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Configuration
interval of 2 is ignored by the class. The structure App_USBD_HID_Callback is
also passed and references 4 application callbacks which will be called by the
HID class upon processing of the class-specific requests.
L9-1(3)
There are 4 application callbacks for class-specific requests processing. There is
9
one callback for each of the following requests: GET_REPORT , SET_REPORT ,
GET_PROTOCOL and SET_PROTOCOL . Refer to “Device Class Definition for
Human Interface Devices (HID) Version 1.11”, section 7.2 for more details
about these class-specific requests.
L9-1(4)
Check if the high-speed configuration is active and proceed to add the HID
instance previously created to this configuration.
L9-1(5)
Check if the full-speed configuration is active and proceed to add the HID
instance to this configuration.
Listing 9-1 also illustrates an example of multiple configurations. The functions
USBD_HID_Add() and USBD_HID_CfgAdd() allow you to create multiple configurations and
multiple instances architecture. Refer to section Table 7-1 “Constants and Functions Related
to the Concept of Multiple Class Instances” on page 99 for more details about multiple class
instances.
Listing 9-2 presents an example of table declaration defining a Report descriptor
corresponding to a mouse. The example matches the mouse report descriptor viewed by
the host HID parser in Figure 9-1. The mouse report represents an Input report. Refer to
section 9-1-1 “Report” on page 136 for more details about the Report descriptor format. The
items inside a collection are intentionally indented for code clarity.
147
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