How to save settings in custom driver?

[Phil1pp]

I am trying to write a custom driver that requires to save some configuration data and restore it after reboot.
Is there already any function/library that can be used for this purpose?

[openshwprojects]

It's nice to hear that people are creating custom drivers. For saving data in flash, we don't have any universal API, but you can use retain channels (saved as short), as there are MAX_RETAIN_CHANNELS (12) of them and it's very unlikely that users will use all 12 of them... usually up to 4 are used.

Alternatively, you could try LFS

[Phil1pp]

Thanks for your answer, however 8 shorts won't be enough.
I am trying to implement a KNX interface which will need a storage of up to 1024 bytes.
Can I read and write to the Flash somehow?
Is LFS implemented an how to use it?

[openshwprojects]

Yes we have LFS, check commands for lfs_write etc and check their implementation. You can also check rest_interface.c file. You can read, write, append and remove files. I can give more details later if it's needed

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On Wed, 9 Apr 2025, 09:17 Phil1pp, ***@***.***> wrote: Thanks for your answer, however 8 shorts won't be enough. I am trying to implement a KNX interface which will need a storage of up to 1024 bytes. Can I read and write to the Flash somehow? Is LFS implemented an how to use it? — Reply to this email directly, view it on GitHub <#1598 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AUMGZ64DWHTP6S6MVPCJ63D2YTCQDAVCNFSM6AAAAAB2WUJOLOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOOBYGU4DKOJWGQ> . You are receiving this because you commented.Message ID: ***@***.***> *Phil1pp* left a comment (openshwprojects/OpenBK7231T_App#1598) <#1598 (comment)> Thanks for your answer, however 8 shorts won't be enough. I am trying to implement a KNX interface which will need a storage of up to 1024 bytes. Can I read and write to the Flash somehow? Is LFS implemented an how to use it? — Reply to this email directly, view it on GitHub <#1598 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AUMGZ64DWHTP6S6MVPCJ63D2YTCQDAVCNFSM6AAAAAB2WUJOLOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOOBYGU4DKOJWGQ> . You are receiving this because you commented.Message ID: ***@***.***>