How work exactly the MFS?

[arnogir]

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

[arnogir]

Hello

No body to inform me?:smileycry:

[arnogir]

Is IOCtl Flush will resolved my problem?

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

[DavidS]

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

[arnogir]

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?

[arnogir · Accepted solution]

Hello

Flush memory is the good solution!

[skteh]

Hi Arnaud,

How you flush you memory?

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

After power off, the file gone.

Thankx

[arnogir]

I do fflush only:

returnCode = fflush(My MQX_FILE_PTR)

Test the return code if return MQX_OK or other?