Hacking Coroutines into C: A Mad Macro Experiment
2025-07-13
This article details the author's ingenious use of C macros to implement coroutines in embedded software development, avoiding the need for an RTOS and simplifying complex control flow logic. The author illustrates the complexity of the traditional state machine approach with an LED blinker example, then uses macros to transpile coroutine code into explicit state machines, achieving async-like functionality. While this method is verbose, it demonstrates the possibility of concurrent programming without an RTOS and showcases programmer creativity and deep understanding of low-level techniques. The article concludes by recommending Rust for serious coroutine development.
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