IMXRT1024 LPUART Handler Passing Parameter Fail

[Lukas_Frank]

Hi Dear Authorized,

I am just trying to pass my own pointer struct as parameter to the "EXAMPLE_LPUART_IRQHandler" method.

In default SDK example of LPUART EDMA Ring Buffer :

...
..
.
#define EXAMPLE_LPUART_IRQHandler      LPUART1_IRQHandler
#define EXAMPLE_LPUART_IRQn            LPUART1_IRQn
.
..
...
void EXAMPLE_LPUART_IRQHandler(void)
{
    uint32_t status            = LPUART_GetStatusFlags(EXAMPLE_LPUART);
    uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(EXAMPLE_LPUART);

    /* If new data arrived. */
    if ((0U != ((uint32_t)kLPUART_IdleLineFlag & status)) &&
        (0U != ((uint32_t)kLPUART_IdleLineInterruptEnable & enabledInterrupts)))
    {
        (void)LPUART_ClearStatusFlags(EXAMPLE_LPUART, kLPUART_IdleLineFlag);
        isIdleLineDetected = true;
        receivedBytes      = EXAMPLE_RING_BUFFER_SIZE -
                        EDMA_GetRemainingMajorLoopCount(EXAMPLE_LPUART_DMA_BASEADDR, LPUART_RX_DMA_CHANNEL);
        receivedBytes += (EXAMPLE_RING_BUFFER_SIZE * ringBufferFlag) - ringBufferIndex;

        if (receivedBytes > 32U)
        {
            __NOP();
        }
    }
    LPUART_TransferEdmaHandleIRQ(EXAMPLE_LPUART, &g_lpuartEdmaHandle);
    SDK_ISR_EXIT_BARRIER;
}

What I am trying to do:

void EXAMPLE_LPUART_IRQHandler(myStruct* myStruct_param)
{
        ...
        ..
        .   
        myStruct_param->isIdleLineDetected = true;
        myStruct_param->receivedBytes      = EXAMPLE_RING_BUFFER_SIZE - EDMA_GetRemainingMajorLoopCount(EXAMPLE_LPUART_DMA_BASEADDR, LPUART_RX_DMA_CHANNEL);
        myStruct_param->receivedBytes += (EXAMPLE_RING_BUFFER_SIZE * ringBufferFlag) - myStruct_param->ringBufferIndex;

        if (myStruct_param->receivedBytes > 32U)
        {
            __NOP();
        }
    }
    LPUART_TransferEdmaHandleIRQ(EXAMPLE_LPUART, &g_lpuartEdmaHandle);
    SDK_ISR_EXIT_BARRIER;
}

I just manupulate "WEAK LPUART1_IRQHandler" with parameters but it didn't work. Comments says it can be only override. How do we overload this method as stated above?

Thanks and Regards.

[danielchen · Accepted solution]

Hi

No parameters can be explicitly passed to an interrupt handler because it is designed to be called by the hardware.

Regards

Daniel

[Lukas_Frank]

Thank you @danielchen