#includereg51.h

#includeintrins.h

#define uchar unsigned char

#define uint unsigned int

//段码

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

//待显示的 3 位缓冲

uchar Num_Buffer={0,0,0};

//按键代码，按键计数

uchar Key_Code,Key_Counts=0;

//延时

void DelayMS(uint x)

{

uchar i;

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

}

//显示函数

void Show_Counts_ON_DSY()

{

uchar i,j=0x01;

Num_Buffer=Key_Counts/100;

Num_Buffer=Key_Counts/10%10;

Num_Buffer=Key_Counts%10;

for(i=0;i3;i++)

{

j=_cror_(j,1);

P0=0xff;

P0=DSY_CODE];

P2=j;

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;

//有键按下时，数码管刷新显示 30 次，该行代码同时起到延时作用

if(Key_Code!=0xff)

for(i=0;i30;i++) Show_Counts_ON_DSY();

switch(Key_Code)

{

case 0xfe: if(Key_Counts255)

Key_Counts++;

break;

case 0xfd: if(Key_Counts0)

Key_Counts--;

break;

case 0xfb: Key_Counts=0;

}

Key_Code=0xff;

}

}