#include<iocc2530.h>
#define uchar unsigned char
#define uint unsigned int
#define LED1 P1_5
#define LED2 P1_0
#define LED3 P1_3
#define LED4 P1_4

uint count=0;
void Initial(void)
{
  P1SEL&=~0x39;
  P1DIR|=0x39;
  P1SEL&=~0x04;
  P1DIR&=~0x04;
  P1INP&=~0x04; 
  P1INP&=~0x40;
  P1&=~0x39;  
}

uchar KeyScan(void)
{
  if(P1_2==0)
  {
    if(P1_2==0)
    {
      while(!P1_2)
        return 1;   
    }
  }
  return 0;
}

void Delay(uint time)
{
  uint i;
  uchar j;
  for(i=0;i<time;i++)
    for(j=0;j<240;j++)
    {
      asm("NOP");
      asm("NOP");
      asm("NOP");
    }
}

main()
{
  Initial();
  while(1)
  {
    if(KeyScan()==1)
    {
      count++;
      if(count<=4)
      {
      switch(count)
      {
      case 1:LED1=!LED1;break;
      case 2:LED2=!LED2;break;
      case 3:LED3=!LED3;break;
      case 4:LED4=!LED4;break;
      }
      }
      if(count>4)
      {
        LED1=LED2=LED3=LED4=0;
        count=0;
      }
    }
  }
}