// Display 9999 to 0 in loop with dealy, do not display the prefix 0
void setup() {
  // put your setup code here, to run once:
  volatile char *dirf,*dirk,*dira,*dirc;
  volatile char *outf,*outk,*outa,*outc;
  volatile long a[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67};
  volatile long b[]={0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xE7};
  volatile long i,j,k,k1,k2;
  dirf = 0x30; outf = 0x31; 
  dirk = 0x107; outk = 0x108;
  dira = 0x21; outa = 0x22;
  dirc = 0x27; outc = 0x28;
  k=9;
     while(k>=1)
     {   
       k1=9;   
       while(k1>=0)
       { 
         k2=9;
         while(k2>=0)
         {
       for(i=9;i>=0;i--)
       {
        
         *outf=a[k];
         *outk=a[k1];
         *outa=a[k2];
         *outc=a[i];
         for(j=0;j<20000;j++);
       }
       k2--;
         }
       k1--;
       }
       k--;
     }
     *outc=0x00;
     k=9;
     while(k>=1)
     {
        k1=9;
        while(k1>=0)
       {
         for(i=9;i>=0;i--)
         {
           *outf=a[k];
           *outk=a[k1];
           *outa=a[i];
            for(j=0;j<20000;j++);
         }
         k1--;
       }
       k--;

     }
     *outa=0x00;
     k=9;
     while(k>=1)
     {
       k1=9;
       while(k1>=0)
       {
         for(i=9;i>=0;i--)
         {
           *outf=a[k];
           *outk=a[k1];
           for(j=0;j<20000;j++);
         }
         k1--;
       }
       k--;
     }
     *outk=0x00;
     for(i=9;i>=0;i--)
     {
       *outf=a[i];
         for(j=0;j<500000;j++);
     }
     *outf=0x00;
}
      
  
  



void loop() {
  // put your main code here, to run repeatedly:

}