[嵌入式]51单片机 外部中断0切换点亮不同LED

使用外部中断0 即P3.2口一个按键切换点亮不同LED

#include <reg52.h>

unsigned int Mode=0;

sbit key1=P3^2;

void delay(unsigned int i)
{
	while(i--);
}

void Int0init()
{
	IT0=1;
	EX0=1;
	EA=1;
}


void main()
{
	while(1)
	{
		Int0init();
		switch(Mode)
		{
			case(0):if(Mode==0){P2=0xfe;}break;
			case(1):if(Mode==1){P2=0xfd;}break;
		  case(2):if(Mode==2){P2=0xfb;}break;
			case(3):if(Mode==3){P2=0xf7;}break;
			case(4):if(Mode==4){P2=0xef;}break;
		  case(5):if(Mode==5){P2=0xdf;}break;
			case(6):if(Mode==6){P2=0xbf;}break;
			case(7):if(Mode==7){P2=0x7f;}break;
		}
  }
}

void Int0() interrupt 0
{
	if(key1==0)
	{
	  delay(1000);
		if(key1==0)
		{
			Mode++;
			if(Mode>=8)
			{
				Mode=0;
			}
			while(!key1);
		}
	}
}