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Using a Expressif dev-board and standard micropython.bin I was able to create a littlefs2 partition, mount it and write data into a file:

 # ESP8266 and ESP32
import os
os.umount('/')
os.VfsLfs2.mkfs(bdev)
os.mount(bdev, '/')

with open("myfile.txt", "a") as f:
  f.write("myData")

Once I have done this os.listdir() will show the myfile.txt file but I can't see a way to update my code on the ESP anymore.
I assume I need to get rid of the littlefs2 file system first but could not find an example for that.
The only way I found for changing my code was erasing all flash, load a new copy of micropython.bin and then flash my code modules again onto the chip - which is kind of a long process for every change in my code?
Any shorter/faster way to update my code files on the ESP?

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A - Revert to fat

if reformat with vfsFat is close enough to 'getting rid of' you can do the following:

import os
os.umount('/')
os.VfsFat.mkfs(bdev)
os.mount(bdev, '/')

import _boot

this should re-format the flash as fat, and re-init using the post_flash _boot module

B- Use an IDE to write code for/to the MCU

Assuming you also have a serialport ( or telnet) connection to your MCU another approach is to use an IDE ( VSCode + Pymakr works for sure, or likely Thonny works as well) to connect to your MCU. Pymakr will happily upload / download files from whatever filesystem you are using, as long as the files are not TOO HUGE

C - use a cmdline tool to download files from your MCU

there are a few tools for this

  • rshell advantage: can download complete folders, but may have same issues on windows
  • pyboard.py simple to use for single file up/download not for more complex operations. Do NOT use the stale version from PyPi
  • mpremote newest tool with more functionality , not supported against older firmware versions.
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