=====Optrex-Display=====

June, 10 th 2004

Software for optrex DMF50151AA LC-Display for Linux

Display type: DMF50151AA LC-Display with Toshiba T6369 Displaycontroller 

{{image url="images/optrex1.jpg"}}

How to use this software?

1. Connect your Optrex Display to LPT1 as shown in your Optrex manual.
2. Copy the optrex binary to /sbin/ (Note, you can use this program only as root)
3. Just use pipes to forward character streams of command-line-based programs to you display.

Example:
%%(bash)linux> echo Hello World! | optrex%%

An example to this picture above:
%%(bash)linux> df -h | awk '{print $1, $4}' | optrex%%


But use this program with care. You should know, what you're doing.
This is a dangerous piece of code using low-level access to the memory. No guaranty for anything!


Sourcecode for Linux gcc

%%(c)

/*********************************************************
 * Optrex DMF50151AA LC-Display-Testprogram              *
 * for Toshiba T6369 Displaycontroller                   *
 * Copyright (c) Andreas Tobola                          *
 * http://www.root0.com                                  *
 * 10.06.2004                                            *
 * Sourcecode for Linux gcc                              *
 *********************************************************/

#include <asm/io.h>
#include <unistd.h>
#include <stdio.h>

#define GRAPH_RES_X   160
#define GRAPH_RES_Y   128
#define TEXT_RES_X     20
#define TEXT_RES_Y     16
#define FONT_WIDTH      8

#define BUF 4096
//8192

const int dport = 888;

//#define cDispType    'DMF50151AA'


/**
 * Verzögerung 
 */
void delay_sw() {

   long i;
   for(i=0; i<10; i++){
	  /*i++;
	  i--;*/
	}
   /*Nothing */;

}


/**
 * Write data to display data register
 */
void WriteData(int d) {

  delay_sw(); //Instead of WaitDispRdy;
  outb(d,dport);
  outb(0,dport+2); // C/D = L (Data)
  outb(2,dport+2); // CE
  outb(3,dport+2); // CE+WR
  outb(2,dport+2); // CE
  outb(0,dport+2);
}


/**
 * Write data to display control register
 */
void WriteCtrl(int d) {

  delay_sw(); //Instead of WaitDispRdy;
  outb(d,dport);
  outb(4,dport+2); // C/D = H (ctrl)
  outb(4+2,dport+2); // CE
  outb(4+3,dport+2); // CE+WR
  outb(4+2,dport+2); // CE
  outb(0,dport+2);
}





/**
 * Display initialization
 */
void display_init() {


  int i=0;
  WriteData(0);
  WriteData(0);
  WriteCtrl(0x40); // Text Home @ 0000h
  WriteData(TEXT_RES_X);
  WriteData(0);
  WriteCtrl(0x41); // Text Area
  WriteData(0);
  WriteData(2);
  WriteCtrl(0x42); // Graph Home @ 0200h
  WriteData(TEXT_RES_X);
  WriteData(0);
  WriteCtrl(0x43); // Gr Area
  WriteCtrl(0x80); // OR Mode
  WriteCtrl(0x9F);

  WriteData(2);
  WriteData(0);
  WriteCtrl(0x22); // CG RAM Start ab Adresse 4096 = 1000h


}


/**
 * Clear display screen
 */
void display_clear() {

   int i;

   // Clear text
   WriteData(0);
   WriteData(0);
   WriteCtrl(0x24);
   for (i=0; i<=((TEXT_RES_Y*TEXT_RES_X)-1); i++) {
	WriteData(0);
	WriteCtrl(0xC0);
   }

   // Clear graphic
   WriteData(0);
   WriteData(2);
   WriteCtrl(0x24);
   for (i=0; i<=((GRAPH_RES_Y*((GRAPH_RES_X+(FONT_WIDTH-1))/FONT_WIDTH))-1); i++) {
	WriteData(0);
	WriteCtrl(0xC0);
   }
}

/**
 * Set cursor position
 */
void setCursor(int line, int row) {

  if (line>TEXT_RES_Y)
	  line = TEXT_RES_Y;
  if (row>TEXT_RES_X)
	  row = TEXT_RES_X;

  WriteData(line);
  WriteData(row);
  WriteCtrl(0x21);

}


/**
 * Write string
 */
void writeString(char txt[]) {

  int z;
  int row;
  char sameChar;

  sameChar = '\0';

  WriteData(0);
  WriteData(0);
  WriteCtrl(0x24);

  row=0;

  for (z=0; z<strlen(txt); z++) {


	while (txt[z]==sameChar) {
	  z++;
	}
	sameChar = '\0';


	//Write line feeds
	if (txt[z]=='\n') {
		while (row<TEXT_RES_X) {
		  row++;
		  WriteData(' '-32);
		  WriteCtrl(0xC0);
		}
		sameChar = '\n';
		row--;

	} else {
	// Write other chars
	WriteData(txt[z]-32);
	WriteCtrl(0xC0);

	if (txt[z]==' ')
	  sameChar=' ';

	}


	//printf("%i\n",txt[z]);
	row++;
	row=row % TEXT_RES_X;


  }

}



/**
 * Main method
 */
main(int argc, char* argv[]) {

   char puffer[BUF];
   char inhalt[BUF];

   if (ioperm(dport,3,1) < 0) {
	  perror("Cannot access the parallel port\n");
	  exit(1);
   }

   display_init();
   display_clear();
   setCursor(0,0);


	 inhalt[0]='\0';
	 while(fgets(puffer,BUF,stdin) != NULL){
	   strcat(inhalt,puffer);
	 }

   //writeString(argv[1]);
   writeString(inhalt);

   ioperm(dport,3,0);

   exit(0);

}

%%




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