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Chapter 9
9-1 OVERVIEW
A HID device is composed of the following endpoints:
9
■
A pair of control IN and OUT endpoints called the default endpoint.
■
An interrupt IN endpoint.
■
An optional interrupt OUT endpoint.
Table 9-1 describes the usage of the different endpoints:
Endpoint
Control IN
Control OUT
Interrupt IN
Interrupt OUT
Direction
Device-to-host
Host-to-device
Device-to-host
Host-to-device
Usage
Standard requests for enumeration, class-specific requests, and data
communication (Input, Feature reports sent to the host with GET_REPORT
request).
Standard requests for enumeration, class-specific requests and data
communication (Output, Feature reports received from the host with
SET_REPORT request).
Data communication (Input and Feature reports).
Data communication (Output and Feature reports).
Table 9-1 HID Class Endpoints Usage
9-1-1 REPORT
A host and a HID device exchange data using reports. A report contains formatted data
giving information about controls and other physical entities of the HID device. A control is
manipulable by the user and operates an aspect of the device. For instance, a control can be
a button on a mouse or a keyboard, a switch, etc. Other entities inform the user about the
state of certain device’s features. For instance, LEDs on a keyboard notify the user about the
caps lock on, about the numeric keypad active, etc.
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