//非中断方式实现按键控制LED灯
/*
1：全部灯熄灭
2：按下按键SW1不超过一秒后松开LED灯亮
3：再次按下灯灭
*/

#include<iocc2530.h>
#define uint unsigned int
#define uchar unsigned char
#define LED P1_0

uchar KeyScan(void)
{
if(P1_2==0)//低电平有效
{
if(P1_2==0)//软件消抖
{
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)//如果按下了
  {
  LED=!LED;
  Delay(1200); 
  }
  }
}