70 lines
2.3 KiB
ReStructuredText
70 lines
2.3 KiB
ReStructuredText
.. zephyr:code-sample:: nvs
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:name: Non-Volatile Storage (NVS)
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:relevant-api: nvs_high_level_api
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Store and retrieve data from flash using the NVS API.
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Overview
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********
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This is a simple application demonstrating use of the NVS
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module for non-volatile (flash) storage. In this application,
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a counter is incremented on every reboot and stored in flash,
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the application reboots, and the reboot counter data is retrieved.
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Requirements
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************
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* A board with flash support
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Building and Running
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********************
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This sample can be found under :zephyr_file:`samples/subsys/nvs` in the Zephyr tree.
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The sample can be build for several platforms, the following commands build the
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application for the nrf51dk_nrf51422 board.
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.. zephyr-app-commands::
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:zephyr-app: samples/subsys/nvs
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:board: nrf51dk_nrf51422
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:goals: build flash
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:compact:
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After flashing the image to the board the output on the console shows the
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reboot counter and the boards reboots several times to show the reboot counter
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is incremented.
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Sample Output
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=============
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.. code-block:: console
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***** Booting Zephyr OS v1.12.0-rc1-176-gf091be783 *****
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[fs/nvs] [DBG] nvs_reinit: (Re)Initializing sectors
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[fs/nvs] [DBG] _nvs_sector_init: f->write_location set to c
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[fs/nvs] [INF] nvs_mount: maximum storage length 256 byte
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[fs/nvs] [INF] nvs_mount: write-align: 1, write-addr: c
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[fs/nvs] [INF] nvs_mount: entry sector: 0, entry sector ID: 1
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No address found, adding 192.168.1.1 at id 1
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No key found, adding it at id 2
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No Reboot counter found, adding it at id 3
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Id: 4 not found, adding it
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Longarray not found, adding it as id 4
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Reboot counter history: ...0
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Oldest reboot counter: 0
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Rebooting in ...5...4...3...2...1
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***** Booting Zephyr OS v1.12.0-rc1-176-gf091be783 *****
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[fs/nvs] [INF] nvs_mount: maximum storage length 256 byte
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[fs/nvs] [INF] nvs_mount: write-align: 1, write-addr: c7
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[fs/nvs] [INF] nvs_mount: entry sector: 0, entry sector ID: 1
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Entry: 1, Address: 192.168.1.1
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Id: 2, Key: ff fe fd fc fb fa f9 f8
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Id: 3, Reboot_counter: 1
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Id: 4, Data: DATA
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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
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Reboot counter history: ...1...0
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Oldest reboot counter: 0
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Rebooting in ...5...4...3...2...1
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...
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