SPIFFS is a file system intended for SPI NOR flash devices on embedded targets.
It supports wear leveling, file system consistency checks and more.
Notes
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- Presently, spiffs does not support directories. It produces a flat structure. If SPIFFS is mounted under ``/spiffs`` creating a file with path ``/spiffs/tmp/myfile.txt`` will create a file called ``/tmp/myfile.txt`` in SPIFFS, instead of ``myfile.txt`` under directory ``/spiffs/tmp``.
- It is not a realtime stack. One write operation might last much longer than another.
- Presently, it does not detect or handle bad blocks.
Tools
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Host-Side tools for creating SPIFS partition images exist and one such tool is `mkspiffs <https://github.com/igrr/mkspiffs>`_.
You can use it to create image from a given folder and then flash that image with ``esptool.py``
To do that you need to obtain some parameters:
- Block Size: 4096 (standard for SPI Flash)
- Page Size: 256 (standard for SPI Flash)
- Image Size: Size of the partition in bytes (can be obtained from partition table)
- Partition Offset: Starting address of the partition (can be obtained from partition table)
An example for using SPIFFS is provided in :example:`storage/spiffs` directory. This example initializes and mounts SPIFFS partition, and writes and reads data from it using POSIX and C library APIs. See README.md file in the example directory for more information.
