How work exactly the MFS?

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How work exactly the MFS?

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arnogir
Senior Contributor II

Hello

I'm using MQX 4.1 on K70 with an external Nandflash linked to the NFC.

I open this device and mount a device ("a:") and then use to store a big file resource used by PEG (400 000 Bytes)

Also, for my application, I want save some parameter in a file.

Then I open a file, save some data and close the file.

But after a power off/On, data are note saved in the file. I must close the MFS.

But I think If I close to re open, My PEG resource could not run correctly..

Is mandatory to close the MFS to save definitely a file into the Nandflash?

How work the MFS? When data are realy saved in the nandflash?

Thanks

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arnogir
Senior Contributor II

Hello

Flush memory is the good solution!

View solution in original post

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arnogir
Senior Contributor II

Hello

No body to inform me?:smileycry:

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arnogir
Senior Contributor II

Is IOCtl Flush will resolved my problem?

If yes, should I do it on file handle or on mfs handle?

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DavidS
NXP Employee
NXP Employee

Hi Arno,

Are you running the FFS with the MFS to access NAND flash?

NAND flash requires FFS (flash file system with wearleveling).

FFS has a fflush command using filesystem_handle:

/TASK

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arnogir
Senior Contributor II

Hi

I'm using the following code to open the  flash.

if (_io_nandflash_wl_install(&_bsp_nandflash_wl_init, FFS_DEVICE) != MQX_OK) { printf("Can't install FFS!\n"); // _task_block();   } else { if (nandflash_handle == NULL) { /* Open nand flash wl in normal mode */ nandflash_handle = fopen(FFS_DEVICE, NANDWL_OPEN_NORMAL); if ( nandflash_handle == NULL ) { printf("Unable to open NAND Flash device.\n"); printf("\nYou must run \"ffs_repair\" command\n"); return -1; } /* Install MFS over nand_wl driver */ error_code = _io_mfs_install(nandflash_handle, filesystem_name, (_file_size)0); if (error_code != MFS_NO_ERROR) { printf("Error initializing MFS: %s\n", MFS_Error_text((uint32_t)error_code)); return -1; } if (filesystem_handle == NULL) { /* Open file system */ filesystem_handle = fopen(filesystem_name, NULL); error_code = ferror (filesystem_handle); if ((error_code != MFS_NO_ERROR) && (error_code != MFS_NOT_A_DOS_DISK)) { printf("Error opening filesystem: %s\n", MFS_Error_text((uint32_t)error_code)); return -1; } printf ("NAND flash installed to %s\n", filesystem_name); if ( error_code == MFS_NOT_A_DOS_DISK ) { printf("NOT A DOS DISK! Format will start.\n"); error_code = ioctl(filesystem_handle,IO_IOCTL_DEFAULT_FORMAT,NULL); if (error_code != MFS_NO_ERROR) { printf("Format finish with error code 0x%X", error_code); } else { printf("Format finish"); } return 0; } } else { printf("\nNAND flash was installed.\n"); } } else { printf("\nNAND flash device was opened.\n"); } return 0; }

After that I open a file by using path "a:/file.x"...

This answer to your question?

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arnogir
Senior Contributor II

Hello

Flush memory is the good solution!

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skteh
Contributor III

Hi Arnaud,

How you flush you memory?

I tried fflush(filesystem_handle), but it doesn't save.

After power off, the file gone.

Thankx

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arnogir
Senior Contributor II

I do fflush only:

returnCode = fflush(My MQX_FILE_PTR)

Test the return code if return MQX_OK or other?

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