#include "Letter.h"
void setup() {
  // put your setup code here, to run once:
    volatile char *dir_f=0x30, *dir_k=0x107,*dir_l=0x10a;
    *dir_f=0xff;
    *dir_l=0xff;
    *dir_k=0xff;
  

}

void loop() {
  // put your main code here, to run repeatedly:
    volatile char *out_f=0x31, *out_k=0x108, *out_l=0x10b;
    long i,j;
    volatile long k;
    for(i=0; i<16; i++){
      for(j=0; j<5; j++){
        *out_f=0x01 << i;
        *out_l=~(0x01 << j);
        (i>7) ? *out_k=0x01 << (i-8) : *out_k=0x00;
        for(k=0; k<100000; k++);
      }
    } 

}