time.c

微内核软实时操作系统

/*
 * Copyright (c) 2005, Kohsuke Ohtani
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors 
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * time.c - test time function
 */
#include <prex/prex.h>
#include <stdio.h>

u_long get_time(void)
{
	device_t rtc_dev;
	int err;
	u_long sec;
	size_t len;

	err = device_open("rtc", 0, &rtc_dev);
	if (err) {
		printf("error to open rtc device!\n");
		return 0;
	}		
	len = sizeof(sec);
	err = device_read(rtc_dev, &sec, &len, 0);
	if (err) {
		printf("error in reading from rtc device\n");
		device_close(rtc_dev);
		return 0;
	}
	device_close(rtc_dev);
	return sec;
}

int main(int argc, char *argv[])
{
	u_long sys_time;
	unsigned int sec, min, hour;

	printf("Time test program\n");
	
	sys_time = get_time();
	if (sys_time == 0)
		return 0;

	sec = sys_time % 60;
	min = (sys_time / 60) % 60;
	hour = (sys_time / 60 / 60) % 24;
	printf("Current time: %d:%d:%d\n", hour, min, sec);

	return 0;
}