HD44780.c


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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */#! /bin/bash

#  $Id$
#  $URL$


rm -f smoketest.log lcd4linux

make distclean
./bootstrap

for driver in BeckmannEgle BWCT CrystalFontz Curses Cwlinux D4D EA232graphic G15 HD44780 IRLCD LCD2USB LCDLinux LCDTerm LEDMatrix LPH7508 LUIse M50530 MatrixOrbital MilfordInstruments Noritake NULL Pertelian PHAnderson picoLCD picoLCDGraphic PNG PPM RouterBoard Sample serdisplib SimpleLCD T6963 Trefon ULA200 USBHUB USBLCD WincorNixdorf X11; do

    make distclean
    ./configure --with-drivers=$driver
    make -s -j 2
    
    if [ -x lcd4linux ]; then
	echo "Success: drv_$driver" >>smoketest.log
    else
	echo "FAILED:  drv_$driver" >>smoketest.log
    fi
    
done

for plugin in apm asterisk button_exec cpuinfo diskstats dvb exec fifo file hddtemp i2c_sensors iconv imon isdn kvv loadavg meminfo mpd mysql netdev netinfo pop3 ppp proc_stat python sample seti statfs uname uptime w1retap wireless xmms; do

    make distclean
    ./configure --with-drivers=NULL --with-plugins=$plugin
    make -s -j 2
    
    if [ -x lcd4linux ]; then
	echo "Success: plugin_$plugin" >>smoketest.log
    else
	echo "FAILED:  plugin_$plugin" >>smoketest.log
    fi
    
done

make distclean
./configure
/* $Id: HD44780.c,v 1.12 2001/02/14 07:40:16 reinelt Exp $
 *
 * driver for display modules based on the HD44780 chip
 *
 * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: HD44780.c,v $
 * Revision 1.12  2001/02/14 07:40:16  reinelt
 *
 * first (incomplete) GPO implementation
 *
 * Revision 1.11  2001/02/13 12:43:24  reinelt
 *
 * HD_gpo() was missing
 *
 * Revision 1.10  2001/02/13 09:00:13  reinelt
 *
 * prepared framework for GPO's (general purpose outputs)
 *
 * Revision 1.9  2000/10/20 07:17:07  reinelt
 *
 *
 * corrected a bug in HD_goto()
 * Thanks to Gregor Szaktilla <gregor@szaktilla.de>
 *
 * Revision 1.8  2000/08/10 09:44:09  reinelt
 *
 * new debugging scheme: error(), info(), debug()
 * uses syslog if in daemon mode
 *
 * Revision 1.7  2000/08/09 09:50:29  reinelt
 *
 * opened 0.98 development
 * removed driver-specific signal-handlers
 * added 'quit'-function to driver structure
 * added global signal-handler
 *
 * Revision 1.6  2000/07/31 10:43:44  reinelt
 *
 * some changes to support kernel-2.4 (different layout of various files in /proc)
 *
 * Revision 1.5  2000/07/31 06:46:35  reinelt
 *
 * eliminated some compiler warnings with glibc
 *
 * Revision 1.4  2000/04/15 16:56:52  reinelt
 *
 * moved delay loops to udelay.c
 * renamed -d (debugging) switch to -v (verbose)
 * new switch -d to calibrate delay loop
 * 'Delay' entry for HD44780 back again
 * delay loops will not calibrate automatically, because this will fail with hich CPU load
 *
 * Revision 1.3  2000/04/15 11:13:54  reinelt
 *
 * added '-d' (debugging) switch
 * added several debugging messages
 * removed config entry 'Delay' for HD44780 driver
 * delay loop for HD44780 will be calibrated automatically
 *
 * Revision 1.2  2000/04/13 06:09:52  reinelt
 *
 * added BogoMips() to system.c (not used by now, maybe sometimes we can
 * calibrate our delay loop with this value)
 *
 * added delay loop to HD44780 driver. It seems to be quite fast now. Hopefully
 * no compiler will optimize away the delay loop!
 *
 * Revision 1.1  2000/04/12 08:05:45  reinelt
 *
 * first version of the HD44780 driver
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct LCD HD44780[]
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#ifdef HAVE_SYS_IO_H
#include <sys/io.h>
#else
#ifdef HAVE_ASM_IO_H
#include <asm/io.h>
#else
#error "neither sys/io.h nor asm/io.h found!"
#endif
#endif

