HW_ROTARY_INPUT
What it is
Property to feed H/W rotary events to android
int32Values[0] : RotaryInputType identifying which rotary knob rotated int32Values[1] : number of detents (clicks), positive for clockwise, negative for counterclockwise int32Values[2] : target display defined in VehicleDisplay. Events not tied to specific display must be sent to VehicleDisplay#MAIN. int32values[3 .. 3 + abs(number of detents) - 2]: nanosecond deltas between pairs of consecutive detents, if the number of detents is > 1 or < -1
VehiclePropValue.timestamp: when the rotation occurred. If the number of detents is > 1 or < -1, this is when the first detent of rotation occurred.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11410a20 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00410000 | INT32_VEC |
| Ordinal | 0x0000ffff | 0x00000a20 | 0xa20 |
Reading it from an app
This property is defined in the HAL but is not exposed as a constant in android.car.VehiclePropertyIds, so it is not reachable through CarPropertyManager from an ordinary app. It is used by the platform, or by vendor code running with system privileges.