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Chapter
7
USB Classes
The USB classes available for the μC/USB-Device stack have some common characteristics.
This chapter explains these characteristics and the interactions with the core layer allowing
you to better understand the operation of classes.
7-1 CLASS INSTANCE CONCEPT
The USB classes available with the μC/USB-Device stack implement the concept of class
instances. A class instance represents one function within a device. The function can be
described by one interface or by a group of interfaces and belongs to a certain class.
Each USB class implementation has some configuration and functions in common based on
the concept of class instance. The common configuration and functions are presented in
Table 7-1. In the column heading 'Constants or Function', XXXX below can be replaced by
the name of the class: CDC, HID, MSC, PHDC or VENDOR (Vendor for function names). .
Constant or function
USBD_XXXX_CFG_MAX_NBR_DEV
USBD_XXXX_CFG_MAX_NBR_CFG
USBD_XXXX_Add()
USBD_XXXX_CfgAdd()
Description
Configures the maximum number of class instances.
Configures the maximum number of configurations per device. During the class
initialization, a created class instance will be added to one or more
configurations.
Creates a new class instance.
Adds an existing class instance to the specified device configuration.
Table 7-1 Constants and Functions Related to the Concept of Multiple Class Instances
In terms of code implementation, the class will declare a local global table that contains a
class control structure. The size of the table is determined by the constant
USBD_XXXX_CFG_MAX_NBR_DEV . This class control structure is associated with one class
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