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Chapter 7
You can refer to section 5-4 “Configuration Examples” on page 71 for some configuration
7
examples showing multiple class instances applied to composite devices. Composite
devices uses at least two different classes provided by the μC/USB-Device stack. The section
5-4-2 “Composite High-Speed USB device” on page 73 gives a concrete example based on
Figure 7-2. See section 5-4-3 “Complex Composite High-Speed USB device” on page 74 for
a hybrid example that corresponds to Figure 7-2 and Figure 7-3.
7-2 CLASS INSTANCE STRUCTURES
When a class instance is created, a control structure is allocated and associated to a specific
class instance. The class uses this control structure for its internal operations. All the
Micriμm USB classes define a class control structure data type. Listing 7-5 shows the
structure declaration with the common fields.
struct usbd_xxxx_ctrl {
CPU_INT08U DevNbr;
CPU_INT08U ClassNbr;
USBD_XXXX_STATE State;
USBD_XXXX_COMM *CommPtr;
...
(1)
(2)
(3)
(4)
(5)
};
Listing 7-5 Class Instance Control Structure
L7-5(1)
The device number to which the class instance is associated with.
L7-5(2)
The class instance number.
L7-5(3)
The class instance state.
L7-5(4)
A pointer to a class instance communication structure. This structure holds
information regarding the interface’s endpoints used for data communication.
Listing 7-6 presents the communication structure.
L7-5(5)
Class-specific fields.
108
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