Hyperflash non blocking transfer causing instruction access violation

Abstractsig — Thu, 07 Apr 2022 01:12:54 GMT

I am testing the imxrt1050evbk with the flexspi hyper flash polling transfer example.

I have modified the function flexspi_nor_flash_erase_sector() to use FLEXSPI_TransferNonBlocking() instead of FLEXSPI_TransferBlocking() as shown below.

When I do this I get an instruction access violation when execution returns from the FLEXSPI_TransferNonBlocking() call. However if I put a debug breakpoint after this call and manually continue each loop I do not get the fault.

Any hints on what might be causing this or suggestions on how I might further debug my example would be appreciated.

Thanks

volatile bool ___done;

void
flexspi_transfer_callback_1 (FLEXSPI_Type *base,flexspi_handle_t *handle,status_t status,void *userData) {
___done = true;
}

flexspi_handle_t es_handle;

status_t flexspi_nor_flash_erase_sector_nb (FLEXSPI_Type *base, uint32_t address)
{
status_t status;
flexspi_transfer_t flashXfer;

/* Write enable */
status = flexspi_nor_write_enable(base, address);

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

flashXfer.deviceAddress = address;
flashXfer.port = kFLEXSPI_PortA1;
flashXfer.cmdType = kFLEXSPI_Command;
flashXfer.SeqNumber = 4;
flashXfer.seqIndex = HYPERFLASH_CMD_LUT_SEQ_IDX_ERASESECTOR;

FLEXSPI_TransferCreateHandle(base,&es_handle,flexspi_transfer_callback_1,NULL);

___done = false;
FLEXSPI_TransferNonBlocking (base,&es_handle,&flashXfer);

size_t count;

while ( FLEXSPI_TransferGetCount (base,&es_handle,&count) != kStatus_NoTransferInProgress);

/* Do software reset. */
FLEXSPI_SoftwareReset(EXAMPLE_FLEXSPI);

return status;
}

Re: Hyperflash non blocking transfer causing instruction access violation

Abstractsig — Thu, 07 Apr 2022 03:28:11 GMT

In answer to my own question.

It seems the fault occurs because the example puts the interrupt vector table in flash.

Moving the vector table to ram stops the access violation fault.

Re: Hyperflash non blocking transfer causing instruction access violation

RajPadmani — Fri, 11 Oct 2024 05:47:48 GMT

Hi,
I am working on km34 for the flash read/write operation while continuous interrupts of ADC and timer (1 ms) but it shows it goes into hardflaut error, so i move my vector table to ram but still not able to flash operation and code continuous reset.

topic Re: Hyperflash non blocking transfer causing instruction access violation in i.MX RT Crossover MCUs

Hyperflash non blocking transfer causing instruction access violation

Re: Hyperflash non blocking transfer causing instruction access violation

Re: Hyperflash non blocking transfer causing instruction access violation