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How to Use NVS? #7442

Answered by Xylopyrographer
Bwanna asked this question in Q&A
Nov 7, 2022 · 4 comments · 3 replies
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Hi,
I'm trying to migrate away from using EEPROM to NVS and could use some help. Please consider this a newbie question, although I've been doing basic arduino for a a while.

I've found ArduinoNvs.h https://github.com/rpolitex/ArduinoNvs which does help.

The biggest challenge is finding code that shows how to save a 'double' datatype into NVS on an ESP32. I did see a recommendation to put datatypes like these inside a struct, which I've done. However, I can't decipher how to save a 'struct' in NVS.

Here's the struct I'd like to save in NVS
struct NTC_Coef { double Coef1; double Coef2; double Coef3; double Coef4; } NCT = { 0.0014619791146952, 0.0001.894175741, 0.0000000842224008, -0.000011716827022565 };

Thanks for the help!
Steve
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Replies: 4 comments 3 replies

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Howdy. It's in the docs:
Preferences API
Preferences Tutorial

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1 reply
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Thank you. Yes, I reviewed those docs and references, but were unable to translate that into Arduino code for use... that's why I highlighted this being a 'newbie' question. Would greatly appreciate if there was a very basic ARDUINO IDE example to reference. I just can't find any.

Thanks,
Answer selected by pedrominatel
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Did you take a look at the built-in Preferences examples? On Nov 7, 2022, at 12:49 PM, Bwanna ***@***.***> wrote:  Thank you. Yes, I reviewed those docs and references, but were unable to translate that into Arduino code for use... that's why I highlighted this being a 'newbie' question. Would greatly appreciate if there was a very basic ARDUINO IDE example to reference. I just can't find any. Thanks, — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.
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There’s also this: https://randomnerdtutorials.com/esp32-save-data-permanently-preferences/ On Nov 7, 2022, at 12:49 PM, Bwanna ***@***.***> wrote:  Thank you. Yes, I reviewed those docs and references, but were unable to translate that into Arduino code for use... that's why I highlighted this being a 'newbie' question. Would greatly appreciate if there was a very basic ARDUINO IDE example to reference. I just can't find any. Thanks, — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.
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Thank you! The built in preferences works great and that link provided great examples. Very much appreciated!
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There’s also this: https://randomnerdtutorials.com/esp32-save-data-permanently-preferences/

Exactly what was needed to resolve my // TODO: refactor from EEPROM to Preferences marker.
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😃👍 On Nov 7, 2022, at 5:16 PM, Bwanna ***@***.***> wrote:  Thank you! The built in preferences works great and that link provided great examples. Very much appreciated! — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.
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