HID Usage Tables Document 1.1 - C. Scott Ananian

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90 Universal Serial Bus HID Usage TablesThe Preferred flag is set because the control will return to the center position when the user releases it.A.3 Radio ButtonsRadio buttons are a group of mutually exclusive buttons. In this example, an audio receiver uses three radiobuttons to select between a computer, a DVD device, or the World Wide Web as a display source.A.3.1 Mechanically Linked Radio ButtonsTraditionally, radio button implementations have had a mechanical system that releases any buttons notpressed and holds the last pressed button in an active state until another button is pressed. In the examplebelow, one of three values will be returned: Media Select Computer, Media Select DVD, or Media SelectWEB.Logical Minimum(1), Logical Maximum(3),UsagePage(Consumer),Usage(Media Select Computer),Usage(Media Select DVD),Usage(Media Select WWW),ReportSize(2), ReportCount(1),Input(Data, Array, Absolute, No Wrap, Linear, No Preferred, No Null Position)The No Preferred flag is set because the report will always present the value of the last button pressed. TheNo Null Position flag indicates that there is never a state in which the control is not sending meaningful data.The returned values are 1 = Media Select Computer, 2 = Media Select DVD, or 3 = Media Select WWW.A.3.2 Radio Buttons with No Mechanical LinkageMany systems today use a separate display to indicate the current selection and there is no mechanicalconnection between the buttons. In this example, the control will return one of four values: Null (a valueoutside of the Logical Minimum and Logical Maximum range), Media Select Computer, Media SelectDVD, or Media Select WWW.Logical Minimum(1), Logical Maximum(3),UsagePage(Consumer),Usage(Media Select Computer),Usage(Media Select DVD),Usage(Media Select WWW),ReportSize(2), ReportCount(1),Input(Data, Array, Absolute, No Wrap, Linear, No Preferred, Null Position)The No Preferred flag is set because a valid selection is presented only as long as the user is pressing abutton. When the user releases a button, the report will present a Null value. The Null Position flag indicatesthat there is a state in which the control is not sending meaningful data and that an application can expect aNull value which should be ignored. A Report Size of 2 declares a 2-bit field where only four possiblevalues can be returned: 0 = Null, 1 = Media Select Computer, 2 = Media Select DVD, or 3 = Media SelectWWW.A.4 Named Array FieldTo simplify an application finding a “one of many” set of controls, the array field associated with it can benamed by wrapping the array declaration in a logical collection.Version 1.1 April 8, 1999
Universal Serial Bus HID Usage Tables 91In the following example, the device returns one of three status codes: Not Ready, Ready, or Err Not aloadable character. An application can simply query for the Display Status usage to find the array field thatwill contain the status codes.ReportSize(2), ReportCount(1),Logical Maximum(2),Usage(Display Status),Collection(Logical),Usage(Stat Not Ready),Usage(Stat Ready),Usage(Err Not a loadable character),Input(Data, Array, Absolute, No Null Position), ; 3-bit status fieldEnd Collection(),The No Null Position flag indicates that there is never a state in which it is not sending meaningful data. Thereturned values are Null = No event (outside of the Logical Minimum / Logical Maximum range) 1 = StatNot Ready, 2 = Stat Ready, or 3 = Err Not a loadable character.A.5 Multiple Instances of a ControlThis example shows how to implement multiple instances of a set of controls by defining a device with twopointers, each with X and Y axes. An application looking for Pointer usages would find two of each typeenumerated.UsagePage(Generic Desktop),Usage(Pointer),; PointerCollection(Logical),UsagePage(Ordinal),Usage(Instance 1), ; Pointer 1Collection(Physical),UsagePage(Generic Desktop),Usage(X-axis),Usage(Y-axis),Collection End,UsagePage(Ordinal),Usage(Instance 2), ; Pointer 2Collection(Physical),UsagePage(Generic Desktop),Usage(X-axis),Usage(Y-axis),Collection End,Collection End,A.6 Multiple Instances of a Multi-Mode LEDThis example shows how to implement an indicator that supports blinking as well as multiple colors. In thisexample, there are two LEDs (Play and Stop) that can be On, Blinking, or Off, and when they areilluminated they can be Red, Green, or Amber. The LED page provides slow and fast blinking usages, andeither could have been chosen here to enable the single blinking mode that this device supports.Declare the globals that are used by all the Main items.Report Size(2),Report Count(1),Logical Minimum(1),Version 1.1 April 8, 1999
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HID Usage Tables Document 1.1 - C. Scott Ananian

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