283 基于单片机八路抢答系统仿真设计

完整版 电路图和程序代码 下载地址

https://pan.baidu.com/s/1UEx-nh1Dg-pAJSUGoDCkaQ?pwd=8888

部分代码展示

#include <at89x51.h>
#define uchar	unsigned char
#define uint	unsigned int
#define  M	10
char	s;
uchar	num		= 0;
char	time		= 30;                   /* 抢答时间 */
char	datitime	= 30;                   /* 答题限时时间 */
uint	tt, t1;                                 /* T0,T1定时器定一秒时 */
bit	flag, s_flag = 1, b_flag, fall_flag;    /* 标志位 */
bit	K_startcountflag, K_timecountflag;      /* 时间调整标志位 */
sbit	K0		= P3 ^ 0;
sbit	beep		= P3 ^ 7;               /* 蜂鸣器 */
sbit	rled		= P3 ^ 1;               /* 指示灯 */
sbit	K1		= P1 ^ 0;
sbit	K2		= P1 ^ 1;
sbit	K3		= P1 ^ 2;
sbit	K4		= P1 ^ 3;
sbit	K5		= P1 ^ 4;
sbit	K6		= P1 ^ 5;
sbit	K7		= P1 ^ 6;
sbit	K8		= P1 ^ 7;
sbit	scl		= P0 ^ 0;
sbit	sda		= P0 ^ 1;
sbit	K_Time		= P3 ^ 2;       /*复位键 */
sbit	K_startcount	= P3 ^ 3;       /* 开始抢答时间调整键 */
sbit	add		= P3 ^ 4;       /* 答题计时时间调整键 */
sbit	sub		= P3 ^ 5;       /* 答题计时时间调整键 */
void delay( uchar ms )
{
	uchar y;
	for (; ms > 0; ms-- )
		for ( y = 120; y > 0; y-- )
			;
}
 
 
uchar code	tabledu[] = { 0x3f, 0x06, 0x5b, 0x4f,
			      0x66,	 0x6d, 0x7d, 0x07,
			      0x7f,	 0x6f, 0x77, 0x7c,
			      0x39,	 0x5e, 0x79, 0x71 };
uchar code	tablewe[] = { 0XFE, 0XFD, 0XFB, 0XF7 };
void T0_Init( void )
{
	TMOD	= 0X01;
	TH0	= (65536 - 2000) / 256;
	TL0	= (65536 - 2000) % 256;
	TH1	= (65536 - 2000) / 256;
	TL1	= (65536 - 2000) % 256;
	ET0	= 1;
	ET1	= 1;
	EA	= 1;
	P0	= 0;
}
 
 
void Key_Scan( void )  /* 开始键扫描 */
{
	if ( K0 == 0 )
	{
		delay( 10 );
		if ( K0 == 0 )
		{
			while ( !K0 )
				;
			TR0			= 1;
			s			= time;
			tt			= 0;
			flag			= 1;
			s_flag			= 1;
			b_flag			= 1;
			num			= 0;
			beep			= 1;
			rled			= 1;
			fall_flag		= 0; /* 清除违规标志位 */
			K_startcountflag	= 0;
			K_timecountflag		= 0;
		}
	}
	if ( K_Time == 0 )
	{
		delay( 10 );
		if ( K_Time == 0 )
		{
			TR0			= 0;
			TR1			= 1;
			s			= time;
			flag			= 0;
			s_flag			= 1;
			num			= 0;
			rled			= 1;
			fall_flag		= 0; /* 清除违规标志位 */
			K_startcountflag	= 0;
			K_timecountflag		= 0;
		}
	}
}
 
 
void  WRITE_A_BYTE( uchar input )
{
	uchar t;
	for ( t = 8; t != 0; t-- )
	{
		sda = (bit) (input & 0x80);
		delay( M );
		scl = 1;
		delay( M );
		input	= input << 1;
		scl	= 0;
		delay( M );
	}
}
 
