int ledPos[] = {5, 6, 7, 9, 15, 10, 8, 3};

uint32_t mask, clear = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");

  RCC->AHBENR = RCC_IOPENR_GPIOAEN;

  for(int i = 0; i < 8; i++){
    mask |= (0b11 << ledPos[i] * 2);
    clear |= (0b01 << ledPos[i] * 2);
  }

  GPIOA->MODER &= ~(mask);
  GPIOA->MODER |= clear;



//this one works if i only have 1 led turns on at a time




  // GPIOA->MODER &= ~(buf);

  // GPIOA->MODER &= ~( (0b11 << (5 *2)) | (0b11 << (6 *2)));
  // GPIOA->MODER |= ( 0b01 << (5*2) | (0b01 << (6 *2)) );


  // GPIOA->ODR = (1 << 5);
  // delay(1000);
  // GPIOA->ODR = 0;
  // delay
  // GPIOA->ODR = (1 << 6);
}

uint8_t counter = 0;
uint8_t array_buf[8] = {0};

void loop() {
// counter = 5;
mask = 0;
// for(int i = 0; i < 8; i++){
// for(counter = 0; counter < 8; counter++){
 printf("number %d : \n", counter);
  for(int i = 0; i < 8; i++){

  // }
  if((counter >> 7-i) &1){
    mask |= (1 << ledPos[i]);
  }
  // mask |= (((counter >> 7-i) & 1 ) == 1 ? 1 : 0 ) << ledPos[i];
  // delay(200);
  // mask |= (array_buf[i] << ledPos[i]);
  
}

// for(int i = 0; i < 8; i++){
//   // delay(200);
//   // GPIOA->ODR &= ~(array_buf[i] << ledPos[i]);
// }
GPIOA->ODR = mask;
counter++;
  delay(200);
  // GPIOA->ODR = 0;
  // delay(100);
// delay(500);
}
// }

  //   for(int i =  0; i < 8; i++){
  //   GPIOA->ODR |= (1<<ledPos[i]);
  //   for(int x = i; x < 8;  x ++){
  //    GPIOA->ODR |= (1 << ledPos[x]);
  //    delay(200); 
  //   }
  //   GPIOA->ODR = 0;
  //   delay(100);
  //   // GPIOA->ODR =  0;
  //   // delay(500);
  // }

    // GPIOA->ODR =  0;
    // delay(500);
  // }
  // GPIOA->ODR = ~(0b11 << (5*2)) | (0b10 << (5*2));
  //   // GPIOA->BSRR = (1  << 5) | (1 << (6 + 16));

  // delay(1000); // this speeds up the simulation
  //   GPIOA->ODR = ~(0b11 << (5*2)) | (0b01 << (5*2));
  // GPIOA->BSRR = (1 << (5 + 16)) | (1 << 6);
  // GPIOA->ODR != 
  // delay(1000);