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When accessing hardware registers in embedded C, compiler optimizations can silently break your code. The volatile keyword ensures the compiler reads the register each time. This article explains why volatile is essential, shows a GPIO ISR example, and discusses trade‑offs.
How and why to use volatile for memory-mapped hardware registers in embedded C, with a worked register-map example, assembly-level verification, and the limits of what volatile guarantees.
Learn why and how to use volatile for memory‑mapped registers in Embedded C, with a concrete LED‑toggle example, trade‑offs, and verification steps.
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