harmony 鸿蒙UsbControlRequestSetup
UsbControlRequestSetup
Overview
Setup data for control transfer. It corresponds to Setup Data in the USB protocol.
Since
10
Related Modules
Header file: usb_ddk_types.h
Summary
Member Variables
| Name | Description |
|---|---|
| bmRequestType | Request type. |
| bRequest | Specific request. |
| wValue | Value corresponding to wValue in the USB protocol. Its meaning varies according to the request. |
| 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. |
| wLength | Data length corresponding to wLength in the USB protocol. If data is transferred, this field indicates the number of transferred bytes. |
Member Variable Description
wIndex
uint16_t UsbControlRequestSetup::wIndex
Description
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.
wLength
uint16_t UsbControlRequestSetup::wLength
Description
Data length, corresponding to wLength in the USB protocol. If data is transferred, this field indicates the number of transferred bytes.
bRequest
uint8_t UsbControlRequestSetup::bRequest
Description
Specific request.
bmRequestType
uint8_t UsbControlRequestSetup::bmRequestType
Description
Request type.
wValue
uint16_t UsbControlRequestSetup::wValue
Description
Value corresponding to wValue in the USB protocol. Its meaning varies according to the request.
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