Listing 3: Includes and defines for pp_flip.c
#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
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