#include "debug.h"
#include "cfg.h"
#include "display.h"
#include "udelay.h"

#define XRES 5
#define YRES 8
#define CHARS 8
#define BARS ( BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 )

typedef struct {
  int len1;
  int len2;
  int type;
  int segment;
} BAR;

typedef struct {
  int len1;
  int len2;
  int type;
  int used;
  int ascii;
} SEGMENT;

static LCD Lcd;
static unsigned short Port=0;

static char Txt[4][40];
static BAR  Bar[4][40];
static int  GPO=0;

static int nSegment=2;
static SEGMENT Segment[128] = {{ len1:0,   len2:0,   type:255, used:0, ascii:32 },
			       { len1:255, len2:255, type:255, used:0, ascii:255 }};

static void HD_command (unsigned char cmd, int delay)
{
  outb (cmd, Port);    // put data on DB1..DB8
  outb (0x02, Port+2); // set Enable = bit 0 invertet
  udelay (1);
  outb (0x03, Port+2); // clear Enable
  udelay (delay);
}

static void HD_write (char *string, int len, int delay)
{
  while (len--) {
    outb (*string++, Port); // put data on DB1..DB8
    outb (0x00, Port+2);    // set Enable = bit 0 invertet
    udelay (1);
    outb (0x01, Port+2);    // clear Enable
    udelay (delay);
  }
}

static void HD_setGPO (int bits)
{
  if (Lcd.gpos>0) {
    outb (bits, Port);    // put data on DB1..DB8
    outb (0x05, Port+2);  // set INIT = bit 2 invertet
    udelay (1);
    outb (0x03, Port+2);  // clear INIT
    udelay (1);
  }
}

static int HD_open (void)
{
  debug ("using port 0x%x", Port);
  if (ioperm(Port, 3, 1)!=0) {
    error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno));
    return -1;
  }

  HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms
  HD_command (0x30, 100);  // 8 Bit mode, wait 100 us
  HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms
  HD_command (0x38, 40);   // 8 Bit mode, 1/16 duty cycle, 5x8 font
  HD_command (0x08, 40);   // Display off, cursor off, blink off
  HD_command (0x0c, 1640); // Display on, cursor off, blink off, wait 1.64 ms
  HD_command (0x06, 40);   // curser moves to right, no shift
  return 0;
}

static void HD_process_bars (void)
{
  int row, col;
  int i, j;
  
  for (i=2; i<nSegment && Segment[i].used; i++);
  for (j=i+1; j<nSegment; j++) {
    if (Segment[j].used)
      Segment[i++]=Segment[j];
  }
  nSegment=i;
  
  for (row=0; row<Lcd.rows; row++) {
    for (col=0; col<Lcd.cols; col++) {
      if (Bar[row][col].type==0) continue;
      for (i=0; i<nSegment; i++) {
	if (Segment[i].type & Bar[row][col].type &&
	    Segment[i].len1== Bar[row][col].len1 &&
	    Segment[i].len2== Bar[row][col].len2) break;
      }
      if (i==nSegment) {
	nSegment++;
	Segment[i].len1=Bar[row][col].len1;
	Segment[i].len2=Bar[row][col].len2;
	Segment[i].type=Bar[row][col].type;
	Segment[i].used=0;
	Segment[i].ascii=-1;
      }
      Bar[row][col].segment=i;
    }
  }
}

static int HD_segment_diff (int i, int j)
{
  int RES;
  int i1, i2, j1, j2;
  
