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Chapter 9
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Figure 9-7 Periodic Input Reports Task
F9-7(1)
The device receives a SET_IDLE request. This request specifies an idle duration
for a given report ID. Refer to “Device Class Definition for Human Interface
Devices (HID) Version 1.11”, section 7.2.4 for more details about the SET_IDLE
request. A report ID allows you to distinguish among the different types of
reports sent over the same endpoint.
F9-7(2)
A report ID structure allocated during the HID class initialization phase is
updated with the idle duration. An idle duration counter is initialized with the
idle duration value. Then the report ID structure is inserted at the end of a
linked list containing input reports ID structures. The idle duration value is
expressed in 4-ms unit which gives a range of 4 to 1020 ms. If the idle duration
is less than the interrupt IN endpoint polling interval, the reports are generated
at the polling interval.
F9-7(3)
Every 4 ms, the periodic input report task browses the input reports ID list. For
each input report ID, the task performs one of two possible operations. The
task period matches the 4-ms unit used for the idle duration. If no SET_IDLE
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