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Static Stack Configuration
5
USBD_CFG_MAX_NBR_IF_ALT
USBD_CFG_MAX_NBR_IF_ALT defines the maximum number of alternate interfaces (alternate
settings) available. This value should at least be equal to USBD_CFG_MAX_NBR_IF. Refer to
the Universal Serial Bus specification, Revision 2.0, section 9.2.3 for more details on
alternate settings. Default value is 2 .
USBD_CFG_MAX_NBR_IF_GRP
USBD_CFG_MAX_NBR_IF_GRP sets the maximum number of interface groups or associations
available. For the moment, Micriμm offers only one USB class (CDC-ACM) that requires
interface groups. Refer to the Interface Association Descriptors USB Engineering Change
Notice for more details about interface associations. Default value is 0 (should be equal to
the number of instances of CDC-ACM).
USBD_CFG_MAX_NBR_EP_DESC
USBD_CFG_MAX_NBR_EP_DESC sets the maximum number of endpoint descriptors available.
This value greatly depends on the USB class(es) used. For information on how many
endpoints are needed for each class, refer to the class specific chapter. Keep in mind that
control endpoints do not need any endpoint descriptors. Default value is 2 .
USBD_CFG_MAX_NBR_EP_OPEN
USBD_CFG_MAX_NBR_EP_OPEN configures the maximum number of opened endpoints per
device. If you use more than one device, set this value to the worst case. This value greatly
depends on the USB class(es) used. For information on how many endpoints are needed for
each class, refer to the class specific chapter. Default value is 4 (2 control plus 2 other
endpoints).
5-1-4 STRING CONFIGURATION
USBD_CFG_MAX_NBR_STR
USBD_CFG_MAX_NBR_STR configures the maximum number of string descriptors supported.
Default value is 3 (1 Manufacturer string, 1 product string and 1 serial number string). This
value can be increased if, for example, you plan to add interface specific strings.
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