  if (i==j) return 65535;
  if (!(Segment[i].type & Segment[j].type)) return 65535;
  if (Segment[i].len1==0 && Segment[j].len1!=0) return 65535;
  if (Segment[i].len2==0 && Segment[j].len2!=0) return 65535;
  RES=Segment[i].type & BAR_H ? XRES:YRES;
  if (Segment[i].len1>=RES && Segment[j].len1<RES) return 65535;
  if (Segment[i].len2>=RES && Segment[j].len2<RES) return 65535;
  if (Segment[i].len1==Segment[i].len2 && Segment[j].len1!=Segment[j].len2) return 65535;

  i1=Segment[i].len1; if (i1>RES) i1=RES;
  i2=Segment[i].len2; if (i2>RES) i2=RES;
  j1=Segment[j].len1; if (j1>RES) i1=RES;
  j2=Segment[j].len2; if (j2>RES) i2=RES;
  
  return (i1-i2)*(i1-i2)+(j1-j2)*(j1-j2);
}

static void HD_compact_bars (void)
{
  int i, j, r, c, min;
  int pack_i, pack_j;
  int pass1=1;
  int deviation[nSegment][nSegment];
  
  if (nSegment>CHARS+2) {

    for (i=2; i<nSegment; i++) {
      for (j=0; j<nSegment; j++) {
	deviation[i][j]=HD_segment_diff(i,j);
      }
    }
    
    while (nSegment>CHARS+2) {
      min=65535;
      pack_i=-1;
      pack_j=-1;
      for (i=2; i<nSegment; i++) {
	if (pass1 && Segment[i].used) continue;
	for (j=0; j<nSegment; j++) {
	  if (deviation[i][j]<min) {
	    min=deviation[i][j];
	    pack_i=i;
	    pack_j=j;
	  }
	}
      }
      if (pack_i==-1) {
	if (pass1) {
	  pass1=0;
	  continue;
	} else {
	  error ("HD44780: unable to compact bar characters");
	  nSegment=CHARS;
	  break;
	}
      } 
      
      nSegment--;
      Segment[pack_i]=Segment[nSegment];
      
      for (i=0; i<nSegment; i++) {
	deviation[pack_i][i]=deviation[nSegment][i];
	deviation[i][pack_i]=deviation[i][nSegment];
      }
      
      for (r=0; r<Lcd.rows; r++) {
	for (c=0; c<Lcd.cols; c++) {
	  if (Bar[r][c].segment==pack_i)
	    Bar[r][c].segment=pack_j;
	  if (Bar[r][c].segment==nSegment)
	    Bar[r][c].segment=pack_i;
	}
      }
    }
  }
}

static void HD_define_chars (void)
{
  int c, i, j;
  char buffer[8];

  for (i=2; i<nSegment; i++) {
    if (Segment[i].used) continue;
    if (Segment[i].ascii!=-1) continue;
    for (c=0; c<CHARS; c++) {
      for (j=2; j<nSegment; j++) {
	if (Segment[j].ascii==c) break;
      }
      if (j==nSegment) break;
    }
    Segment[i].ascii=c;
    switch (Segment[i].type) {
    case BAR_L:
      for (j=0; j<4; j++) {
	char Pixel[] = { 0, 1, 3, 7, 15, 31 };
	buffer[j]=Pixel[Segment[i].len1];
	buffer[j+4]=Pixel[Segment[i].len2];
      }
      break;
    case BAR_R:
      for (j=0; j<4; j++) {
	char Pixel[] = { 0, 16, 24, 28, 30, 31 };
	buffer[j]=Pixel[Segment[i].len1];
	buffer[j+4]=Pixel[Segment[i].len2];
      }
      break;
    case BAR_U:
      for (j=0; j<Segment[i].len1; j++) {
	buffer[7-j]=31;
      }
      for (; j<YRES; j++) {
	buffer[7-j]=0;
      }
      break;
    case BAR_D:
      for (j=0; j<Segment[i].len1; j++) {
	buffer[j]=31;
      }
      for (; j<YRES; j++) {
	buffer[j]=0;
      }
      break;
    }
    HD_command (0x40|8*c, 40);
    HD_write (buffer, 8, 120); // 120 usec delay for CG RAM write
  }
}

