EEPW论坛

今天继续调试板子，写了一个简单的数字钟视频。
C代码如下：
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit LS138A = P2^0;   //定义138译码器的输入A脚由P2.0控制
sbit LS138B = P2^1;     //定义138译码器的输入脚B由P2.1控制
sbit LS138C = P2^2;  //定义138译码器的输入脚C由P2.2控制

uchar code seven_seg[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};
uchar code   dispbit[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
void delay(uint i)
{ char j;
    for(i; i > 0; i--)
        for(j = 200; j > 0; j--);

}
typedef struct{
    char hour;
 char minute;
 char second;
 }time;
time now;
uint ledout[10];

void main()
{   uchar i,delaycnt=0;
    EA=1;
 EX0=1;
 EX1=1;
 IT0=1;
 IT1=1;
    now.second=0;
 now.minute=58;
 now.hour=23;
    while(1)
 {  if(++delaycnt==20)
    { delaycnt=0;
      now.second++;
   if(now.second==60)
   { now.second=0;
     now.minute++;
     if(now.minute==60)
     { now.minute=0;
       now.hour++;
    if(now.hour==24)
    { now.hour=0;
    }
    
     }
  
   }
    }
    ledout[7]=seven_seg[now.second%10];
    ledout[6]=seven_seg[now.second/10];
    ledout[5]=0x40;
    ledout[4]=seven_seg[now.minute%10];
    ledout[3]=seven_seg[now.minute/10];
    ledout[2]=0x40;
    ledout[1]=seven_seg[now.hour%10];
    ledout[0]=seven_seg[now.hour/10];
    for(i=0;i<8;i++)
    {  P0=ledout[i];
       switch(i)   //使用switch 语句控制位选       
      {    
   case 0:LS138A=0; LS138B=0; LS138C=0;  break;        
         case 1:LS138A=1; LS138B=0; LS138C=0;  break;              
         case 2:LS138A=0; LS138B=1; LS138C=0;  break;
         case 3:LS138A=1; LS138B=1; LS138C=0;  break;
   case 4:LS138A=0; LS138B=0; LS138C=1;  break;
   case 5:LS138A=1; LS138B=0; LS138C=1;  break;
   case 6:LS138A=0; LS138B=1; LS138C=1;  break;
   case 7:LS138A=1; LS138B=1; LS138C=1;  break;
   
      }
     delay(250);
   
    }
         
 
 }

}

void int0() interrupt 0
{  now.hour++;
   if(now.hour==24)
   now.hour=0;

}
void int1() interrupt 2
{  now.minute++;
   if(now.minute==60)
   now.minute=0;
}