Open Source Summit Europe 2025: Full Schedule

25-27, August 2025
Amsterdam, Netherlands
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Note: The schedule is subject to change.

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IMPORTANT NOTE: Timing of sessions and room locations are subject to change.

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09:00 CEST

Optimizing Zephyr for Peak Performance - Jacob Beningo, Beningo Embedded Group

Wednesday August 27, 2025 09:00 - 09:40 CEST

D203

The Zephyr Project is a leading open-source RTOS for resource-constrained, real-time applications. Its modularity, vendor neutrality, and rich ecosystem make it a powerful choice for embedded developers. However, achieving peak performance requires a deep understanding of Zephyr’s internals and optimization strategies.

This session explores techniques to optimize Zephyr applications for efficiency, low latency, and real-time predictability. Attendees will learn how scheduling, memory management, and interrupt handling impact performance and how to fine-tune these elements for specific workloads. We’ll cover configuring Zephyr for high-performance execution, reducing runtime overhead, and debugging bottlenecks.

Key topics include:

• Zephyr’s scheduling model and task prioritization

• Optimizing interrupts and reducing latency

• Fine-tuning memory management and resource allocation

• Profiling and debugging performance issues

• Advanced optimizations for power efficiency and I/O

Whether you’re developing for IoT, industrial automation, or real-time control, this session will equip you with practical strategies to maximize Zephyr’s performance and reliability.

Speakers

Jacob Beningo

CEO / Founder, Beningo Embedded Group

Jacob Beningo helps embedded teams modernize software architecture, streamline development, and adopt best practices for high-quality, real-time systems. As founder of Beningo Embedded Group, he provides expert training and guided learning to improve code quality, accelerate development... Read More →

Wednesday August 27, 2025 09:00 - 09:40 CEST
D203

Zephyr Developer Summit

Audience Experience Level Any

09:50 CEST

Zephyr RTOS: Under 1KB of RAM - Parthiban N & Karthikeyan Krishnasamy, Linumiz

Wednesday August 27, 2025 09:50 - 10:30 CEST

D203

On a well-supported hardware platform/SoC, the typical RAM required to run simple applications like hello_world or blinky is around 1.5 KB with the default configurations. SoCs with RAM under 8 KB are common in single-purpose application use cases. With the recent announcement of the world’s smallest microcontroller from TI [1], featuring just 1 KB of SRAM, this coincidentally overlapped with our initial efforts to get the MSPM0 family series into the Zephyr RTOS upstream.

As of today, the smallest RAM where Zephyr can run is 2 KB, supporting UART and GPIO, which utilizes over 90% of the RAM. We often encounter the "FLASH/RAM overflowed by N bytes" error when attempting to get Zephyr working under 1 KB of RAM.

In this talk, we will share the challenges faced while running a useful use case application under 1 KB using Zephyr. Achieving this was made possible thanks to the small footprint of the kernel (i.e., 128 bytes). We will discuss what goes beyond GCC’s -Os and -Oz flags and how we managed to get true multitasking with I2C, SPI, and ADCs running, all while keeping current consumption under 2 µA.

[1]: https://bit.ly/42uSCC6

Speakers

Karthikeyan Krishnasamy

Embedded Software Engineer, Linumiz

Karthikeyan, who has experience in embedded software development over 3 years, works at Linumiz and is principally responsible for board support and driver development for custom boards using Linux and Zephyr RTOS. He is contributor of Zephyr RTOS.

Wednesday August 27, 2025 09:50 - 10:30 CEST
D203

Zephyr Developer Summit

Audience Experience Level Intermediate

11:00 CEST

From Code To Current: Reducing Energy Consumption in Zephyr - Fabian Pflug, On behalf of myself

Wednesday August 27, 2025 11:00 - 11:40 CEST

D203

When designing battery-powered sensor devices, optimizing the power consumption of all components is crucial. While many sensors offer low-power modes, the generic sensor interface in Zephyr may not always utilize these modes efficiently.

In this talk, I will provide an in-depth look at how Zephyr’s Power Management Subsystem works, how to integrate it into your device drivers, and how it can be used to further reduce power consumption.

Using examples such as a battery level sensor and I2C sensors, I will demonstrate various strategies to manage and minimize a sensor's energy usage. There are multiple approaches to integrating power management within the Zephyr operating system, and I will discuss how sensor characteristics influence which method results in longer battery life. Achieving optimal energy efficiency requires careful consideration of several parameters.

Additionally I will compare different MCU's and their influence on Power consumption and how Zepyhr enables a quick and easy way to switch and compare results on different platforms.

Speakers

Fabian Pflug

Embedded Software Developer, On behalf of myself

Starting with optimizing power consumption in high performance systems, and training AI models for medical data Fabian Pflug has long since shifted to working with embedded systems. As a Zephyr contributor and embedded software developer for years he knows some of the caveats that... Read More →

Wednesday August 27, 2025 11:00 - 11:40 CEST
D203

Zephyr Developer Summit

Audience Experience Level Intermediate

11:55 CEST

Zbus - New Features and Roadmap - Rodrigo Peixoto, Edge-UFAL/Citrinio

Wednesday August 27, 2025 11:55 - 12:35 CEST

D203

This session presents the new features of ZBus since the last event. It also discusses the bus roadmap.

