by QuickLogic

A 100% open source dev board for the EOS S3 low-power MCU with embedded FPGA

Crowdfunding Page History

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$6,891 raised

of $1 goal

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One totally open source QuickFeather board with a QuickLogic coaster and sticker, to boot.


USB-to-TTL Serial Cable

This Adafruit-branded adapter provides the simplest way to program, debug, or otherwise communicate serially with QuickFeather boards.


Five-pack of QuickLogic EOS S3 Chips

Five of the same system-on-chip used at the core of QuickFeather, in your choice of packaging. Note that the QFN package used on QuickFeather is being phased out in favor of the BGA package and is not recommended for new high-volume designs.


QuickFeather x2

Two totally open source QuickFeather boards with two QuickLogic coasters and stickers, to boot.


QuickFeather x5

Five totally open source QuickFeather boards with five QuickLogic coasters and stickers, to boot.


QuickFeather Early Bird

Quantity-limited, reduced price, totally open source QuickFeather board with a QuickLogic coaster and sticker, to boot.


Recent Updates

As Featured In

Electronic Engineering Journal

"Rather than lofting flaming arrows randomly into the rebel alliance surrounding the castle, QuickLogic cleverly decided to open the gates, let them all in, and feed them dinner."

Adafruit Industries

"Unlike other development kits based on proprietary hardware and software tools, QuickFeather is based on 100% open source hardware, compatible with the Adafruit Feather form factor, and is built around 100% open source software."

A low-power MCU + embedded FPGA in a Feather form factor with on-board sensors

QuickFeather is a development board for the QuickLogic EOS S3, a low-power System-on-Chip (SoC) that has both an Arm® Cortex®-M4F MCU and an embedded FPGA to enable the next generation of low-power embedded Machine Learning (ML).

The board ties into the Adafruit Feather ecosystem of over 60 pre-existing add-on boards, can be powered from and charge Li-Po batteries, and has an on-board microphone, accelerometer, and pressure sensor.

Open Source Everything

As part of our recently announced QuickLogic Open Reconfigurable Computing (QORC) initiative, we took special care to make everything about QuickFeather open source, from the hardware, to the software, to the tools. The FPGA industry is ripe for the sort of change open source has to offer - QuickFeather is our way of welcoming that change!

Open Hardware & Design Tools

Not only is the QuickFeather board itself open hardware, it was designed in the open source EDA platform, KiCad. Full KiCad project source files and final Gerber files can be found in our GitHub repository.

Open Embedded OS

It’s easy to use QuickFeather with Zephyr RTOS via our QuickLogic fork. Similarly, we’ve integrated FreeRTOS into our QORC SDK, which explicitly supports the QuickFeather board and includes sample code for getting started.

Open FPGA Tools

We worked directly with key members of the SymbiFlow community to make sure the embedded FPGA (eFPGA) in the EOS S3 SoC used on QuickFeather is fully supported by SymbiFlow’s excellent Verilog-to-bitstream tools. We also partnered with Antmicro to add support for the EOS S3 SoC in the open source Renode simulation and testing framework.

Open Machine Learning

QuickFeather’s combination of sensors, programmable logic, and low-power microcontroller make it a perfect hardware platform for the open source TensorFlow Lite machine learning tools.


For rapid development of custom embedded AI algorithms to run on QuickFeather or any other device based on the EOS S3 SoC, we recommend the SensiML Analytics Toolkit.

Features & Specfications

  • EOS S3 MCU + eFPGA SoC
    • Arm® Cortex®-M4F Microcontroller
      • up to 80 MHz operating frequency
      • up to 512 Kb SRAM
    • Embedded FPGA (eFPGA)
      • 2400 effective logic cells
      • 64 Kb RAM
  • Feather Form Factor
    • Breadboard-compatible 0.1" (2.54 mm) pitch headers - all headers are pre-soldered
    • 2.3" x 0.9" (58.4 mm x 22.9 mm) footprint
    • All 20 Feather-defined GPIO + 13 additional GPIO
  • Interfaces
    • SWD programming connector for use with USB-TTL converter
    • USB data signals are tied to eFPGA programmable logic
    • UART available via I/O headers
    • I²C
    • I²S
    • SPI
  • Storage: 16 Mbit SPI NOR flash - GigaDevice GD25Q16CEIGR
  • Sensors
  • User Interfaces
    • RGB LED
    • User pushbutton
    • Reset pushbutton
  • Power
    • USB micro Type-B connector (regulated to 3.3 V)
    • Li-Po battery
  • Software


The QuickFeather board features the QuickLogic EOS S3 System-on-Chip (SoC), which contains a low-power Arm® Cortex®-M4F processor and an embedded FPGA. The EOS S3 SoC is available in a variety of packages, including QFN and BGA. The QFN version is used on the QuickFeather board, however it is being phased out in favor of the BGA version.

Support & Documentation

Introduction to QuickFeather
Running "Hello World" on a QuickFeather Dev Kit
Programming a QuickFeather Dev Kit using TinyFPGA

Manufacturing Plan

An initial run of 250 units has already been produced. The units have been built and tested by trusted manufacturers and are ready to ship to the fulfillment center. Successive production batches are in the works, and our manufacturers are ready to produce at any necessary volume.

Fulfillment & Logistics

QuickFeather units will be shipped to backers from the Crowd Supply warehouse in the United States. Details on Crowd Supply fulfillment can be found in their guide page on ordering, paying, and shipping.

Risks & Challenges

As the hardware has already been through production, this project carries minimal risk. Of course, there is always a chance that the COVID-19 pandemic would slow shipping down and delay the delivery timeline. If such a thing does occur, backers will be notified via project updates.



We are a fabless semiconductor company that develops low-power, multi-core MCU, FPGAs, and embedded FPGA intellectual property (IP), voice and sensor processing.

Brian Faith

Mao Wang

Andrea Vedanayagam

See Also

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