bool InitUart(int baudRate)
{
  if (baudRate != 38400)
    return false;
  
  if ((RCC->APB1ENR & RCC_APB1ENR_USART2EN) == 0)
  { // not running yet ?
    RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
    RCC->APB1RSTR |= RCC_APB1RSTR_USART2RST;
    RCC->APB1RSTR &= ~RCC_APB1RSTR_USART2RST;
  }
  
  USART2->CR1 = USART_CR1_RE | USART_CR1_TE;
  USART2->CR2 = 0;
  USART2->CR3 = 0;
  
  {           //TODO - calculate BRR from apb1clock
    USART2->BRR = 0x03AA;
  }

  USART2->CR1 |= USART_CR1_UE;

  InitIOPort(GPIOD, 5, portALTOUT);     // TX = PD5
  InitIOPort(GPIOD, 6, portINPUT);      // RX = PD6

  {           // AFIO->REMAP
    if ((RCC->APB2ENR & RCC_APB2ENR_AFIOEN) == 0)
    { // not running yet ?
      RCC->APB2ENR |= RCC_APB2ENR_AFIOEN;
      RCC->APB2RSTR |= RCC_APB2RSTR_AFIORST;
      RCC->APB2RSTR &= ~RCC_APB2RSTR_AFIORST;
    }
    
    AFIO->MAPR |= AFIO_MAPR_USART2_REMAP;
  }
  
  return true;
}