There are many reasons why you don't want a general purpose OS for a microcontroller: - Embedded systems are very price sensitive. if you're making it general

There are many reasons why you don't want a general purpose OS for a microcontroller: - Embedded systems are very price sensitive. if you're making it general purpose, you're wasting money. - Embedded systems generally have some form of real-time requirements. General Purpose OSes are not suitable here. - Time-Efficiency; don't waste cycles. - Space-efficiency; don't waste memory. - power-efficiency; be asleep as much as possible. Simple schedulers such as FreeRTOS/RTX/ChibiOS/etc/etc/etc are much more suitable, but better just to implement a nice simple super-loop. Primitive but efficient.