status_t USART_ReadBlocking()

in lib/nxp/drivers/fsl_usart.c [527:601]

• 66 lines of code
• 15 McCabe index (conditional complexity)

status_t USART_ReadBlocking(USART_Type *base, uint8_t *data, size_t length)
{
    uint32_t statusFlag;
    status_t status = kStatus_Success;
#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif

    /* check arguments */
    assert(!((NULL == base) || (NULL == data)));
    if ((NULL == base) || (NULL == data))
    {
        return kStatus_InvalidArgument;
    }

    /* Check whether rxFIFO is enabled */
    if ((base->FIFOCFG & USART_FIFOCFG_ENABLERX_MASK) == 0U)
    {
        return kStatus_Fail;
    }
    for (; length > 0U; length--)
    {
        /* loop until rxFIFO have some data to read */
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
        while (((base->FIFOSTAT & USART_FIFOSTAT_RXNOTEMPTY_MASK) == 0U) && (--waitTimes != 0U))
#else
        while ((base->FIFOSTAT & USART_FIFOSTAT_RXNOTEMPTY_MASK) == 0U)
#endif
        {
        }
#if UART_RETRY_TIMES
        if (waitTimes == 0U)
        {
            status = kStatus_USART_Timeout;
            break;
        }
#endif
        /* check rxFIFO statusFlag */
        if ((base->FIFOSTAT & USART_FIFOSTAT_RXERR_MASK) != 0U)
        {
            base->FIFOCFG |= USART_FIFOCFG_EMPTYRX_MASK;
            base->FIFOSTAT |= USART_FIFOSTAT_RXERR_MASK;
            status = kStatus_USART_RxError;
            break;
        }
        /* check receive statusFlag */
        statusFlag = base->STAT;
        /* Clear all status flags */
        base->STAT |= statusFlag;
        if ((statusFlag & USART_STAT_PARITYERRINT_MASK) != 0U)
        {
            status = kStatus_USART_ParityError;
        }
        if ((statusFlag & USART_STAT_FRAMERRINT_MASK) != 0U)
        {
            status = kStatus_USART_FramingError;
        }
        if ((statusFlag & USART_STAT_RXNOISEINT_MASK) != 0U)
        {
            status = kStatus_USART_NoiseError;
        }

        if (kStatus_Success == status)
        {
            *data = (uint8_t)base->FIFORD;
            data++;
        }
        else
        {
            break;
        }
    }
    return status;
}