\sourcecomment{Includes and Defines for pp\_flip.c}
\begin{verbatim}
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <rtlinux/rtl_sched.h>
#include <asm/io.h>

#define LPT1_DATA 0x378     // parallel port 1 data
#define FRQ 1000            // thread period in Hz...
#define FRAME_PERIOD_NS ((hrtime_t)((1.0/FRQ) * 1000000000.0))
                            // ...and in ns
\end{verbatim}
