a752c7ab
 elopes
add first test an...
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/*
* Copyright (C) 2016-17 Kaspar Schleiser <kaspar@schleiser.de>
* 2017 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup sys_evtimer
* @{
*
* @file
* @brief event timer implementation
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Martine Lenders <m.lenders@fu-berlin.de>
*
* @}
*/
#include "div.h"
#include "irq.h"
#include "xtimer.h"
#include "evtimer.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
/* XXX this function is intentionally non-static, since the optimizer can't
* handle the pointer hack in this function */
void evtimer_add_event_to_list(evtimer_t *evtimer, evtimer_event_t *event)
{
uint32_t delta_sum = 0;
/* we want list->next to point to the first list element. thus we take the
* *address* of evtimer->events, then cast it from (evtimer_event_t **) to
* (evtimer_event_t*). After that, list->next actually equals
* evtimer->events. */
evtimer_event_t *list = (evtimer_event_t *)&evtimer->events;
while (list->next) {
evtimer_event_t *list_entry = list->next;
if ((list_entry->offset + delta_sum) > event->offset) {
break;
}
delta_sum += list_entry->offset;
list = list->next;
}
event->next = list->next;
if (list->next) {
evtimer_event_t *next_entry = list->next;
next_entry->offset += delta_sum;
next_entry->offset -= event->offset;
}
event->offset -= delta_sum;
list->next = event;
}
static void _del_event_from_list(evtimer_t *evtimer, evtimer_event_t *event)
{
evtimer_event_t *list = (evtimer_event_t *) &evtimer->events;
while (list->next) {
evtimer_event_t *list_entry = list->next;
if (list_entry == event) {
list->next = event->next;
if (list->next) {
list_entry = list->next;
list_entry->offset += event->offset;
}
break;
}
list = list->next;
}
}
static void _set_timer(xtimer_t *timer, uint32_t offset)
{
uint64_t offset_in_us = (uint64_t)offset * 1000;
DEBUG("evtimer: now=%" PRIu32 " setting xtimer to %" PRIu32 ":%" PRIu32 "\n",
xtimer_now_usec(), (uint32_t)(offset_in_us >> 32),
(uint32_t)(offset_in_us));
_xtimer_set64(timer, offset_in_us, offset_in_us >> 32);
}
static void _update_timer(evtimer_t *evtimer)
{
if (evtimer->events) {
evtimer_event_t *event = evtimer->events;
_set_timer(&evtimer->timer, event->offset);
}
else {
xtimer_remove(&evtimer->timer);
}
}
static uint32_t _get_offset(xtimer_t *timer)
{
uint64_t now = xtimer_now_usec64();
uint64_t target = ((uint64_t)timer->long_target) << 32 | timer->target;
if (target <= now) {
return 0;
}
else {
target -= now;
/* add half of 125 so integer division rounds to nearest */
return div_u64_by_125((target >> 3) + 62);
}
}
static void _update_head_offset(evtimer_t *evtimer)
{
if (evtimer->events) {
evtimer_event_t *event = evtimer->events;
event->offset = _get_offset(&evtimer->timer);
DEBUG("evtimer: _update_head_offset(): new head offset %" PRIu32 "\n", event->offset);
}
}
void evtimer_add(evtimer_t *evtimer, evtimer_event_t *event)
{
unsigned state = irq_disable();
DEBUG("evtimer_add(): adding event with offset %" PRIu32 "\n", event->offset);
_update_head_offset(evtimer);
evtimer_add_event_to_list(evtimer, event);
if (evtimer->events == event) {
_set_timer(&evtimer->timer, event->offset);
}
irq_restore(state);
if (sched_context_switch_request) {
thread_yield_higher();
}
}
void evtimer_del(evtimer_t *evtimer, evtimer_event_t *event)
{
unsigned state = irq_disable();
DEBUG("evtimer_del(): removing event with offset %" PRIu32 "\n", event->offset);
_update_head_offset(evtimer);
_del_event_from_list(evtimer, event);
_update_timer(evtimer);
irq_restore(state);
}
static evtimer_event_t *_get_next(evtimer_t *evtimer)
{
evtimer_event_t *event = evtimer->events;
if (event && (event->offset == 0)) {
evtimer->events = event->next;
return event;
}
else {
return NULL;
}
}
static void _evtimer_handler(void *arg)
{
DEBUG("_evtimer_handler()\n");
evtimer_t *evtimer = (evtimer_t *)arg;
/* this function gets called directly by xtimer if the set xtimer expired.
* Thus the offset of the first event is down to zero. */
evtimer_event_t *event = evtimer->events;
event->offset = 0;
/* iterate the event list */
while ((event = _get_next(evtimer))) {
evtimer->callback(event);
}
_update_timer(evtimer);
}
void evtimer_init(evtimer_t *evtimer, evtimer_callback_t handler)
{
evtimer->callback = handler;
evtimer->timer.callback = _evtimer_handler;
evtimer->timer.arg = (void *)evtimer;
evtimer->events = NULL;
}
void evtimer_print(const evtimer_t *evtimer)
{
evtimer_event_t *list = evtimer->events;
while (list->next) {
evtimer_event_t *list_entry = list->next;
printf("ev offset=%u\n", (unsigned)list_entry->offset);
list = list->next;
}
}
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