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Chapter 12
L12-3(1)
The class instance number serves internally to the Vendor class to route the
transfer to the proper bulk OUT or IN endpoint.
L12-3(2)
Application must ensure that the buffer provided to the function is large
enough to accommodate all the data. Otherwise, synchronization issues might
happen.
L12-3(3)
The application provides a callback passed as a parameter. Upon completion of
12
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
received data. Upon write completion, the application may indicate if the write
was successful and how many bytes were sent.
L12-3(4)
An argument associated to the callback can be also passed. Then in the
callback context, some private information can be retrieved.
L12-3(5)
Application provides the initialized transmit buffer.
L12-3(6)
If this flag is set to DEF_TRUE and the transfer length is a multiple of the
endpoint maximum packet size, the device stack will send a zero-length packet
to the host to signal the end of transfer.
The use of interrupt endpoint communication functions, USBD_Vendor_IntrRdAsync() and
USBD_Vendor_IntrWrAsync() , is similar to bulk endpoint communication functions
presented in Listing 12-3.
12-3 USBDev_API
Windows application communicates with a vendor device through USBDev_API . The latter
is a wrapper developed by Micriμm allowing the application to access the WinUSB
functionalities to manage a USB device. Windows USB (WinUSB) is a generic driver for USB
devices. The WinUSB architecture consists of a kernel-mode driver ( Winusb.sys ) and a
user-mode dynamic link library ( Winusb.dll ) that exposes WinUSB functions. USBDev_API
eases the use of WinUSB by providing a comprehensive API (refer to section G-2
“USBDev_API Functions” on page 497 for the complete list). Figure 12-2 shows the
USBDev_API library and WinUSB.
214
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