Motorola USB08 - page 180

Designer Reference Manual USB08 Evaluation Board
180 Universal USB Device Driver (USBIO) MOTOROLA
Universal USB Device Driver (USBIO)
IOCTL_USBIO_PIPE_CONTROL_TRANSFER_IN
The IOCTL_USBIO_PIPE_CONTROL_TRANSFER_IN operation is
used to generate a specific request (setup packet) for a control pipe with
a data transfer direction from device to host.
lpInBuffer Pointer to a buffer that contains an
USBIO_PIPE_CONTROL_TRANSFER (page 209) data structure. This
data structure has to be filled completely by the caller.
nInBufferSize Specifies the size, in bytes, of the buffer pointed to by lpInBuffer,
which has to be sizeof(USBIO_PIPE_CONTROL_TRANSFER) for this
operation.
lpOutBuffer Pointer to a buffer that receives the data transferred from the device
during the data phase of the control transfer. If no data transfer is
required the pointer may be NULL.
nOutBufferSize Specifies the size, in bytes, of the buffer pointed to by lpOutBuffer. If
this value is set to zero then there is no data transfer phase.
Comments This request is intended to be used with additional control pipes a device
might provide. It is not possible to generate a control transfer for the
default endpoint zero with this operation.