MIDI LittleFS

[Nyegnav]

Apologies if I'm being a dumb dumb, but I can't seem to get the ESP8266Audio PlayMidifromLittleFS example to work;
Running on D1 Mini 4mb.
Monitor returns the following error;

Panic lfs.c:5121 lfs_file_read: Assertion 'lfs_mlist_isopen(lfs->mlist, (struct lfs_mlist*)file)' failed.

[joelwetzel]

My project had been working fine for a long time, but just recently I started getting this exact error. Instead of MIDI, I'm using AudioFileSourceLittleFS and AudioGeneratorWAV. Weirdly, it works fine if I play one wav file at a time, but the crash happens the moment I try to load a second wav file. (I'm putting them through an AudioOutputMixer.) This was all working until just recently.

[joelwetzel]

Well, I think I found the root of the problem, though I only have a workaround, not a true fix. From the release notes, it looks like the Espressif8266 framework version 3.0, which was released about a month ago, included some changes to how LittleFS works. I haven't found detailed documentation on the changes, but they appear to break LFS usage in this ESP8266Audio library. I was able to get my board running again by downgrading to an older version of the Espressif8266 framework. I'm using PlatformIO, so in my platform.ini file, I changed the platform line to be like:

platform = espressif8266@^2.6.3

After doing that, my project works again.

@earlephilhower

[earlephilhower]

Thanks for the report. This looks to be a core issue and PR is in review for the 3.0.2 bugfix release.

[Nyegnav]

Much thanks. New to all this, and have been slamming my head against a wall trying to see what I was doing wrong.