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* Copyright (c) 1997-2016 Wind River Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <kernel.h>
#include <misc/debug/object_tracing_common.h>
#include <init.h>
#include <wait_q.h>
extern struct k_timer _k_timer_list_start[];
extern struct k_timer _k_timer_list_end[];
struct k_timer *_trace_list_k_timer;
#ifdef CONFIG_DEBUG_TRACING_KERNEL_OBJECTS
/*
* Complete initialization of statically defined timers.
*/
static int init_timer_module(struct device *dev)
{
ARG_UNUSED(dev);
struct k_timer *timer;
for (timer = _k_timer_list_start; timer < _k_timer_list_end; timer++) {
SYS_TRACING_OBJ_INIT(k_timer, timer);
}
return 0;
}
SYS_INIT(init_timer_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
#endif /* CONFIG_DEBUG_TRACING_KERNEL_OBJECTS */
/**
* @brief Handle expiration of a kernel timer object.
*
* @param t Timeout used by the timer.
*
* @return N/A
*/
void _timer_expiration_handler(struct _timeout *t)
{
int key = irq_lock();
struct k_timer *timer = CONTAINER_OF(t, struct k_timer, timeout);
struct k_thread *pending_thread;
/*
* if the timer is periodic, start it again; don't add _TICK_ALIGN
* since we're already aligned to a tick boundary
*/
if (timer->period > 0) {
_add_timeout(NULL, &timer->timeout, &timer->wait_q,
timer->period);
}
/* update timer's status */
timer->status += 1;
/* invoke timer expiry function */
if (timer->expiry_fn) {
timer->expiry_fn(timer);
}
/*
* wake up the (only) thread waiting on the timer, if there is one;
* don't invoke _Swap() since the timeout ISR called us, not a thread
*/
pending_thread = _unpend_first_thread(&timer->wait_q);
if (pending_thread) {
_ready_thread(pending_thread);
_set_thread_return_value(pending_thread, 0);
}
irq_unlock(key);
}
void k_timer_init(struct k_timer *timer,
void (*expiry_fn)(struct k_timer *),
void (*stop_fn)(struct k_timer *))
{
timer->expiry_fn = expiry_fn;
timer->stop_fn = stop_fn;
timer->status = 0;
sys_dlist_init(&timer->wait_q);
_init_timeout(&timer->timeout, _timer_expiration_handler);
SYS_TRACING_OBJ_INIT(k_timer, timer);
timer->_legacy_data = NULL;
}
void k_timer_start(struct k_timer *timer, int32_t duration, int32_t period)
{
__ASSERT(duration >= 0 && period >= 0 &&
(duration != 0 || period != 0), "invalid parameters\n");
unsigned int key = irq_lock();
if (timer->timeout.delta_ticks_from_prev != -1) {
_abort_timeout(&timer->timeout);
}
timer->period = _ms_to_ticks(period);
_add_timeout(NULL, &timer->timeout, &timer->wait_q,
_TICK_ALIGN + _ms_to_ticks(duration));
timer->status = 0;
irq_unlock(key);
}
void k_timer_stop(struct k_timer *timer)
{
__ASSERT(!_is_in_isr(), "");
int key = irq_lock();
int stopped = _abort_timeout(&timer->timeout);
irq_unlock(key);
if (stopped == -1) {
return;
}
if (timer->stop_fn) {
timer->stop_fn(timer);
}
key = irq_lock();
struct k_thread *pending_thread = _unpend_first_thread(&timer->wait_q);
if (pending_thread) {
_ready_thread(pending_thread);
}
if (_is_in_isr()) {
irq_unlock(key);
} else {
_reschedule_threads(key);
}
}
uint32_t k_timer_status_get(struct k_timer *timer)
{
unsigned int key = irq_lock();
uint32_t result = timer->status;
timer->status = 0;
irq_unlock(key);
return result;
}
uint32_t k_timer_status_sync(struct k_timer *timer)
{
__ASSERT(!_is_in_isr(), "");
unsigned int key = irq_lock();
uint32_t result = timer->status;
if (result == 0) {
if (timer->timeout.delta_ticks_from_prev != -1) {
/* wait for timer to expire or stop */
_pend_current_thread(&timer->wait_q, K_FOREVER);
_Swap(key);
/* get updated timer status */
key = irq_lock();
result = timer->status;
} else {
/* timer is already stopped */
}
} else {
/* timer has already expired at least once */
}
timer->status = 0;
irq_unlock(key);
return result;
}
int32_t k_timer_remaining_get(struct k_timer *timer)
{
unsigned int key = irq_lock();
int32_t remaining_ticks;
if (timer->timeout.delta_ticks_from_prev == -1) {
remaining_ticks = 0;
} else {
/*
* compute remaining ticks by walking the timeout list
* and summing up the various tick deltas involved
*/
struct _timeout *t =
(struct _timeout *)sys_dlist_peek_head(&_timeout_q);
remaining_ticks = t->delta_ticks_from_prev;
while (t != &timer->timeout) {
t = (struct _timeout *)sys_dlist_peek_next(&_timeout_q,
&t->node);
remaining_ticks += t->delta_ticks_from_prev;
}
}
irq_unlock(key);
return _ticks_to_ms(remaining_ticks);
}
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