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How to increase the ECSPI of imx8mmini baud rate to 52Mbps?

hi

For the M4 core of i.MX8M Mini, using the ECSPI peripheral with SDMA to read data at a rate of 32 Mbps (the datasheet says the maximum ECSPI rate is 52 Mbps), the example used is "SDK_2.5.0/boards/evkmimx8mm/cmsis_driver_examples/ecspi/sdma_loopback_transfer". However, this example reinitializes both SPI and DMA for each data read, wasting a lot of time. Which functions and statements do not need to be reinitialized in the ECSPI_MasterTransferSDMA function? Also, I have increased the clock frequency, but the issue remains the same.now my code below:

status_t ECSPI_MasterTransferSDMA(ECSPI_Type *base, ecspi_sdma_handle_t *handle, ecspi_transfer_t *xfer)

{

// assert(base && handle && xfer);

// sdma_transfer_config_t xferConfig = {0U};

// sdma_peripheral_t perType = kSDMA_PeripheralNormal;

/* Check if ECSPI is busy */

if (handle->state == kECSPI_Busy)

{

return kStatus_ECSPI_Busy;

}

/* Check if the input arguments valid */

if (((xfer->txData == NULL) && (xfer->rxData == NULL)) || (xfer->dataSize == 0U))

{

return kStatus_InvalidArgument;

}

// if(test_init_flg == 0)

{

ECSPI_Enable(base, true);

}

handle->state = kECSPI_Busy;

if(test_init_flg == 0)

{

ECSPI_SetChannelSelect(base, xfer->channel);

}

#if defined(FSL_FEATURE_SOC_SPBA_COUNT) && (FSL_FEATURE_SOC_SPBA_COUNT > 0)

if(test_init_flg == 0)

{

bool isSpba = SDMA_IsPeripheralInSPBA((uint32_t)base);

/* Judge if the instance is located in SPBA */

if (isSpba)

{

perType = kSDMA_PeripheralNormal_SP;

}

#endif /* FSL_FEATURE_SOC_SPBA_COUNT */

if(test_init_flg == 0)

{

/* Prepare transfer. */

SDMA_PrepareTransfer(&xferConfig, (uint32_t)xfer->txData, (uint32_t) & (base->TXDATA), sizeof(uint8_t),

sizeof(uint8_t), sizeof(uint8_t), xfer->dataSize, handle->txSdmaHandle->eventSource, perType,

kSDMA_MemoryToPeripheral);

}

/* Submit transfer. */

SDMA_SubmitTransfer(handle->txSdmaHandle, &xferConfig);

if(test_init_flg == 0)

{

/* Prepare transfer. */

SDMA_PrepareTransfer(&xferConfig2, (uint32_t) & (base->RXDATA), (uint32_t)xfer->rxData, sizeof(uint8_t),

sizeof(uint8_t), sizeof(uint8_t), xfer->dataSize, handle->rxSdmaHandle->eventSource, perType,

kSDMA_PeripheralToMemory);

}

/* Submit transfer. */

SDMA_SubmitTransfer(handle->rxSdmaHandle, &xferConfig2);

/* Start Rx transfer */

handle->rxInProgress = true;

SDMA_StartTransfer(handle->rxSdmaHandle);

ECSPI_EnableDMA(base, kECSPI_RxDmaEnable, true);

/* Start Tx transfer */

handle->txInProgress = true;

SDMA_StartTransfer(handle->txSdmaHandle);

ECSPI_EnableDMA(base, kECSPI_TxDmaEnable, true);

test_init_flg=1;

return kStatus_Success;

}

void main(void)

{

...

while(1)

{

DRIVER_MASTER_SPI.Transfer(masterTxData, masterRxData, TRANSFER_SIZE);//call ECSPI_MasterTransferSDMA

/* Wait slave received all data. */

while (!isTransferCompleted)

{

}

...

}

回复： How to increase the ECSPI of imx8mmini baud rate to 52Mbps?

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Re: How to increase the ECSPI of imx8mmini baud rate to 52Mbps?

Hello @sofia_0571

Hope you are doing very well.

You can try instead of bypassing the setup using a flag inside the function, keep ECSPI_MasterTransferSDMA purely for your high-speed loop by stripping out the heavy lifting. Create a "Fast Trigger" function that assumes preparation is already complete.

Something like:

status_t ECSPI_MasterTransferSDMA_FastTrigger(ECSPI_Type *base, ecspi_sdma_handle_t *handle, uint32_t size)
{
    handle->state = kECSPI_Busy;

    xferConfig.dataSize = size;
    xferConfig2.dataSize = size;
    
    SDMA_SubmitTransfer(handle->txSdmaHandle, &xferConfig);
    SDMA_SubmitTransfer(handle->rxSdmaHandle, &xferConfig2);

    handle->rxInProgress = true;
    SDMA_StartTransfer(handle->rxSdmaHandle);
    ECSPI_EnableDMA(base, kECSPI_RxDmaEnable, true);

    handle->txInProgress = true;
    SDMA_StartTransfer(handle->txSdmaHandle);
    ECSPI_EnableDMA(base, kECSPI_TxDmaEnable, true);

    return kStatus_Success;
}

Best regards,

Salas.