基于单片机的数字时钟系统设计

#include

#define uchar unsigned char

#define uint  unsigned int

uchar sec = 6, min = 6, hou = 6, a = 0, b = 0, c = 0;

uchar num = 0, cmd = 0;

uint time = 0;

uint flag = 0;

sbit P30 = P3^0;

sbit P35 = P3^5;

sbit P32 = P3^2;

sbit P33 = P3^3;

uchar code tab[]={0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0xbf, 0xff, 0xc6};//数码管显示数字

void delay(uchar i);

void time_rec();

void display();

void displaym();

void keyscan();

void led_display();

void init();

void delay(uchar i)

{

uchar j;

while ((i--) != 0)

{

for(j = 0; j < 125; j--);

}

}

void time_rec()

{

if(sec == 60)

{

sec = 0;

min ++;

if(min == 60)

{

min = 0;

hou ++;

if(hou == 24)

{

hou = 0;

}

}

}

}

void display()

{

P1 = 0X01;//位选第一个数码管

P2 = 0x20;//打开段选

P0 = tab[hou / 10];//显示数字

  P2 &= 0x1f;//关闭段选

P2 = 0xff;

delay(4);

P1 = 0x02;

P2 = 0x20;

P0 = tab[hou % 10];

P2 &= 0x1f;

delay(4);

P1 = 0x04;

P2 = (P2&0x1f)|0x20;

P0 = 0xbf;

P2 &= 0x1f;

delay(4);

P1 = 0x08;

P2 = (P2&0x1f)|0x20;

P0 = tab[min / 10];

P2 &= 0x1f;

delay(4);

P1 = 0x10;

P2 = (P2&0x1f)|0x20;

P0 = tab[min % 10];

P2 &= 0x1f;

delay(4);

P1 = 0x20;

P2 = (P2&0x1f)|0x20;

P0 = 0xbf;

P2 &= 0x1f;

delay(4);

P1 = 0x40;

P2 = (P2&0x1f)|0x20;

P0 = tab[sec / 10];

P2 &= 0x1f;

delay(4);

P1 = 0x80;

P2 = (P2&0x1f)|0x20;

P0 = tab[sec % 10];

P2 &= 0x1f;

delay(4);

}

void keyscan()

{

if(P35 == 0)

{

delay(5);

if(P35 == 0)

{

cmd = cmd + 1;

}

while(P35 == 0) {display();}

}

if(P32 == 0)

{

delay(5);

if(P32 == 0)

{

EX0 = 1;

}

while(P32 == 0) {display();}

}

if(P33 == 0)

{

delay(5);

if(P33 == 0)

{

EX1 = 1;

}

while(P33 == 0) {display();}

}

}

void init()

{

ET0 = 1;

TMOD = 0x11;     //time0为定时器，方式1

TH0 = (65535 - 50000) / 256;      //预置计算初值

TL0 = (65535 - 50000) % 256;

ET1 = 1;

TH1 = 0xff;

  TL1 = 0xff;

IT0 = 1;         //低电平有效

IT1 = 1;

TR0 = 1;         //为1时启动计数

TR1 = 1;

EA = 1;

}

int main()

{     

P3 = 0xff;       //初始化P3口，全设为1

init();

while(1)

{

display();

time_rec();

keyscan();

}

return 0;

}

void timer_0() interrupt 1

{

TH0 = (65535 - 50000) / 256;

TL0 = (65535 - 50000) % 256;

time++;

if(time == 20)

{

if(flag == 0)

{

sec++;

time = 0;

}

else

{

time = 0;

}

}

}

void T1_int() interrupt 3 using 2        //中断T1 用于 可在时间校准的减

{

if(cmd != 0)

{

cmd = 0;

TH1=0xff;

TL1=0xff;

switch(num)

{

case 1:hou = hou - 1;if(hou <= 0) hou = 23;break;

case 2:min = min - 1;if(min <= 0) min = 59;break;

case 3:sec = sec - 1;if(sec <= 0) sec = 59;break;

default:break;

}

}

}

void I0_int() interrupt 0         //外部中断0 用于校准时间在时、分、秒之间进行切换

{

num = num + 1;

if(num == 3)

{

flag = 1;

}

if(num == 4)

{

flag = 0;

num = 0;                                        //退出调时功能

}

}

void I1_int() interrupt 2                       //外部中断1 用于调时的加 

{

EX1 =0;

  switch(num)

  {

case 1:hou = hou + 1;if(hou >= 24) hou = 0;break;

       Case 2:min = min + 1;if(min >= 60) min = 0;break;

case 3:sec = sec + 1;if(sec >= 60) sec = 0;break;

    default:break;

  }

}