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usbd

conﬁguration

Get the conﬁguration descriptor for a speciﬁc conﬁguration setting

Synopsis:

#include <sys/usbdi.h>

usbd_configuration_descriptor_t

*usbd_configuration_descriptor(

struct usbd_device *device,

_uint8 cfg,

struct usbd_desc_node **node );

Arguments:

device An opaque handle used to identify the USB device.

cfg The device’s conﬁguration identiﬁer (

bConfigurationValue).

node Indicates the descriptor’s location for rooting future requests (e.g.

interfaces of this conﬁguration).

Library:

libusbdi

Description:

The usbd

conﬁguration

descriptor() function lets you obtain the conﬁguration

descriptor for a speciﬁc conﬁguration setting.

The

usbd_configuration_descriptor_t structure looks like this:

typedef struct usbd_configuration_descriptor {

_uint8 bLength;

_uint8 bDescriptorType;

_uint16 wTotalLength;

_uint8 bNumInterfaces;

_uint8 bConfigurationValue;

_uint8 iConfiguration;

_uint8 bmAttributes;

_uint8 MaxPower;

} usbd_configuration_descriptor_t;

Returns:

A pointer to usbd_configuration_descriptor_t on success, or NULL on error.

Classiﬁcation:

QNX Neutrino, QNX 4

26 Chapter 4 • USB Library Reference September 10, 2007

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