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https://github.com/netfun2000/lcd4linux.git
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f738480140
first (incomplete) GPO implementation git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@80 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
597 lines
13 KiB
C
597 lines
13 KiB
C
/* $Id: HD44780.c,v 1.12 2001/02/14 07:40:16 reinelt Exp $
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*
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* driver for display modules based on the HD44780 chip
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*
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* Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
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*
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* This program 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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* This program 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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* $Log: HD44780.c,v $
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* Revision 1.12 2001/02/14 07:40:16 reinelt
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*
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* first (incomplete) GPO implementation
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*
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* Revision 1.11 2001/02/13 12:43:24 reinelt
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*
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* HD_gpo() was missing
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*
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* Revision 1.10 2001/02/13 09:00:13 reinelt
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*
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* prepared framework for GPO's (general purpose outputs)
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*
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* Revision 1.9 2000/10/20 07:17:07 reinelt
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*
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*
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* corrected a bug in HD_goto()
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* Thanks to Gregor Szaktilla <gregor@szaktilla.de>
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*
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* Revision 1.8 2000/08/10 09:44:09 reinelt
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*
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* new debugging scheme: error(), info(), debug()
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* uses syslog if in daemon mode
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*
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* Revision 1.7 2000/08/09 09:50:29 reinelt
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*
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* opened 0.98 development
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* removed driver-specific signal-handlers
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* added 'quit'-function to driver structure
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* added global signal-handler
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*
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* Revision 1.6 2000/07/31 10:43:44 reinelt
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*
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* some changes to support kernel-2.4 (different layout of various files in /proc)
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*
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* Revision 1.5 2000/07/31 06:46:35 reinelt
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*
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* eliminated some compiler warnings with glibc
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*
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* Revision 1.4 2000/04/15 16:56:52 reinelt
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*
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* moved delay loops to udelay.c
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* renamed -d (debugging) switch to -v (verbose)
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* new switch -d to calibrate delay loop
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* 'Delay' entry for HD44780 back again
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* delay loops will not calibrate automatically, because this will fail with hich CPU load
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*
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* Revision 1.3 2000/04/15 11:13:54 reinelt
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*
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* added '-d' (debugging) switch
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* added several debugging messages
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* removed config entry 'Delay' for HD44780 driver
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* delay loop for HD44780 will be calibrated automatically
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*
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* Revision 1.2 2000/04/13 06:09:52 reinelt
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*
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* added BogoMips() to system.c (not used by now, maybe sometimes we can
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* calibrate our delay loop with this value)
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*
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* added delay loop to HD44780 driver. It seems to be quite fast now. Hopefully
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* no compiler will optimize away the delay loop!
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*
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* Revision 1.1 2000/04/12 08:05:45 reinelt
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*
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* first version of the HD44780 driver
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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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* struct LCD HD44780[]
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <errno.h>
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#ifdef HAVE_SYS_IO_H
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#include <sys/io.h>
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#else
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#ifdef HAVE_ASM_IO_H
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#include <asm/io.h>
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#else
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#error "neither sys/io.h nor asm/io.h found!"
