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Using the Demo Application
F9-3(1)
On the device side, the task App_USBD_HID_MouseTask() simulates a mouse
movement by setting the coordinates X and Y to a certain value and by sending
the Input report that contains these coordinates. The Input report is sent by
calling the USBD_HID_Wr() function through the interrupt IN endpoint. The
mouse demo does not simulate any button clicks; only mouse movement.
9
F9-3(2)
The host Windows PC polls the HID device periodically following the polling
interval of the interrupt IN endpoint. The polling interval is specified in the
Endpoint descriptor matching to the interrupt IN endpoint. The host receives
and interprets the Input report content. The simulated mouse movement is
translated into a movement of the screen cursor. While the device side
application is running, the screen cursor moves endlessly.
The vendor-specific demo requires you to launch a Windows executable. Two executables
are already provided in the following folder:
■
\Micrium\Software\uC-USB-Device-V4\App\Host\OS\Windows\HID\Visual Studio 2010\exe
The two executables have been generated with a Visual Studio 2010 project available in
\Micrium\Software\uC-USB-Device-V4\App\Host\OS\Windows\HID\Visual Studio 2010 .
■
HID - Control.exe for the vendor-specific demo utilizing the control endpoints to send
Output reports or receive Input reports.
■
HID - Interrupt.exe for the vendor-specific demo utilizing the interrupt endpoints to
send Output reports or receive Input reports.
Figure 9-4 presents the vendor-specific demo with the host and device interactions:
157
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