Displays & HMI

HEAD_UP_DISPLAY_ENABLED

What it is

Head up display (HUD) enabled

This property allows the user to turn on/off the HUD for their seat.

Each HUD in the vehicle should be assigned to the seat that is intended to use it. For example, if there is a single HUD in the vehicle that is used by the driver so that they no longer need to continuously look at the instrument cluster, then this property should be defined with a single area ID equal to the driver's seat area value.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x15200a06 apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x05000000	SEAT
Type	0x00ff0000	0x00200000	BOOLEAN
Ordinal	0x0000ffff	0x00000a06	0xa06

Reading it from an app

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

boolean value =
        mgr.getBooleanProperty(VehiclePropertyIds.HEAD_UP_DISPLAY_ENABLED, areaId);

This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.