void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  assert_param(IS_GPIO_PIN(GPIO_Pin));
  
  GPIOx->BSRR = GPIO_Pin;
}

...
void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  assert_param(IS_GPIO_PIN(GPIO_Pin));
  
  GPIOx->BRR = GPIO_Pin;
}

typedef struct
{
uint32_t PushIndx;
uint32_t PopIndx;
uint8_t Buffer[UART_FIFO_SIZE];
} UartFifo_t;

inline static bool FifoPush( UartFifo_t* Fifo, uint8_t Data)
{
// calculate next push index
uint32_t IndxTmp = Fifo->PushIndx + 1;
if( IndxTmp == UART_FIFO_SIZE )
IndxTmp = 0;

if (IndxTmp == Fifo->PopIndx) // Check FIFO state
return(false); // The FIFO is full

Fifo->Buffer[Fifo->PushIndx] = Data; // Push the data

Fifo->PushIndx = IndxTmp; // Updating the push's index
return(true);
}

static bool FifoPop( UartFifo_t *Fifo, uint8_t *pData)
{
if (Fifo->PushIndx == Fifo->PopIndx) // Check FIFO state
return(false);// The FIFO is empty

*pData = Fifo->Buffer[Fifo->PopIndx]; // Pop the data

// Calculate the next pop index
uint32_t IndxTmp = Fifo->PopIndx + 1;
if( IndxTmp == UART_FIFO_SIZE )
IndxTmp = 0;
Fifo->PopIndx = IndxTmp; // Updating of the pop's index
return(true);
}