contiki/cpu/mc1322x/clock.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.
*
* $Id: clock.c,v 1.2 2010/11/07 14:42:02 maralvira Exp $
*/
#include <sys/clock.h>
#include <sys/cc.h>
#include <sys/etimer.h>
#include "dev/leds.h"
#include "contiki-conf.h"
#include "mc1322x.h"
#include "contiki-conf.h"
#define MAX_TICKS (~((clock_time_t)0) / 2)
static volatile clock_time_t current_clock = 0;
volatile unsigned long seconds = 0;
#define TCF 15
#define TCF1 4
#define TCF2 5
void
clock_init()
{
/* timer setup */
/* CTRL */
#define COUNT_MODE 1 /* use rising edge of primary source */
#define PRIME_SRC 0xf /* Perip. clock with 128 prescale (for 24Mhz = 187500Hz)*/
#define SEC_SRC 0 /* don't need this */
#define ONCE 0 /* keep counting */
#define LEN 1 /* count until compare then reload with value in LOAD */
#define DIR 0 /* count up */
#define CO_INIT 0 /* other counters cannot force a re-initialization of this counter */
#define OUT_MODE 0 /* OFLAG is asserted while counter is active */
*TMR_ENBL = 0; /* tmrs reset to enabled */
*TMR0_SCTRL = 0;
*TMR0_CSCTRL =0x0040;
*TMR0_LOAD = 0; /* reload to zero */
*TMR0_COMP_UP = 1875; /* trigger a reload at the end */
*TMR0_CMPLD1 = 1875; /* compare 1 triggered reload level, 10HZ maybe? */
*TMR0_CNTR = 0; /* reset count register */
*TMR0_CTRL = (COUNT_MODE<<13) | (PRIME_SRC<<9) | (SEC_SRC<<7) | (ONCE<<6) | (LEN<<5) | (DIR<<4) | (CO_INIT<<3) | (OUT_MODE);
*TMR_ENBL = 0xf; /* enable all the timers --- why not? */
enable_irq(TMR);
}
void tmr0_isr(void) {
if(bit_is_set(*TMR(0,CSCTRL),TCF1)) {
current_clock++;
if((current_clock % CLOCK_CONF_SECOND) == 0) {
seconds++;
#if BLINK_SECONDS
leds_toggle(LEDS_GREEN);
#endif
}
if(etimer_pending() &&
(etimer_next_expiration_time() - current_clock - 1) > MAX_TICKS) {
etimer_request_poll();
}
/* clear the compare flags */
clear_bit(*TMR(0,SCTRL),TCF);
clear_bit(*TMR(0,CSCTRL),TCF1);
clear_bit(*TMR(0,CSCTRL),TCF2);
return;
} else {
/* this timer didn't create an interrupt condition */
return;
}
}
clock_time_t
clock_time(void)
{
return current_clock;
}
unsigned long
clock_seconds(void)
{
return seconds;
}
/* clock delay from cc2430 */
/* I don't see any documentation about how this routine is suppose to behave */
void
clock_delay(unsigned int len)
{
unsigned int i;
for(i = 0; i< len; i++) {
asm("nop");
}
}