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Using the Demo Application
F12-3(2)
On the device side, the Echo Sync uses a task that complements the Windows
application execution. Each step is done synchronously. The read and write
operation is the opposite of the host side in terms of USB transfer direction.
Read operation implies a bulk OUT endpoint while a write implies a bulk IN
endpoint.
F12-3(3)
If the Echo Async is enabled, the same steps done by the Sync task is replicated
but using the asynchronous API. A task is responsible to start the first
asynchronous OUT transfer to receive the header. The task is also used in case
of error during the protocol communication. The callback associated to the
header reception is called by the device stack. It prepares the next
asynchronous OUT transfer to receive the payload. The read payload callback
sends back the payload to the host via an asynchronous IN transfer. The write
payload callback is called and either prepares the next header reception if the
entire payload has been sent to the host or prepares a next OUT transfer to
receive a new chunk of data payload.
12
Upon the first connection of the vendor device, Windows enumerates the device by
retrieving the standard descriptors. Since Microsoft does not provide any specific driver for
the Vendor class, you have to indicate to Windows which driver to load using an INF file
(refer to section 3-1-1 “About INF Files” on page 46 to for more details about INF). The INF
file tells Windows to load the WinUSB generic driver (provided by Microsoft). Indicating the
INF file to Windows has to be done only once. Windows will then automatically recognize
the vendor device and load the proper driver for any new connection. The process of
indicating the INF file may vary according to the Windows operating system version:
■
Windows XP directly opens the “Found New Hardware Wizard”. Follow the different
steps of the wizard until the page where you can indicate the path of the INF file.
■
Windows Vista and later won’t open a “Found New Hardware Wizard”. It will just
indicate that no driver was found for the vendor device. You have to manually open the
wizard. Open the Device Manager, the vendor device connected appears under the
category ‘Other Devices’ with a yellow icon. Right-click on your device and choose
‘Update Driver Software...’ to open the wizard. Follow the different steps of the wizard
until the page where you can indicate the path of the INF file.
225
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