/* $Id: M50530.c,v 1.16 2003/10/05 17:58:50 reinelt Exp $
*
* driver for display modules based on the M50530 chip
*
* Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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.
*
* LCD4Linux 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: M50530.c,v $
* Revision 1.16 2003/10/05 17:58:50 reinelt
* libtool junk; copyright messages cleaned up
*
* Revision 1.15 2003/09/11 04:09:53 reinelt
* minor cleanups
*
* Revision 1.14 2003/09/10 03:48:22 reinelt
* Icons for M50530, new processing scheme (Ticks.Text...)
*
* Revision 1.13 2003/09/09 06:54:43 reinelt
* new function 'cfg_number()'
*
* Revision 1.12 2003/08/24 05:17:58 reinelt
* liblcd4linux patch from Patrick Schemitz
*
* Revision 1.11 2003/08/16 07:31:35 reinelt
* double buffering in all drivers
*
* Revision 1.10 2003/08/15 07:54:07 reinelt
* HD44780 4 bit mode implemented
*
* Revision 1.9 2003/07/24 04:48:09 reinelt
* 'soft clear' needed for virtual rows
*
* Revision 1.8 2003/04/07 06:02:59 reinelt
* further parallel port abstraction
*
* Revision 1.7 2003/04/04 06:01:59 reinelt
* new parallel port abstraction scheme
*
* Revision 1.6 2003/02/22 07:53:10 reinelt
* cfg_get(key,defval)
*
* Revision 1.5 2002/08/19 10:51:06 reinelt
* M50530 driver using new generic bar functions
*
* Revision 1.4 2002/08/19 07:36:29 reinelt
*
* finished bar.c, USBLCD is the first driver that uses the generic bar functions
*
* Revision 1.3 2002/08/19 04:41:20 reinelt
* introduced bar.c, moved bar stuff from display.h to bar.h
*
* Revision 1.2 2002/04/30 07:20:15 reinelt
*
* implemented the new ndelay(nanoseconds) in all parallel port drivers
*
* Revision 1.1 2001/09/11 05:31:37 reinelt
* M50530 driver
*
*
*/
/*
*
* exported fuctions:
*
* struct LCD M50530[]
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "debug.h"
#include "cfg.h"
#include "display.h"
#include "bar.h"
#include "icon.h"
#include "parport.h"
#include "udelay.h"
#define XRES 5
#define YRES 8
#define CHARS 8
static LCD Lcd;
static int GPO=0;
static int Icons;
static char *FrameBuffer1=NULL;
static char *FrameBuffer2=NULL;
static unsigned char SIGNAL_EX;
static unsigned char SIGNAL_IOC1;
static unsigned char SIGNAL_IOC2;
static unsigned char SIGNAL_GPO;
static void M5_command (unsigned int cmd, int delay)
{
// put data on DB1..DB8
parport_data (cmd&0xff);
// set I/OC1 (Select inverted)
// set I/OC2 (AutoFeed inverted)
parport_control (SIGNAL_IOC1|SIGNAL_IOC2,
(cmd&0x200?SIGNAL_IOC1:0) |
(cmd&0x100?SIGNAL_IOC2:0));
// Control data setup time
ndelay(200);
// send command
// EX signal pulse width = 500ns
// Fixme: why 500 ns? Datasheet says 200ns
parport_toggle (SIGNAL_EX, 1, 500);
// wait
udelay(delay);
}
static void M5_write (unsigned char *string, int len)
{
unsigned int cmd;
while (len--) {
cmd=*string++;
M5_command (0x100|cmd, 20);
}
}
static void M5_setGPO (int bits)
{
if (Lcd.gpos>0) {
// put data on DB1..DB8
parport_data (bits);
// 74HCT573 set-up time
ndelay(20);
// send data
// 74HCT573 enable pulse width = 24ns
parport_toggle (SIGNAL_GPO, 1, 24);
}
}
static void M5_define_char (int ascii, char *buffer)
{
M5_command (0x300+192+8*ascii, 20);
M5_write (buffer, 8);
}
int M5_clear (int full)
{
memset (FrameBuffer1, ' ', Lcd.rows*Lcd.cols*sizeof(char));
icon_clear();
bar_clear();
GPO=0;
if (full) {
memset (FrameBuffer2, ' ', Lcd.rows*Lcd.cols*sizeof(char));
M5_command (0x0001, 1250); // clear display
M5_setGPO (GPO); // All GPO's off
}
return 0;
}
int M5_init (LCD *Self)
{
int rows=-1, cols=-1, gpos=-1;
char *s;
