ADAS & driver assistance

LANE_CENTERING_ASSIST_COMMAND

What it is

Lane Centering Assist (LCA) commands.

Commands to activate and suspend LCA.

When the command ACTIVATE from LaneCenteringAssistCommand is sent, LANE_CENTERING_ASSIST_STATE must be set to LaneCenteringAssistState#ACTIVATION_REQUESTED. When the ACTIVATE command succeeds, LANE_CENTERING_ASSIST_STATE must be set to LaneCenteringAssistState#ACTIVATED. When the command DEACTIVATE from LaneCenteringAssistCommand succeeds, LANE_CENTERING_ASSIST_STATE must be set to LaneCenteringAssistState#ENABLED.

For the global area ID (0), the VehicleAreaConfig#supportedEnumValues must be defined unless all enum values of LaneCenteringAssistCommand are supported.

When this property is not available because LCA is disabled (i.e. LANE_CENTERING_ASSIST_ENABLED is false), this property must return StatusCode#NOT_AVAILABLE_DISABLED. If LANE_CENTERING_ASSIST_STATE is implemented and the state is set to an ErrorState value, then this property must return a StatusCode that aligns with the ErrorState value. For example, if LANE_CENTERING_ASSIST_STATE is set to ErrorState#NOT_AVAILABLE_SPEED_LOW, then this property must return StatusCode#NOT_AVAILABLE_SPEED_LOW.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x1140100b apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00400000	INT32
Ordinal	0x0000ffff	0x0000100b	0x100b

Reading it from an app

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

mgr.setProperty(Integer.class,
        VehiclePropertyIds.LANE_CENTERING_ASSIST_COMMAND, 0, value);

This property is write-only — it cannot be read back. It fires a callback whenever the value changes.