nRF5340 - using NVS and LittleFS

RE: nRF5340 - using NVS and LittleFS

garrettb — Tue, 01 Jul 2025 19:11:58 GMT

thank you

RE: nRF5340 - using NVS and LittleFS

Hung Bui — Tue, 01 Jul 2025 08:21:47 GMT

Hi,
Yes, Bluetooth stack uses the settings_storage to store data (by default). I believe it's about 80 bytes per bonding. Please be noted that there is at least one page needed for garbage collection.

RE: nRF5340 - using NVS and LittleFS

garrettb — Mon, 30 Jun 2025 19:04:35 GMT

I have it working now.

I just have a basic version working which uses the code from the NVSA and the LittleFS sample applications.

My prj.conf file includes these settings:

CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_SETTINGS=y
#CONFIG_REBOOT=y


CONFIG_NVS=y
CONFIG_NVS_LOG_LEVEL_DBG=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

CONFIG_MAIN_STACK_SIZE=4096
CONFIG_LOG_MODE_MINIMAL=y
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

My pm_static.yml:

user_littlefs_storage:
address: 0xfc000
size: 0x2000
end_address: 0xfe000
placement:
before:
- end
region: flash_primary
user_nvs_storage:
address: 0xfe000
size: 0x2000
end_address: 0x100000
placement:
before:
- end
region: flash_primary

So now I can use both, it seems.

One thing I don't understand.

If I am correct, this storage area is also used by Bluetooth, for storig pairing/bonding and other information.
Is this correct?
If so, how much of this storage area is it safe to re-assign to either NVS or LittleFS?

RE: nRF5340 - using NVS and LittleFS

Hung Bui — Thu, 26 Jun 2025 11:51:58 GMT

Hi,
Please try to recover the network core by using:
nrfjprog --recover --coprocessor CP_NETWORK

You may want to recover the application core as well
nrfjprog --recover --coprocessor CP_APPLICATION

Which error do you have when you enable both NVS and LittleFS ?
Have you defined a parttition for littlefs ? You can make a pm_static.yml file (copy from a partitions.yml in build folder in littlefs sample for example, and modify it as you wish) to force a partition configuration. You can find the use of pm_static.yml in \nrf\applications\nrf_desktop\configuration\nrf52kbd_nrf52832 for example.
It should be in the project folder.

RE: nRF5340 - using NVS and LittleFS

garrettb — Wed, 25 Jun 2025 21:48:20 GMT

Also, along the way I now seem to have 'bricked' the nRF5340 DK - i.e. corrupted the network core? How do I reprogram this?