Building a Wearable Device with Zephyr
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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