TIRE_PRESSURE_DISPLAY_UNITS
What it is
Tire pressure units for display
Indicates which units the car is using to display tire pressure to the user. Eg. PSI, Bar or Kilopascal.
VehiclePropConfig.configArray is used to indicate the supported pressure display units. Pressure units are defined in VehicleUnit. For example: configArray[0] = KILOPASCAL configArray[1] = PSI configArray[2] = BAR
If updating TIRE_PRESSURE_DISPLAY_UNITS affects the values of other *_DISPLAY_UNITS properties, then their values must be updated and communicated to the AAOS framework as well.
This property is defined as VehiclePropertyAccess.READ_WRITE, but OEMs have the option to implement it as VehiclePropertyAccess.READ only.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11400602 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00400000 | INT32 |
| Ordinal | 0x0000ffff | 0x00000602 | 0x602 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
int value =
mgr.getIntProperty(VehiclePropertyIds.TIRE_PRESSURE_DISPLAY_UNITS, 0);This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.