s=cfg_get("Size",NULL);
if (s==NULL || *s=='\0') {
error ("M50530: no 'Size' entry in %s", cfg_source());
return -1;
}
if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
error ("M50530: bad size '%s'",s);
return -1;
}
if (cfg_number("GPOs", 0, 0, 8, &gpos)<0) return -1;
Self->rows=rows;
Self->cols=cols;
Self->gpos=gpos;
Lcd=*Self;
// Init the framebuffers
FrameBuffer1 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
FrameBuffer2 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
if (FrameBuffer1==NULL || FrameBuffer2==NULL) {
error ("HD44780: framebuffer could not be allocated: malloc() failed");
return -1;
}
if ((SIGNAL_EX = parport_wire_ctrl ("EX", "STROBE"))==0xff) return -1;
if ((SIGNAL_IOC1 = parport_wire_ctrl ("IOC1", "SELECT"))==0xff) return -1;
if ((SIGNAL_IOC2 = parport_wire_ctrl ("IOC2", "AUTOFD"))==0xff) return -1;
if ((SIGNAL_GPO = parport_wire_ctrl ("GPO", "INIT") )==0xff) return -1;
if (parport_open() != 0) {
error ("M50530: could not initialize parallel port!");
return -1;
}
// set direction: write
parport_direction (0);
// initialize display
M5_command (0x00FA, 20); // set function mode
M5_command (0x0020, 20); // set display mode
M5_command (0x0050, 20); // set entry mode
M5_command (0x0030, 20); // set display mode
if (cfg_number("Icons", 0, 0, CHARS, &Icons)<0) return -1;
if (Icons>0) {
debug ("reserving %d of %d user-defined characters for icons", Icons, CHARS);
icon_init(Lcd.rows, Lcd.cols, XRES, YRES, CHARS, Icons, M5_define_char);
Self->icons=Icons;
Lcd.icons=Icons;
}
bar_init(rows, cols, XRES, YRES, CHARS-Icons);
bar_add_segment(0,0,255,32); // ASCII 32 = blank
M5_clear(1);
return 0;
}
void M5_goto (int row, int col)
{
int pos;
pos=row*48+col;
if (row>3) pos-=168;
M5_command (0x300|pos, 20);
}
int M5_put (int row, int col, char *text)
{
char *p=FrameBuffer1+row*Lcd.cols+col;
char *t=text;
while (*t && col++<=Lcd.cols) {
*p++=*t++;
}
return 0;
}
int M5_bar (int type, int row, int col, int max, int len1, int len2)
{
return bar_draw (type, row, col, max, len1, len2);
}
int M5_icon (int num, int seq, int row, int col)
{
return icon_draw (num, seq, row, col);
}
int M5_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 M5_flush (void)
{
int row, col, pos1, pos2;
int c, equal;
bar_process(M5_define_char);
for (row=0; row<Lcd.rows; row++) {
for (col=0; col<Lcd.cols; col++) {
c=bar_peek(row, col);
if (c==-1) c=icon_peek(row, col);
if (c!=-1) {
if (c!=32) c+=248; //blank
FrameBuffer1[row*Lcd.cols+col]=(char)c;
}
}
for (col=0; col<Lcd.cols; col++) {
if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) continue;
M5_goto (row, col);
for (pos1=col++, pos2=pos1, equal=0; col<Lcd.cols; col++) {
if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) {
// If we find just one equal byte, we don't break, because this
// would require a goto, which takes one byte, too.
if (++equal>2) break;
} else {
pos2=col;
equal=0;
}
}
M5_write (FrameBuffer1+row*Lcd.cols+pos1, pos2-pos1+1);
}
}
memcpy (FrameBuffer2, FrameBuffer1, Lcd.rows*Lcd.cols*sizeof(char));
M5_setGPO(GPO);
return 0;
}
int M5_quit (void)
{
info("M50530: shutting down.");
if (FrameBuffer1) {
free(FrameBuffer1);
FrameBuffer1=NULL;
}
if (FrameBuffer2) {
free(FrameBuffer2);
FrameBuffer2=NULL;
}
return parport_close();
}
LCD M50530[] = {
{ name: "M50530",
rows: 0,
cols: 0,
xres: XRES,
yres: YRES,
bars: BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
icons: 0,
gpos: 0,
init: M5_init,
clear: M5_clear,
put: M5_put,
bar: M5_bar,
icon: M5_icon,
gpo: M5_gpo,
flush: M5_flush,
quit: M5_quit
},
{ NULL }
};