libusb_endpoint_descriptor Struct Reference
[USB descriptors]

A structure representing the standard USB endpoint descriptor. More...

#include <libusb.h>


Data Fields

uint8_t bLength
 Size of this descriptor (in bytes).
uint8_t bDescriptorType
 Descriptor type.
uint8_t bEndpointAddress
 The address of the endpoint described by this descriptor.
uint8_t bmAttributes
 Attributes which apply to the endpoint when it is configured using the bConfigurationValue.
uint16_t wMaxPacketSize
 Maximum packet size this endpoint is capable of sending/receiving.
uint8_t bInterval
 Interval for polling endpoint for data transfers.
uint8_t bRefresh
 For audio devices only: the rate at which synchronization feedback is provided.
uint8_t bSynchAddress
 For audio devices only: the address if the synch endpoint.
const unsigned char * extra
 Extra descriptors.
int extra_length
 Length of the extra descriptors, in bytes.


Detailed Description

A structure representing the standard USB endpoint descriptor.

This descriptor is documented in section 9.6.3 of the USB 2.0 specification. All multiple-byte fields are represented in host-endian format.


Field Documentation

Descriptor type.

Will have value libusb_descriptor_type::LIBUSB_DT_ENDPOINT LIBUSB_DT_ENDPOINT in this context.

The address of the endpoint described by this descriptor.

Bits 0:3 are the endpoint number. Bits 4:6 are reserved. Bit 7 indicates direction, see libusb_endpoint_direction.

Attributes which apply to the endpoint when it is configured using the bConfigurationValue.

Bits 0:1 determine the transfer type and correspond to libusb_transfer_type. Bits 2:3 are only used for isochronous endpoints and correspond to libusb_iso_sync_type. Bits 4:5 are also only used for isochronous endpoints and correspond to libusb_iso_usage_type. Bits 6:7 are reserved.

Maximum packet size this endpoint is capable of sending/receiving.

Interval for polling endpoint for data transfers.

For audio devices only: the rate at which synchronization feedback is provided.

const unsigned char* libusb_endpoint_descriptor::extra

Extra descriptors.

If libusb encounters unknown endpoint descriptors, it will store them here, should you wish to parse them.

Length of the extra descriptors, in bytes.


The documentation for this struct was generated from the following file:

Generated on Thu Oct 14 14:56:36 2010 for libusb by  doxygen 1.5.9