fstorage problem when update firmware OTA

[Brunelli]

Hi, in my project I'm using fstorage library to store some information that should be kept even after the firmware update.

For this we are reserving the memory address as shown below:

NRF_FSTORAGE_DEF(nrf_fstorage_t fstorage) =
{
    .evt_handler = fstorage_evt_handler,

    .start_addr = 0x6F000,
    .end_addr   = 0x6FFFF,
};

This code was working great, but it started losing memory after an update.

What could be happening? Is it possible for this starting address to be different?

[Timor]

You need to take into account that the OTA bootloader takes the upper flash memory and below it there are a couple of pages used by the FDS depends on how your project is configured (FDS_VIRTUAL_PAGES). Make sure you are not overriding those.

For me it was best to use the provided function that calculates the flash address at run time. Use FDS_VIRTUAL_PAGES_RESERVED to define how much space you need and then use this in your flash init code as shown in the fds example:

fstorage.end_addr = nrf5_flash_end_addr_get();
fstorage.start_addr = fstorage.end_addr - (FDS_VIRTUAL_PAGES_RESERVED * FDS_VIRTUAL_PAGE_SIZE * sizeof(uint32_t));