Hyundai 256 X 128 Library

Display Setup

Like most LCD Displays the Controller does not know what this display area is so the Control registers must be set up for the display to work properly. The datasheet goes over the General setup for the controller, some of the control data can be a bit confusing to figure out. So what I have here in the initialization for the Hyundai display, which creates a text screen and graphics overlay screen in the display's RAM space. This way if you want text only just write only to the text area, if you want graphics only write only to that area. Later on will work out using other display configurations and features.

LCD_write_cmd( 0x40 ); // System set commandLCD_write(0x30); // P1 use internal 8px char w/ no top line correctionLCD_write(0x87); // P2 8px width charLCD_write(0x07); // P3 8px height charLCD_write(0x1f); // P4 32 char per lineLCD_write(0x23); // P5 previous value + 4LCD_write(0x7f); // P6 128 pixel screen heightLCD_write(0x20); // P7 32 char per lineLCD_write(0x00); // P8
LCD_write_cmd(0x5d); // Set cursor typeLCD_write(0x04);LCD_write(0x86);LCD_write_cmd(0x4c); // Set direction of cursor movementLCD_write_cmd(0x5B); // Set display overlayLCD_write(0x08); //3
LCD_write_cmd(0x44); //Scroll - Set display start address and display regionsLCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);LCD_write(0x04);LCD_write(0x80);LCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);
LCD_write_cmd(0x5A); // Set horizontal scroll LCD_write(0x00);
LCD_write_cmd(0x59); // Display onLCD_write(0x16); // 06
LCD_clear();LCD_graphics_clear();LCD_set_cursor(0, 0);

sample C code:

This code sets up a text mode and a graphics overlay, see write routines for memory locations for start of text and start of graphics memory. All can be user defined.

// intialize displayLCD_write_cmd( 0x40 ); // System set commandLCD_write(0x30); // P1 use internal 8px char w/ no top line correctionLCD_write(0x87); // P2 8px width charLCD_write(0x07); // P3 8px height charLCD_write(0x1f); // P4 32 char per lineLCD_write(0x23); // P5 previous value + 4LCD_write(0x7f); // P6 128 pixel screen heightLCD_write(0x20); // P7 32 char per lineLCD_write(0x00); // P8

LCD_write_cmd(0x5d); // Set cursor typeLCD_write(0x04);LCD_write(0x86);LCD_write_cmd(0x4c); // Set direction of cursor movementLCD_write_cmd(0x5B); // Set display overlayLCD_write(0x08); //3

LCD_write_cmd(0x44); //Scroll - Set display start address and display regionsLCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);LCD_write(0x04);LCD_write(0x80);LCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);

LCD_write_cmd(0x5A); // Set horizontal scroll LCD_write(0x00);

LCD_write_cmd(0x59); // Display onLCD_write(0x16); // 06
LCD_clear();LCD_graphics_clear();LCD_set_cursor(0, 0);

Simple library routines:

/* Hyundai_256x128.h 256 X 128 LCD Grapics display Hyundai #HG25504 sold by All Electronics. By Eric Stringer 2017*/

#define SCREEN_SIZE_X 256#define SCREEN_SIZE_Y 128#define GRAPHICS_MEMORY_LSB 0xb0#define GRAPHICS_MEMORY_MSB 0x04

void LCD_write_cmd( unsigned char a );void LCD_write( unsigned char a );unsigned char LCD_read_flag( void );unsigned char LCD_read_data( void ); void LCD_clear(void);void LCD_graphics_clear(void);void LCD_print( char *ptr ); void LCD_print_char( char a );void LCD_set_cursor(char x, char y);void LCD_set_graphics_cursor(char col, char row);void LCD_pixel(int x, int y, char bit);void LCD_draw_line(int x0, int y0, int x1, int y1, char bit);

******************************************************

/* Hyundai_256x128.c 256 X 128 LCD Grapics display Hyundai #HG25504 sold by All Electronics. By Eric Stringer 2017*/

#include "Hyundai_256x128.h"#include "Z80_IO.h"#include <z80.h>#include <stdlib.h>

void LCD_write_cmd( unsigned char a ){// Code is for Z80 LCD at address 0x20// This is where you would change code to write a command // to LCD via your interface configuration //
//delay(20);
z80_outp( 0x61, a); //LCD address ;
}
void LCD_write( unsigned char a ) {// Code is for Z80 LCD at address 0x20// This is where you would change code to write // to LCD via your interface configuration // //delay(10);
z80_outp( 0x60, a ); // LCD address;
}
unsigned char LCD_read_data( void ) {unsigned char a; // Code is for Z80 LCD at address 0x20// This is where you would change code to write // to LCD via your interface configuration // LCD_write_cmd( 0x43 );a = z80_inp(0x61); // LCD address ;

