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zephyr/samples/subsys/nvs
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Derek Snell 2dc9c2b360 samples: subsys: nvs: add testcase for MCXN947 internal flash 
For boards frdm_mcxn947 and mcx_n9xx_evk test NVS in internal flash in
addition to external QSPI flash.  Also enable the NVS subsystem on
these boards for Twister.

Signed-off-by: Derek Snell <derek.snell@nxp.com>
2025-05-31 05:57:40 -04:00
..
boards tests, samples: update esp32_devkitc board records 2025-04-29 16:48:55 +02:00
nxp samples: subsys: nvs: add testcase for MCXN947 internal flash 2025-05-31 05:57:40 -04:00
socs samples: esp32c3: Add USB variant 2025-01-10 18:57:07 +01:00
src sample: nvs: add NVS sample Kconfig 2025-03-17 13:57:54 +01:00
CMakeLists.txt
Kconfig sample: nvs: add NVS sample Kconfig 2025-03-17 13:57:54 +01:00
prj.conf samples: nvs: set MAIN_STACK_SIZE in prj.conf 2025-04-18 12:36:36 +02:00
README.rst doc: fix trivial typo 2024-09-05 09:49:18 +02:00
sample.yaml samples: subsys: nvs: add testcase for MCXN947 internal flash 2025-05-31 05:57:40 -04:00

README.rst 

.. zephyr:code-sample:: nvs
   :name: Non-Volatile Storage (NVS)
   :relevant-api: nvs_high_level_api

   Store and retrieve data from flash using the NVS API.

Overview
********

This is a simple application demonstrating use of the NVS
module for non-volatile (flash) storage.  In this application,
a counter is incremented on every reboot and stored in flash,
the application reboots, and the reboot counter data is retrieved.

Requirements
************

* A board with flash support

Building and Running
********************

This sample can be found under :zephyr_file:`samples/subsys/nvs` in the Zephyr tree.

The sample can be built for several platforms, the following commands build the
application for the nrf51dk/nrf51822 board.

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/nvs
   :board: nrf51dk/nrf51822
   :goals: build flash
   :compact:

After flashing the image to the board the output on the console shows the
reboot counter and the boards reboots several times to show the reboot counter
is incremented.

Sample Output
=============

.. code-block:: console

   ***** Booting Zephyr OS v1.12.0-rc1-176-gf091be783 *****
   [fs/nvs] [DBG] nvs_reinit: (Re)Initializing sectors
   [fs/nvs] [DBG] _nvs_sector_init: f->write_location set to c
   [fs/nvs] [INF] nvs_mount: maximum storage length 256 byte
   [fs/nvs] [INF] nvs_mount: write-align: 1, write-addr: c
   [fs/nvs] [INF] nvs_mount: entry sector: 0, entry sector ID: 1
   No address found, adding 192.168.1.1 at id 1
   No key found, adding it at id 2
   No Reboot counter found, adding it at id 3
   Id: 4 not found, adding it
   Longarray not found, adding it as id 4
   Reboot counter history: ...0
   Oldest reboot counter: 0
   Rebooting in ...5...4...3...2...1
   ***** Booting Zephyr OS v1.12.0-rc1-176-gf091be783 *****
   [fs/nvs] [INF] nvs_mount: maximum storage length 256 byte
   [fs/nvs] [INF] nvs_mount: write-align: 1, write-addr: c7
   [fs/nvs] [INF] nvs_mount: entry sector: 0, entry sector ID: 1
   Entry: 1, Address: 192.168.1.1
   Id: 2, Key: ff fe fd fc fb fa f9 f8
   Id: 3, Reboot_counter: 1
   Id: 4, Data: DATA
   Id: 5, Longarray: 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13 14 15 16 17 18
   Reboot counter history: ...1...0
   Oldest reboot counter: 0
   Rebooting in ...5...4...3...2...1
   ...