141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/*
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* Copyright (c) 2016, SICS, Swedish ICT AB.
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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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/**
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* \file
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* CoAP timer driver implementation based on Contiki etimers
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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/**
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* \addtogroup coap-timer
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* @{
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*
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* \defgroup coap-timer-default CoAP timer for Contiki-NG
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* @{
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*
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* This is an implementation of CoAP timer for Contiki-NG.
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*/
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#include "coap-timer.h"
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#include "sys/clock.h"
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#include "sys/etimer.h"
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#include "sys/process.h"
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/* Log configuration */
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#include "coap-log.h"
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#define LOG_MODULE "coap-timer"
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#define LOG_LEVEL LOG_LEVEL_NONE
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PROCESS(coap_timer_process, "coap timer process");
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static uint64_t current_time;
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static struct etimer timer;
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/*---------------------------------------------------------------------------*/
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static void
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update_timer(void)
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{
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uint64_t remaining;
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remaining = coap_timer_time_to_next_expiration();
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LOG_DBG("remaining %lu msec\n", (unsigned long)remaining);
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if(remaining == 0) {
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/* Run as soon as possible */
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process_poll(&coap_timer_process);
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} else {
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remaining *= CLOCK_SECOND;
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remaining /= 1000;
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if(remaining > CLOCK_SECOND * 60) {
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/* Make sure the CoAP timer clock is updated at least once per minute */
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remaining = CLOCK_SECOND * 60;
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} else if(remaining < 1) {
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/* Wait minimum one system clock tick */
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remaining = 1;
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}
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etimer_set(&timer, (clock_time_t)remaining);
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(coap_timer_process, ev, data)
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{
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PROCESS_BEGIN();
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etimer_set(&timer, CLOCK_SECOND);
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_TIMER ||
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ev == PROCESS_EVENT_POLL);
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if(coap_timer_run()) {
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/* Needs to run again */
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process_poll(&coap_timer_process);
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} else {
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update_timer();
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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static uint64_t
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uptime(void)
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{
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static clock_time_t last;
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clock_time_t now;
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uint64_t diff;
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now = clock_time();
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diff = (clock_time_t)(now - last);
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if(diff > 0) {
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current_time += (diff * 1000) / CLOCK_SECOND;
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last = now;
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}
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return current_time;
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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process_start(&coap_timer_process, NULL);
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}
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/*---------------------------------------------------------------------------*/
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static void
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update(void)
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{
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process_poll(&coap_timer_process);
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}
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/*---------------------------------------------------------------------------*/
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const coap_timer_driver_t coap_timer_default_driver = {
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.init = init,
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.uptime = uptime,
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.update = update,
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};
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/*---------------------------------------------------------------------------*/
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/** @} */
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/** @} */
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