Hi, sorry for the delayed response.

This seems like an error in the LVGL library, not ESP-IDF itself.

I would recommend switching to the POSIX FS driver and using ESP-IDFs vfs and fatfs support, if at all possible.

Hi,
Just to clarify the rest of the data is lost fully, not just received in the next call to read?

I tried replicating your issue with the following code, but was unable to.

Does your code look something like this?


#include <stdio.h>
#include <inttypes.h>
#include "hal/uart_types.h"
#include ...

Hi,

you can read from the NVS in bootloader (Docs, Example).

Unfortunately, writing or erasing NVS data from the bootloader is currently not supported.

Hi,
there is a official driver for NAND flashes: https://components.espressif.com/compon ... nand_flash
Depending on your flash model, this might work out of the box.

If that doesn't help, could you please post the model of your Flash, so we can assist you further?

Thank you.

If you want circular buffer, going directly to the flash would probably be easiest.
However it might be beneficial to go through FATFS, or other FS simply for host compatibility.

What to look out for:


Don't use raw flash directly, use idf provided Wear_leveling component, or implement some other ...

Hi,
could you please post link to your repo/minimal setup, so we can better help you.
Thank you.