Developed SSD1306 OLED shield support for the NRF5340DK board in the renesas/zephyr repository, focusing on device driver and embedded systems development using C. The work involved increasing the I2C buffer size to ensure reliable communication between the shield and the board, addressing compatibility issues that previously limited hardware integration. Changes were applied to both secure and non-secure CPU application overlays, ensuring comprehensive platform coverage. This enhancement broadened Zephyr’s hardware support and improved the reliability of OLED shield operation on the NRF5340DK. The contribution demonstrates a methodical approach to embedded hardware integration and low-level driver development within open-source environments.