WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE function (wdfusb.h)

Artikel
10/21/2021

[Applies to KMDF and UMDF]

The WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE function initializes a WDF_USB_CONTROL_SETUP_PACKET structure for a USB control transfer that sets or clears a device feature.

Syntax

void WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE(
  [out] PWDF_USB_CONTROL_SETUP_PACKET Packet,
  [in]  WDF_USB_BMREQUEST_RECIPIENT   BmRequestRecipient,
  [in]  USHORT                        FeatureSelector,
  [in]  USHORT                        Index,
  [in]  BOOLEAN                       SetFeature
);

Parameters

[out] Packet

A pointer to a WDF_USB_CONTROL_SETUP_PACKET structure.

[in] BmRequestRecipient

A WDF_USB_BMREQUEST_RECIPIENT-typed value that is stored in the Packet.bm.Request.Recipient member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] FeatureSelector

A feature-specific value that is stored in the Packet.wValue.Value member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Index

A feature-specific index value that is stored in the Packet.wIndex.Value member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] SetFeature

A Boolean value that, if TRUE, indicates that the specified feature will be set. If FALSE, the specified feature will be cleared.

Return value

None

Remarks

The WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE function does the following:

Zeros the WDF_USB_CONTROL_SETUP_PACKET structure.
Sets the Packet.bm.Request.Type member to BmRequestStandard.
Sets the Packet.bm.Request.Dir member to BmRequestDeviceToDevice.
Sets the Packet.bRequest member to either a "set feature" or a "clear feature" request value, based on the SetFeature argument.
Sets other structure members by using the WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE function's input arguments.

To initialize a WDF_USB_CONTROL_SETUP_PACKET structure, the driver should call one of the following functions:

WDF_USB_CONTROL_SETUP_PACKET_INIT
WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS
WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE
WDF_USB_CONTROL_SETUP_PACKET_INIT_GET_STATUS
WDF_USB_CONTROL_SETUP_PACKET_INIT_VENDOR

Examples

The following code example initializes a WDF_USB_CONTROL_SETUP_PACKET structure.

WDF_USB_CONTROL_SETUP_PACKET packet;

WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE(
                                          &packet,
                                          BMREQUEST_TO_DEVICE,
                                          USB_DEVICE_DESCRIPTOR_TYPE,
                                          0,
                                          FALSE
                                          );

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	wdfusb.h (include Wdfusb.h)

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