Belkin F8E211 Guía de usuario descargar pdf (Pagina 62)

usbd endpoint descriptor()  2006, QNX Software Systems GmbH & Co. KG.

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 );

Description:

The usbd endpoint descriptor() function lets you obtain the endpoint

descriptor for a speciﬁc endpoint on a conﬁguration/interface.

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.

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;

50 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 62