//項(xiàng)目名稱：按鍵控制數(shù)碼管加減演示

//項(xiàng)目再創(chuàng)作者：科技小宅神

//完成時(shí)間：2021/01/21

#include <reg51.h>//c51頭文件

#include <intrins.h>//c51內(nèi)部移位函數(shù)

#define uchar unsigned char

#define uint? unsigned int

//段碼

uchar code DSY_CODE[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};

//待顯示的3位緩沖

uchar Num_Buffer[]={0,0,0};

//按鍵代碼，按鍵計(jì)數(shù)

uchar Key_Code,Key_Counts=0;

//1毫秒延時(shí)子程序

void DelayMS(uint x)

{

? uchar t;

while(x--)

{

for(t=0;t<120;t++);

}

}

//刷新顯示函數(shù)

void Show_Counts_ON_DSY()

{

? uchar i,j=0x01;

Num_Buffer[2]=Key_Counts/100; //百位

? ? Num_Buffer[1]=Key_Counts/10%10; //十位

Num_Buffer[0]=Key_Counts%10; //個(gè)位

for(i=0;i<3;i++)

{

j = _cror_(j,1);//循環(huán)右移，每次移一位

P2 = j;//P2循環(huán)右移，每次移一位

P0 = DSY_CODE[Num_Buffer[i]];

DelayMS(1);

}

}

//主程序

void main()

{

? uchar i;

P0 = 0xff;

P1 = 0xff;

P2 = 0x00;

Key_Code=0xff;

while(1)

{

Show_Counts_ON_DSY();

P1 = 0xff;

Key_Code=P1;

if(Key_Code != 0xff)

{

for(i=0;i<30;i++)

{

Show_Counts_ON_DSY();

}

}

switch(Key_Code)//按鍵代碼多分支選擇結(jié)構(gòu)

{

case 0xfe: //當(dāng)P1=0xfe,即P1.0=0，即k1按下時(shí)

? ? ? ?if(Key_Counts<255) Key_Counts++;break;//如果按鍵計(jì)數(shù)小于

case 0xfd: //當(dāng)P1=0xfd,即P1.1=0,即k2按下時(shí)

? ? ? ?if(Key_Counts>0) Key_Counts--;break;

case 0xfb: //當(dāng)P1=0xfb,即P1.2=0,即k3按下時(shí)

? ? ? ?Key_Counts=0;

}

Key_Code = 0xff;

}

}