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zephyr/subsys/fs/nvs/Kconfig

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subsys: fs: Add Non Volatile Storage (NVS) for zephyr Zephyr supports fatfs, nffs and fcb as storage layer. fatfs and nffs are less suited for application in memory restricted IC's. fcb has a smaller footprint but has a complex api. The proposed module is a module with a even smaller footprint compared to fcb and a simple interface for reading and writing entries. The module provides wear levelling of flash. This allows the module to be used not only to store configuration settings but to store device state (e.g. state of a light switch over reboots) of a zephyr device. Fixes buffer overflow by introducing maximum read length in nvs_read() and nvs_read_hist(). Fixes nvs_write() not to reflash the same data. Allows the user to do call nvs_write() for all defined entries without worries about flash wear. Fixes garbage collection error where wrong data could be copied. Add nvs_delete() to allow deleting a stored entry. A deleted entry will not be copied to a new flash sector Include flash wear information in the README.md documentation 0/25 Update module after reviewers remarks, added documentation to nvs.h, removed README.md by nvs.rst in doc/subsystems folder 04/26 Update module after reviewers remarks, updated nvs.rst, added more documentation to samples/subsys/nvs/src/main.c, updated doxygen info in nvs.h (hope this time it works). 04/26 Update subsystems.rst to include nvs.restart 04/27 Updated nvs.c and nvs.h to avoid a possible flash deletion loop when the file system is full. 04/29 Updated nvs_write to detect and ignore deletes of non-existing items 05/06 Update NVS module to return standard error codes, removed low level API, added configuration options. NVS now uses the board dts to determine the flash storage location (FLASH_AREA_STORAGE_OFFSET). 05/06 Update nvs.rst. Updated intendation and added intermediate variables in nvs.c to make the code easier to read. 05/06 Update nvs.rst. 05/07 Update nvs.rst 05/08 Changed the API to a more standard file system API. 05/08 Removed cnt_max from nvs_read() as it is not used. 05/08 Removed #ifdef(CONFIG_NVS_LOG) from nvs_priv.h, now the module can be build with debugging off. 05/09 Removed configuration options for SECTOR_SIZE, SECTOR_COUNT and MAX_ELEM_SIZE. It is now easy to support multiple NVS filesystems on one or multiple devices. Changed logging to support newlib systems. Thanks to Olivier Martin for reporting and proposed changes. Signed-off-by: Laczen JMS <laczenjms@gmail.com>
2018-03-02 05:09:17 +08:00
# Kconfig - Non-volatile Storage NVS
#
# Copyright (c) 2018 Laczen
#
# SPDX-License-Identifier: Apache-2.0
#
config NVS
bool
prompt "Non-volatile Storage"
default n
select FS_FLASH_STORAGE_PARTITION
help
Enable support of Non-volatile Storage.
if NVS
config NVS_PROTECT_FLASH
bool
prompt "Non-volatile Storage extra flash protection"
default n
help
Enable extra protection against unnecessary writes to flash. This
enables a extra read check, if data is not changed no write is
performed. If this check is already performed (e.g. no writes unless
data is changed) you can disable this operation.
config NVS_LOG
bool "Non-volatile Storage logging"
select SYS_LOG
default n
help
Enable logs and checks for Non-volatile Storage.
if NVS_LOG
config NVS_LOG_LEVEL
int
prompt "Non-volatile Storage Logging level"
depends on SYS_LOG
default 1
range 0 4
help
Sets log level for Non-volatile Storage.
Levels are:
0 OFF, do not write
1 ERROR, only write SYS_LOG_ERR
2 WARNING, write SYS_LOG_WRN in addition to previous level
3 INFO, write SYS_LOG_INF in addition to previous levels
4 DEBUG, write SYS_LOG_DBG in addition to previous levels
endif # NVS_LOG
endif # NVS