As the adoption of The Zephyr Project RTOS widens, there is an increased need for device drivers to be developed. In this talk, Mohammed Billoo will describe his experience implementing a driver in Zephyr for a custom USB device controller implemented in an FPGA. He will describe the process he followed to integrate the device driver with the Zephyr USB stack, the challenges he encountered, and the needed workarounds for successful driver integration. Mohammed will explain the next steps for this project and summarize some lessons learned.