uint8_t outputPins[8] = {PIN4_bm, PIN5_bm, PIN6_bm, PIN7_bm, PIN3_bm, PIN2_bm, PIN1_bm, PIN0_bm};
uint8_t* pinPortsOut[8] = {&PORTA.OUT, &PORTA.OUT, &PORTA.OUT, &PORTA.OUT, &PORTB.OUT, &PORTB.OUT, &PORTB.OUT, &PORTB.OUT};
uint8_t* pinPortsDir[8] = {&VPORTA.DIR, &VPORTA.DIR, &VPORTA.DIR, &VPORTA.DIR, &VPORTB.DIR, &VPORTB.DIR, &VPORTB.DIR, &VPORTB.DIR};
void initiatePinModes(){
  for(int pinNum = 0; pinNum<8; pinNum++){
    *pinPortsDir[pinNum] |= outputPins[pinNum];
  }
}

void writeBit(uint8_t srcValue, uint8_t bitPosition){
  if((srcValue & (1 << bitPosition))){
    *pinPortsOut[7-bitPosition] |= outputPins[7-bitPosition];
  }
  else{
    *pinPortsOut[7-bitPosition] &= ~outputPins[7-bitPosition];
  }
}

void writeOutput(uint8_t value){
  for(int pinNum = 0; pinNum<8; pinNum++){
    writeBit(value, pinNum);
  }
}

void setup() {
  initiatePinModes();
}

void loop() {
  for(uint8_t i = 0; i < 64; i+=1){
    writeOutput(i);
    delay(5);
  }
  
}