CC3235SF: Questions about filesystem

Kevin Guimaraes

Part Number: CC3235SF

Hello,

I have some doubts regarding the CC3235SF file system that I could not find in the documentation.

What happens when I call the sl_FsWrite function to write 1 byte? Does it write only 1 byte in the flash? Does it put that byte in RAM and wait for 4K bytes of the block to write it all together? Does it write the entire 4K byte block every time I write 1 byte?

Another question is regarding the file allocation table, every time I write this byte is the table updated? Or is it updated only when I close the file?

Thanks,

Kevin.

over 3 years ago

+1 Kobi Leibovitch over 3 years ago

TI__Guru 61416 points

Hi Kevin,

It is not very efficient to write 1B at a time but it should be fine. The byte will be written to the flash immediately. The updated length of the file will be stored in RAM (cache) until the next sl_Stop command (and then it will be stored in the file header).

the FAT table is updated when the file is created, deleted or renamed. The FAT entry mostly stores static info about the file.

Br,

Kobi

0 Kevin Guimaraes over 3 years ago in reply to Kobi Leibovitch

Intellectual 360 points

Hi Kobi, thanks for the anwser.

The updated length of the file will be updated only with de sl_Stop? When I close the file it will not be updated?

0 Kobi Leibovitch over 3 years ago in reply to Kevin Guimaraes

TI__Guru 61416 points

It will only be updated (to flash) upon sl_Stop (avoiding redundant write cycles to prevent risking the flash endurance).

0 Kevin Guimaraes over 3 years ago in reply to Kobi Leibovitch

Intellectual 360 points

Do you mean even if I close the file if in case of an unexpected or sudden shutdown the file can be treated as invalid?

0 Kobi Leibovitch over 3 years ago in reply to Kevin Guimaraes

TI__Guru 61416 points

Yes, that's possible.

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CC3235SF: Questions about filesystem