#define F_CPU 16000000UL
#include 
#include 
#include 
#include 
#include 
//
#define LCD_DATA_DIR    DDRB
#define LCD_DATA_PORT   PORTB
#define LCD_CTRL_DIR    DDRB
#define LCD_CTRL_PORT   PORTB

#define RIGHT 1
#define LEFT  2
#define ON    1
#define OFF   2
#define NO    0

#define LCD_E_HIGH   (LCD_CTRL_PORT|=0x02)
#define LCD_E_LOW    (LCD_CTRL_PORT&=0xfd)
#define LCD_RS_HIGH  (LCD_CTRL_PORT|=0x01)
#define LCD_RS_LOW   (LCD_CTRL_PORT&=0xfe)
//
void E_pulse(void){ LCD_E_HIGH; _delay_us(40); LCD_E_LOW; _delay_us(40); }
void Command_set4(char s){
  LCD_RS_LOW;
  LCD_DATA_PORT=(s&0xf0); E_pulse();
  LCD_DATA_PORT=(s<<0x4); E_pulse(); _delay_ms(3);
}
void Data_set4(char s){
  LCD_RS_HIGH;
  LCD_DATA_PORT=(s&0xf0)|1; E_pulse();
  LCD_DATA_PORT=(s<<0x4)|1; E_pulse();
}
void clrscr4(void){ Command_set4(0x01); }
void cursor_at4(char x, char y){
  switch(y){
    case 0: y=0x80; break;
    case 1: y=0xc0; break;
    case 2: y=0x94; break;
    case 3: y=0xd4; break;
  }
  y=y+x; Command_set4(y);
}
void writeString_lcd4(char x, char y, char *s){ cursor_at4(x,y); while(*s)Data_set4(*s++); }
void cursor_home4 (void){ Command_set4(0x02); _delay_ms(5); }
void move_display4(char p){ if(p==LEFT)Command_set4(0x18); if(p==RIGHT)Command_set4(0x1c); }
void move_cursor4 (char p){ if(p==LEFT)Command_set4(0x10); if(p==RIGHT)Command_set4(0x14); }
void Entry_shift4 (char p){
 if(p==LEFT )Command_set4(0x07);
 if(p==RIGHT)Command_set4(0x05);
 if(p==NO   )Command_set4(0x06);
}
void display_onoff4(unsigned char d, unsigned char c, unsigned char b){
 unsigned char display=0x08;
 if(d==ON)d=0x04; else d=0x02;
 if(c==ON)d=0x02; else d=0x00;
 if(b==ON)d=0x01; else d=0x00;
 display=display|d|c|b; Command_set4(display);
}
void init_lcd4(void){
  LCD_DATA_PORT=0xff;
  //Command_set4(0x20);
  Command_set4(0x28); Command_set4(0x06); Command_set4(0x0C);
  clrscr4();
}
//
int main(void){
  unsigned char interruptNo=0;
  char msg[30];
  DDRB=0xff; PORTE=0xf0;
  init_lcd4();
  writeString_lcd4(0,0,"interrupt No: ");
  EICRB=0xFF; EIMSK=0xf0; // SREG=0x80;
  while(1){
    interruptNo=EIFR;
    if(interruptNo){
      switch(interruptNo){
        case 0x10: interruptNo=4; EIFR|=0x10; break;
        case 0x20: interruptNo=5; EIFR|=0x20; break;
        case 0x40: interruptNo=6; EIFR|=0x40; break;
        case 0x80: interruptNo=7; EIFR|=0x80; break; 
      }
      sprintf(msg," %4d checked ",interruptNo);
      interruptNo=0;
      writeString_lcd4(0,1,msg);
    }
  }
}