Lucent Technologies USS-720 manual 4 I/O Control Codes, Preliminary User Guide, Rev, February

Preliminary User Guide, Rev. 2	USS-720
February 1999	USB Device Driver

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.

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