Speakers

Rodrigo Peixoto

Embedded Software Engineer, Edge-UFAL/Citrinio

Embedded Systems enthusiast and passionate surfer. Rodrigo has been the R&D Lead Embedded Systems Engineer at Edge Innovation Center since 2015. Professor at the Federal University of Alagoas since 2011. Co-founder at Citrinio. Zephyr bus maintainer (ZBus subsystem).

Wednesday August 27, 2025 11:55 - 12:35 CEST
D203

Zephyr Developer Summit

Audience Experience Level Beginner

14:10 CEST

The Native Simulator and Zephyr - Alberto Escolar, Nordic Semiconductor

Wednesday August 27, 2025 14:10 - 14:50 CEST

D203

The native simulator is an evolution of Zephyr's native_posix and the POSIX architecture.

It is a basic part of Zephyr's test and debug infrastructure which allows you to build, run and debug your code directly in your host, instrumenting it however you want.

In this talk we will cover:

* An introduction to the native simulator in Zephyr.

* Why does it exist: What one can do with it, and how we use it in Zephyr.

* The native simulator based targets we have in Zephyr.

* How does it work: A brief description of its architecture and what it supports.

* What the average user needs to know ("I just want to run my tests on it, what are the gotchas").

* What a power user needs to know ("I want to write my own driver to interact with a host peripheral, how?").

Speakers

Alberto Escolar

Principal Engineer, Nordic Semiconductor

Zephyr RTOS Maintainer since 2017, and author of the native simulator, POSIX architecture, and Babblesim.

Wednesday August 27, 2025 14:10 - 14:50 CEST
D203

Zephyr Developer Summit

Audience Experience Level Any

15:05 CEST

A Slice of Zephyr Pi! - Chris Boross, Raspberry Pi

Wednesday August 27, 2025 15:05 - 15:45 CEST

D203

Since the first Raspberry Pi boards were released in 2012, they have been used by hobbyists, educators and professionals all over the world, and pushed to their limits in space, on deserts and in the deep sea. With the introduction of the RP2040 and RP2350 microcontrollers over the past few years, Raspberry Pi entered the world of deeply embedded systems with some fresh ideas. The Zephyr community quickly set to work supporting this new hardware – and it hasn’t stopped since!

This talk will cover the current state of Zephyr support for Raspberry Pi microcontrollers, how we got here and how developers can contribute to further improvements. This includes working on building blocks of the open source embedded ecosystem such as OpenOCD. We will look at support for Rust and RISC-V, as well as the Programmable I/O (PIO) which is unique to Raspberry Pi. Finally, we will show a survey of open source applications and hardware built with the combination of Zephyr and Raspberry Pi, with some tips for using them in your own projects.

Speakers

Chris Boross

Raspberry Pi Silicon and Compute Hardware, Raspberry Pi

Chris Boross supports customers around the world in their use of Raspberry Pi Silicon and Compute Hardware.

Wednesday August 27, 2025 15:05 - 15:45 CEST
D203

Zephyr Developer Summit

Audience Experience Level Intermediate

16:20 CEST

Zephyr & Linux Devicetree, Similarities and Differences – Practical Guide To Boards, Shields and Con - Stephan Linz, Navimatix GmbH & Tobias Kästner, inovex GmbH

Wednesday August 27, 2025 16:20 - 17:00 CEST

D203

With the introduction of Devicetree translation into the Zephyr build process, not only was a proven hardware description language integrated as the state of the art, but also the door to a new art of metaprogramming was opened for the first time for deep embedded programming.

After a short introduction, this talk will take a practical look at the terms commonly used in Zephyr, such as boards, shields and connectors, explain their differences to familiar build and runtime processes from the Linux world and show the limits of the abstractions that can currently be realized with Zephyr. Simple examples for daily work will be presented, but also terms such as Nexus or Shield Stack will be defined in more detail.

Speakers

Tobias Kästner

Solution Architect Medical IoT, inovex GmbH

A physicist by training, Tobias Kaestner has always been fascinated by the intersection of the physical with the digital world. His professional career started as a SW team lead in a medical device start-up and since then he has served a couple of roles for 15+ years in this industry... Read More →

Stephan Linz

FOSS Technology Expert, Zephyr & Linux Devicetree, Similarities and Differences – Practical Guide To Boards, Shields and Con - Stephan Linz,

With 25 years of hardware-related software development using only freely available technologies for scientific instrumentation, industry, medical devices, automotive, I have seen many frameworks and tools for Linux and deeply embedded systems. Since 2016, this has also included Zephyr... Read More →

Wednesday August 27, 2025 16:20 - 17:00 CEST
D203

Zephyr Developer Summit

Audience Experience Level Beginner