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