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Zephyr’s Device Tree work was presented at ELC 2017 in the context of the project’s early board-support development. The available record connects BayLibre’s Zephyr contributions and STM32L4 porting with a presentation on the topic, but does not establish the talk’s speakers, exact board, demonstrations, or slide contents.
What is documented about the ELC 2017 presentation?
The Zephyr Project’s Ecosystem Vendor Offerings page says BayLibre had contributed to the Zephyr community since 2016, ported Zephyr to STM32L4, and presented on the topic at ELC 2017. A 2018 technical article links a PDF titled “Zephyr Device Tree – ELC2017,” supporting the identification of a likely original presentation artifact. The PDF’s contents have not been verified here, so details about its examples, claims, and speakers cannot be stated as facts.
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That limitation matters: the talk title identifies its subject, but does not establish which board or demonstration it used. No exact development board is identified by the available sources.
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Device Tree is a structured description of hardware and configuration. Historical Zephyr documentation describes using it to represent board hardware and Zephyr-specific configuration, then processing that data during the build. The build extracted information into a generated header used while compiling the application. The documentation also describes reusing existing SoC-vendor Device Tree files and augmenting them with Zephyr-specific information.
#1 Best Overall
This is historical implementation context, not a current Zephyr how-to. In particular, it should not be confused with Linux’s conventional runtime Device Tree Blob handoff: the historical Zephyr account explicitly describes build-time processing for the application image. Names, file conventions, binding syntax, overlay behavior, and commands can change; consult the current Zephyr Devicetree documentation before applying the concept to a present-day project.
What does STM32L4 tell us—and what does it not?
BayLibre’s STM32L4 port is part of the historical context around the presentation, but it does not identify the talk’s exact hardware. A separate contemporaneous Linux.com report, published April 20, 2017, describes a BayLibre wearable project combining an ARM Cortex-A system with an STM32L4xx Cortex-M4 and needing UART, I2C master, and SPI slave drivers. That report is useful context for the period’s embedded work; it is not evidence that the Device Tree presentation used that wearable or those peripherals.
Rank #2
- Versatile Microcontroller: Incorporate the Nordic nRF52840 chip with FPU, operating up to 64 MHz, mounted multiple development ports
- Embracing Open Source: As an open source hardware, it also supports popular projects of Arduino / CircuitPython / Micropython / tinyGo / Zephyr / Meshtastic / Amazon Sidewalk / QMK / ZMK / ThingSpeak
- Wireless Capabilities: Implement Bluetooth 5.0, BLE functions with onboard antenna, also provide NFC connectivity
- Elaborate Power Design: Provide ultra-low power consumption as 5μA in deep sleep mode while supporting lithium battery charge management
- Thumb-Sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form-factor, suitable for wearable devices
Finding the likely presentation artifact
Half Coder’s March 23, 2018 article, “Zephyr Device Tree简介”, links a PDF titled “Zephyr Device Tree – ELC2017.” This makes the PDF a plausible route to the original slides, but the link alone does not verify what the deck says. Treat any specific quotation or detailed recap attributed to its presenters as unconfirmed unless checked against the slides themselves.
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Rank #4
- This Raspberry Pico IO shield is designed for the Raspberry Pi Pico development board. Note Raspberry Pico is Not Included!
- It also incorporates communications ports like 2 x I2C, 2 x UART, 2 x SPI, 3 x analog IO and 13 x digital IO as well as a 6.5-12V power interface.
- On board with four block building holes can assist to wire up multiple sensors or modules, which exceedingly increases more functions.
- DC input voltage: 6.5-12V ; Output voltage: DC3.3V V
- There are 26 GPIO pins, so you will be motivated to create what you want to make.
Rank #3
- ULTRA-LOW-POWER SoC: Powered by Nordic's nRF54LM20A with a 128 MHz Arm Cortex-M33 processor, 512 KB RAM, and 2 MB on-chip NVM.
- MULTI-PROTOCOL WIRELESS: Supports Bluetooth LE 6.0 with Channel Sounding, Mesh, Thread, Zigbee, Matter, NFC, and proprietary 2.4 GHz protocols.
- EXCEPTIONAL POWER EFFICIENCY: Deep sleep current as low as 4.76 µA and Ship Mode at just 0.33 µA for extended battery life.
- RICH I/O & CONNECTIVITY: Features 28 GPIOs, USB Type-C, 8 MB external flash, IPEX4 antenna connector, and onboard nPM1300 PMIC for battery charging.
- COMPACT & VERSATILE: Measuring just 21 x 17.8 mm, it supports nRF Connect SDK, PlatformIO, and Zephyr RTOS for wearables and IoT applications.
Sources and their scope
- Zephyr Project, “Ecosystem Vendor Offerings” (accessed October 4, 2026): BayLibre’s community contribution, STM32L4 port, and ELC 2017 presentation.
- Eric Brown, Linux.com, “Building a Wearable Device with Zephyr” (April 20, 2017): a separate BayLibre wearable project, not documentation of the Device Tree talk.
- Historical Zephyr documentation, “Device Tree in Zephyr”: an earlier design description, not necessarily the current workflow.
- Half Coder, “Zephyr Device Tree简介” (March 23, 2018): secondary article linking the PDF by title.
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