/*****************************************************
Project :gate simulator 
Version :1.0 
Date    : 2008/02/15
Author  : rasool                          
Company : shiri                           

Chip type           : ATmega16
Program type        : Application
Clock frequency     : 8.000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*****************************************************/

#include <mega16.h>
#include <delay.h>
#include <stdio.h>
#asm
   .equ __lcd_port=0x1B ;PORTA
#endasm
#include <lcd.h>

void main(void)
{

char display1[16];
char display2[16];
char f[5];
bit y=0,d=1,n=0;
int flag=0;

PORTA=0x08;
DDRA=0x08;

PORTD=0x00;
DDRD=0x40;

lcd_init(16);

while (1)
      {
      delay_ms(350);
      if(PIND.3==1)
      	{
       		delay_ms(100);
       		if(PIND.3==1)
       		flag++;
       		if (flag>7)
       		flag=7;
      	
      	}
      if(PIND.2==1)
      	{
       		delay_ms(100);
      		if(PIND.2==1)
       		flag--;
       		if (flag<1)
       		flag=1;
      	}
      	
        switch (flag) {
         case 0:
                {       
                        if (d==1)
                        {
                                lcd_clear();
                                lcd_putsf(" gate simulator ");
                                lcd_gotoxy(0,1);
                                lcd_putsf("  ali  heydari  ");
                                d=0;
                        }
                break;
                }
         case 1:
                {
                y=PINB.0&PINB.1;
                sprintf(f,"and");
                d=1;
                break;
                }
         case 2:
                {
                y=PINB.0|PINB.1;
                sprintf(f,"or"); 
                d=1;
                break;
                }
         case 3:
                {
                y=PINB.0^PINB.1; 
                sprintf(f,"xor"); 
                d=1;
                break;
                }
         case 4:
                {
                y=PINB.0&PINB.1;
                y=~y;
                sprintf(f,"nand");  
                d=1;
                break;
                }
         case 5: 
                {
                y=PINB.0|PINB.1;
                y=~y;
                sprintf(f,"nor");
                d=1;
                break;
                }
         case 6: 
                {
                y=PINB.0^PINB.1;
                y=~y;
                sprintf(f,"xnor");
                d=1;
                break;
                }
         case 7: 
                {
                y=~PINB.0;
                sprintf(f,"not");   
                d=1;
                n=1;
                break;
                }
         
    };
      if (d==1)
      { 
        PORTD.6=y;
        lcd_clear();
        sprintf(display1,"f%i= %s mode ",flag,f);
        lcd_puts(display1);
        lcd_gotoxy(0,1);
        if (n==0)sprintf(display2,"x=%i , y=%i , f=%i",PINB.0,PINB.1,y);
        if (n==1)
                {
                        sprintf(display2,"x=%i    ,    f=%i",PINB.0,y);
                        n=0;
                }
        lcd_puts(display2);
        d=0;
      }

      };
}