

This property is read-only — writes are rejected. It fires a callback whenever the value changes.