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Building a Wearable Device with Zephyr

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Linux

The Linux Foundation’s open source Zephyr Project received considerable attention at this February’s Embedded Linux Conference (ELC). Although there are still no shipping products running this lightweight real-time operating system (RTOS) for microcontrollers, Fabien Parent and Neil Armstrong of the French embedded firm BayLibre shared their experiences in developing a wearable device that may end up being the first Zephyr-based consumer electronics product.

BayLibre’s device has an ARM Cortex-A SoC connected via an SPI bus to a Cortex-M4 STM32L4xx. This is linked via I2C to other, more lightweight Cortex-M cores. Parent and Armstrong could say no more about the design, but they explained why they chose Zephyr and discussed the project’s pros and cons.

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