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Chapter 12
L12-6(1)
The pipe handle gotten with USBDev_BulkIn_Open() is passed to the function
to schedule the transfer for the desired pipe.
L12-6(2)
The application provides a receive buffer to store the data sent by the device.
L12-6(3)
The application provides a callback passed as a parameter. Upon completion of
the transfer, USBDev_API calls this callback so that the application can finalize
the transfer by analyzing the transfer result. For instance, upon read operation
12
completion, the application may do a certain processing with the received data.
L12-6(4)
An argument associated to the callback can be also passed. Then in the
callback context, some private information can be retrieved.
12-4 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.
12-4-1 CONFIGURING PC AND DEVICE APPLICATIONS
The demo used between the host and the device is the Echo demo. This demo implements
a simple protocol allowing the device to echo the data sent by the host.
On the device side, the demo application file, app_usbd_vendor.c , provided for μC/OS-II
and μC/OS-III 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
app_usbd_vendor.c contains the Echo demo available in two versions:
■
The Echo Sync demo exercises the synchronous communication API described in
section 12-2-4 “Synchronous Communication” on page 211.
■
The Echo Async demo exercises the asynchronous communication API described in
section 12-2-5 “Asynchronous Communication” on page 212.
220
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