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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_PHDC_CFG_MAX_NBR_DEV
USBD_PHDC_CFG_MAX_NBR_CFG
USBD_MSC_CFG_MAX_NBR_DEV
USBD_MSC_CFG_MAX_NBR_CFG
Value
2
4
4
0
4 or 5
6 or 7
1
2
1
2
Explanation
One configuration for full/low-speed and another for high-
speed.
One interface for PHDC and another for MSC. A different
interface for each configuration is also needed.
No alternate interface needed, but this value must at least
be equal to USBD_CFG_MAX_NBR_IF .
No interface association needed.
Two bulk endpoints for MSC.
Two bulk plus one optional interrupt endpoint for PHDC.
Two control endpoints for device’s standard requests.
Two bulk endpoints for MSC.
Two bulk plus 1 optional interrupt endpoint for PHDC.
Only one instance of PHDC is needed. It will be shared
between all the configurations.
PHDC instance can be used in both of device’s
configurations.
Only one instance of MSC is needed. It will be shared
between all the configurations.
MSC instance can be used in both of device’s
configurations.
Table 5-2 Configuration Example of a Composite High-Speed USB Device
5-4-3 COMPLEX COMPOSITE HIGH-SPEED USB DEVICE
Table 5-3 shows the values that should be set for the different configuration constants
described earlier if you build a composite high-speed USB device using a single instance of
Micriμm’s HID class in two different configurations plus a different instance of Micriμm’s CDC-
ACM class in each configuration. The device also uses an instance of Micriμm’s vendor class in
its second configuration. See Figure 5-2 for a graphical description of this USB device.
74
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