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Chapter 9
F9-1(1)
The Usage Page item function specifies the general function of the device. In
this example, the HID device belongs to a generic desktop control.
F9-1(2)
The Collection Application groups Main items that have a common purpose
9
and may be familiar to applications. In the diagram, the group is composed of
three Input Main items. For this collection, the suggested use for the controls is
a mouse as indicated by the Usage item.
F9-1(3)
Nested collections may be used to give more details about the use of a single
control or group of controls to applications. In this example, the Collection
Physical, nested into the Collection Application, is composed of the same 3
Input items forming the Collection Application. The Collection Physical is used
for a set of data items that represent data points collected at one geometric
point. In the example, the suggested use is a pointer as indicated by the Usage
item. Here the pointer usage refers to the mouse position coordinates and the
system software will translate the mouse coordinates in movement of the
screen cursor.
F9-1(4)
Nested usage pages are also possible and give more details about a certain
aspect within the general function of the device. In this case, two Inputs items
are grouped and correspond to the buttons of the mouse. One Input item
defines the three buttons of the mouse (right, left and wheel) in terms of
number of data fields for the item ( Report Count item), size of a data field
( Report Size item) and possible values for each data field ( Usage Minimum and
Maximum , Logical Minimum and Maximum items). The other Input item is a
13-bit constant allowing the Input report data to be aligned on a byte
boundary. This Input item is used only for padding purpose.
F9-1(5)
Another nested usage page referring to a generic desktop control is defined for the
mouse position coordinates. For this usage page, the Input item describes the data
fields corresponding to the x- and y-axis as specified by the two Usage items.
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