During March 2026, Bert Abrath focused on improving the reliability of GPIO interrupt handling in the nxp-upstream/zephyr repository. He addressed a bug in the Zephyr GPIO SAM driver by implementing an interrupt mask register (IMR)-based guard at the ISR level, ensuring that callbacks were only triggered for enabled interrupts. This approach eliminated spurious GPIO interrupt callbacks, enhancing determinism and stability for embedded workflows that rely on precise interrupt behavior. Bert applied his expertise in C programming, embedded systems, and interrupt handling to deliver a targeted fix that reduced unintended behavior and improved the robustness of GPIO-driven applications within Zephyr.