 
void Scan( void )  /* 八路热键扫描(哪个键先按下,哪个优先级最高) */
{
	if ( K1 == 0 )
	{
		delay( 10 );
		if ( K1 == 0 )
		{
			while ( !K1 )
				;
			num	= 1;    /* 数码管显示1号"1" */
			TR0	= 0;    /* 关闭定时器0,时间停止 */
			TR1	= 1;    /* 打开定时器1,使扬声器响一声 */
			s_flag	= 0;    /* 关闭开始键标志位,使再按其他七个键不会响应 */
		}
	}
	if ( K2 == 0 )                  /*下面七个键的处理同上 */
	{
		delay( 10 );
		if ( K2 == 0 )
		{
			while ( !K2 )
				;
			num	= 2;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0; /* 重要 */
		}
	}
	if ( K3 == 0 )
	{
		delay( 10 );
		if ( K3 == 0 )
		{
			while ( !K3 )
				;
			num	= 3;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
	if ( K4 == 0 )
	{
		delay( 10 );
		if ( K4 == 0 )
		{
			while ( !K4 )
				;
			num	= 4;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
	if ( K5 == 0 )
	{
		delay( 10 );
		if ( K5 == 0 )
		{
			while ( !K5 )
				;
			num	= 5;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
	if ( K6 == 0 )
	{
		delay( 10 );
		if ( K6 == 0 )
		{
			while ( !K6 )
				;
			num	= 6;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
	if ( K7 == 0 )
	{
		delay( 10 );
		if ( K7 == 0 )
		{
			while ( !K7 )
				;
			num	= 7;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
	if ( K8 == 0 )
	{
		delay( 10 );
		if ( K8 == 0 )
		{
			while ( !K8 )
				;
			num	= 8;
			TR0	= 0;
			TR1	= 1;
			s_flag	= 0;
		}
	}
}
 
 
void display( void )
{
	if ( flag == 1 )                        /* 开始键按下,开始计时抢答 */
	{
		if ( num != 0 )                 /* 如果有人抢答,则显示相应的几号 */
		{
			P0	= tabledu[num]; /* 显示几号抢到了 */
			P2	= tablewe[0];
			delay( 2 );
			P0	= 0;
			P2	= 0XFF;
		}else  { /* 否则没人抢答,则前面不显示几号 */
			P0	= 0;
			P2	= 0XFF;
		}
		P0	= tabledu[s / 10]; /*下面为显示抢答倒计时 */
		P2	= tablewe[2];
		delay( 2 );
		P0	= 0;
		P2	= 0XFF;
		P0	= tabledu[s % 10];
		P2	= tablewe[3];
		delay( 2 );
		P2	= 0XFF;
		P0	= 0;
	}else  { /* 如果开始键没有按下,则显示F FF(若有违规者,则显示违规号码及 FF)或时间调整 */
		if ( fall_flag == 1 )                   /* 违规显示 */
		{
			if ( num != 0 )
			{
				P0	= tabledu[num]; /* 显示几号违规了 */
				P2	= tablewe[0];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
 
				P0	= tabledu[15];  /*下面显示 FF,表示违规了 */
				P2	= tablewe[2];
				delay( 2 );
				P0	= 0;            /* 消隐 */
				P2	= 0XFF;
				P0	= tabledu[15];
				P2	= tablewe[3];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
			}else  {
				P0	= 0;
				P2	= 0XFF;
			}
		}else  { /* 没有人违规才显示调整时间 */
			if ( K_startcountflag == 1 )
			{
				P0	= 0X6D;                 /* 第一位数码管显示"5(S)"(表示抢答时间调整) */
				P2	= tablewe[0];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
				P0	= tabledu[time / 10];   /*下面显示调整的抢答时间 */
				P2	= tablewe[2];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
				P0	= tabledu[time % 10];
				P2	= tablewe[3];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
			}else  { /* 否则显示0 00 */
				P0	= tabledu[0];
				P2	= tablewe[0];
				delay( 2 );
				P0	= 0;
				P0	= tabledu[0];
				P2	= tablewe[2];
				delay( 2 );
				P0	= 0; /* 消隐 */
				P2	= 0XFF;
				P0	= tabledu[0];
				P2	= tablewe[3];
				delay( 2 );
				P0	= 0;
				P2	= 0XFF;
			}
		}
	}
}