Extension and Application of the Operating System Real-Timeness Based on μCLinux

The paper proposes an implementation of the real-time μCLinux based on RTHAL(Real Time Hardware Abstract Layer). RTHAL with hard real-timeness runs between hardware and μCLinux,and only with a few modifications μCLinux can have harder real-timeness with a scheduling delay of about 3μs. The paper further proposes an effective method to calculate the size of the FIFO buffer for transferring real-time data stably between RTHAL and μCLinux. An example of real-time video coding proves the method can provide μCLinux with good real-timeness easily and effectively.