//my own tryto find 4 digit function 17-11-2022
void setup() {
  // put your setup code here, to run once:
    volatile char *dirf,*dirk;
    volatile char *outf,*outk;
    volatile long i=0,j;
    volatile char numcc[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67};
    volatile char numca[]={0xC0,0xF9,0xA4,0xB0,0X99,0X92,0X82,0xF8,0x80,0x98};
    dirf = 0x30; dirk = 0x017;
    *dirf =0xff; *dirk=0x0f;
     outf = 0x31; outk=0x108;
   while(1)
   {
     *outk=0x0f;
     if(i<10)
     {
     *outf=numca[i];
     for(j=0;j<500000;j++);
     i++;
     }
     
   }

}

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

}