embassy-rs / ekv Goto Github PK

Ekv works great but with 4096 page size it does allocate 8kB of RAM on the stack with can be pretty huge on a 96kb RAM chip.
My flash does have 4096 erase page size but the write can be done in 256 pages (with any offset), maybe splinting up page size into two settings could make it use a 2x256 buffer size?
Or maybe ekv could use free flash sectors as a buffer?

After the max chunk size feature, there is an issue where the PageWriter can still write chunks that are larger than max chunk size.

I attempted to fix this here https://github.com/embassy-rs/ekv/compare/write-max-chunk-size?expand=1 - but I don't think it is a good one, because it would waste a whole page per chunk.

Looking at FileWriter::write, it looks like it will just call write() in a loop, but it will not write the chunk header between the writes.

One solution could then be to commit each chunk in the FileWriter::write() loop, or build this into the PageWriter::write() itself. I'm not sure what the best solution is, or if calling commit() inside the write will somehow break some atomicity properties.

hello, could you add the ram/flash overhead of ekv, or the minimum required ram/flash? I want to use ekv, but my MCU's flash has only one sector(8kb) available. I'm not sure whether it's enough

@dotcypress has a good crate (dotcypress/kvs) with examples and a small number of adapters. Can you join forces 😄