Contiki 2.6

rtimer-arch.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
00003  * to the MC1322x project (http://mc1322x.devl.org) and Contiki.
00004  *
00005  * All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright
00013  *    notice, this list of conditions and the following disclaimer in the
00014  *    documentation and/or other materials provided with the distribution.
00015  * 3. Neither the name of the Institute nor the names of its contributors
00016  *    may be used to endorse or promote products derived from this software
00017  *    without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00021  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00022  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00023  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00024  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00025  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00026  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00027  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00028  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00029  * SUCH DAMAGE.
00030  *
00031  * This file is part of the Contiki OS.
00032  *
00033  *
00034  */
00035 
00036 /**
00037  * \file
00038  *         mc1322x-specific rtimer code
00039  * \author
00040  *         Mariano Alvira <mar@devl.org>
00041  */
00042 
00043 #include <signal.h>
00044 
00045 /* contiki */
00046 #include "sys/energest.h"
00047 #include "sys/rtimer.h"
00048 
00049 /* mc1322x */
00050 #include "utils.h"
00051 
00052 #define DEBUG 0
00053 #if DEBUG
00054 #include <stdio.h>
00055 #define PRINTF(...) printf(__VA_ARGS__)
00056 #else
00057 #define PRINTF(...)
00058 #endif
00059 
00060 void rtc_isr(void) {
00061         PRINTF("rtc_wu_irq\n\r");
00062         PRINTF("now is %u\n", rtimer_arch_now());
00063         disable_rtc_wu();
00064         disable_rtc_wu_irq();
00065         rtimer_run_next();
00066         clear_rtc_wu_evt();
00067 }
00068 
00069 void
00070 rtimer_arch_init(void)
00071 {
00072 }
00073 
00074 void
00075 rtimer_arch_schedule(rtimer_clock_t t)
00076 {
00077         volatile uint32_t now;
00078         now = rtimer_arch_now();
00079         PRINTF("rtimer_arch_schedule time %u; now is %u\n", t,now);
00080 
00081 #if 1
00082 /* If specified time is always in the future, counter can wrap without harm */
00083         *CRM_RTC_TIMEOUT = t - now;
00084 #else
00085 /* Immediate interrupt if specified time is before current time. This may also
00086    happen on counter overflow. */
00087         if(now>t) {
00088                 *CRM_RTC_TIMEOUT = 1;
00089         } else {
00090                 *CRM_RTC_TIMEOUT = t - now;
00091         }
00092 #endif
00093 
00094         clear_rtc_wu_evt();
00095         enable_rtc_wu();
00096         enable_rtc_wu_irq();
00097         PRINTF("rtimer_arch_schedule CRM_RTC_TIMEOUT is %u\n", *CRM_RTC_TIMEOUT);
00098 }