int HD_clear (void)
{
  int row, col;

  for (row=0; row<Lcd.rows; row++) {
    for (col=0; col<Lcd.cols; col++) {
      Txt[row][col]='\t';
      Bar[row][col].len1=-1;
      Bar[row][col].len2=-1;
      Bar[row][col].type=0;
      Bar[row][col].segment=-1;
    }
  }
  GPO=0;
  HD_setGPO (GPO);         // All GPO's off
  HD_command (0x01, 1640); // clear display
  return 0;
}

int HD_init (LCD *Self)
{
  int rows=-1, cols=-1, gpos=-1;
  char *s, *e;
  
  s=cfg_get ("Port");
  if (s==NULL || *s=='\0') {
    error ("HD44780: no 'Port' entry in %s", cfg_file());
    return -1;
  }
  if ((Port=strtol(s, &e, 0))==0 || *e!='\0') {
    error ("HD44780: bad port '%s' in %s", s, cfg_file());
    return -1;
  }    

  s=cfg_get ("Delay");
  if (s==NULL || *s=='\0') {
    error ("HD44780: no 'Delay' entry in %s", cfg_file());
    return -1;
  }
  if ((loops_per_usec=strtol(s, &e, 0))==0 || *e!='\0') {
    error ("HD44780: bad delay '%s' in %s", s, cfg_file());
    return -1;
  }    
  
  s=cfg_get("Size");
  if (s==NULL || *s=='\0') {
    error ("HD44780: no 'Size' entry in %s", cfg_file());
    return -1;
  }
  if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
    error ("HD44780: bad size '%s'",s);
    return -1;
  }

  s=cfg_get ("GPOs");
  if (s==NULL) {
    gpos=0;
  }
  else if ((gpos=strtol(s, &e, 0))==0 || *e!='\0' || gpos<0 || gpos>8) {
    error ("HD44780: bad GPOs '%s' in %s", s, cfg_file());
    return -1;
  }    
  
  Self->rows=rows;
  Self->cols=cols;
  Self->gpos=gpos;
  Lcd=*Self;
  
  if (HD_open()!=0)
    return -1;
  
  HD_clear();
  
  return 0;
}

void HD_goto (int row, int col)
{
  int pos;

  pos=(row%2)*64+(row/2)*20+col;
  HD_command (0x80|pos, 40);
}

int HD_put (int row, int col, char *text)
{
  char *p=&Txt[row][col];
  char *t=text;
  
  while (*t && col++<=Lcd.cols) {
    *p++=*t++;
  }
  return 0;
}

int HD_bar (int type, int row, int col, int max, int len1, int len2)
{
  int rev=0;
  
  if (len1<1) len1=1;
  else if (len1>max) len1=max;
  
  if (len2<1) len2=1;
  else if (len2>max) len2=max;
  
  switch (type) {
  case BAR_L:
    len1=max-len1;
    len2=max-len2;
    rev=1;
    
  case BAR_R:
    while (max>0 && col<=Lcd.cols) {
      Bar[row][col].type=type;
      Bar[row][col].segment=-1;
      if (len1>=XRES) {
	Bar[row][col].len1=rev?0:XRES;
	len1-=XRES;
      } else {
	Bar[row][col].len1=rev?XRES-len1:len1;
	len1=0;
      }
      if (len2>=XRES) {
	Bar[row][col].len2=rev?0:XRES;
	len2-=XRES;
      } else {
	Bar[row][col].len2=rev?XRES-len2:len2;
	len2=0;
      }
      max-=XRES;
      col++;
    }
    break;

  case BAR_U:
    len1=max-len1;
    len2=max-len2;
    rev=1;
    
  case BAR_D:
    while (max>0 && row<=Lcd.rows) {
      Bar[row][col].type=type;
      Bar[row][col].segment=-1;
      if (len1>=YRES) {
	Bar[row][col].len1=rev?0:YRES;
	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 }
};