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Contents
Programming For USB Device
Overview
Programmers Guide
Scenario
Data transfer
Synchronous Transfer
Asynchronous Transfer
Reading Descriptors
USB Support Routines And Structures
Common Procedures
UsbEnumerateDevices
OpenRapidUsb
IsRapidUsbOpened
CloseRapidUsb
Descriptors
UsbGetDescriptor
UsbGetDeviceDescriptor
UsbGetStringDescriptor
UsbGetConfigDescriptor
UsbFreeConfigDescriptor
UsbGetInterfaceDescriptor
UsbFreeInterfaceDescriptor
UsbGetEndpointDescriptor
Configure Device
UsbGetDeviceInfo
UsbUnconfigureDevice
UsbSelectConfig
UsbGetConfig
UsbSelectInterface
UsbGetInterface
UsbResetDevice
UsbGetBandwidthInfo
UsbCyclePort
Features and Status
UsbSetFeature
UsbClearFeature
UsbGetStatus
Vendor/Class Requests
UsbVendorRequestIn
UsbVendorRequestOut
UsbClassRequestIn
UsbClassRequestOut
Pipes
IsRapidUsbPipeOpened
UsbPipeOpen
UsbPipeClose
UsbGetPipeCount
UsbPipeGetInfo
UsbPipeDirectionIn
UsbPipeGetType
UsbTransfer
UsbTransferAsync
TRANSFER_COMPLETION_ROUTINE
UsbCancelTransfer
UsbPipeReset
UsbPipeAbort
Other
UsbGetPortStatus
UsbGetCurrentFrameNumber
USB Structures and Types
RDUSB_DEVICE_INFORMATION
RDUSB_PIPE_INFORMATION
RDUSB_PIPE_TYPE
RDUSB_BANDWIDTH_INFORMATION
UsbClearFeature
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Language

Description

C/C++
BOOL UsbClearFeature(IN USB_DEVICE_HANDLE hUsb, 
IN RDUSB_REQUEST_RECIPIENT RequestRecipient,   
IN USHORT FeatureSelector,   
IN USHORT Index);  

Delphi
function UsbClearFeature(hUsb             : USB_DEVICE_HANDLE;
                         RequestRecipient : RDUSB_Request_Recipient;
                         FeatureSelector  : USHORT;
                         Index : USHORT)  : BOOL; stdcall;

VB
Function UsbClearFeature (ByVal hUsb As Long, _
                          ByVal Recepient As Byte, _
                          ByVal FeatSelector As Byte, _
                          ByVal FeatIndex As Byte) As Boolean



Parameters
 
hUsb  
Specifies device handle. This handle can be obtained with OpenRapidUsb.  
 
RequestRecipient  
Specifies recipient of feature request.  
 
FeatureSelector  
Specifies the USB-defined feature code that should be cleared on the target specified by RequestRecipient.  
 
Index  
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.  


Return Value
 
If function fails it return FALSE. To detect error call GetLastError function.  

Description
 
UsbClearFeature sends request to clear specified feature of USB device.