我刚拿到一套19193EVB的板子，想试试看板子有没有问题，想写程序通过按下SW2点亮LED2，可是总是没有任何反应，由于刚刚接触硬件，不知道下面的代码哪里有问题，请大家指教！

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC9S08GT60.h> /* include peripheral declarations */

/*define value for led's when on and off*/
#define ON 0
#define OFF 1

/*define value for switches when up (not pressed) and down (pressed)*/
#define UP 1
#define DOWN 0

/*define led's*/
#define LED1 PTDD_PTDD0
#define LED2 PTDD_PTDD1

#define LED3 PTDD_PTDD3
#define LED4 PTDD_PTDD4

/*define switches*/
#define SW1 PTAD_PTAD2
#define SW2 PTAD_PTAD3
#define SW3 PTAD_PTAD4
#define SW4 PTAD_PTAD5

void main(void) {
  EnableInterrupts; /* enable interrupts */
  /* include your code here */
 
  PTADD = 0; //initialize as input (Data Direction Register)
  PTAPE = 0x3c; //Pullups on upper 2,3,4,5 bits
  /*initialize bits 0,1,3,4 of Port D as outputs (connected to led's)*/
  PTDDD = 0x1b;
  LED1 = OFF;
  LED2 = OFF;
  LED3 = OFF;
  LED4 = OFF;

  for(;;) {
    __RESET_WATCHDOG(); /* feeds the dog */
    LED2 = SW2;
  } /* loop forever */
  
}