1# UsbEndpointDescriptor 2<!--Kit: Driver Development Kit--> 3<!--Subsystem: Driver--> 4<!--Owner: @lixinsheng2--> 5<!--Designer: @w00373942--> 6<!--Tester: @dong-dongzhen--> 7<!--Adviser: @w_Machine_cc--> 8 9## Overview 10 11Defines standard endpoint descriptors, which correspond to **Standard Endpoint Descriptor** in the USB protocol. 12 13**Since**: 10 14 15**Related module**: [UsbDDK](capi-usbddk.md) 16 17**Header file:** [usb_ddk_types.h](capi-usb-ddk-types-h.md) 18 19## Summary 20 21### Member Variables 22 23| Name| Description| 24| -- | -- | 25| uint8_t bLength | Size of the descriptor, in bytes.| 26| uint8_t bDescriptorType | Descriptor type.| 27| uint8_t bEndpointAddress | Endpoint address, including the endpoint number and endpoint direction.| 28| uint8_t bmAttributes | Endpoint attributes, including the transfer type, synchronization type, and usage type.| 29| uint16_t wMaxPacketSize | Maximum packet size supported by an endpoint.| 30| uint8_t bInterval | Interval for polling endpoints for data transfer.| 31| uint8_t bRefresh | Refresh rate for audio devices.| 32| uint8_t bSynchAddress | Endpoint synchronization address for audio devices.| 33