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Arduino Library for SPI Flash & FRAM memory chips

@Marzogh Marzogh released this
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SPIMemory Build Status DOI

Formerly known as SPIFlash.

GitHub release GitHub commits GitHub issues GitHub pull requests license

Please report any bugs in issues

Arduino library for Flash & FRAM Memory Chips (SPI based only)

Download the latest stable release from here. Please report any bugs in issues.

This Arduino library is for use with flash and FRAM memory chips that communicate using the SPI protocol. In its current form it supports identifying the flash/FRAM chip and its various features; automatic address allocation and management; writing and reading a number of different types of data, ranging from 8-bit to 32-bit (signed and unsigned) values, floats, Strings, arrays of bytes/chars and structs to and from various locations; sector, block and chip erase; and powering down for low power operation.

IDE Compatibility (actually tested with)

  • Arduino IDE v1.5.x
  • Arduino IDE v1.6.x
  • Arduino IDE v1.8.x

Platform compatibility

Micro controllers Dev boards tested with Notes
ATmega328P Arduino Uno, Arduino Micro,
Arduino Fio, Arduino Nano
ATmega32u4 Arduino Leonardo, Arduino Fio v3 -
ATmega2560 Arduino Mega -
ATSAMD21G18 (ARM Cortex M0+) Adafruit Feather M0,
Adafruit Feather M0 Express,
Adafruit ItsyBitsy M0 Express
AT91SAM3X8E (ARM Cortex M3) Arduino Due -
ATSAMD51J19 (ARM Cortex M4) Adafruit Metro M4 -
STM32F091RCT6 Nucleo-F091RC
ESP8266 Adafruit ESP8266 Feather,
Sparkfun ESP8266 Thing
ESP32 Adafruit ESP32 Feather,
Sparkfun ESP32 Thing
Onboard flash memory. Refer to footnote£ below.
Simblee Sparkfun Simblee -

£ ESP32 boards usually have an SPI Flash already attached to their default SS pin, so the user has to explicitly declare the ChipSelect pin being used with the constructor

Flash memory compatibility - Actually tested with

Manufacturer Flash IC Notes
Winbond W25Q16BV
Should work with the W25QXXXBV, W25QXXXFV &
W25QXXXJV families
Microchip SST25VF064C
Should work with the SST25 & SST26 families
Cypress/Spansion S25FL032P
Should work with the S25FL family
ON Semiconductor LE25U40CMC
AMIC A25L512A0
Micron M25P40
Adesto AT25SF041
Giga devices GD25Q16C (Used on the Adafruit ItsyBitsy M0 Express)
Should work with any flash memory that is compatible with the SFDP standard as defined in JESD216B

FRAM memory compatibility - Actually tested with

Manufacturer Flash IC Notes
Cypress/Spansion FM25W256 Should work with the FM25W family


Option 1

  • Open the Arduino IDE.
  • Go to Sketch > Include Library > Manage libraries.
  • Search for SPIMemory.
  • Install the latest version.

Option 2

  • Click on the 'Clone or download' button above the list of files on this page .
  • Select Download ZIP. A .zip file will download to your computer.
  • Unzip the archive and rename resulting folder to 'SPIMemory'
  • Move the folder to your libraries folder (~/sketches/libraries)

Change log


Enhancements & Optimizations:
  • Reduce SRAM footprint when running Diagnostics.ino. Thanks @rambo (PR #157)
  • Officially supports the ESP32 (tested on the ESP32 Feather)
  • Now supports FRAM memory chips via the SPIFram constructor
  • Changed Diagnostics output in _chipID() to match situation better.
  • Fixed _chipID() to run more efficiently.
Bugs squashed
  • Fixed a major bug causing issues with page boundaries in writeAnything and writeStr. Thanks for your help @jacky4566 (Issue #151)
  • Fixed a major bug with reading Strings (Issue #143)
  • @incorvia fixed a bug by initialising the SPIBusState to false
  • Fixes bug that causes ballooning of pagesize when SFDP is not read. This is because no default _pageSize value was set in this scenario. This has now been fixed.
  • Fixed a major bug in how SFDP data is used to calculate chip capacity. The previous version of the library returned a wrong value. This has now been fixed. Refer to comments in _getSFDPFlashParam(void) for further details.
New flash memory chips supported:

--> GD25Q16C from Giga devices (Used on the Adafruit ItsyBitsy M0 Express)

  • W25Q64JV from Winbond
  • SST26VF016B & SST26VF032B from Microchip. (Thanks @mix86)
New FRAM memory chips supported:
  • FM25W256 from Cypress