S32K322 DMA request

[vignesh3]

How can I know that if peripherals are requesting to the DMA channel or not ?

[vignesh3]

Hi @Julián_AragónM ,

I am getting the interrupt but the data not present in the RxBuff array.

can you help me with this I am attaching the code below.

void uartRxDmaReqCallBack(void)

{

while(0);

}

int main(void)

{

    /* Write your code here */

//clock init

Clock_Ip_Init(Clock_Ip_aClockConfig);

Siul2_Port_Ip_Init(NUM_OF_CONFIGURED_PINS_PortContainer_0_BOARD_InitPeripherals,g_pin_mux_InitConfigArr_PortContainer_0_BOARD_InitPeripherals);

    IntCtrl_Ip_InstallHandler(DMATCD2_IRQn, uartRxDmaReqCallBack, NULL_PTR);

    IntCtrl_Ip_EnableIrq(DMATCD2_IRQn);

    IntCtrl_Ip_Init(&IntCtrlConfig_1);

    /* init DMA */

Dma_Ip_Init(&Dma_Ip_xDmaInitPB);

/* Initialize DMAMUX via HLD RM driver */

Rm_Init(&Rm_Config_BOARD_INITPERIPHERALS);

Lpuart_Uart_Ip_Init(0U,&Lpuart_Uart_Ip_xHwConfigPB_0_BOARD_INITPERIPHERALS);

Lpuart_Uart_Ip_AsyncReceive(0U,RxBuff,10);

    //S32_NVIC->ISPR[(uint32)(DMATCD2_IRQn) >> 5U] = (uint32)(1UL << ((uint32)(DMATCD2_IRQn) & (uint32)0x1FU));

    for(;;)

    {

    Siul2_Dio_Ip_WritePin(LED_PORT,LED_PIN,true);

    delay();

    Siul2_Dio_Ip_WritePin(LED_PORT,LED_PIN,false);

    delay();

        if(exit_code != 0)

        {

            break;

        }

    }

    return exit_code;

}

[Julián_AragónM]

Hi @vignesh3,

If DMA is reporting data transfer, but you cannot see it, it may be an issue with the cache. Try adding "__attribute__((section(".mcal_bss_no_cacheable")))" to your Tx and Rx buffers. Also, MPU_ENABLE needs to be added if not included already:

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Best regards,
Julián

[Julián_AragónM]

Hi @vignesh3,

I assume you are trying to check if a DMA transfer has happened? You can configure an interrupt for the following events: 

1. The major loop is half complete (INTHALF)
2. The major loop is complete (INTMAJOR)
3. A configuration error occurs (EEI)

You can check with the first two if any major loop has been completed after requesting a transfer. You can also check the CHn_CSR field for the ACTIVE & DONE fields. 

• ACTIVE Status field indicating the channel is currently in execution
• DONE Status field indicating major loop completion (cleared by software when a channel begins execution)

Please refer to chapter 15.5.6 Monitoring transfer descriptor status from the S32K3XX's Reference Manual as it describes how to monitor the eDMA status.

Best regards,
Julián