時(shí)間：2013-05-22 15:40:01

/* 名稱：K1-K4 按鍵狀態(tài)顯示

說(shuō)明：K1、K2 按下時(shí) LED 點(diǎn)亮，松開(kāi)時(shí)熄滅，

*/

K3、K4 按下并釋放時(shí) LED 點(diǎn)亮，再次按下并釋放時(shí)熄滅；

#includereg51.h>

#define uchar unsigned char

#define uint unsigned int

sbit LED1=P0^0;

sbit LED2=P0^1;

sbit LED3=P0^2;

sbit LED4=P0^3;

sbit K1=P1^0;

sbit K2=P1^1;

sbit K3=P1^2;

sbit K4=P1^3;

//延時(shí)

void DelayMS(uint x)

{

uchar i;

while(x--) for(i=0;i120;i++);

}

//主程序

void main()

{

P0=0xff;

P1=0xff;

while(1)

{

LED1=K1;

LED2=K2;

if(K3==0)

{

while(K3==0);

LED3=~LED3;

}

if(K4==0)

{

while(K4==0);

LED4=~LED4;

}

DelayMS(10);

}

}