151 lines
4.2 KiB
C
151 lines
4.2 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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/**
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* \file
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* mc1322x-specific rtimer code
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* \author
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* Mariano Alvira <mar@devl.org>
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*/
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#include <signal.h>
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/* contiki */
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#include "sys/energest.h"
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#include "sys/rtimer.h"
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/* mc1322x */
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#include "utils.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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static uint32_t last_rtc;
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void
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rtc_isr(void)
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{
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/* see note in table 5-13 of the reference manual: it takes at least two RTC clocks for the EVT bit to clear */
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if ((CRM->RTC_COUNT - last_rtc) <= 2) {
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CRM->STATUS = ~0; /* Clear all events */
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// CRM->STATUSbits.RTC_WU_EVT = 1;
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return;
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}
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last_rtc = CRM->RTC_COUNT;
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/* Clear all events (for paranoia) */
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/* clear RTC event flag (for paranoia)*/
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// CRM->STATUSbits.RTC_WU_EVT = 1;
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CRM->STATUS = ~0;
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rtimer_run_next();
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}
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void
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rtimer_arch_init(void)
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{
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last_rtc = CRM->RTC_COUNT;
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/* enable timeout interrupts */
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/* RTC WU is the periodic RTC timer */
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/* TIMER WU is the wakeup timers (clocked from the RTC source) */
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/* it does not appear you can have both enabled at the same time */
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CRM->WU_CNTLbits.RTC_WU_EN = 1;
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CRM->WU_CNTLbits.RTC_WU_IEN = 1;
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enable_irq(CRM);
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}
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void
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rtimer_arch_schedule(rtimer_clock_t t)
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{
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volatile uint32_t now;
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now = rtimer_arch_now();
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PRINTF("rtimer_arch_schedule time %u; now is %u\n", t, now);
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/* Immediate interrupt if specified time is before current time. This may also
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happen on counter overflow. */
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if(now > t) {
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CRM->RTC_TIMEOUT = 1;
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} else {
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CRM->RTC_TIMEOUT = t - now;
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}
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}
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void
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rtimer_arch_sleep(rtimer_clock_t howlong)
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{
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CRM->WU_CNTLbits.TIMER_WU_EN = 1;
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CRM->WU_CNTLbits.RTC_WU_EN = 0;
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CRM->WU_TIMEOUT = howlong;
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/* the maca must be off before going to sleep */
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/* otherwise the mcu will reboot on wakeup */
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maca_off();
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CRM->SLEEP_CNTLbits.DOZE = 0;
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CRM->SLEEP_CNTLbits.RAM_RET = 3;
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CRM->SLEEP_CNTLbits.MCU_RET = 1;
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CRM->SLEEP_CNTLbits.DIG_PAD_EN = 1;
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CRM->SLEEP_CNTLbits.HIB = 1;
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/* wait for the sleep cycle to complete */
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while((*CRM_STATUS & 0x1) == 0) { continue; }
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/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and powers down */
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*CRM_STATUS = 1;
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/* asleep */
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/* wait for the awake cycle to complete */
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while((*CRM_STATUS & 0x1) == 0) { continue; }
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/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and finishes wakeup */
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*CRM_STATUS = 1;
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CRM->WU_CNTLbits.TIMER_WU_EN = 0;
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CRM->WU_CNTLbits.RTC_WU_EN = 1;
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/* reschedule clock ticks */
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clock_init();
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clock_adjust_ticks((CRM->WU_COUNT*CLOCK_CONF_SECOND)/rtc_freq);
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}
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