1e41f4b71Sopenharmony_ci# UsbDdkInterface 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## Overview 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciDefines a USB DDK interface, which is a collection of alternate settings for a particular USB interface. 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**Since** 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ci10 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci**Related Modules** 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ci[UsbDdk](_usb_ddk.md) 15e41f4b71Sopenharmony_ci 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci## Summary 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ci 20e41f4b71Sopenharmony_ci### Member Variables 21e41f4b71Sopenharmony_ci 22e41f4b71Sopenharmony_ci| Name| Description| 23e41f4b71Sopenharmony_ci| -------- | -------- | 24e41f4b71Sopenharmony_ci| [numAltsetting](#numaltsetting) | Number of alternate settings of the interface.| 25e41f4b71Sopenharmony_ci| [altsetting](#altsetting) | Alternate setting of the interface.| 26e41f4b71Sopenharmony_ci 27e41f4b71Sopenharmony_ci 28e41f4b71Sopenharmony_ci## Member Variable Description 29e41f4b71Sopenharmony_ci 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci### altsetting 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci 34e41f4b71Sopenharmony_ci``` 35e41f4b71Sopenharmony_cistruct UsbDdkInterfaceDescriptor* UsbDdkInterface::altsetting 36e41f4b71Sopenharmony_ci``` 37e41f4b71Sopenharmony_ci 38e41f4b71Sopenharmony_ci**Description** 39e41f4b71Sopenharmony_ci 40e41f4b71Sopenharmony_ciAlternate setting of the interface. 41e41f4b71Sopenharmony_ci 42e41f4b71Sopenharmony_ci 43e41f4b71Sopenharmony_ci### numAltsetting 44e41f4b71Sopenharmony_ci 45e41f4b71Sopenharmony_ci 46e41f4b71Sopenharmony_ci``` 47e41f4b71Sopenharmony_ciuint8_t UsbDdkInterface::numAltsetting 48e41f4b71Sopenharmony_ci``` 49e41f4b71Sopenharmony_ci 50e41f4b71Sopenharmony_ci**Description** 51e41f4b71Sopenharmony_ci 52e41f4b71Sopenharmony_ciNumber of alternate settings of the interface. 53