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Chapter 9
L9-4(3)
The application provides a callback passed as a parameter. Upon completion of
the transfer, the device stack calls this callback so that the application can
finalize the transfer by analyzing the transfer result. For instance, upon read
operation completion, the application may do a certain processing with the
9
received data. Upon write completion, the application may indicate if the write
was successful and how many bytes were sent.
L9-4(4)
An argument associated to the callback can be also passed. Then in the
callback context, some private information can be retrieved.
L9-4(5)
The application provides the initialized transmit buffer.
9-4 USING THE DEMO APPLICATION
Micriμm provides a demo application that lets you test and evaluate the class
implementation. Source template files are provided for the device. Executable and source
files are provided for Windows host PC.
9-4-1 CONFIGURING PC AND DEVICE APPLICATIONS
The HID class provides two demos:
■
Mouse demo exercises Input reports sent to the host. Each report gives periodically the
current state of a simulated mouse.
■
Vendor-specific demo exercises Input and Output reports. The host sends an Output
report or receives an Input report according to your choice.
On the device side, the demo application file, app_usbd_hid.c , offering the two HID
demos is provided for μC/OS-II and μC/OS-III. It is located in these two folders:
■
\Micrium\Software\uC-USB-Device-V4\App\Device\OS\uCOS-II
■
\Micrium\Software\uC-USB-Device-V4\App\Device\OS\uCOS-III
The use of these constants usually defined in app_cfg.h allows you to use one of the HID
demos.
154
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