void keypad_init(void)  
{
	P0M1 |= 0x03;
  	P0M2 &= ~0x03;
	P0 = 0x00;
	KBPATN = 0x03  	
        KBCON = 0x00;	// pattern must not match
	//KBCON &= 0xFE;
	KBMASK = 0x00;	   	
	KBCON &= ~0x03;
	
  	IP1 &= 0xFD;			// set isr priority to 0
  	IP1H &= 0xFD;
	
  	EKBI = 1;			// enable keypad interrupt
}