?? rt_irq_gen.c
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#include <linux/module.h>#include <linux/kernel.h>#include <rtl_fifo.h>#include <linux/rtl.h>#include <asm/rt_irq.h>#include <asm/rt_time.h>#include <rtl_sched.h>#include <asm/io.h>#include <linux/cons.h>#include "common.h"#define TIMEOUT 100000#define SKIP 1000#define PERIOD 500RT_TASK mytask;RTIME min_response;RTIME max_response;struct sample samp;int skip;void fun(int t) { register int i; register int orig; int flags; RTIME before, after, response; while (1) { for (skip = 0; skip < SKIP; skip++) { r_save_flags(flags); r_cli(); outb_p(0, LPT_PORT); orig = inb_p(LPT_PORT + 1); outb(0xff, LPT_PORT); before = rt_get_time(); i = 0; while ((inb(LPT_PORT + 1) == orig) && ++i < TIMEOUT);/* while ((inb(LPT_PORT + 1) == orig) && rt_get_time() < before + TIMEOUT); */ after = rt_get_time(); if (i >= TIMEOUT) { rtl_printf("timeout!!!\n"); r_restore_flags(flags); rt_task_wait(); return; } response = after - before; if (response < min_response) { min_response = response; } if (response > max_response) { max_response = response; } r_restore_flags(flags); rt_task_wait(); } samp.min = min_response; samp.max = max_response; rtf_put(0, &samp, sizeof(samp)); }}int init_module(void){ RTIME now = rt_get_time(); min_response = 1000000000; max_response = 0; rtf_create(0, 4000); rt_task_init(&mytask, fun, 1, 3000, 4); rt_task_make_periodic(&mytask, now + 3000, PERIOD); return 0;}void cleanup_module(void){ rt_task_delete(&mytask); rtf_destroy(0);}?? 快捷鍵說明
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