Unable to read data from NOR flash using FlexSPI on RT1040

[rd24]

Board - iMXRT1040-EVK, SDK - mcuXpresso SDK v25.03.00, Windows, McuXpresso IDE

Hi,

I am trying to read data from the external NOR Flash on the EVK. I am using the flexspi nor edma example, but instead of using memcpy to read data I want to use "flexspi_nor_read_data()" function. Below is my code:

int main(void)
{
...
    status = flexspi_nor_read_data( EXAMPLE_FLEXSP, (EXAMPLE_FLEXSPI_AMBA_BASE + EXAMPLE_SECTOR * SECTOR_SIZE),(void*)s_nor_read_buffer,sizeof(s_nor_read_buffer));

    if (memcmp(s_nor_read_buffer, s_nor_program_buffer, sizeof(s_nor_program_buffer)) != 0)
    {
        PRINTF("Program data -  read out data value incorrect !\r\n ");
        return -1;
    }
    else
    {
        PRINTF("Program data - successfully. \r\n");
    }
...
}
status_t flexspi_nor_read_data(FLEXSPI_Type *base, uint32_t startAddress, uint32_t *buffer, uint32_t length)
{
...
    g_completionFlag = false;

    status = FLEXSPI_TransferEDMA(base, &flexspiHandle, &flashXfer);
    if (status != kStatus_Success)
    {
        return status;
    }

    /*  Wait for transfer completed. */
    while (!g_completionFlag)
    {
    }
...
}

The program goes to an infinite loop at while (!g_completionFlag) and I am getting status as 7002 as a return value from "FLEXSPI_TransferEDMA()"

I also tried the flexspi polling example, but getting the same output. 

Why would the read function not work but we are able to read using memcpy?

Thanks

[rd24 · Accepted solution]

I found the problem. I was sending incorrect address to the read function. Modified code for calling the flexspi_nor_read_data() is below.

main()
{
...
status = flexspi_nor_read_data( EXAMPLE_FLEXSPI,
                (EXAMPLE_SECTOR * SECTOR_SIZE),
		(void *)s_nor_read_buffer,			 
                sizeof(s_nor_read_buffer));
...
}

Thanks

[rd24]

By further debugging I found out when flexspi_nor_read_data() is called the EDMA IRQ Rx handler DMA1_DMA17_DriverIRQHandler() does not get called. However when reading chip ID using flexspi_nor_get_vendor_id() the DMA1_DMA17_DriverIRQHandler() is called and the read is successful. Modified flexspi_nor_get_vendor_id() is shown below. Any help is highly appreciated.

status_t flexspi_nor_get_vendor_id(FLEXSPI_Type *base, uint8_t *vendorId)
{
    uint32_t temp;
    flexspi_transfer_t flashXfer;
    flashXfer.deviceAddress = 0;
    flashXfer.port          = kFLEXSPI_PortA1;
    flashXfer.cmdType       = kFLEXSPI_Read;
    flashXfer.SeqNumber     = 1;
    flashXfer.seqIndex      = NOR_CMD_LUT_SEQ_IDX_READID;
    flashXfer.data          = &temp;
    flashXfer.dataSize      = 1;

    status_t status;
    status = FLEXSPI_TransferEDMA(base, &flexspiHandle, &flashXfer);

    if (status != kStatus_Success)
    {
        return status;
    }

    /*  Wait for transfer completed. */
    while (!g_completionFlag)
    {
    }
    *vendorId = temp;

    /* Do software reset or clear AHB buffer directly. */
#if defined(FSL_FEATURE_SOC_OTFAD_COUNT) && defined(FLEXSPI_AHBCR_CLRAHBRXBUF_MASK) && \
    defined(FLEXSPI_AHBCR_CLRAHBTXBUF_MASK)
    base->AHBCR |= FLEXSPI_AHBCR_CLRAHBRXBUF_MASK | FLEXSPI_AHBCR_CLRAHBTXBUF_MASK;
    base->AHBCR &= ~(FLEXSPI_AHBCR_CLRAHBRXBUF_MASK | FLEXSPI_AHBCR_CLRAHBTXBUF_MASK);
#else
    FLEXSPI_SoftwareReset(base);
#endif

    return status;
}

 Thanks