LPISSUE_CONTROL_TRANSFER (Windows Embedded CE 6.0)

1/6/2010

This function initiates a control transfer with a universal serial bus (USB) device on the specified endpoint.

Syntax

typedef USB_TRANSFER (* LPISSUE_CONTROL_TRANSFER)(
  USB_PIPE hPipe,
  LPTRANSFER_NOTIFY_ROUTINE lpStartAddress,
  LPVOID lpvNotifyParameter,
  DWORD dwFlags,
  LPCVOID lpvControlHeader,
  DWORD dwBufferSize,
  LPVOID lpvBuffer,
  ULONG uBufferPhysicalAddress
);

Parameters

• hPipe
  [in] Handle to an open USB pipe.

• lpStartAddress
  [in] Pointer to the address of a callback routine, or NULL if no callback routine is necessary.

• lpvNotifyParameter
  [in] Pointer to the parameter to pass to a callback routine of type LPTRANSFER_NOTIFY_ROUTINE.

• dwFlags
  [in] Flags for the transfer. Usbtypes.h declares the following flags:

  • USB_IN_TRANSFER
  • USB_OUT_TRANSFER
  • USB_NO_WAIT
  • USB_SHORT_TRANSFER_OK
  • USB_START_ISOCH_ASAP
  • USB_COMPRESS_ISOCH
  • USB_SEND_TO_DEVICE
  • USB_SEND_TO_INTERFACE
  • USB_SEND_TO_ENDPOINT
  • USB_DONT_BLOCK_FOR_MEM

• lpvControlHeader
  [in] Pointer to control header, 8 bytes.

• dwBufferSize
  [in] Size of the data buffer.

• lpvBuffer
  [in] Pointer to a data buffer. If a physical buffer address is specified, this must contain the virtual address of the buffer.

• uBufferPhysicalAddress
  [in] Physical address, which might be NULL, of the data buffer.

Return Value

A USB_TRANSFER handle indicates success. NULL indicates failure. IssueControlTransfer behaves either synchronously or asynchronously, depending on the value you provide for lpStartAddress and whether dwFlags contains the USB_NO_WAIT flag.

The following table shows the possible flags.

lpStartAddress	dwFlags | USB_NO_WAIT	Behavior
NULL	0	Synchronous
NULL	USB_NO_WAIT	Asynchronous
Non-NULL	0	Asynchronous
Non-NULL	USB_NO_WAIT	Asynchronous

When behaving asynchronously, this function invokes the callback function optionally specified by lpStartAddress when the transfer is complete.

Remarks

This function initiates a control transfer to a USB device.

Requirements

Header	usbdi.h
Windows Embedded CE	Windows CE 2.10 and later

See Also

Reference

USB Host Driver Functions
LPABORT_TRANSFER
LPGET_TRANSFER_STATUS
LPIS_TRANSFER_COMPLETE
LPTRANSFER_NOTIFY_ROUTINE