LittleFS_esp32 for Tasmota (Arduino IDF 3.3.x)

***Notice: The Library is been integrated to Arduino esp32 core idf-release/v4.2 branch and later versions

LittleFS library for arduino-esp32

• A LittleFS wrapper for Arduino ESP32 of littlefs-project
• Based on ESP-IDF port of joltwallet/esp_littlefs , thank you Brian!
• As a reference, see LillteFS library for ESP8266 core
• PR and merge at esp32 core development
• PR at esp-idf development
• The functionality is similar to SPIFFS

Usage

• Use LITTLEFS with identical methods as SPIFFS plus mkdir() and rmdir()
• A quick startup based on your existing code you can re-define SPIFFS

#define USE_LittleFS

#include <FS.h>
#ifdef USE_LittleFS
  #define SPIFFS LittleFS
  #include <LittleFS.h>
#else
  #include <SPIFFS.h>
#endif

• Note, this may not work if your sketch uses other libraries that use SPIFFS themselves.
• See also esp_partition.h . LITTLEFS re-uses same type and subtype as SPIFFS

Differences with SPIFFS

• LittleFS has folders, you need to iterate files in folders unless you set #define CONFIG_LITTLEFS_SPIFFS_COMPAT 1
• At root a "/folder" = "folder"
• Requires a label for mount point, NULL will not work. Recommended is to use default LITTLEFS.begin()
• maxOpenFiles parameter is unused, kept for compatibility
• LITTLEFS.mkdir(path) and LITTLEFS.rmdir(path) are available
• file.seek() behaves like on FFat see more details
• file.write() and file.print() when partition space is ending may return different than really written bytes (on other FS is also inconsistent).
• Speed comparison based on LittleFS_test.ino sketch (for a file 1048576 bytes):

Filesystem	Read time [ms]	Write time [ms]
FAT	276	14493
LITTLEFS	446*	16387
SPIFFS	767	65622

*The read speed improved by changing #define CONFIG_LITTLEFS_CACHE_SIZE from 128 to 512

Arduino ESP32 LittleFS filesystem upload tool

• Use (replace if exists) arduino-esp32fs-plugin with this variant, which supports SPIFFS, LittleFS and FatFS
• Requires mklittlefs executable which is available in releases section here or download the zipped binary here or from esp-quick-toolchain releases here
• Copy it to /tools folder of esp32 platform where espota and esptool (.py or.exe) tools are located
• Restart Arduino IDE.

PlatformIO

• See LITTLEFS_PlatformIO example here ( based on notes below from BlueAndi )

• Add to platformio.ini: extra_scripts = replace_fs.py

• Add replace_fs.py to project root directory (where platformio.ini is located):

Import("env")
print("Replace MKSPIFFSTOOL with mklittlefs.exe")
env.Replace (MKSPIFFSTOOL = "mklittlefs.exe")

• Add mklittlefs.exe to project root directory as well.

Credits and license

• This work is based on littlefs-project , ESP-IDF port of joltwallet/esp_littlefs , Espressif Arduino core for the ESP32, the ESP-IDF - SPIFFS Library
• Licensed under GPL v2 (text)