Belkin F8E211 Podręcznik Użytkownika Pobierz pdf (Strona 55)

endpoint

descriptor()

Get the endpoint descriptor for a speciﬁc endpoint setting

Synopsis:

#include <sys/usbdi.h>

usbd_endpoint_descriptor_t

*usbd_endpoint_descriptor(

struct usbd_device *device,

_uint8 conﬁg,

_uint8 iface,

_uint8 alt,

_uint8 endpoint,

struct usbd_desc_node **node );

Arguments:

device An opaque handle used to identify the USB device.

conﬁg Conﬁguration identiﬁer (

bConfigurationValue).

ifc Interface identiﬁer (

bInterfaceNumber).

alt Alternate identiﬁer (

bAlternateSetting).

endpoint Endpoint identiﬁer (

bEndpointAddress).

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

Library:

libusbdi

Description:

The usbd

endpoint

descriptor() function lets you obtain the endpoint descriptor for a

speciﬁc endpoint on a conﬁguration/interface.

The

endpoint_descriptor_t structure looks like this:

typedef struct usbd_endpoint_descriptor {

_uint8 bLength;

_uint8 bDescriptorType;

_uint8 bEndpointAddress;

_uint8 bmAttributes;

_uint16 wMaxPacketSize;

_uint8 bInterval;

} usbd_endpoint_descriptor_t;

Returns:

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

September 10, 2007 Chapter 4 • USB Library Reference 41

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