ATmega MCU 타입을 위한 AVR-GCC 기반 임베디드 타스크 스케줄러

초록

This paper proposes a lightweight task scheduler useful for AVR-GCC-based embedded software projects on 8-bit ATmega microcontrollers. The task scheduler, which is mostly implemented in the C language, operates in a non-preemptive context-switching manner, leveraging the stack-frame characteristics of AVR-GCC. A running task voluntarily issues a yield request when it must wait for a certain period, wait for an external event, or detects a yield flag set by interrupts such as a timer interrupt. Compared to FreeRTOS, the proposed scheduler consumes less than 50% of the memory and achieves execution times up to 67% shorter under the given experimental conditions. However, due to its non-preemptive nature, its response time to general interrupts is about 5.8 times slower than that of FreeRTOS, whereas its response time to timer interrupts is significantly superior.

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