RTOS

FreeRTOS

• lightweight & lowlevel

Function calls

• xTaskCreate
• vTaskDelay

Resources

• freertos.org
• FreeRTOS With Arduino Tutorials 2 - How to Handle Tasks with FreeRTOS on Arduino
• Using Arduino IDE with Adafruit M0/M4

Zephyr

• Integral part of the Nordic SDK
• Blinking an LED with the Zephyr RTOS - Adafruit Learn article