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https://github.com/netfun2000/lcd4linux.git
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6d5d1055ea
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@840 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/* $Id$
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* $URL$
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*
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* generic driver helper for parallel port displays
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*
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* Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
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* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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*
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* exported fuctions:
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*
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* int drv_generic_parport_open (void)
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* reads 'Port' entry from config and opens
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* the parallel port
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* returns 0 if ok, -1 on failure
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*
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* int drv_generic_parport_close (void)
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* closes parallel port
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* returns 0 if ok, -1 on failure
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*
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* unsigned char drv_generic_parport_wire_ctrl (char *name, char *deflt)
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* reads wiring for one control signal from config
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* returns DRV_GENERIC_PARPORT_CONTROL_* or 255 on error
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*
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* unsigned char drv_generic_parport_hardwire_ctrl (char *name)
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* returns hardwiring for one control signal
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* same as above, but does not read from config,
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* but checks the config and emits a warning that the config
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* entry will be ignored
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* returns DRV_GENERIC_PARPORT_CONTROL_* or 255 on error
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*
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* unsigned char drv_generic_parport_wire_status (char *name, char *deflt)
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* reads wiring for one status signal from config
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* returns DRV_GENERIC_PARPORT_STATUS_* or 255 on error
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*
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* unsigned char drv_generic_parport_wire_data (char *name, char *deflt)
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* reads wiring for one data signal from config
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* returns 1<<bitpos or 255 on error
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*
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* void drv_generic_parport_direction (int direction)
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* 0 - write to parport
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* 1 - read from parport
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*
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* unsigned char drv_generic_parport_status (void)
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* reads control lines
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*
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* void drv_generic_parport_control (unsigned char mask, unsigned char value)
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* frobs control line and takes care of inverted signals
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*
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* void drv_generic_parport_toggle (unsigned char bit, int level, int delay)
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* toggles the line <bit> to <level> for <delay> nanoseconds
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*
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* void drv_generic_parport_data (unsigned char value)
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* put data bits on DB1..DB8
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*
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* unsigned char drv_generic_parport_read (void)
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* reads a byte from the parallel port
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*
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* void drv_generic_parport_debug(void)
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* prints status of control lines
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*
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*/
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#ifndef _DRV_GENERIC_PARPORT_H_
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#define _DRV_GENERIC_PARPORT_H_
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int drv_generic_parport_open(const char *section, const char *driver);
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int drv_generic_parport_close(void);
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unsigned char drv_generic_parport_wire_ctrl(const char *name, const char *deflt);
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unsigned char drv_generic_parport_hardwire_ctrl(const char *name, const char *deflt);
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unsigned char drv_generic_parport_wire_status(const char *name, const char *deflt);
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unsigned char drv_generic_parport_wire_data(const char *name, const char *deflt);
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void drv_generic_parport_direction(const int direction);
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unsigned char drv_generic_parport_status(void);
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void drv_generic_parport_control(const unsigned char mask, const unsigned char value);
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void drv_generic_parport_toggle(const unsigned char bit, const int level, const unsigned long delay);
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void drv_generic_parport_data(const unsigned char data);
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unsigned char drv_generic_parport_read(void);
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void drv_generic_parport_debug(void);
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#endif
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