int b = 0;
int r = 0;

void setup() {
  GPIOB->MODER = 0x15554;
  GPIOA->MODER = 0x5;
  pinMode(PB0, INPUT_PULLDOWN);
}

void loop() {
  if(digitalRead(PB0)==1){
    GPIOB->ODR = 0;
    b += 1;
    if (b == 7){
      b = 0;
    }
    delay(500);
    r = 0;
  }
  switch(b){
    case 0:
      GPIOB->ODR = 0;
      GPIOA->ODR = 0;
    break;
    case 1:
      GPIOA->ODR = 3;
      GPIOB->ODR = 0x1FE;
    break;
    case 2:
      GPIOB->ODR = 0x1E;
    break;
    case 3:
      GPIOB->ODR = 0x1E0;
    break;
    case 4:
      if(r == 0){
        delay(100);
        GPIOB->ODR = 0xAA;
        r++;
      }
      else{
        delay(100);
        GPIOB->ODR = 0x154;
        r = 0;
      }
    break;
    case 5:
      if(r == 0){
        delay(100);
        GPIOB->ODR = 0xA;
        r++;
      }
      else{
        delay(100);
        GPIOB->ODR = 0x14;
        r = 0;
      }
    break;
    case 6:
      if(r == 0){
        delay(100);
        GPIOB->ODR = 0xA0;
        r++;
      }
      else{
        delay(100);
        GPIOB->ODR = 0x140;
        r = 0;
      }
    break;
  }
}