下面是個電子鐘的C語言程序，但如要在P1．5端口加一個發光二極管做秒位的閃動，要怎么改程序。

#include <at89x52.h>
#include <DS1302.h>
unsigned char code dispcode[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf};
unsigned char time[]={0,0,0,0,0,0,0,0};
unsigned char date[]={0,0,0,0,0,0,0,0};
SYSTEMTIME  time1;   
                             
void delay(unsigned char i)      
{
  unsigned char j;
  while((i--)!=0)
  {
    for(j=123;j>0;j--);
  }
}
unsigned char button_time(n,x,y)        
unsigned char n,x,y;
{
    if(P1_7==0)
    {
        delay(50);
        if(P1_7==0)
            {
                n++;
            if(n==x)
                n=0;
            while(P1_7==0);
            }
    }
}

unsigned char button_date(n,x,y)        
unsigned char n,x,y;
{
    if(P1_7==0)
    {
        delay(50);
        if(P1_7==0)
            {
                n++;
            if(n==x)
                n=1;
            while(P1_7==0);
            }
    }

void display(second10,second1,minute10,minute1,hour10,hour1)        
unsigned char second10,second1,minute10,minute1,hour10,hour1;  
{
  P2=0xfe;
  P0=dispcode[second10];
  delay(1);

  P2=0xfd;
  P0=dispcode[second1];        
  delay(1);

  P2=0xfb;
  P0=dispcode[10];                
  delay(1);

  P2=0xf7;
  P0=dispcode[minute10];
  delay(1);

  P2=0xef;
  P0=dispcode[minute1];        
  delay(1);

  P2=0xdf;
  P0=dispcode[10];                
  delay(1);

  P2=0xbf;
  P0=dispcode[hour10];        
  delay(1);

  P2=0x7f;
  P0=dispcode[hour1];        
  delay(1);
}        

void main()
{  
   unsigned char flag;
   Initial_DS1302();                                       
   while(1)                                                            
   {
       DS1302_GetTime(&time1);                              
       time[5]=(time1.Second)%10;                
       time[4]=(time1.Second)/10;                
       time[3]=(time1.Minute)%10;                
       time[2]=(time1.Minute)/10;                
       time[1]=(time1.Hour)%10;                  
       time[0]=(time1.Hour)/10;                    
           date[5]=(time1.Day)%10;
           date[4]=(time1.Day)/10;
           date[3]=(time1.Month)%10;
           date[2]=(time1.Month)/10;
           date[1]=(time1.Year)%10;
           date[0]=(time1.Year)/10;                
           if(P1_6==0)                
           {
                           delay(50);
                        if(P1_6==0)
                        {
                                flag++;
                                if(flag>7)
                                {
                                        flag=0;
                                }
                        }
                        while(P1_6==0);
                }

                switch(flag)
                {
                        case 0:display(time[0],time[1],time[2],time[3],time[4],time[5]);                
                                   break;

                        case 1:display(date[0],date[1],date[2],date[3],date[4],date[5]);                
                                   break;

                        case 2:time1.Year=button_date(time1.Year,100,99);                                                
                                   DS1302_SetTime(0x8c,time1.Year);
                                   display(date[0],date[1],10,10,10,10);
                                   break;

                        case 3:time1.Month=button_date(time1.Month,13,12);                                                
                                   DS1302_SetTime(0x88,time1.Month);
                                   display(10,10,date[2],date[3],10,10);
                                   break;

                        case 4:time1.Day=button_date(time1.Day,32,31);                                                        
                                   DS1302_SetTime(0x86,time1.Day);
                                   display(10,10,10,10,date[4],date[5]);
                                   break;

                        case 5:time1.Hour=button_time(time1.Hour,24,23);                                            
                                   DS1302_SetTime(0x84,time1.Hour);
                                   display(time[0],time[1],10,10,10,10);
                                   break;

                        case 6:time1.Minute=button_time(time1.Minute,60,59);                                    
                                   DS1302_SetTime(0x82,time1.Minute);
                                   display(10,10,time[2],time[3],10,10);
                                   break;

                        case 7:time1.Second=button_time(time1.Second,60,59);                                    
                               DS1302_SetTime(0x80,time1.Second);
                                   display(10,10,10,10,time[4],time[5]);
                                   break;
                }                 
        }
}

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