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Chapter 7
L7-7(8)
Ask the class for the total size of endpoint class-specific descriptors.
7
L7-7(9)
Ask the class to process a standard request whose recipient is an interface.
L7-7(10)
Ask the class to process a class-specific request.
L7-7(11)
Ask the class to process a vendor-specific request.
A class is not required to provide all the callbacks. If a class for instance does not define
alternate interface settings and does not process any vendor requests, the corresponding
function pointer will be a null-pointer. Listing 7-8 presents the callback structure for that case.
static USBD_CLASS_DRV USBD_XXXX_Drv = {
USBD_XXXX_Conn,
USBD_XXXX_Disconn,
0,
USBD_XXXX_UpdateEPState,
USBD_XXXX_IFDesc,
USBD_XXXX_IFDescGetSize,
USBD_XXXX_EPDesc,
USBD_XXXX_EPDescGetSize,
USBD_XXXX_IFReq,
USBD_XXXX_ClassReq,
0
};
Listing 7-8 Class Callback Structure with Null Function Pointers
If a class is composed of one interface then one class callback structure is required. If a
class is composed of several interfaces then the class may define several class callback
structures. In that case, a callback structure may be linked to one or several interfaces. For
instance, the Communication Device Class (CDC) is composed of one Communication
Interface and one or more Data Interfaces. The Communication interface will be linked to a
callback structure. The Data interfaces may be linked to another callback structure common
to all Data interfaces.
The class callbacks are called by the core task when receiving a request from the host sent
over control endpoints (refer to section 4-2 “Task Model” on page 58 for more details on the
core task). Table 7-2 indicates which callbacks are mandatory and optional and upon
reception of which request the core task calls a specific callback.
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