#include<mega16.h>
#include<delay.h>
#define xtal 1000000
unsigned char key;
int i;
char buffer[2]; 
#asm
.equ__lcd_port=0X1B;PORTA
#endasm
#include<lcd.h>
#include<stdio.h>
flash char keytable[16]={0xee,0xed,0xeb,0xe7,0xde,0xdd,0xdb,0xd7,0xbe,0xbd,0xbb,0xb7,0x7e,0x7d,0x7b,0x77};
void main(void)
{
DDRB=0XFF;
PORTB=0XFF;
while(1)
{ 
int butnum=0;
DDRB=0X0F;
PORTB=0XF0;
delay_us(5);
key=PINB;
delay_us(10);
DDRB=0XF0;
PORTB=0X0F;
delay_us(5);
key=PINB|key;
if(key!=0XFF)
{
for(i=0;i<16;i++)
{
if(key==keytable[i])
{
butnum=i+1;
break;
}
}
}
if(butnum!=0)
{
lcd_clear();
lcd_gotoxy(0,0);
sprintf(buffer,"%2u",butnum);
lcd_puts(buffer);
delay_ms(1000);
}
}
}