UsbBuildFeatureRequest macro
The UsbBuildFeatureRequest macro formats an URB with the parameters necessary to request that a feature be turned on or off on a USB device.
Syntax
void UsbBuildFeatureRequest(
[in, out] PURB Urb,
[in] USHORT Op,
[in] USHORT FeatureSelector,
[in] USHORT Index,
[in] PURB Link
);
Parameters
Urb [in, out]
Pointer to an URB to be formatted as a feature request to a device.Op [in]
Specifies one of the following operation codes:URB_FUNCTION_SET_FEATURE_TO_DEVICE
Sets a USB-defined feature, specified by FeatureSelector, on a device.URB_FUNCTION_SET_FEATURE_TO_INTERFACE
Sets a USB-defined feature, specified by FeatureSelector, on an interface for a device.URB_FUNCTION_SET_FEATURE_TO_ENDPOINT
Sets a USB-defined feature, specified by FeatureSelector, on an endpoint for an interface on a USB device.URB_FUNCTION_SET_FEATURE_TO_OTHER
Sets a USB-defined feature, specified by FeatureSelector, on a device-defined target on a USB device.URB_FUNCTION_CLEAR_FEATURE_TO_DEVICE
Clears a USB-defined feature, specified by FeatureSelector, on a device.URB_FUNCTION_CLEAR_FEATURE_TO_INTERFACE
Clears a USB-defined feature, specified by FeatureSelector, on an interface for a device.URB_FUNCTION_CLEAR_FEATURE_TO_ENDPOINT
Clears a USB-defined feature, specified by FeatureSelector, on an endpoint, for an interface, on a USB device.URB_FUNCTION_CLEAR_FEATURE_TO_OTHER
Clears a USB-defined feature, specified by FeatureSelector, on a device-defined target on a USB device.
FeatureSelector [in]
Specifies the USB-defined feature code that should be set or cleared on the target as specified by Op.Index [in]
For a feature request for an endpoint or interface, specifies the index of the endpoint or interface within the configuration descriptor. For the device, this must be zero.Link [in]
Reserved. Must be set to NULL.
Return value
This macro does not return a value.
Requirements
Target platform |
Desktop |
Header |
Usbdlib.h (include Usbdlib.h) |
See also
USB device driver programming reference