Worked on the Zephyr project repository to enhance the reliability of the STM32 I2C driver, focusing on interrupt handling stability within embedded systems. Addressed a critical bug where improper management of transfer interrupts could lead to CPU stalls and infinite interrupt storms during error handling. Applied defensive C programming techniques to disable specific interrupts before completing error routines and ensured safe re-enablement in the correct phase of I2C communication. Maintained compatibility with target-mode configurations, preserving expected behavior across different operational modes. Demonstrated disciplined driver development and a methodical approach to traceable bug fixing, emphasizing robust I2C communication in embedded environments.