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A
Appendix A
p_err
Pointer to variable that will receive the return error code from this function.
USBD_ERR_NONE
USBD_ERR_DEV_INVALID_NBR
USBD_ERR_DEV_INVALID_STATE
USBD_ERR_CFG_ALLOC
USBD_ERR_CFG_INVALID_MAX_PWR
RETURNED VALUE
Configuration number ,
If no error(s).
USBD_CFG_NBR_NONE,
otherwise.
CALLERS
Application.
NOTES / WARNINGS
■
USB spec 2.0, section 7.2.1.3/4 defines power constrains for bus-powered devices:
■
■
■
“A low-power function is one that draws up to one unit load from the USB cable
when operational”
“A function is defined as being high-power if, when fully powered, it draws over
one but no more than five unit loads from the USB cable.”
A unit load is defined as 100mA, thus max_pwr argument should be between 0 mA
and 500mA.
■
String support is optional, in this case ' p_name ' can be a NULL string pointer.
■
Configuration can only be added when
the device
is
in
either
the
USBD_DEV_STATE_NONE or USB_DEV_STATE_INIT states.
254
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