单片机C语言按键开关程序

#include<reg52.h>

#define uint unsigned int

#define uchar unsigned char

void delay_ms(uint)

sbit led0=P0^0

sbit led1=P0^1

sbit key1=P3^2

sbit key2=P3^3

void main()

{

   uchar i=0

   uchar j=0

    while(1)

    {

       if(key1==0)//按键1

       {

        delay_ms(10)

        if(key1==0)

        {

            i++

            i=i%2

            switch(i)

            {

                 case 0: led0=1 break//关小灯

                 case 1: led0=0 break//开小灯

                 default:  break

            }

        }

        while(!key1)

        }

        

        if(key2==0)//按键2

       {

        delay_ms(10)

        if(key2==0)

        {

            j++

            j=j%2

            switch(j)

            {

                 case 0: led1=1 break//关小灯

                 case 1: led1=0 break//开小灯

                 default:  break

            }

        }

        while(!key2)

        }

    }

}

void delay_ms(uint z)  //延时子程序

{  

uint x,y

for(x=zx>0x--)

for(y=110y>0y--)

}

#include<reg51.h>

#define uchar unsigned char

uchar sec,min,num

sbit led1=P1^0

sbit led2=P1^1

sbit key=P3^2

bit flag

void delay(uchar x)

{

uchar i,j

for(i=0i<xi++)

for(j=0j<120j++)

}

void t0isr() interrupt 1

{

TH0=(65536-50000)/256

TL0=(65536-50000)%256

num++

if(num>=20)

{

num=0

sec++

if(sec>59)

{

sec=0

min++

switch(min)

{

case 0:led1=0break

case 1:if(flag){led1=0min=0flag=0}

break

case 4:led1=1led2=0break

case 8:led2=1break

default:break

}

if(min>=20)min=0

}

}

}

void ext0() interrupt 0

{

delay(30)

if(key==0)

{

while(!key)

flag=1

sec=0

min=0

num=0

led1=1

led2=1

}

}

main()

{

TMOD=0x01

TH0=(65536-50000)/256

TL0=(65536-50000)%256

ET0=1

EA=1

EX0=1

IT0=1

TR0=1

led1=0

led2=1

flag=0

while(1)

}

---