return a;}
unsigned char LCD_read_flag( void ) {unsigned char a; // Code is for Z80 LCD at address 0x20// This is where you would change code to write // to LCD via your interface configuration //
a = z80_inp(0x60); // LCD address ;
return a;}

void LCD_clear(void){int i;
LCD_write_cmd(0x46); // set the cursor addrLCD_write(0x00);LCD_write(0x00);LCD_write_cmd(0x4c);LCD_write_cmd(0x42); for (i=0; i<1024; i++){LCD_write(0x20); // write blank spaces} LCD_write_cmd(0x46);LCD_write(0x00);LCD_write(0x00);}
void LCD_graphics_clear(void){int i;
LCD_write_cmd(0x46); // set the cursor addrLCD_write(0xb0);LCD_write(0x04);LCD_write_cmd(0x4c);LCD_write_cmd(0x42); for (i=0; i<0x1000; i++){LCD_write(0x00); // write blank spaces} LCD_write_cmd(0x46);LCD_write(0x00);LCD_write(0x00);}
void LCD_print_char( char a ) { LCD_write_cmd(0x42); LCD_write( a );
}

void LCD_print( char *ptr ) { LCD_write_cmd(0x42); while ( *ptr != '\0' ){LCD_write( *ptr++ );}
}
void LCD_set_cursor(char col, char row){char lowadd, hiadd; int t_add;
// our display 32 X 24// text display starts at 0x0000
t_add = row * 32 + col;lowadd = t_add & 0x00ff;hiadd = t_add >> 8;
LCD_write_cmd(0x46); // Set cursor addressLCD_write(lowadd);LCD_write(hiadd); }
void LCD_set_graphics_cursor(char col, char row){char lowadd, hiadd; int t_add;
// our display 32 X 24// text display starts at 0x0000
t_add = (row * 32 + col) + 0x04b0;lowadd = t_add & 0x00ff;hiadd = t_add >> 8;
LCD_write_cmd(0x46); // Set cursor addressLCD_write(lowadd);LCD_write(hiadd); }

void LCD_pixel(int x, int y, char bit){int row, col, data, t;
col = x >> 3;row = y;LCD_set_graphics_cursor( col, row);t = LCD_read_data( );
if (bit == 0) { // mask ^ data data = ~(0x80 >> (x%8)) & t; } else { // mask | data data = (0x80 >> (x%8)) | t; } LCD_set_graphics_cursor( col, row);LCD_write_cmd(0x42);LCD_write( data );}
void LCD_draw_line(int x0, int y0, int x1, int y1, char bit){int sx, sy, dx, dy, err, e2; dx = abs(x1-x0), sx = x0<x1 ? 1 : -1;dy = abs(y1-y0), sy = y0<y1 ? 1 : -1; err = (dx>dy ? dx : -dy)/2, e2; for(;;){ LCD_pixel(x0,y0, bit); if (x0==x1 && y0==y1) break; e2 = err; if (e2 >-dx) { err -= dy; x0 += sx; } if (e2 < dy) { err += dx; y0 += sy; } }}

Sample Program

/* Display library Demo

#include "Z80_IO.h"#include <z80.h>#include "Hyundai_256x128.h"#include <stdlib.h>

void system_init(void);

int main(){ system_init();
LCD_set_cursor(0 , 0);LCD_print("System test\0");

return 0;}

void system_init(void){
// intialize displayLCD_write_cmd( 0x40 ); // System set commandLCD_write(0x30); // P1 use internal 8px char w/ no top line correctionLCD_write(0x87); // P2 8px width charLCD_write(0x07); // P3 8px height charLCD_write(0x1f); // P4 32 char per lineLCD_write(0x23); // P5 previous value + 4LCD_write(0x7f); // P6 128 pixel screen heightLCD_write(0x20); // P7 32 char per lineLCD_write(0x00); // P8

LCD_write_cmd(0x5d); // Set cursor typeLCD_write(0x04);LCD_write(0x86);LCD_write_cmd(0x4c); // Set direction of cursor movementLCD_write_cmd(0x5B); // Set display overlayLCD_write(0x08); //3

LCD_write_cmd(0x44); //Scroll - Set display start address and display regionsLCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);LCD_write(0x04);LCD_write(0x80);LCD_write(0x00);LCD_write(0x00);LCD_write(0x80);LCD_write(0xb0);

LCD_write_cmd(0x5A); // Set horizontal scroll LCD_write(0x00);

LCD_write_cmd(0x59); // Display onLCD_write(0x16); // 06
LCD_clear();LCD_graphics_clear();LCD_set_cursor(0, 0);

}

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