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#endif
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#endif
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#include "debug.h"
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#include "cfg.h"
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#include "display.h"
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#include "udelay.h"
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#define XRES 5
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#define YRES 8
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#define CHARS 8
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#define BARS ( BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 )
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typedef struct {
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int len1;
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int len2;
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int type;
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int segment;
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} BAR;
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typedef struct {
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int len1;
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int len2;
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int type;
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int used;
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int ascii;
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} SEGMENT;
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static LCD Lcd;
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static unsigned short Port=0;
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static char Txt[4][40];
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static BAR Bar[4][40];
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static int GPO=0;
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static int nSegment=2;
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static SEGMENT Segment[128] = {{ len1:0, len2:0, type:255, used:0, ascii:32 },
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{ len1:255, len2:255, type:255, used:0, ascii:255 }};
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static void HD_command (unsigned char cmd, int delay)
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{
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outb (cmd, Port); // put data on DB1..DB8
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outb (0x02, Port+2); // set Enable = bit 0 invertet
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udelay (1);
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outb (0x03, Port+2); // clear Enable
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udelay (delay);
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}
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static void HD_write (char *string, int len, int delay)
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{
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while (len--) {
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outb (*string++, Port); // put data on DB1..DB8
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outb (0x00, Port+2); // set Enable = bit 0 invertet
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udelay (1);
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outb (0x01, Port+2); // clear Enable
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udelay (delay);
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}
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}
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static void HD_setGPO (int bits)
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{
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if (Lcd.gpos>0) {
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outb (bits, Port); // put data on DB1..DB8
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outb (0x05, Port+2); // set INIT = bit 2 invertet
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udelay (1);
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outb (0x03, Port+2); // clear INIT
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udelay (1);
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}
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}
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static int HD_open (void)
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{
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debug ("using port 0x%x", Port);
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if (ioperm(Port, 3, 1)!=0) {
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error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno));
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return -1;
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}
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HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms
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HD_command (0x30, 100); // 8 Bit mode, wait 100 us
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HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms
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HD_command (0x38, 40); // 8 Bit mode, 1/16 duty cycle, 5x8 font
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HD_command (0x08, 40); // Display off, cursor off, blink off
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HD_command (0x0c, 1640); // Display on, cursor off, blink off, wait 1.64 ms
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HD_command (0x06, 40); // curser moves to right, no shift
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return 0;
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}
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static void HD_process_bars (void)
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{
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int row, col;
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int i, j;
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for (i=2; i<nSegment && Segment[i].used; i++);
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for (j=i+1; j<nSegment; j++) {
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if (Segment[j].used)
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Segment[i++]=Segment[j];
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}
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nSegment=i;
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for (row=0; row<Lcd.rows; row++) {
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for (col=0; col<Lcd.cols; col++) {
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if (Bar[row][col].type==0) continue;
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for (i=0; i<nSegment; i++) {
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if (Segment[i].type & Bar[row][col].type &&
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Segment[i].len1== Bar[row][col].len1 &&
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Segment[i].len2== Bar[row][col].len2) break;
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}
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if (i==nSegment) {
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nSegment++;
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Segment[i].len1=Bar[row][col].len1;
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Segment[i].len2=Bar[row][col].len2;
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Segment[i].type=Bar[row][col].type;
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Segment[i].used=0;
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Segment[i].ascii=-1;
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}
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Bar[row][col].segment=i;
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}
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}
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}
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static int HD_segment_diff (int i, int j)
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{
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int RES;
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int i1, i2, j1, j2;
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if (i==j) return 65535;
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if (!(Segment[i].type & Segment[j].type)) return 65535;
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if (Segment[i].len1==0 && Segment[j].len1!=0) return 65535;
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if (Segment[i].len2==0 && Segment[j].len2!=0) return 65535;
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RES=Segment[i].type & BAR_H ? XRES:YRES;
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if (Segment[i].len1>=RES && Segment[j].len1<RES) return 65535;
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if (Segment[i].len2>=RES && Segment[j].len2<RES) return 65535;
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if (Segment[i].len1==Segment[i].len2 && Segment[j].len1!=Segment[j].len2) return 65535;
