152 lines
4.5 KiB
C
152 lines
4.5 KiB
C
/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org) and Contiki.
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki OS.
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*
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*
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*/
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#include <sys/clock.h>
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#include <sys/cc.h>
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#include <sys/etimer.h>
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#include <sys/rtimer.h>
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#include "contiki-conf.h"
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#include "mc1322x.h"
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#define MAX_TICKS (~((clock_time_t)0) / 2)
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static volatile clock_time_t current_clock = 0;
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volatile unsigned long seconds = 0;
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static struct rtimer rt_clock;
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/* the typical clock things like incrementing current_clock and etimer checks */
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/* are performed as a periodically scheduled rtimer */
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void
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rt_do_clock(struct rtimer *t, void *ptr)
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{
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rtimer_set(t, RTIMER_TIME(t) + (rtc_freq/CLOCK_CONF_SECOND) , 1,
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(rtimer_callback_t)rt_do_clock, ptr);
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current_clock++;
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if((current_clock % CLOCK_CONF_SECOND) == 0) {
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seconds++;
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}
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if(etimer_pending() &&
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(etimer_next_expiration_time() - current_clock - 1) > MAX_TICKS) {
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etimer_request_poll();
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}
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}
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/* RTC MUST have been already setup by mc1322x init */
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void
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clock_init(void)
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{
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rtimer_set(&rt_clock, RTIMER_NOW() + rtc_freq/CLOCK_CONF_SECOND, 1, (rtimer_callback_t)rt_do_clock, NULL);
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}
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clock_time_t
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clock_time(void)
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{
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return current_clock;
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}
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unsigned long
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clock_seconds(void)
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{
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return seconds;
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}
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void
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clock_wait(clock_time_t t)
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{
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clock_time_t endticks = current_clock + t;
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while ((signed long)(current_clock - endticks) < 0) {;}
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Delay the CPU for up to 65535 microseconds.
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* Use the 250KHz MACA clock for longer delays to avoid interrupt effects.
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* However that can't be used if the radio is being power cycled!
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*/
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void
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clock_delay_usec(uint16_t howlong)
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{
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if(howlong<2) return;
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#if 0
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if(howlong>400) {
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volatile register uint32_t i=*MACA_CLK+howlong/4;
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while (i > *MACA_CLK) ;
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return;
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}
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#endif
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/* These numbers at 25MHz, gcc -Os */
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volatile register uint32_t i=4000*howlong/2301;
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while(--i);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Delay the CPU for up to 65535 milliseconds. The watchdog is NOT disabled.
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*/
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void
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clock_delay_msec(uint16_t howlong)
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{
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while(howlong--) clock_delay_usec(1000);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Legacy delay. The original clock_delay for the msp430 used a granularity
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* of 2.83 usec. This approximates that delay for values up to 1456 usec.
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* (The largest core call in leds.c uses 400).
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*/
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void
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clock_delay(unsigned int howlong)
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{
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if(howlong--) return;
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clock_delay_usec((283*howlong)/100);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Adjust clock ticks after a cpu sleep.
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*/
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void clock_adjust_ticks(clock_time_t howmany) {
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/* Add seconds */
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seconds+=howmany/CLOCK_CONF_SECOND;
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/* Handle tick overflow */
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if(((current_clock % CLOCK_CONF_SECOND) + (howmany % CLOCK_CONF_SECOND)) >= CLOCK_CONF_SECOND) seconds++;
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/* Add ticks */
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current_clock+=howmany;
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}
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