单片机数字钟设计 (3)

 

7． C语言源程序
#include <AT89X51.H>
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,
                               0x66,0x6d,0x7d,0x07,
                               0x7f,0x6f,0x77,0x7c,
                               0x39,0x5e,0x79,0x71,0x00};
unsigned char dispbitcode[]={0xfe,0xfd,0xfb,0xf7,
                             0xef,0xdf,0xbf,0x7f};
unsigned char dispbuf[8]={0,0,16,0,0,16,0,0};
unsigned char dispbitcnt;
unsigned char second;
unsigned char minite;
unsigned char hour;
unsigned int tcnt;
unsigned char mstcnt;
unsigned char i,j;
void main(void)
{
  TMOD=0x02;
  TH0=0x06;
  TL0=0x06;
  TR0=1;
  ET0=1;
  EA=1;
  while(1)
    {
      if(P0_0==0)
        {
          for(i=5;i>0;i--)
          for(j=248;j>0;j--);
          if(P0_0==0)
            {
              second++;
              if(second==60)
                {
                  second=0;
                }
              dispbuf[0]=second;
              dispbuf[1]=second/10;
              while(P0_0==0);
            }
        }
      if(P0_1==0)
        {
          for(i=5;i>0;i--)
          for(j=248;j>0;j--);
          if(P0_1==0)
            {
              minite++;
              if(minite==60)
                {
                  minite=0;
                }
              dispbuf[3]=minite;
              dispbuf[4]=minite/10;
              while(P0_1==0);
            }
        }
      if(P0_2==0)
        {
          for(i=5;i>0;i--)
          for(j=248;j>0;j--);
          if(P0_2==0)
            {
              hour++;
              if(hour==24)
                {
                  hour=0;
                }
              dispbuf[6]=hour;
              dispbuf[7]=hour/10;
              while(P0_2==0);
            }
        }
    }
}
void t0(void) interrupt 1 using 0
{
  mstcnt++;
  if(mstcnt==8)
    {
      mstcnt=0;
      P1=dispcode[dispbuf[dispbitcnt]];
      P3=dispbitcode[dispbitcnt];
      dispbitcnt++;
      if(dispbitcnt==8)
        {
          dispbitcnt=0;
        }
    }
  tcnt++;
  if(tcnt==4000)
    {
      tcnt=0;
      second++;
      if(second==60)
        {
          second=0;
          minite++;
          if(minite==60)
            {
              minite=0;
              hour++;
              if(hour==24)
                {
                  hour=0;
                }
            }
        }
      dispbuf[0]=second;
      dispbuf[1]=second/10;
      dispbuf[3]=minite;
      dispbuf[4]=minite/10;
      dispbuf[6]=hour;
      dispbuf[7]=hour/10;
    }
}