Hid Global Driver



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There are three categories of HID APIs: device discovery and setup, data movement, and report creation/interpretation.

Device Discovery and Setup

These HID APIs are used to identify the properties of a HID device and to establish communication with that device. Applications use these APIs to identify a Top Level Collection.

Data Movement

These HID APIs are used to move data between an application and a selected device. Drivers check point.

Report Creation and Interpretation

Developers of custom hardware know the size and format of each Report issued by their device. In this case the application can cast the input and output Report buffers to structs and consume the data.

Developers of HID applications intended to communicate with all devices that expose common functionality (for example a music application that must detect when a play button is pressed) may not know the size and format of the HID Reports. This category of application understands certain Top Level Collections and certain usages.

To interpret the Reports received from a device or to create Reports to be sent the application must leverage the Report Descriptor to determine if and where a particular Usage is located in the Reports and (potentially) the units of values in the Reports. In these cases HID parsing is required. Windows provides a HID parser for use by drivers and applications via APIs (HidP_*) that can be used to discover the types of usages supported by a device, determine the state of such usages in a Report, or to build a Report to change the state of a usage in the device.

These are the HID parser APIs.

HID Related Specifications and Tools

Device Class Definition HID

The Device Class Definition for HID 1.11 is intended to supplement the USB Specification and provide HID manufacturers with the information necessary to build USB-compatible devices. It also specifies how the HID class driver should extract data from USB devices. The primary and underlying goals of the HID class definition are to:

  • be as compact as possible to save device data space
  • allow the software application to skip unknown information
  • be extensible and robust
  • support nesting and collections
  • be self-describing to allow generic software applications

HID Usage Tables

The HID Usage Tables 1.21 document defines constants that can be interpreted by an application to identify the purpose and meaning of a data field in a HID report.

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Usages are also used to define the meaning of groups of related data items. This is accomplished by the hierarchical assignment of usage information to collections.

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Usages identify the purpose of a collection and the items it contains. Each Input, Output, Feature, and/or Collection data item within a Collection item can be assigned a purpose with its own usage item. Usages assigned to a collection apply to the items within the collection.

The HID Usage Tables document contains extensions to the tables defined in the USB Device Class Definition for Human Interface Devices. All usages pages, except the Keyboard table, are replicated in the Usage Table document. The Usage Table document identifies the extensions to the Keyboard usage table.

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Note: For keyboards, look at the usage table sections in both the HID Specification and the HID Usage Table document!

Approved Usage Table Review Requests

The following HID Usage Table Review Requests have been approved for implementation by the USB Device Working Group HID Committee. These Review requests assign enumeration values and recommended meaning to new Usages allocated after the publication of the HID Usage Tables v1.21. Please note that the creation of a new Usage does not imply support for that Usage by any USB HID Host vendor. Integrated Usage Table Review Requests.

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Review Request 99: Voice Dictation Usage64.26 KB