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lpt-port.h

/*
 * This file contains defines to control the LPT port.
 * A lot of this was originally in hd44780-low.h
 *
 * Moved from the HD44780 driver by Joris Robijn.
 *
 * This file is released under the GNU General Public License. Refer to the
 * COPYING file distributed with this package.
 *
 * Copyright (c)  2000, 1999, 1995 Benjamin Tse <blt@Comports.com>
 *            2001 Joris Robijn <joris@robijn.net>
 *            2001 Mark Haemmerling <mail@markh.de>
 *            2000 Charles Steinkuehler <cstein@newtek.com>
 *            1999 Andrew McMeikan <andrewm@engineer.com>
 *            1998 Richard Rognlie <rrognlie@gamerz.net>
 *            1997 Matthias Prinke <m.prinke@trashcan.mcnet.de>
 */

#ifndef LPT_PORT_H
#define LPT_PORT_H


/* Output data
 * Write to baseaddress+0
 */
/* Straight-forward use, no defines needed for this... */


/* Control output lines
 * Write to baseaddress+2
 */
#define nSTRB     0x01  /* pin 1; negative logic */
#define STRB      0x01
#define nLF       0x02  /* pin 14 */
#define LF  0x02
#define INIT      0x04  /* pin 16; the only positive logic output line */
#define nSEL      0x08  /* pin 17 */
#define SEL       0x08
#define ENIRQ     0x10  /* Enable IRQ via ACK line (don't enable this without
                   * setting up interrupt stuff too) */
#define ENBI      0x20  /* Enable bi-directional port (is nice to play with!
                   * I first didn't know a SPP could do this) */

#define OUTMASK   0x0B  /* SEL, LF and STRB are hardware inverted */
                  /* Use this mask only for the control output lines */
                  /* XOR with this mask ( ^ OUTMASK ) */


/* Control input lines
 * Read from baseaddress+1
 */
#define nFAULT    0x08  /* pin 15 */
#define FAULT     0x08
#define SELIN     0x10  /* pin 13 */
#define PAPEREND  0x20  /* pin 12 */
#define nACK      0x40  /* pin 10 */
#define ACK 0x40
#define BUSY      0x80  /* pin 11 */
#define IRQ 0x02

#define INMASK    0x84  /* BUSY input and the IRQ indicator are inverted */
                  /* Use this mask only for the control input lines */
                  /* XOR with this mask ( ^ OUTMASK ) */

#endif

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