status_t USART_WriteBlocking()

in lib/nxp/drivers/fsl_usart.c [457:509]

• 49 lines of code
• 14 McCabe index (conditional complexity)

status_t USART_WriteBlocking(USART_Type *base, const uint8_t *data, size_t length)
{
    /* Check arguments */
    assert(!((NULL == base) || (NULL == data)));
#if UART_RETRY_TIMES
    uint32_t waitTimes;
#endif
    if ((NULL == base) || (NULL == data))
    {
        return kStatus_InvalidArgument;
    }
    /* Check whether txFIFO is enabled */
    if (0U == (base->FIFOCFG & USART_FIFOCFG_ENABLETX_MASK))
    {
        return kStatus_InvalidArgument;
    }
    for (; length > 0U; length--)
    {
        /* Loop until txFIFO get some space for new data */
#if UART_RETRY_TIMES
        waitTimes = UART_RETRY_TIMES;
        while ((0U == (base->FIFOSTAT & USART_FIFOSTAT_TXNOTFULL_MASK)) && (--waitTimes != 0U))
#else
        while (0U == (base->FIFOSTAT & USART_FIFOSTAT_TXNOTFULL_MASK))
#endif
        {
        }
#if UART_RETRY_TIMES
        if (0U == waitTimes)
        {
            return kStatus_USART_Timeout;
        }
#endif
        base->FIFOWR = *data;
        data++;
    }
    /* Wait to finish transfer */
#if UART_RETRY_TIMES
    waitTimes = UART_RETRY_TIMES;
    while ((0U == (base->STAT & USART_STAT_TXIDLE_MASK)) && (--waitTimes != 0U))
#else
    while (0U == (base->STAT & USART_STAT_TXIDLE_MASK))
#endif
    {
    }
#if UART_RETRY_TIMES
    if (0U == waitTimes)
    {
        return kStatus_USART_Timeout;
    }
#endif
    return kStatus_Success;
}