Spiffs

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spiffs is an open-source wear-leveled SPI flash file system for embedded devices, designed for small targets with sparse RAM. It provides a POSIX-like API for managing files on NOR flash memory.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is spiffs?

SPIFFS (SPI Flash File System) is an open-source file system specifically engineered for SPI NOR flash devices in embedded systems. It prioritizes low RAM usage, operating with statically sized RAM buffers independent of the number of files. SPIFFS offers a POSIX-like API for file operations, including open, close, read, write, seek, and stat. It supports wear leveling to extend the lifespan of flash memory and includes built-in file system consistency checks. While highly configurable and capable of running multiple configurations on the same target, it currently does not support directories, creating a flat file structure. It is intended for small memory devices, typically up to 128MB, due to its design goal of minimal RAM consumption.

Best used for

Ideal for developers who need to implement a robust file system on embedded devices with limited RAM and NOR flash memory. Especially valuable for IoT applications and microcontrollers where wear leveling and efficient resource management are critical for device longevity and performance.

Common actions

manage flash memory

implement file system

develop embedded systems

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Capabilities

Key features

Wear-leveled flash file system
Low RAM usage
POSIX-like API
Static wear leveling
Configurable
Consistency checks

Target Audience

developer

Integrations

Not yet documented

Pricing & Plans

Open Source

Free

FAQs

What kind of flash memory does SPIFFS support?

SPIFFS is primarily intended for SPI NOR flash devices but can theoretically run on any NOR flash, including embedded flash of a microprocessor. Its design is optimized for the characteristics of NOR flash memory.

Does SPIFFS support directories?

No, SPIFFS currently does not support directories. It produces a flat file structure, meaning a file created with a path like 'tmp/myfile.txt' will be stored as a single file named 'tmp/myfile.txt'.

What are the typical memory size limitations for SPIFFS?

SPIFFS is designed for small memory devices, with normal sizes for SPI flashes. Going beyond approximately 128MB is generally not recommended due to its design goal of using minimal RAM, which impacts scalability for larger devices.

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