/* $Id: M50530.c,v 1.15 2003/09/11 04:09:53 reinelt Exp $ * * driver for display modules based on the M50530 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: M50530.c,v $ * 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 8static 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 }};