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--)

}

下面是用C51编写的简单程序：

#include <reg51.h>

#include <intrins.h>

sbit io_Key = P1 ^ 1

sbit led1 = P1 ^ 2

sbit led2 = P1 ^ 3

sbit led3 = P1 ^ 4

unsigned char ucCount = 0

bit flag05s = 0

//---------------------------------

void delay125us(void) //@12.000MHz

{

unsigned char i

i = 60

while (--i)

}

void Timer0Init(void) //10毫秒@12MHz

{

TMOD &= 0xF0 //设置定时器模式

TMOD |= 0x01 //设置定时器模式

TL0 = 0xF0 //设置定时初值

TH0 = 0xD8 //设置定时初值

TR0 = 1 //开定时器0

ET0 = 1//开定时器0中断

EA = 1 //开总中断

}

//T0中断用来计数器溢出

void zd0(void) interrupt 1

{

TL0 = 0xF0 //设置定时初值

TH0 = 0xD8 //设置定时初值

if(++ucCount >= 50)

{

ucCount = 0

flag05s = 1//g_flag05s = isYes定时0.52秒到，用于测量周期延时

}

}

void main(void)

{

unsigned char CountTemp = 0, ucState = 0

Timer0Init()

while(1)

{

//-------------------------------

//简单的按键检测程序：

io_Key = 1

_nop_()

if( io_Key == 0 )

{

CountTemp = 0

do

{

delay125us()

if( io_Key != 0 ) break

} while(++CountTemp >160)// 延时20ms去抖动

if(CountTemp >160)//如果按键时间有效，改变状态

{

switch(ucState)

{

case(0):

{

ucState = 1

led1 = 0

led2 = 0

led3 = 0

}

break

case(1):

{

ucState = 2

led1 = 0

led2 = 0

led3 = 0

}

break

case(2):

{

ucState = 0

led1 = 0

led2 = 1

led3 = 1

}

break

}

while(io_Key == 0) //等待按键释放

}

}

//------------------------------

//每0.5秒改变一下LED状态

if(flag05s == 1)

{

flag05s = 0

switch(ucState)

{

case(0):

{

led1 = !led1

led2 = !led2

led3 = !led3

}

break

case(1):

{

bit ledTemp = led1

led1 = led2

led2 = led3

led3 = ledTemp

}

break

//LED常亮可以忽略改变LED状态

/*

case(2):

{

led1 = 0

led2 = 0

led3 = 0

}

break

*/

}

}

}

}

//-----------------------------------------------

//上面程序中有很多地方可以优化，这里只是给出一个参考供学习。

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