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i1=Segment[i].len1; if (i1>RES) i1=RES;
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i2=Segment[i].len2; if (i2>RES) i2=RES;
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j1=Segment[j].len1; if (j1>RES) i1=RES;
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j2=Segment[j].len2; if (j2>RES) i2=RES;
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return (i1-i2)*(i1-i2)+(j1-j2)*(j1-j2);
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}
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static void HD_compact_bars (void)
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{
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int i, j, r, c, min;
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int pack_i, pack_j;
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int pass1=1;
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int deviation[nSegment][nSegment];
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if (nSegment>CHARS+2) {
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for (i=2; i<nSegment; i++) {
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for (j=0; j<nSegment; j++) {
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deviation[i][j]=HD_segment_diff(i,j);
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}
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}
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while (nSegment>CHARS+2) {
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min=65535;
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pack_i=-1;
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pack_j=-1;
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for (i=2; i<nSegment; i++) {
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if (pass1 && Segment[i].used) continue;
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for (j=0; j<nSegment; j++) {
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if (deviation[i][j]<min) {
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min=deviation[i][j];
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pack_i=i;
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pack_j=j;
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}
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}
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}
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if (pack_i==-1) {
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if (pass1) {
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pass1=0;
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continue;
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} else {
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error ("HD44780: unable to compact bar characters");
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nSegment=CHARS;
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break;
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}
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}
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nSegment--;
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Segment[pack_i]=Segment[nSegment];
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for (i=0; i<nSegment; i++) {
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deviation[pack_i][i]=deviation[nSegment][i];
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deviation[i][pack_i]=deviation[i][nSegment];
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}
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for (r=0; r<Lcd.rows; r++) {
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for (c=0; c<Lcd.cols; c++) {
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if (Bar[r][c].segment==pack_i)
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Bar[r][c].segment=pack_j;
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if (Bar[r][c].segment==nSegment)
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Bar[r][c].segment=pack_i;
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}
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}
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}
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}
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}
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static void HD_define_chars (void)
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{
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int c, i, j;
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char buffer[8];
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for (i=2; i<nSegment; i++) {
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if (Segment[i].used) continue;
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if (Segment[i].ascii!=-1) continue;
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for (c=0; c<CHARS; c++) {
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for (j=2; j<nSegment; j++) {
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if (Segment[j].ascii==c) break;
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}
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if (j==nSegment) break;
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}
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Segment[i].ascii=c;
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switch (Segment[i].type) {
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case BAR_L:
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for (j=0; j<4; j++) {
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char Pixel[] = { 0, 1, 3, 7, 15, 31 };
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buffer[j]=Pixel[Segment[i].len1];
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buffer[j+4]=Pixel[Segment[i].len2];
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}
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break;
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case BAR_R:
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for (j=0; j<4; j++) {
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char Pixel[] = { 0, 16, 24, 28, 30, 31 };
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buffer[j]=Pixel[Segment[i].len1];
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buffer[j+4]=Pixel[Segment[i].len2];
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}
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break;
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case BAR_U:
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for (j=0; j<Segment[i].len1; j++) {
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buffer[7-j]=31;
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}
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for (; j<YRES; j++) {
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buffer[7-j]=0;
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}
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break;
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case BAR_D:
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for (j=0; j<Segment[i].len1; j++) {
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buffer[j]=31;
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}
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for (; j<YRES; j++) {
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buffer[j]=0;
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}
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break;
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}
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HD_command (0x40|8*c, 40);
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HD_write (buffer, 8, 120); // 120 usec delay for CG RAM write
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}
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}
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int HD_clear (void)
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{
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int row, col;
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for (row=0; row<Lcd.rows; row++) {
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for (col=0; col<Lcd.cols; col++) {
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Txt[row][col]='\t';
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Bar[row][col].len1=-1;
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Bar[row][col].len2=-1;
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Bar[row][col].type=0;
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Bar[row][col].segment=-1;
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}
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}
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GPO=0;
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HD_setGPO (GPO); // All GPO's off
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HD_command (0x01, 1640); // clear display
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return 0;
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}
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int HD_init (LCD *Self)
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{
