zephyr

History

Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int As both C and C++ standards require applications running under an OS to return 'int', adapt that for Zephyr to align with those standard. This also eliminates errors when building with clang when not using -ffreestanding, and reduces the need for compiler flags to silence warnings for both clang and gcc. Most of these changes were automated using coccinelle with the following script: @@ @@ - void + int main(...) { ... - return; + return 0; ... } Approximately 40 files had to be edited by hand as coccinelle was unable to fix them. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-04-14 07:49:41 +09:00
..
boards	settings: file: drop CONFIG_SETTINGS_FILE_DIR	2022-12-14 14:11:03 +01:00
src	samples, tests, boards: Switch main return type from void to int	2023-04-14 07:49:41 +09:00
CMakeLists.txt
prj.conf
README.rst
sample.yaml	yamllint: fix all yamllint line-length errors	2023-01-04 01:16:45 +09:00

README.rst

.. _settings_subsys_sample:

Settings sample
###############

Overview
********

This is a simple application demonstrating use of the settings runtime
configuration module. In this application some configuration values are loaded
from persistent storage and exported to persistent storage using different
settings method. The example shows how to implement module handlers, how to
register them.

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

* A board with settings support, for instance: nrf52840dk_nrf52840
* Or qemu_x86 target

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

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

The sample can be build for several platforms, the following commands build the
application for the qemu_x86.

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/settings
   :host-os: unix
   :board: qemu_x86
   :goals: run
   :compact:

After running the image to the board the output on the console shows the
settings manipulation messages.

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

.. code-block:: console

   ***** Booting Zephyr OS build v2.1.0-rc1-123-g41091eb1d5e0 *****

   *** Settings usage example ***

   settings subsys initialization: OK.
   subtree <alpha> handler registered: OK
   subtree <alpha/beta> has static handler

   ##############
   # iteration 0
   ##############

   =================================================
   basic load and save using registered handlers

   load all key-value pairs using registered handlers
   loading all settings under <beta> handler is done
   loading all settings under <alpha> handler is done

   save <alpha/beta/voltage> key directly: OK.

   load <alpha/beta> key-value pairs using registered handlers
   <alpha/beta/voltage> = -3025
   loading all settings under <beta> handler is done

   save all key-value pairs using registered handlers
   export keys under <beta> handler
   export keys under <alpha> handler

   load all key-value pairs using registered handlers
   export keys under <beta> handler
   export keys under <alpha> handler

   =================================================
   loading subtree to destination provided by the caller

   direct load: <alpha/length/2>
   direct load: <alpha/length/1>
   direct load: <alpha/length>
     direct.length = 100
     direct.length_1 = 41
     direct.length_2 = 59

   =================================================
   Delete a key-value pair

   immediate load: OK.
     <alpha/length> value exist in the storage
   delete <alpha/length>: OK.
     Can't to load the <alpha/length> value as expected

   =================================================
   Service a key-value pair without dedicated handlers

   <gamma> = 0 (default)
   save <gamma> key directly: OK.
   ...