PlatformIO Open Source April Updates
Support for the latest ESP-IDF and Zephyr RTOS, Updates for Espressif32, ST STM32, Microchip AVR/megaAVR and Teensy dev-platforms
Welcome to the April 2026 updates of PlatformIO Open Source professional collaborative platform for embedded development.
This month we received a lot of helpful feedback from our community, which let us identify the most important parts of our OSS ecosystem that required our attention, so there are plenty of updates pushed in this month that we hope you will like.
During April, we added support for the latest ESP-IDF v6.0 and Zephyr RTOS 4.4, published updates for several popular development platforms, fixed a lot of issues. Some of the key highlights include:
- ESP-IDF v6.0
- Zephyr RTOS v4.4
- Espressif32 dev-platform v7.0
- ST STM32 dev-platform v19.6
- Microchip AVR dev-platform v5.2
- Microchip megaAVR dev-platform v1.9
- Teensy dev-platform v5.1
ESP-IDF v6.0
We’re happy to announce updated support for the latest release of ESP-IDF v6.0 - the official development framework for the ESP32, ESP32-S and ESP32-C Series SoCs. It provides a self-sufficient SDK for any generic application development on these platforms, using programming languages such as C and C++. ESP-IDF currently powers millions of devices in the field, and enables building a variety of network-connected products, ranging from simple light bulbs and toys to big appliances and industrial devices.
Major enhancements in v6.0:
- ESP-IDF upgrades to MbedTLS v4.x and adopts the new PSA Crypto API
- Upgraded default C standard to gnu23
- Upgraded default C++ standard to gnu++26
More information on project configuration for ESP-IDF can be found here.
Related resources for ESP-IDF:
Zephyr RTOS v4.4
We’re happy to announce updated support for the latest release v4.4.0 of Zephyr Project - a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource-constrained devices, and built with safety and security in mind.
Major enhancements in v4.4:
- A new biometrics API for integrating biometric sensors such as fingerprint scanners or facial recognition systems
- A new context switch implementation for ARM Cortex-M
- A new successfully qualified Bluetooth Low Energy (LE) Host stack, aligned with Bluetooth Core Specification 6.2
Related resources for Zephyr framework:
- Release notes for v4.4.0
- Documentation for Zephyr framework
- Supported development platforms
- Supported boards
Espressif32 dev-platform v7.0
The new release of the Espressif 32 dev-platform brings support for the latest ESP-IDF, updated toolchain packages and several minor improvements:
- Added support for ESP-IDF v6.0 (release notes)
- Updated IDF toolchains to v15.2.0+20251107
- Fixed matching of IDF components directory when there’s a symlink in the path to .platformio (#1599)
- Minor fixes and improvements
Related resources for the Espressif32 dev-platform:
ST STM32 dev-platform v19.6
The new release of the ST STM32 dev-platform comes the latest Zephyr RTOS and several minor improvements:
- Updated Zephyr to v4.4.0 (release notes)
- Added Zephyr framework support to Nucleo U575ZI-Q (#896)
- Updates for WeAct Studio STM32G474 CoreBoard (#900)
Related resources for the ST STM32 dev-platform:
Microchip AVR dev-platform v5.2
The latest release of the Microchip AVR dev-platform brings updates for highly customizable Arduino cores by MCUdude and minor improvements:
- Updated Arduino AVR core to v1.8.7 (release notes)
- Updated MCUdude cores:
- MajorCore v3.1.0 (release notes)
- MegaCore v3.1.0 (release notes)
- MightyCore v3.1.0 (release notes)
- MiniCore v3.1.2 (release notes)
- MicroCore v2.5.2 (release notes)
- Updated AVRDUDE packages to v8.1 for MCUdude cores (release notes)
Related resources for the Microchip AVR dev-platform:
Microchip megaAVR dev-platform v1.9
The new release of the Microchip megaAVR v1.9.0 brings several updated Arduino cores:
- Added new board
ATtiny416 Xplained Nano - Updated MegaCoreX to v1.1.6 (release notes)
- Updated megatinycore to v2.6.11 (release notes)
- Updated DxCore core to v1.6.2 (release notes)
- Updated AVRDUDE packages to v8.1 for MCUdude cores (release notes)
- Fixed serial port issue when burning bootloader (#67)
Related resources for the Microchip megaAVR dev-platform:
Teensy dev-platform v5.1
The new release of the Teensy dev-platform brings support for the latest Teensyduino v1.60 and minor improvements:
- Updated Teensyduino to v1.60 (release notes)
Related resources for the Teensy dev-platform:
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