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Chapter 5
5
5-1-1 GENERIC CONFIGURATION
USBD_CFG_OPTIMIZE_SPD
Selected portions of μC/USB-Device code may be optimized for either better performance
or for smallest code size by configuring USBD_CFG_OPTIMIZE_SPD :
DEF_ENABLED
Optimizes μC/USB-Device for best speed performance
DEF_DISABLED
Optimizes μC/USB-Device for best binary image size
USBD_CFG_MAX_NBR_DEV
USBD_CFG_MAX_NBR_DEV configures the maximum number of devices. This value should be
set to the number of device controllers used on your platform. Default value is 1 .
5-1-2 USB DEVICE CONFIGURATION
USBD_CFG_MAX_NBR_CFG
USBD_CFG_MAX_NBR_CFG sets the maximum number of USB configurations used by your
device. Keep in mind that if you use a high-speed USB device controller, you will need at
least two USB configurations, one for low and full-speed and another for high-speed. Refer
to the Universal Serial Bus specification, Revision 2.0, section 9.2.3 for more details on USB
configuration. Default value is 2 .
5-1-3 INTERFACE CONFIGURATION
USBD_CFG_MAX_NBR_IF
USBD_CFG_MAX_NBR_IF configures the maximum number of interfaces available. This value
should at least be equal to USBD_CFG_MAX_NBR_CFG and greatly depends on the USB
class(es) used. Each class instance requires at least one interface, while CDC-ACM requires
two. Refer to the Universal Serial Bus specification, Revision 2.0, section 9.2.3 for more
details on USB interfaces. Default value is 2 .
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