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/****************************************************
* 實驗內容
* 四路搶答器
**************************************************/
#include <reg52.h>
typedef unsigned int u16;
typedef unsigned char u8;
/***********************************************
*
* 變量及引腳定義聲明
*************************************************/
sbit AA = P2^2;
sbit BB = P2^3;
sbit CC = P2^4;
sbit k3 = P3^2;
sbit k4 = P3^3;
sbit beep = P1^5;
int i=0; //初始狀態控制毫秒的兩位數碼管為0
int j=10; //初始狀態控制秒的兩位數碼管為10
int jishu=0; //以10ms為一個劑量，精準控制毫秒的99-0
int cishu=0; //消除最后一秒帶來的影響
int xuanshou=0; //選手編號
int biaozhi=1; //控制搶答開始后只有一個人可以被記錄
int wei1=0 , wei2=0 , wei3=0;
enum position {zero, one, two, three, four, five, six, seven};
u16 code duanxuan[16] = { 0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
/*****************************************************
*
* 子函數申明
******************************************************/
void delay(u16 i); //延時函數
void jvzhen(); //矩陣鍵盤選手確定
void weixuan( u16 i ); //數碼管位選
void timer0(); //定時器初始化
void xianshi(); //數碼管倒計時顯示
void int0(); //中斷0倒計時開始
void int1(); //中斷1問題結束恢復數碼管
void panduan(); //答題選手的判斷
void qiangda(); //選手搶答時的判斷
/*****************************************************
* 主函數
*******************************************************/
void main()
{
int0();
int1();
timer0();
while(1)
{
xianshi();
jvzhen();
panduan();
qiangda();
}
}
void qiangda()
{
if( j==10&&xuanshou!=0 )
{
wei1 = xuanshou;
while(1)
{
xianshi();
weixuan(7);
P0 = duanxuan[wei1];
delay(1);
P0 = 0x00;
beep=~beep;
delay(1);
jvzhen();
if( xuanshou!=wei1 )
{
break;
}
if( k4==0 )
{
break;
}
}
wei2 = xuanshou;
while(1)
{
xianshi();
weixuan(7);
P0 = duanxuan[wei2];
delay(1);
P0 = 0x00;
weixuan(6);
P0 = duanxuan[wei1];
delay(1);
P0 = 0x00;
beep=~beep;
delay(1);
jvzhen();
if( xuanshou!=wei2 )
{
break;
}
if( k4==0 )
{
break;
}
}
wei3 = xuanshou;
while(1)
{
xianshi();
weixuan(7);
P0 = duanxuan[wei3];
delay(1);
P0 = 0x00;
weixuan(6);
P0 = duanxuan[wei2];
delay(1);
P0 = 0x00;
weixuan(5);
P0 = duanxuan[wei1];
delay(1);
P0 = 0x00;
beep=~beep;
delay(1);
jvzhen();
if( k4==0 )
{
break;
}
}
}
}
/* 延時 */
void delay(u16 i)
{
u16 a;
while(i--)
{
for(a = 0; a < 100; a++)
{
;
}
}
}
/* 顯示哪位選手按鍵暫停 */
void panduan()
{
if( i!=0 && xuanshou!=0 )
{
switch( xuanshou )
{
case 1 : TR0=0; weixuan(7); P0=duanxuan[1]; delay(1); P0 = 0x00; break;
case 2 : TR0=0; weixuan(7); P0=duanxuan[2]; delay(1); P0 = 0x00; break;
case 3 : TR0=0; weixuan(7); P0=duanxuan[3]; delay(1); P0 = 0x00; break;
case 4 : TR0=0; weixuan(7); P0=duanxuan[4]; delay(1); P0 = 0x00; break;
}
biaozhi=0;
}
}
/* 矩陣鍵盤選手確定 */
void jvzhen()
{
P1 = 0x0f;
if( (P1!=0x0f&&biaozhi==1) )
{
delay(5);
if( (P1!=0x0f) )
{
switch( P1 )
{
case 0x07 : xuanshou = 1; break;
case 0x0b : xuanshou = 2; break;
case 0x0d : xuanshou = 3; break;
case 0x0e : xuanshou = 4; break;
}
P1=0xf0;
switch( P1 )
{
case (0x70) : xuanshou = xuanshou; break;
}
}
}
}
/* 數碼管位選*/
void weixuan( u16 i )
{
switch(i)
{
case (zero): CC = 0; BB = 0; AA = 0; break; //第零位
case (one): CC = 0; BB = 0; AA = 1; break; //第一位
case (two): CC = 0; BB = 1; AA = 0; break; //第二位
case (three): CC = 0; BB = 1; AA = 1; break; //第三位
case (four): CC = 1; BB = 0; AA = 0; break; //第四位
case (five): CC = 1; BB = 0; AA = 1; break; //第五位
case (six): CC = 1; BB = 1; AA = 0; break; //第六位
case (seven): CC = 1; BB = 1; AA = 1; break; //第七位
}
}
/* 定時器初始化*/
void timer0()
{
TMOD =0x01;
TH0 = (65536-1000)/256;
TL0 = (65536-1000)%256; //1ms
ET0 = 1;
EA = 1;
}
/* 倒計時顯示 */
void xianshi()
{
weixuan(0);
P0 = duanxuan[i%10];
delay(1);
P0 = 0x00;
weixuan(1);
P0 = duanxuan[i/10];
delay(1);
P0 = 0x00;
weixuan(2);
P0 = 0x40;
delay(1);
P0 = 0x00;
weixuan(3);
P0 = duanxuan[j%10];
delay(1);
P0 = 0x00;
weixuan(4);
P0 = duanxuan[j/10];
delay(1);
P0 = 0x00;
}
/* 倒計時開始 */
void int0()
{
EA=1;
IT0=1;
EX0=1;
}
/* 數碼管復位 */
void int1()
{
EX1=1;
IT1=1;
EA=1;
}

復制代碼

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