Contiki 2.6

clock.c

00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science.
00003  * All rights reserved. 
00004  *
00005  * Redistribution and use in source and binary forms, with or without 
00006  * modification, are permitted provided that the following conditions 
00007  * are met: 
00008  * 1. Redistributions of source code must retain the above copyright 
00009  *    notice, this list of conditions and the following disclaimer. 
00010  * 2. Redistributions in binary form must reproduce the above copyright 
00011  *    notice, this list of conditions and the following disclaimer in the 
00012  *    documentation and/or other materials provided with the distribution. 
00013  * 3. Neither the name of the Institute nor the names of its contributors 
00014  *    may be used to endorse or promote products derived from this software 
00015  *    without specific prior written permission. 
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
00027  * SUCH DAMAGE. 
00028  *
00029  * This file is part of the Contiki operating system.
00030  * 
00031  * Author: Oliver Schmidt <ol.sc@web.de>
00032  *
00033  * $Id: clock.c,v 1.3 2008/07/12 14:46:03 oliverschmidt Exp $
00034  */
00035 
00036 #include <apple2.h>
00037 
00038 #include "contiki.h"
00039 #include "sys/log.h"
00040 
00041 /* The enhanced Apple//e doesn't have a hardware clock whatsoever. Therefore the
00042  * cc65 C-library for this target doesn't include an implementation of clock().
00043  */
00044 
00045 static unsigned char tick = 14;
00046 static clock_time_t time;
00047 
00048 /*-----------------------------------------------------------------------------------*/
00049 void
00050 clock_init(void)
00051 {
00052   if(get_ostype() >= APPLE_IIGS) {
00053     if(*(signed char *)0xC036 < 0) {
00054       /* 5 / 14 = 1.0MHz / 2.8MHz */
00055       tick = 5;
00056       log_message("Assuming 2.8 MHz ...", "");
00057     }
00058   }
00059 }
00060 /*-----------------------------------------------------------------------------------*/
00061 void
00062 clock_update(void)
00063 {
00064   static unsigned int count;
00065 
00066   count += tick;
00067   if(count > 2000) {
00068     count = 0;
00069     ++time;
00070   }
00071 }
00072 /*-----------------------------------------------------------------------------------*/
00073 clock_time_t
00074 clock_time(void)
00075 {
00076   return time;
00077 }
00078 /*-----------------------------------------------------------------------------------*/
00079 unsigned long
00080 clock_seconds(void)
00081 {
00082   return time / CLOCK_CONF_SECOND;
00083 }
00084 /*-----------------------------------------------------------------------------------*/