zephyr

History

Andrzej Głąbek 20202902f2 dts_fixups: Use DT_ prefix in all defined labels not related to Kconfig These changes were obtained by running a script created by Ulf Magnusson <Ulf.Magnusson@nordicsemi.no> for the following specification: 1. Read the contents of all dts_fixup.h files in Zephyr 2. Check the left-hand side of the #define macros (i.e. the X in #define X Y) 3. Check if that name is also the name of a Kconfig option 3.a If it is, then do nothing 3.b If it is not, then replace CONFIG_ with DT_ or add DT_ if it has neither of these two prefixes 4. Replace the use of the changed #define in the code itself (.c, .h, .ld) Additionally, some tweaks had to be added to this script to catch some of the macros used in the code in a parameterized form, e.g.: - CONFIG_GPIO_STM32_GPIO##__SUFFIX##_BASE_ADDRESS - CONFIG_UART_##idx##_TX_PIN - I2C_SBCON_##_num##_BASE_ADDR and to prevent adding DT_ prefix to the following symbols: - FLASH_START - FLASH_SIZE - SRAM_START - SRAM_SIZE - _ROM_ADDR - _ROM_SIZE - _RAM_ADDR - _RAM_SIZE which are surprisingly also defined in some dts_fixup.h files. Finally, some manual corrections had to be done as well: - name##_IRQ -> DT_##name##_IRQ in uart_stm32.c Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>		2018-11-13 10:44:42 -06:00
..
src	dts_fixups: Use DT_ prefix in all defined labels not related to Kconfig	2018-11-13 10:44:42 -06:00
CMakeLists.txt	samples, tests: Use semi-accurate project names	2018-10-27 21:31:25 -04:00
prj.conf	subsys: nvs: move to new logger	2018-10-08 17:49:12 -04:00
README.rst
sample.yaml	tests/samples: cleanup tags	2018-10-16 09:17:51 -04:00

README.rst

.. _nvs-sample:

NVS: Non-Volatile Storage
#########################

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 :file:`samples/subsys/nvs` in the Zephyr tree.

The sample can be build for several platforms, the following commands build the
application for the nrf51_pca10028 board.

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/nvs
   :board: nrf51_pca10028
   :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_init: maximum storage length 256 byte
   [fs/nvs] [INF] nvs_init: write-align: 1, write-addr: c
   [fs/nvs] [INF] nvs_init: 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_init: maximum storage length 256 byte
   [fs/nvs] [INF] nvs_init: write-align: 1, write-addr: c7
   [fs/nvs] [INF] nvs_init: 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
   ...