153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
|
|
* 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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <sys/clock.h>
|
|
#include <sys/cc.h>
|
|
#include <sys/etimer.h>
|
|
#include <sys/rtimer.h>
|
|
|
|
#include "contiki-conf.h"
|
|
#include "mc1322x.h"
|
|
|
|
#define MAX_TICKS (~((clock_time_t)0) / 2)
|
|
|
|
static volatile clock_time_t current_clock = 0;
|
|
|
|
volatile unsigned long seconds = 0;
|
|
|
|
static struct rtimer rt_clock;
|
|
|
|
/* the typical clock things like incrementing current_clock and etimer checks */
|
|
/* are performed as a periodically scheduled rtimer */
|
|
void
|
|
rt_do_clock(struct rtimer *t, void *ptr)
|
|
{
|
|
rtimer_set(t, RTIMER_TIME(t) + (rtc_freq/CLOCK_CONF_SECOND) , 1,
|
|
(rtimer_callback_t)rt_do_clock, ptr);
|
|
|
|
current_clock++;
|
|
|
|
if((current_clock % CLOCK_CONF_SECOND) == 0) {
|
|
seconds++;
|
|
}
|
|
|
|
if(etimer_pending() &&
|
|
(etimer_next_expiration_time() - current_clock - 1) > MAX_TICKS) {
|
|
etimer_request_poll();
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/* RTC MUST have been already setup by mc1322x init */
|
|
void
|
|
clock_init(void)
|
|
{
|
|
rtimer_set(&rt_clock, RTIMER_NOW() + rtc_freq/CLOCK_CONF_SECOND, 1, (rtimer_callback_t)rt_do_clock, NULL);
|
|
}
|
|
|
|
clock_time_t
|
|
clock_time(void)
|
|
{
|
|
return current_clock;
|
|
}
|
|
|
|
unsigned long
|
|
clock_seconds(void)
|
|
{
|
|
return seconds;
|
|
}
|
|
|
|
void
|
|
clock_wait(clock_time_t t)
|
|
{
|
|
clock_time_t endticks = current_clock + t;
|
|
while ((signed long)(current_clock - endticks) < 0) {;}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Delay the CPU for up to 65535 microseconds.
|
|
* Use the 250KHz MACA clock for longer delays to avoid interrupt effects.
|
|
* However that can't be used if the radio is being power cycled!
|
|
*/
|
|
void
|
|
clock_delay_usec(uint16_t howlong)
|
|
{
|
|
if(howlong<2) return;
|
|
#if 0
|
|
if(howlong>400) {
|
|
volatile register uint32_t i=*MACA_CLK+howlong/4;
|
|
while (i > *MACA_CLK) ;
|
|
return;
|
|
}
|
|
#endif
|
|
/* These numbers at 25MHz, gcc -Os */
|
|
volatile register uint32_t i=4000*howlong/2301;
|
|
while(--i);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Delay the CPU for up to 65535 milliseconds. The watchdog is NOT disabled.
|
|
*/
|
|
void
|
|
clock_delay_msec(uint16_t howlong)
|
|
{
|
|
while(howlong--) clock_delay_usec(1000);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Legacy delay. The original clock_delay for the msp430 used a granularity
|
|
* of 2.83 usec. This approximates that delay for values up to 1456 usec.
|
|
* (The largest core call in leds.c uses 400).
|
|
*/
|
|
void
|
|
clock_delay(unsigned int howlong)
|
|
{
|
|
if(howlong--) return;
|
|
clock_delay_usec((283*howlong)/100);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Adjust clock ticks after a cpu sleep.
|
|
*/
|
|
void clock_adjust_ticks(clock_time_t howmany) {
|
|
/* Add seconds */
|
|
seconds+=howmany/CLOCK_CONF_SECOND;
|
|
/* Handle tick overflow */
|
|
if(((current_clock % CLOCK_CONF_SECOND) + (howmany % CLOCK_CONF_SECOND)) >= CLOCK_CONF_SECOND) seconds++;
|
|
/* Add ticks */
|
|
current_clock+=howmany;
|
|
}
|