{"id":79,"date":"2026-02-26T12:37:51","date_gmt":"2026-02-26T11:37:51","guid":{"rendered":"https:\/\/elrebo.de\/?p=79"},"modified":"2026-02-26T12:39:46","modified_gmt":"2026-02-26T11:39:46","slug":"generic_nvsflash","status":"publish","type":"post","link":"https:\/\/www.elrebo.de\/index.php\/2026\/02\/26\/generic_nvsflash\/","title":{"rendered":"generic_nvsflash"},"content":{"rendered":"\n

An ESP-IDF component for Physical Computing<\/a><\/p>\n\n\n\n

Purpose<\/h2>\n\n\n\n

Read and write data in non-volatile flash storage on ESP32 systems.<\/p>\n\n\n\n

This data is still available after the device is restarted.<\/p>\n\n\n\n

How it is done<\/h2>\n\n\n\n

You need to include generic_nvsflash.hpp<\/code>.<\/p>\n\n\n\n

Then you define an instance of class GenericNvsFlash<\/code>.<\/p>\n\n\n\n

In the constructor of the class you state the namespace to use and whether you want to read and write or only to read the values from NVS flash.<\/p>\n\n\n\n

Now you can use the setter and getter methods of the class to set or get the values of stored keys. <\/p>\n\n\n\n

With method EraseKey<\/code> you can delete keys from the namespace.<\/p>\n\n\n\n

Changes to key values are uncommitted until the instance ist deleted. In the destructor the changes are committed to the namespace.<\/p>\n\n\n\n

Where to find it<\/h2>\n\n\n\n

generic_nvsflash<\/code>\u00a0is published on the ESP Registry at\u00a0https:\/\/components.espressif.com\/components\/elrebo-de\/generic_nvsflash<\/a>.<\/p>\n\n\n\n

The source code can be found at https:\/\/github.com\/elrebo-de\/generic_nvsflash<\/a>.<\/p>\n\n\n\n

How to use it<\/h2>\n\n\n\n

As an ESP-IDF component generic_nvsflash<\/code> must be included into idf_component.yml as a dependency. As usual this can be done by executing this command:<\/p>\n\n\n\n

idf.py add-dependency \"elrebo-de\/generic_nvsflash^1.0.11\"<\/code><\/p>\n\n\n\n

In CMakeLists.txt \"elrebo-de__generic_nvsflash\"<\/code> has to be added as a requirement.<\/p>\n\n\n\n

Now you can include generic_nvsflash.hpp<\/code> and use the GenericNvsFlash class in your program.<\/p>\n\n\n\n

With this code snippet the value of a parameter is stored in an NVS namespace:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

An ESP-IDF component for Physical Computing Purpose Read and write data in non-volatile flash storage on ESP32 systems. This data is still available after the device is restarted. How it is done You need to include generic_nvsflash.hpp. Then you define an instance of class GenericNvsFlash. In the constructor of the class you state the namespace to use and […]<\/p>\n","protected":false},"author":2,"featured_media":126,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-79","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oss"],"_links":{"self":[{"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":4,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":128,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/posts\/79\/revisions\/128"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/media\/126"}],"wp:attachment":[{"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/media?parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/categories?post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.elrebo.de\/index.php\/wp-json\/wp\/v2\/tags?post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}