1e41f4b71Sopenharmony_ci# UsbConfigDescriptor 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## Overview 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciDefines standard configuration descriptors, which correspond to **Standard Configuration Descriptor** in the USB protocol. 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**Since** 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ci10 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci**Related Modules** 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ci[USB DDK](_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| [bLength](#blength) | Size of the descriptor, in bytes.| 25e41f4b71Sopenharmony_ci| [bDescriptorType](#bdescriptortype) | Descriptor type.| 26e41f4b71Sopenharmony_ci| [wTotalLength](#wtotallength) | Total length of the configuration descriptor, including the configuration, interface, endpoint, and class- or vendor-specific descriptors.| 27e41f4b71Sopenharmony_ci| [bNumInterfaces](#bnuminterfaces) | Number of interfaces supported by the configuration.| 28e41f4b71Sopenharmony_ci| [bConfigurationValue](#bconfigurationvalue) | Configuration index, which is used to select the configuration.| 29e41f4b71Sopenharmony_ci| [iConfiguration](#iconfiguration) | Index of the string descriptor that describes the configuration.| 30e41f4b71Sopenharmony_ci| [bmAttributes](#bmattributes) | Configuration attributes, including the power mode and remote wakeup.| 31e41f4b71Sopenharmony_ci| [bMaxPower](#bmaxpower) | Maximum power consumption of the bus-powered USB device, in 2 mA.| 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci 34e41f4b71Sopenharmony_ci## Member Variable Description 35e41f4b71Sopenharmony_ci 36e41f4b71Sopenharmony_ci 37e41f4b71Sopenharmony_ci### bConfigurationValue 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ci 40e41f4b71Sopenharmony_ci``` 41e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bConfigurationValue 42e41f4b71Sopenharmony_ci``` 43e41f4b71Sopenharmony_ci 44e41f4b71Sopenharmony_ci**Description** 45e41f4b71Sopenharmony_ci 46e41f4b71Sopenharmony_ciConfiguration index, which is used to select the configuration. 47e41f4b71Sopenharmony_ci 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ci### bDescriptorType 50e41f4b71Sopenharmony_ci 51e41f4b71Sopenharmony_ci 52e41f4b71Sopenharmony_ci``` 53e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bDescriptorType 54e41f4b71Sopenharmony_ci``` 55e41f4b71Sopenharmony_ci 56e41f4b71Sopenharmony_ci**Description** 57e41f4b71Sopenharmony_ci 58e41f4b71Sopenharmony_ciDescriptor type. 59e41f4b71Sopenharmony_ci 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ci### bLength 62e41f4b71Sopenharmony_ci 63e41f4b71Sopenharmony_ci 64e41f4b71Sopenharmony_ci``` 65e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bLength 66e41f4b71Sopenharmony_ci``` 67e41f4b71Sopenharmony_ci 68e41f4b71Sopenharmony_ci**Description** 69e41f4b71Sopenharmony_ci 70e41f4b71Sopenharmony_ciSize of the descriptor, in bytes. 71e41f4b71Sopenharmony_ci 72e41f4b71Sopenharmony_ci 73e41f4b71Sopenharmony_ci### bmAttributes 74e41f4b71Sopenharmony_ci 75e41f4b71Sopenharmony_ci 76e41f4b71Sopenharmony_ci``` 77e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bmAttributes 78e41f4b71Sopenharmony_ci``` 79e41f4b71Sopenharmony_ci 80e41f4b71Sopenharmony_ci**Description** 81e41f4b71Sopenharmony_ci 82e41f4b71Sopenharmony_ciConfiguration attributes, including the power mode and remote wakeup. 83e41f4b71Sopenharmony_ci 84e41f4b71Sopenharmony_ci 85e41f4b71Sopenharmony_ci### bMaxPower 86e41f4b71Sopenharmony_ci 87e41f4b71Sopenharmony_ci 88e41f4b71Sopenharmony_ci``` 89e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bMaxPower 90e41f4b71Sopenharmony_ci``` 91e41f4b71Sopenharmony_ci 92e41f4b71Sopenharmony_ci**Description** 93e41f4b71Sopenharmony_ci 94e41f4b71Sopenharmony_ciMaximum power consumption of the bus-powered USB device, in 2 mA. 95e41f4b71Sopenharmony_ci 96e41f4b71Sopenharmony_ci 97e41f4b71Sopenharmony_ci### bNumInterfaces 98e41f4b71Sopenharmony_ci 99e41f4b71Sopenharmony_ci 100e41f4b71Sopenharmony_ci``` 101e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::bNumInterfaces 102e41f4b71Sopenharmony_ci``` 103e41f4b71Sopenharmony_ci 104e41f4b71Sopenharmony_ci**Description** 105e41f4b71Sopenharmony_ci 106e41f4b71Sopenharmony_ciNumber of interfaces supported by the configuration. 107e41f4b71Sopenharmony_ci 108e41f4b71Sopenharmony_ci 109e41f4b71Sopenharmony_ci### iConfiguration 110e41f4b71Sopenharmony_ci 111e41f4b71Sopenharmony_ci 112e41f4b71Sopenharmony_ci``` 113e41f4b71Sopenharmony_ciuint8_t UsbConfigDescriptor::iConfiguration 114e41f4b71Sopenharmony_ci``` 115e41f4b71Sopenharmony_ci 116e41f4b71Sopenharmony_ci**Description** 117e41f4b71Sopenharmony_ci 118e41f4b71Sopenharmony_ciIndex of the string descriptor that describes the configuration. 119e41f4b71Sopenharmony_ci 120e41f4b71Sopenharmony_ci 121e41f4b71Sopenharmony_ci### wTotalLength 122e41f4b71Sopenharmony_ci 123e41f4b71Sopenharmony_ci 124e41f4b71Sopenharmony_ci``` 125e41f4b71Sopenharmony_ciuint16_t UsbConfigDescriptor::wTotalLength 126e41f4b71Sopenharmony_ci``` 127e41f4b71Sopenharmony_ci 128e41f4b71Sopenharmony_ci**Description** 129e41f4b71Sopenharmony_ci 130e41f4b71Sopenharmony_ciTotal length of the configuration descriptor, including the configuration, interface, endpoint, and class- or vendor-specific descriptors. 131