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Chapter 8. HAVi > Graphic User Interface

8.5. Graphic User Interface

The primary goal of the HAVi user interface is to offer users an easy to use operating environment. The HAVi architecture allows users to control devices through familiar means, such as via the front panel or via the buttons of a remote controller. In addition, the HAVi architecture allows device manufacturers to specify GUIs that can be rendered on a range of displays varying from text-only to high-level graphical displays. The GUI need not appear on the device itself, it may be displayed on another device and the display device may potentially be from another manufacturer.

8.5.1. Level 1 GUI

The Level 1 GUI, called the DDI, is intended for IAVs. DDI elements can be loaded from a DDI target, typically a DCM, and displayed by a DDI controller. The DDI controller retrieves the DDI elements via the DCM rather than directly from the SDD data, so it is possible that the DCM itself is the source of DDI elements. The DDI controller generates HAVi messages in response to user input, and it also responds to HAVi messages sent by the DCM as a result of changes in device state. This communication is called the DDI protocol.


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