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int rows=-1, cols=-1, gpos=-1;
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char *s, *e;
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s=cfg_get ("Port");
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if (s==NULL || *s=='\0') {
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error ("HD44780: no 'Port' entry in %s", cfg_file());
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return -1;
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}
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if ((Port=strtol(s, &e, 0))==0 || *e!='\0') {
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error ("HD44780: bad port '%s' in %s", s, cfg_file());
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return -1;
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}
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s=cfg_get ("Delay");
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if (s==NULL || *s=='\0') {
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error ("HD44780: no 'Delay' entry in %s", cfg_file());
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return -1;
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}
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if ((loops_per_usec=strtol(s, &e, 0))==0 || *e!='\0') {
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error ("HD44780: bad delay '%s' in %s", s, cfg_file());
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return -1;
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}
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s=cfg_get("Size");
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if (s==NULL || *s=='\0') {
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error ("HD44780: no 'Size' entry in %s", cfg_file());
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return -1;
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}
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if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
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error ("HD44780: bad size '%s'",s);
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return -1;
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}
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s=cfg_get ("GPOs");
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if (s==NULL) {
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gpos=0;
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}
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else if ((gpos=strtol(s, &e, 0))==0 || *e!='\0' || gpos<0 || gpos>8) {
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error ("HD44780: bad GPOs '%s' in %s", s, cfg_file());
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return -1;
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}
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Self->rows=rows;
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Self->cols=cols;
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Self->gpos=gpos;
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Lcd=*Self;
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if (HD_open()!=0)
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return -1;
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HD_clear();
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return 0;
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}
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void HD_goto (int row, int col)
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{
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int pos;
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pos=(row%2)*64+(row/2)*20+col;
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HD_command (0x80|pos, 40);
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}
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int HD_put (int row, int col, char *text)
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{
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char *p=&Txt[row][col];
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char *t=text;
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while (*t && col++<=Lcd.cols) {
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*p++=*t++;
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}
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return 0;
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}
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int HD_bar (int type, int row, int col, int max, int len1, int len2)
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{
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int rev=0;
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if (len1<1) len1=1;
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else if (len1>max) len1=max;
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if (len2<1) len2=1;
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else if (len2>max) len2=max;
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switch (type) {
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case BAR_L:
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len1=max-len1;
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len2=max-len2;
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rev=1;
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case BAR_R:
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while (max>0 && col<=Lcd.cols) {
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Bar[row][col].type=type;
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Bar[row][col].segment=-1;
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if (len1>=XRES) {
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Bar[row][col].len1=rev?0:XRES;
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len1-=XRES;
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} else {
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Bar[row][col].len1=rev?XRES-len1:len1;
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len1=0;
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}
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if (len2>=XRES) {
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Bar[row][col].len2=rev?0:XRES;
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len2-=XRES;
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} else {
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Bar[row][col].len2=rev?XRES-len2:len2;
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len2=0;
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}
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max-=XRES;
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col++;
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}
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break;
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case BAR_U:
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len1=max-len1;
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len2=max-len2;
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rev=1;
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case BAR_D:
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while (max>0 && row<=Lcd.rows) {
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Bar[row][col].type=type;
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Bar[row][col].segment=-1;
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if (len1>=YRES) {
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Bar[row][col].len1=rev?0:YRES;
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len1-=YRES;
|
|
} else {
|
|
Bar[row][col].len1=rev?YRES-len1:len1;
|
|
len1=0;
|
|
}
|
|
if (len2>=YRES) {
|
|
Bar[row][col].len2=rev?0:YRES;
|
|
len2-=YRES;
|
|
} else {
|
|
Bar[row][col].len2=rev?YRES-len2:len2;
|
|
len2=0;
|
|
}
|
|
max-=YRES;
|
|
row++;
|
|
}
|
|
break;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int HD_gpo (int num, int val)
|
|
{
|
|
if (num>=Lcd.gpos)
|
|
return -1;
|
|
|
|
if (val) {
|
|
GPO |= 1<<num; // set bit
|
|
} else {
|
|
GPO &= ~(1<<num); // clear bit
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int HD_flush (void)
|
|
{
|
|
char buffer[256];
|
|
char *p;
|
|
int s, row, col;
|
|
|
|
HD_process_bars();
|
|
HD_compact_bars();
|
|
HD_define_chars();
|
|
|
|
for (s=0; s<nSegment; s++) {
|
|
Segment[s].used=0;
|
|
}
|
|
|
|
for (row=0; row<Lcd.rows; row++) {
|
|
for (col=0; col<Lcd.cols; col++) {
|
|
s=Bar[row][col].segment;
|
|
if (s!=-1) {
|
|
Segment[s].used=1;
|
|
Txt[row][col]=Segment[s].ascii;
|
|
}
|
|
}
|
|
for (col=0; col<Lcd.cols; col++) {
|
|
if (Txt[row][col]=='\t') continue;
|
|
HD_goto (row, col);
|
|
for (p=buffer; col<Lcd.cols; col++, p++) {
|
|
if (Txt[row][col]=='\t') break;
|
|
*p=Txt[row][col];
|
|
}
|
|
HD_write (buffer, p-buffer, 40);
|
|
}
|
|
}
|
|
|
|
HD_setGPO(GPO);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int HD_quit (void)
|
|
{
|
|
debug ("closing port 0x%x", Port);
|
|
if (ioperm(Port, 3, 0)!=0) {
|
|
error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
LCD HD44780[] = {
|
|
{ "HD44780",0,0,XRES,YRES,BARS,0,HD_init,HD_clear,HD_put,HD_bar,HD_gpo,HD_flush,HD_quit },
|
|
{ NULL }
|
|
};
|