CC2640R2F: Appending data to a text file using SPIFFS.

Miroslaw Blicharz

Part Number: CC2640R2F

Hi all,

I'm attempting to do data-logging using SPIFFS system with an external Flash memory.

I started with the example SPIFFexternal from the SDK, but the example does not include appending data to an existing file.

I'm aware of SPIFFS_APPEND constant in the spiffs.h file and therefore I'm sure it is possible, but when trying to open the file such as:

fd = SPIFFS_open(&fs, "dataFile", SPIFFS_APPEND, 0); I get an error when writing to the file.

What am I doing wrong?

Best regards,

Miro

over 6 years ago

0 Clément over 6 years ago

TI__Guru** 101490 points

Hi,

You can try to increase your stack size, I have seen some cases where it was only a problem of stack size.(Please see here for a similar issue: https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/810183)

If it is not solving your issue, can you please precise which SDK version you are using?

Regards,

0 Miroslaw Blicharz over 6 years ago in reply to Clément

Prodigy 80 points

I just tried that, it doesn't seem to be doing anything.

I am using CC2640R2_SDK_3_10_00_15.

On a side note, for large amount of data would you recommend using NVS driver instead of SPIFF? Does appending slow down as the size of the file increases?

Thank you,

Miro

0 Clément over 6 years ago in reply to Miroslaw Blicharz

TI__Guru** 101490 points

Hi,

Maybe you should have a look directly on the SPIFFS’ github project (https://github.com/pellepl/spiffs/issues?utf8=%E2%9C%93&q=is%3Aissue), many issues have already been discussed.

In addition, you can test if by reserving the memory required by your whole file from the beginning could solve the problem. Try as well to get the error status returned by your faulty function.

“does appending slow down as the size of the file increases?”

I have not found sources saying something about this but keep in mind that SPIFFS is designed for small memories (< 128 MBytes) and small files.

“for large amount of data would you recommend using NVS driver instead of SPIFF”

It’s only depending on your needs. NVS is not able to handle files but is faster and lighter (SPIFF is built on the top of the NVS driver).

Regards,

Bluetooth®︎

Bluetooth forum

CC2640R2F: Appending data to a text file using SPIFFS.