Hi Ibnu,

Here is some sample code for a test program I created to display a menu. It is for a 2 row matrix display with a up, down, left, right and enter key. I hope this helps you building your own menu program. You will have to modify the GetKey() and probably other functions to fit your hardware.

Greetings,
Dennis.

Ps, you might check out my FREE 8051 SDK and State machine generator at rd.kaut.nl (click free software in the menu). The LCD and PIA functions are based on this SDK.

/**
 * @file Menu.c
 *
 * This displays a menu structure on a 4 line LCD display
 *
 */
 
//#define PC 
 
#define LEFTKEY 	0x0a
#define RIGHTKEY	0x0b
#define UPKEY		0x0c
#define DOWNKEY		0x0d
#define ENTERKEY	0x0e

#define MAINMENU	0x10
#define TIMEMENU	0x20	
#define DATEMENU	0x30
#define SETTIMEMENU 0x40

#include <reg52.h>
#include <stdio.h>
#include "../../src/uniboard.h"
#include "../../src/lcd.h"
#include "../../src/pia.h"
#include "../../src/i2c.h"
#include "../../src/rtclock.h"

unsigned char x;
unsigned char y;
unsigned int IRVal = 0;		///< Contains ths received IR value if valid
unsigned char bitCount = 0;	///< Counts the number of bits received per command
bit IRValid = 0;        	///< status bit if the received byte is valid
sbit IRscan = P3^3;    		///< IR receiver pin


unsigned char hours=0, minutes=0, seconds=0,  h_seconds=0;


code char displaytitle[4][17] =
							{
								{"...Main Menu...0"},
								{"...Time Menu...1"},
								{"...Bla  Menu..10"},
								{"...Set Time..1.1"}
							};

#define MAXMAINITEMS 10
code char displayMainItem [MAXMAINITEMS][17]=
							{
								{"[  Time Menu 1 >"},
								{"<  Menu 2      >"},
								{"<  Menu 3      >"},
								{"<  Menu 4      >"},
								{"<  Menu 5      >"},
								{"<  Games!!!  6 >"},
								{"<  Menu 7      >"},
								{"<  Menu 8      >"},
								{"<  Menu 9      >"},
								{"<  Bla menu 10 ]"}
							};

code char displayTimeItem [2][17] =
							{
								{"[  Set Time    >"},
								{"<  Set Date    ]"}
							};

code char displayDateItem [2][17] =
							{
								{"[  bla bla 1   >"},
								{"<  bla bla 2   ]"}
							};


void DisplayMenu(unsigned char menu, unsigned char item, unsigned char cursorpos);
void Menu(unsigned char key);
unsigned char decodeIR(unsigned int value);




void Menu(unsigned char key)
{
	static unsigned char menu = MAINMENU;
	static unsigned char item = 0;
	static unsigned char subState=0;

	 
	switch(menu+key)
	{
		case MAINMENU+LEFTKEY:	if (item>0)item--; else item=MAXMAINITEMS-1; break;
		case MAINMENU+RIGHTKEY: if (item<MAXMAINITEMS-1)item++; else item=0; break;
		case MAINMENU+ENTERKEY: if      (item == 0){menu = TIMEMENU; item=0;}
								else if (item == 9){menu = DATEMENU; item=0;}
								break;
								
	 	case TIMEMENU+LEFTKEY:	item = 0; break;
		case TIMEMENU+RIGHTKEY: item = 1; break;
	 	case TIMEMENU+UPKEY:	menu = MAINMENU; item = 0; break;
	 	case TIMEMENU+ENTERKEY: if (item==0){ menu = SETTIMEMENU; item=0; } break;

	 	case DATEMENU+UPKEY:	menu = MAINMENU; item = 9; break;
		case DATEMENU+LEFTKEY:	item = 0; break;
		case DATEMENU+RIGHTKEY: item = 1; break;	
		

		case SETTIMEMENU+ENTERKEY:	menu=TIMEMENU; item=0; subState = 0; x=1; y=1; break; 	
		case SETTIMEMENU+UPKEY: if (subState==0 && hours   < 23) hours++; 
								if (subState==1 && minutes < 59) minutes++; 
								if (subState==2 && seconds < 59) seconds++; 
								break;
		case SETTIMEMENU+DOWNKEY: if (subState==0 && hours > 0) hours--;
								if (subState==1 && minutes > 0) minutes--; 
								if (subState==2 && seconds > 0) seconds--; 
								break;
		case SETTIMEMENU+RIGHTKEY: if( subState < 2) subState++; break;
		case SETTIMEMENU+LEFTKEY:  if( subState > 0) subState--; break;

	 	default: break;
	}
									
	DisplayMenu(menu,item,subState);						 
}



/**
 * this function displays what has to be displayed on the display.
 */
void DisplayMenu(unsigned char menu, unsigned char item, unsigned char cursorpos)
{
	SetCursorXYLCD(1,3);
	SetStringLCD(displaytitle[(menu/16)-1]);
	SetCursorXYLCD(1,4);
	switch(menu)
	{
		case MAINMENU:	SetStringLCD(displayMainItem[item]); break;
		case TIMEMENU:	SetStringLCD(displayTimeItem[item]); break;
		case DATEMENU:	SetStringLCD(displayDateItem[item]); break;	
		case SETTIMEMENU: 	FormatLCD("  %B02u:%B02u:%B02u      ",hours,minutes,seconds) ; 
							if (cursorpos==0){SetCursorXYLCD(4,4); x=4; y=4;}
							if (cursorpos==1){SetCursorXYLCD(7,4); x=7; y=4;}
							if (cursorpos==2){SetCursorXYLCD(10,4); x=10; y=4;}
							SetTime(hours,minutes,seconds, h_seconds);
							break;	
	}
}

void Delay(unsigned int time)
{
	while(time) time--;
}


unsigned char GetKey()
{
	unsigned char ch;
	static unsigned char state=1;

	Delay(1000);

	if(IRValid)
	{
		return decodeIR(IRVal);
	}	

	ch = GetPIA(PIA_PORT_C);	
	switch(ch)
		{
			case ~0x02: if(state == 1){ state = 0; return LEFTKEY;} else break;
			case ~0x01: if(state == 1){ state = 0; return RIGHTKEY;} else break;
			case ~0x08: if(state == 1){ state = 0; return UPKEY;} else break;
			case ~0x04: if(state == 1){ state = 0; return DOWNKEY;} else break;
			case ~0x10: if(state == 1){ state = 0; return ENTERKEY;} else break;
			case  0xff: if (state == 0) state = 1; break;
		}
	
	return 0;


}


void main()
{
	unsigned char ch;
	unsigned char old_Sec;
	ResetPIA();
	ControlPIA(PIA_PORT_C_LOW, PIA_INPUT, PIA_MODE_0);
	ControlPIA(PIA_PORT_C_HIGH, PIA_INPUT, PIA_MODE_0);
	InitLCD();
	ClearLCD();	
	Menu(0);
	while(1)
	{
		ch = GetKey();
		if (ch != 0) Menu(ch);
	}
}