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Chapter 5
5
Configuration
USBD_CFG_MAX_NBR_CFG
USBD_CFG_MAX_NBR_IF
USBD_CFG_MAX_NBR_IF_ALT
USBD_CFG_MAX_NBR_IF_GRP
USBD_CFG_MAX_NBR_EP_DESC
USBD_CFG_MAX_NBR_EP_OPEN
USBD_HID_CFG_MAX_NBR_DEV
USBD_HID_CFG_MAX_NBR_CFG
USBD_CDC_CFG_MAX_NBR_DEV
USBD_CDC_CFG_MAX_NBR_CFG
USBD_ACM_SERIAL_CFG_MAX_NBR_DEV
USBD_VENDOR_CFG_MAX_NBR_DEV
USBD_VENDOR_CFG_MAX_NBR_CFG
Value
4
7
7
2
9, 10, 11
or 12
8, 9, 10
or 11
1
4
2
2
2
1
2
Explanation
Two configurations for full/low-speed and two others for
high-speed.
First configuration:
One interface for HID.
Two interfaces for CDC-ACM.
Second configuration:
One interface for HID.
Two interfaces for CDC-ACM.
One interface for vendor.
No alternate interface needed, but this value must at least
be equal to USBD_CFG_MAX_NBR_IF .
CDC-ACM needs to group its communication and data
interfaces into a single USB function. Since there are two
CDC-ACM class instances, there will be two interface
groups.
One IN and (optional) OUT interrupt endpoint for HID.
Three endpoints for first CDC-ACM class instance.
Three endpoints for second CDC-ACM class instance.
Two bulk plus two optional interrupt endpoints for vendor.
In the worst case (host enables second configuration):
Two control endpoints for device’s standard requests.
One IN and (optional) OUT interrupt endpoint for HID.
Three endpoints for second CDC-ACM class instance.
Two bulk plus two optional interrupt endpoints for vendor.
Only one instance of HID class is needed. It will be shared
between all the configurations.
HID class instance can be used in all of device’s
configurations.
Two CDC base class instances are used.
Each CDC base class instance can be used in one full-
speed and one high-speed configuration.
Two ACM subclass instances are used.
Only one vendor class instance is used.
The vendor class instance can be used in one full-speed
and one high-speed configuration.
Table 5-3 Configuration Example of a Complex Composite High-Speed USB Device
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