1e41f4b71Sopenharmony_ci# UsbControlRequestSetup 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## Overview 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciSetup data for control transfer. It corresponds to <b>Setup Data</b> 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| [bmRequestType](#bmrequesttype) | Request type.| 25e41f4b71Sopenharmony_ci| [bRequest](#brequest) | Specific request.| 26e41f4b71Sopenharmony_ci| [wValue](#wvalue) | Value corresponding to **wValue** in the USB protocol. Its meaning varies according to the request.| 27e41f4b71Sopenharmony_ci| [wIndex](#windex) | Index corresponding to **wIndex** in the USB protocol. It is usually used to transfer the index or offset. Its meaning varies according to the request. | 28e41f4b71Sopenharmony_ci| [wLength](#wlength) | Data length corresponding to **wLength** in the USB protocol. If data is transferred, this field indicates the number of transferred bytes.| 29e41f4b71Sopenharmony_ci 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci## Member Variable Description 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci 34e41f4b71Sopenharmony_ci### wIndex 35e41f4b71Sopenharmony_ci 36e41f4b71Sopenharmony_ci 37e41f4b71Sopenharmony_ci``` 38e41f4b71Sopenharmony_ciuint16_t UsbControlRequestSetup::wIndex 39e41f4b71Sopenharmony_ci``` 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ci**Description** 42e41f4b71Sopenharmony_ci 43e41f4b71Sopenharmony_ciIndex corresponding to **wIndex** in the USB protocol. It is usually used to transfer the index or offset. Its meaning varies according to the request. 44e41f4b71Sopenharmony_ci 45e41f4b71Sopenharmony_ci 46e41f4b71Sopenharmony_ci### wLength 47e41f4b71Sopenharmony_ci 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ci``` 50e41f4b71Sopenharmony_ciuint16_t UsbControlRequestSetup::wLength 51e41f4b71Sopenharmony_ci``` 52e41f4b71Sopenharmony_ci 53e41f4b71Sopenharmony_ci**Description** 54e41f4b71Sopenharmony_ci 55e41f4b71Sopenharmony_ciData length, corresponding to **wLength** in the USB protocol. If data is transferred, this field indicates the number of transferred bytes. 56e41f4b71Sopenharmony_ci 57e41f4b71Sopenharmony_ci 58e41f4b71Sopenharmony_ci### bRequest 59e41f4b71Sopenharmony_ci 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ci``` 62e41f4b71Sopenharmony_ciuint8_t UsbControlRequestSetup::bRequest 63e41f4b71Sopenharmony_ci``` 64e41f4b71Sopenharmony_ci 65e41f4b71Sopenharmony_ci**Description** 66e41f4b71Sopenharmony_ci 67e41f4b71Sopenharmony_ciSpecific request. 68e41f4b71Sopenharmony_ci 69e41f4b71Sopenharmony_ci 70e41f4b71Sopenharmony_ci### bmRequestType 71e41f4b71Sopenharmony_ci 72e41f4b71Sopenharmony_ci 73e41f4b71Sopenharmony_ci``` 74e41f4b71Sopenharmony_ciuint8_t UsbControlRequestSetup::bmRequestType 75e41f4b71Sopenharmony_ci``` 76e41f4b71Sopenharmony_ci 77e41f4b71Sopenharmony_ci**Description** 78e41f4b71Sopenharmony_ci 79e41f4b71Sopenharmony_ciRequest type. 80e41f4b71Sopenharmony_ci 81e41f4b71Sopenharmony_ci 82e41f4b71Sopenharmony_ci### wValue 83e41f4b71Sopenharmony_ci 84e41f4b71Sopenharmony_ci 85e41f4b71Sopenharmony_ci``` 86e41f4b71Sopenharmony_ciuint16_t UsbControlRequestSetup::wValue 87e41f4b71Sopenharmony_ci``` 88e41f4b71Sopenharmony_ci 89e41f4b71Sopenharmony_ci**Description** 90e41f4b71Sopenharmony_ci 91e41f4b71Sopenharmony_ciValue corresponding to **wValue** in the USB protocol. Its meaning varies according to the request. 92