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#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//變量定義
sbit BEEP=P3^1;
sbit start_stop=P3^2;
sbit reset=P3^3;
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^3;
sbit key5=P1^4;
sbit key6=P1^5;
sbit key7=P1^6;
sbit key8=P1^7;
sbit state=P3^0;
bit start_stop_flag=0;
bit key1_flag=0;
bit key2_flag=0;
bit key3_flag=0;
bit key4_flag=0;
bit key5_flag=0;
bit key6_flag=0;
bit key7_flag=0;
bit key8_flag=0;
bit reset_flag=0;
bit action=0;
uchar second=20;
uchar timer0_count=0;
uchar number=0;
uchar number_display=0;
uint flag=1; //延時函數(shù)
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=120;y>0;y--);
} //蜂鳴器發(fā)聲延時
void DelayMS(uint x)
{
uchar t;
while(x--)
for(t=0;t<100;t++);
} //數(shù)碼管顯示驅(qū)動函數(shù)
void display(uchar number,uchar second)
{
uchar second_first,second_second;
second_first = second / 10;
second_second = second % 10;
P0 =0x00;
P2 = 0xfe;
P0 = table[number];
delay(2);
P0 =0x00;
P2 = 0xfd;
P0 = 0x40;
delay(2);
P0 =0x00;
P2 = 0xfb;
P0 = table[second_first];
delay(2);
P0 =0x00;
P2 = 0xf7;
P0 = table[second_second];
delay(2);
P0 =0x00; } //蜂鳴器響應(yīng)按周期t發(fā)音
void Play(uchar t)
{ uchar i; for(i=0;i<1;i++)
{ BEEP=~BEEP;
DelayMS(t); } BEEP=0;
} //開始鍵掃描函數(shù)
void start_stop_keyscan()
{
if(start_stop == 0)
{
delay(8);
if((start_stop == 0)&&(!start_stop_flag))
{
start_stop_flag = 1;
action = 1;
TR0 = 1;
state = 0;
}
}
else
{
start_stop_flag = 0;
}
} //八位搶答鍵掃描函數(shù)
uchar key_scan8()
{
if(key1 == 0)
{
delay(8);
if((key1 == 0)&&(!key1_flag))
{
key1_flag = 1;
number = 1;
number_display = number;
}
}
else
{
key1_flag = 0;
number = 0;
} if(key2 == 0)
{
delay(8);
if((key2 == 0)&&(!key2_flag))
{
key2_flag = 1;
number = 2;
number_display = number;
}
}
else
{
key2_flag = 0;
number = 0;
}
if(key3 == 0)
{
delay(8);
if((key3 == 0)&&(!key3_flag))
{
key3_flag = 1;
number = 3;
number_display = number;
}
}
else
{
key3_flag = 0;
number = 0;
}
if(key4 == 0)
{
delay(8);
if((key4 == 0)&&(!key4_flag))
{
key4_flag = 1;
number = 4;
number_display = number;
}
}
else
{
key4_flag = 0;
number = 0;
}
if(key5 == 0)
{
delay(8);
if((key5 == 0)&&(!key5_flag))
{
key5_flag = 1;
number = 5;
number_display = number;
}
}
else
{
key5_flag = 0;
number = 0;
}
if(key6 == 0)
{
delay(8);
if((key6 == 0)&&(!key6_flag))
{
key6_flag = 1;
number = 6;
number_display = number;
}
}
else
{
key6_flag = 0;
number = 0;
}
if(key7 == 0)
{
delay(8);
if((key7 == 0)&&(!key7_flag))
{
key7_flag = 1;
number = 7;
number_display = number;
}
}
else
{
key7_flag = 0;
number = 0;
}
if(key8 == 0)
{
delay(8);
if((key8 == 0)&&(!key8_flag))
{
key8_flag = 1;
number = 8;
number_display = number;
}
} else
{
key8_flag = 0;
number = 0;
} if(number_display != 0)
{
return 1;
}
else
{
return 0;
}
} //復(fù)位鍵掃描函數(shù)
void reset_keyscan()
{
if(reset == 0)
{
delay(8);
if((reset==0)&&(!reset_flag))
{
reset_flag = 1;
number_display = 0;
state = 1;
}
}
else
{
reset_flag = 0;
}
} //主函數(shù)
void main()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA= 1;
ET0= 1;
TR0=0;
while( 1)
{
if(number_display!=0)
Play(number_display/2); //蜂鳴器發(fā)聲
start_stop_keyscan();
reset_keyscan();
while(action)
{
while(!key_scan8())
{
display(number_display,second);
if(second == 0)
……………………
…………限于本文篇幅余下代碼請從51黑下載附件…………

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