/*******************************************************************************
* Function Name: UART_SpiUartClearRxBuffer
********************************************************************************
*
* Summary:
* Clear the receive buffer and RX FIFO.
*
* Parameters:
* None
*
* Return:
* None
*
*******************************************************************************/
void UART_SpiUartClearRxBuffer(void)
{
#if(UART_INTERNAL_RX_SW_BUFFER_CONST)
uint32 intSourceMask;
#endif /* (UART_INTERNAL_RX_SW_BUFFER_CONST) */
#if(UART_CHECK_RX_SW_BUFFER)
{
intSourceMask = UART_SpiUartDisableIntRx();
UART_CLEAR_RX_FIFO;
/* Flush RX software buffer */
UART_rxBufferHead = UART_rxBufferTail;
UART_rxBufferOverflow = 0u;
/* End RX transfer */
UART_ClearRxInterruptSource(UART_INTR_RX_ALL);
UART_SpiUartEnableIntRx(intSourceMask);
}
#else
{
UART_CLEAR_RX_FIFO;
}
#endif
}
/*******************************************************************************
* Function Name: UART_UartGetByte
********************************************************************************
*
* Summary:
* Retrieves the next data element from the receive buffer, returns the
* received byte and error condition.
* - The RX software buffer is disabled: returns the data element retrieved
* from the RX FIFO. Undefined data will be returned if the RX FIFO is
* empty.
* - The RX software buffer is enabled: returns data element from the
* software receive buffer.
*
* Parameters:
* None
*
* Return:
* Bits 7-0 contain the next data element from the receive buffer and
* other bits contain the error condition.
*
* Side Effects:
* The errors bits may not correspond with reading characters due to RX FIFO
* and software buffer usage.
* RX software buffer is disabled: The internal software buffer overflow
* is not returned as status by this function.
* Check SCB_rxBufferOverflow to capture that error condition.
*
*******************************************************************************/
uint32 UART_UartGetByte(void)
{
uint32 rxData;
uint32 tmpStatus;
uint32 intSourceMask;
intSourceMask = UART_SpiUartDisableIntRx();
if(0u != UART_SpiUartGetRxBufferSize())
{
/* Enables interrupt to receive more bytes: at least one byte is in
* buffer.
*/
UART_SpiUartEnableIntRx(intSourceMask);
/* Get received byte */
rxData = UART_SpiUartReadRxData();
}
else
{
/* Reads a byte directly from RX FIFO: underflow is raised in the case
* of empty. Otherwise the first received byte will be read.
*/
rxData = UART_RX_FIFO_RD_REG;
/* Enables interrupt to receive more bytes.
* The RX_NOT_EMPTY interrupt is cleared by the interrupt routine
* in case the byte was received and read by code above.
*/
UART_SpiUartEnableIntRx(intSourceMask);
}
/* Get and clear RX error mask */
tmpStatus = (UART_GetRxInterruptSource() & UART_INTR_RX_ERR);
UART_ClearRxInterruptSource(UART_INTR_RX_ERR);
/* Puts together data and error status:
* MP mode and accept address: 9th bit is set to notify mark.
*/
rxData |= ((uint32) (tmpStatus << 8u));
return(rxData);
}
