MSP430 Keyboard Program

// This sample program does not display,
// Pressing a key on the keyboard triggers the interrupt service routine of port P1, gets the key value of the keyboard, and saves it to the key value queue.
// In other interrupt service routines, the data in the key value queue guides the program flow.
#include   
unsigned char keybuff[10];
unsigned char keypoint=0; 
void delay(int v)
    {
        while(v!=0)v--;
    }
 
unsigned char key(void)
  {
    unsigned char x=0xff;
    P1DIR=0X0F;
    P1OUT=0X01; //Scan the first line
    if((P1IN&0X70)==0X10)       
       x=0;
       else
          if((P1IN&0X70)==0X20)
            x=1;
                else
                  if((P1IN&0X70)==0x40)
                    x=2;
       else 
        {
          P1OUT=0X2; //Scan the second lineif
          ((P1IN&0X70)==0X10)
             x=3;
             else
               if((P1IN&0X70)==0X20)
                  x=4;
                    else
                      if((P1IN&0X70)==0x40)
                        x=5;
           else
           {
            P1OUT=0X4; //Scan the third lineif
            ((P1IN&0X70)==0X10)
            x=6;
              else
                if((P1IN&0X70)==0X20)
                x=7;
                  else
                  if((P1IN&0X70)==0x40)
                    x=8;
             else 
             { P1OUT=8; //Scan the fourth lineif
             ((P1IN&0X70)==0X10)
       x=9;
       else
          if((P1IN&0X70)==0X20)
            x=10;
                else
                  if((P1IN&0X70)==0x40)
                    x=11;
                    }
             }      
         }    
  return(x);
  }
  
  
unsigned char keyj(void) 
    {unsigned char x;
    P1DIR=0x0f;
    P1OUT=0x0f; //Keyboard hardware: P10--P13 are row lines, the top one is P10
    x=(P1IN&0X70); // P14--P16 are column lines, the leftmost one is P14, column lines are pulled down
    return(x); // No key pressed, return 0?; Key pressed returns non-0
    }  
     
       
interrupt[PORT1_VECTOR] void port1key(void)
        {
        if(keyj()!=0X00)
           {
           delay(300); //Debounce
               if(keyj()!=0X0)
                 {
                    keybuff[keypoint]=key(); //Key press, see key value, save to queue
                    keypoint++; //
                    if(keypoint==10)
                         keypoint=0;
                  }
            }
         P1OUT=0X0F;
         P1IFG=0X0; //Clear interrupt flag
        }

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD; /* // Stop WDT */
  P1DIR=0XF;
  P1OUT=0XF;
  P1IES=0X0;
  P1IE=0X70; //Column line rising edge enables P1 interrupt
   _EINT(); /*/ Enable interrupts */
  
  while(1)
  { 
  
     LPM0;                   
    _NOP();   
}