54 lines
2 KiB
ReStructuredText
54 lines
2 KiB
ReStructuredText
SPIFFS Filesystem
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=================
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Overview
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--------
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SPIFFS is a file system intended for SPI NOR flash devices on embedded targets.
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It supports wear leveling, file system consistency checks and more.
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Notes
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-----
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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``.
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- It is not a realtime stack. One write operation might last much longer than another.
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- Presently, it does not detect or handle bad blocks.
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Tools
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-----
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Host-Side tools for creating SPIFS partition images exist and one such tool is `mkspiffs <https://github.com/igrr/mkspiffs>`_.
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You can use it to create image from a given folder and then flash that image with ``esptool.py``
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To do that you need to obtain some parameters:
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- Block Size: 4096 (standard for SPI Flash)
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- Page Size: 256 (standard for SPI Flash)
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- Image Size: Size of the partition in bytes (can be obtained from partition table)
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- Partition Offset: Starting address of the partition (can be obtained from partition table)
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To pack a folder into 1 Megabyte image::
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mkspiffs -c [src_folder] -b 4096 -p 256 -s 0x100000 spiffs.bin
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To flash the image to ESP32 at offset 0x110000::
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python esptool.py --chip esp32 --port [port] --baud [baud] write_flash -z 0x110000 spiffs.bin
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See also
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--------
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- :doc:`Partition Table documentation <../../api-guides/partition-tables>`
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Application Example
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-------------------
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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.
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High level API Reference
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------------------------
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* :component_file:`spiffs/include/esp_spiffs.h`
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.. include:: /_build/inc/esp_spiffs.inc
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