EEPROM.length() issue?

[michaelfaith84]

Background (feel free to skip)
I have an Arduino project that i've been working on where I need to persist some config so I've been using the EEPROM. The Arduino form factor is important because I have a pile of shields relevant to the project. Recently, I discovered the Pi 20240 Metro and decided to give it a whirl in the hopes of increasing board options for the project.

Issue(?)
The EEPROM.length() method should, as I understand it, return the number of cells (bytes) available without regard to whether or not they are written to. The method as implemented here, seems to return the quantity used--which defaults, naturally, to zero. Shouldn't it be 4096? If littlefs would sort me out, I'm happy to check it out but I believe this issue is still a breaking issue with regards to compatibility with other Arduino libraries/projects.

[earlephilhower]

Yeah, that seems like a difference from the "standard." I copied the code and behavior from ESP8266 core I was working on at the time and EEPROM.length() never came up as in issue there or here. If you'd like to do a PR to make it match the Arduino specs, that would be great.

That said, LittleFS is much more useful and suited for the RP2040. EEPROM on the Pico is just emulated using the (hopefully) NOR flash and not wear-leveled. LittleFS lets you store multiple configuration options in machine and human readable form, easily.

[michaelfaith84]

First of all, thanks for the amazingly fast response!

I'll definitely check out littlefs and open a PR.

Thanks for the awesome work on this project!