sam3x8e UART interrupt handler stub

uart_handler.c

// IT handlers
void UART_Handler(void)
{

  uint32_t status = UART->UART_SR;

  //Did we receive new byte?
  if ((status & UART_SR_RXRDY) == UART_SR_RXRDY)
  {
    //Read new byte from UART_RHR 
    uint8_t c = UART->UART_RHR;
    //Do something else
    ....
  }

  //Is transmitter is ready to send new data?
  if ((status & UART_SR_TXRDY) == UART_SR_TXRDY) 
  {
      uint8_t c = ... //
      UART->UART_THR = c;
      ...
  }

  // Acknowledge errors
  if ((status & UART_SR_OVRE) == UART_SR_OVRE || (status & UART_SR_FRAME) == UART_SR_FRAME)
  {
    //Process error
    ...
    //Reset error
    UART->UART_CR |= UART_CR_RSTSTA;
  }
}