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Overview
After analyzing the previous mouse Report descriptor content, the host’s HID parser is able
to interpret the Input report data sent by the device with an interrupt IN transfer or in
response to a GET_REPORT request. The Input report data corresponding to the mouse
Report descriptor shown in Figure 9-1 is presented in Table 9-3. The total size of the report
data is 4 bytes. Different types of reports may be sent over the same endpoint. For the
9
purpose of distinguishing the different types of reports, a 1-byte report ID prefix is added to
the data report. If a report ID was used in the example of the mouse report, the total size of
the report data would be 5 bytes.
Bit offset
0
1
2
3
16
24
Bit count
1
1
1
13
8
8
Description
Button 1 (left button).
Button 2 (right button).
Button 3 (wheel button).
Not used.
Position on axis X.
Position on axis Y.
Table 9-3 Input Report Sent to Host and Corresponding to the State of a 3-Buttons Mouse.
A Physical descriptor indicates the part or parts of the body intended to activate a control or
controls. An application may use this information to assign a functionality to the control of a
device. A Physical descriptor is an optional class-specific descriptor and most devices have
little gain for using it. Refer to “Device Class Definition for Human Interface Devices (HID)
Version 1.11” section 6.2.3 for more details about this descriptor.
141
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