nes-proj/cpu/mc1322x/rtimer-arch.c

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/*
* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
* to the MC1322x project (http://mc1322x.devl.org) and Contiki.
*
* 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 Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki OS.
*
2011-02-13 22:12:33 +00:00
*
*/
/**
* \file
* mc1322x-specific rtimer code
* \author
* Mariano Alvira <mar@devl.org>
*/
#include <signal.h>
/* contiki */
#include "sys/energest.h"
#include "sys/rtimer.h"
/* mc1322x */
#include "utils.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static uint32_t last_rtc;
void
rtc_isr(void)
{
/* see note in table 5-13 of the reference manual: it takes at least two RTC clocks for the EVT bit to clear */
if ((CRM->RTC_COUNT - last_rtc) <= 2) {
CRM->STATUS = ~0; /* Clear all events */
// CRM->STATUSbits.RTC_WU_EVT = 1;
return;
}
last_rtc = CRM->RTC_COUNT;
/* Clear all events (for paranoia) */
/* clear RTC event flag (for paranoia)*/
// CRM->STATUSbits.RTC_WU_EVT = 1;
CRM->STATUS = ~0;
rtimer_run_next();
}
void
rtimer_arch_init(void)
{
last_rtc = CRM->RTC_COUNT;
/* enable timeout interrupts */
/* RTC WU is the periodic RTC timer */
/* TIMER WU is the wakeup timers (clocked from the RTC source) */
/* it does not appear you can have both enabled at the same time */
CRM->WU_CNTLbits.RTC_WU_EN = 1;
CRM->WU_CNTLbits.RTC_WU_IEN = 1;
enable_irq(CRM);
}
void
rtimer_arch_schedule(rtimer_clock_t t)
{
volatile uint32_t now;
now = rtimer_arch_now();
PRINTF("rtimer_arch_schedule time %u; now is %u\n", t, now);
/* Immediate interrupt if specified time is before current time. This may also
happen on counter overflow. */
if(now > t) {
CRM->RTC_TIMEOUT = 1;
} else {
CRM->RTC_TIMEOUT = t - now;
}
}
void
rtimer_arch_sleep(rtimer_clock_t howlong)
{
CRM->WU_CNTLbits.TIMER_WU_EN = 1;
CRM->WU_CNTLbits.RTC_WU_EN = 0;
CRM->WU_TIMEOUT = howlong;
/* the maca must be off before going to sleep */
/* otherwise the mcu will reboot on wakeup */
maca_off();
CRM->SLEEP_CNTLbits.DOZE = 0;
CRM->SLEEP_CNTLbits.RAM_RET = 3;
CRM->SLEEP_CNTLbits.MCU_RET = 1;
CRM->SLEEP_CNTLbits.DIG_PAD_EN = 1;
CRM->SLEEP_CNTLbits.HIB = 1;
/* wait for the sleep cycle to complete */
while((*CRM_STATUS & 0x1) == 0) { continue; }
/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and powers down */
*CRM_STATUS = 1;
/* asleep */
/* wait for the awake cycle to complete */
while((*CRM_STATUS & 0x1) == 0) { continue; }
/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and finishes wakeup */
*CRM_STATUS = 1;
CRM->WU_CNTLbits.TIMER_WU_EN = 0;
CRM->WU_CNTLbits.RTC_WU_EN = 1;
/* reschedule clock ticks */
clock_init();
clock_adjust_ticks((CRM->WU_COUNT*CLOCK_CONF_SECOND)/rtc_freq);
}