53 lines
2 KiB
ReStructuredText
53 lines
2 KiB
ReStructuredText
SPIFFS Filesystem
|
|
=================
|
|
|
|
Overview
|
|
--------
|
|
|
|
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
|
|
-----
|
|
|
|
- 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
|
|
-----
|
|
|
|
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)
|
|
|
|
To pack a folder into 1 Megabyte image::
|
|
|
|
mkspiffs -c [src_folder] -b 4096 -p 256 -s 0x100000 spiffs.bin
|
|
|
|
To flash the image to ESP32 at offset 0x110000::
|
|
|
|
python esptool.py --chip esp32 --port [port] --baud [baud] write_flash -z 0x110000 spiffs.bin
|
|
|
|
See also
|
|
--------
|
|
|
|
- :doc:`Partition Table documentation <../../api-guides/partition-tables>`
|
|
|
|
Application Example
|
|
-------------------
|
|
|
|
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.
|
|
|
|
High level API Reference
|
|
------------------------
|
|
|
|
* :component_file:`spiffs/include/esp_spiffs.h`
|
|
|
|
.. include:: /_build/inc/esp_spiffs.inc
|