4 i/o control codes, 4 i/o control codes – Lucent Technologies USS-720 User Manual
Page 67
Preliminary User Guide, Rev. 2
USS-720
February 1999
USB Device Driver
Lucent Technologies Inc.
7-9
13
4 I/O Control Codes
This section provides information for the I/O control codes used in the DeviceIoControl file function (see
Section 3.4). These control codes are used in the DeviceIoControl function to perform any of the following device-
specific operations.
Note: Refer to the header file <USS720io.h> included on the USS-720 Evaluation Kit diskette for details regarding
these control codes definitions. Please note that this file may be subject to periodic modifications. To obtain
more information about these control codes, contact In-System Design.
Control Code
Description
IOCTL_1284_ ECP_FWDTOREV
Negotiates the peripheral from forward idle to reverse while in
ECP register mode.
IOCTL_1284_ECP_REVTOFWD
Negotiates the peripheral from reverse to forward idle while in
ECP register mode.
IOCTL_1284_ ECP_SET_CHANNEL
Sets the ECP channel on the peripheral for reads and writes.
IOCTL_1284_ SET_MODE
Negotiates the peripheral into one of the valid register modes.
IOCTL_1284_ TERMINATE
Performs a standard 1284 termination sequence.
IOCTL_ABORT_PIPE
Cancels any pending transfers for the specified pipe. The pipe
state and endpoint state are unaffected.
IOCTL_CANCEL_PIPE_REQUEST
Cancels the current request on the specified pipe by flushing
the pipe and canceling any outstanding requests on that pipe.
IOCTL_GET_ALTSETTING
Retrieves the current alternate interface setting from the USS-
720 device.
IOCTL _GET_CAPABILITIES
Returns a variable buffer length containing the device capabil-
ities string. This is a
IEEE 1284 compatible string.
IOCTL_GET_CONFIGURATION_DESCRIPTOR Retrieves the current configuration descriptor.
IOCTL_GET_DEVICE_DESCRIPTOR
Receives the current device descriptor.
IOCTL_GET_DEVICE_INSTANCES
Returns a list of current devices based on the symbolic links
created during each device enumeration.
IOCTL_GET_INTERFACE
Gets the information about the current interface and pipes.
IOCTL _GET_PORT_STATUS
Returns a status byte.
IOCTL_ISSUE_USS720_COMMAND
Issues a specific command for the USS-720 device.
IOCTL _GET_1284_REGISTER
Returns all 1284 registers.
IOCTL_READ_INTERRUPT_PIPE
Reports changes in the parallel port and buffer status when
they occur.
IOCTL_RESET_PIPE
Clears the halted state of the specified pipe within the USB
stack and resets the stalled state of the endpoint on the
device.
IOCTL _SET_1284_REGISTER
Sets one of the 1284 registers.
IOCTL _SET_ALTSETTING
Sets the alternate interface setting.
IOCTL _SOFT_RESET
Resets the device, flushes the Bulk Out and Bulk In pipes to
the default states.