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Chapter 5
5
5-4-1 SIMPLE FULL-SPEED USB DEVICE
Table 5-1 shows the values that should be set for the different configuration constants
described earlier if you build a simple full-speed USB device using Micriμm’s vendor class.
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_VENDOR_CFG_MAX_NBR_DEV
USBD_VENDOR_CFG_MAX_NBR_CFG
Value
1
1
1
0
2 or 4
4 or 6
1
1
Explanation
Since device is full speed, only one configuration is
needed.
Since device only uses the vendor class, only one
interface is needed.
No alternate interfaces are needed, but this value must at
least be equal to USBD_CFG_MAX_NBR_IF .
No interface association needed.
Two bulk endpoints and two optional interrupt endpoints.
Two control endpoints for device’s standard requests.
Two bulk endpoints and two optional interrupt endpoints.
Only one instance of vendor class is needed.
Vendor class instance will only be used in one
configuration.
Table 5-1 Configuration Example of a Simple Full-Speed USB Device
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