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251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
/**
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* \file
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*
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* \brief Timer functionality implementation.
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*
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* Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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#include "hal_timer.h"
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#include <utils_assert.h>
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#include <utils.h>
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#include <hal_atomic.h>
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#include <hpl_irq.h>
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/**
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* \brief Driver version
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*/
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#define DRIVER_VERSION 0x00000001u
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/**
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* \brief Timer flags
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*/
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#define TIMER_FLAG_QUEUE_IS_TAKEN 1
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#define TIMER_FLAG_INTERRUPT_TRIGERRED 2
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static void timer_add_timer_task(struct list_descriptor *list, struct timer_task *const new_task, const uint32_t time);
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static void timer_process_counted(struct _timer_device *device);
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/**
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* \brief Initialize timer
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*/
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int32_t timer_init(struct timer_descriptor *const descr, void *const hw, struct _timer_hpl_interface *const func)
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{
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ASSERT(descr && hw);
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_timer_init(&descr->device, hw);
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descr->time = 0;
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descr->device.timer_cb.period_expired = timer_process_counted;
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return ERR_NONE;
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}
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/**
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* \brief Deinitialize timer
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*/
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int32_t timer_deinit(struct timer_descriptor *const descr)
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{
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ASSERT(descr);
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_timer_deinit(&descr->device);
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return ERR_NONE;
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}
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/**
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* \brief Start timer
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*/
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int32_t timer_start(struct timer_descriptor *const descr)
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{
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ASSERT(descr);
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if (_timer_is_started(&descr->device)) {
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return ERR_DENIED;
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}
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_timer_start(&descr->device);
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return ERR_NONE;
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}
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/**
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* \brief Stop timer
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*/
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int32_t timer_stop(struct timer_descriptor *const descr)
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{
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ASSERT(descr);
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if (!_timer_is_started(&descr->device)) {
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return ERR_DENIED;
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}
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_timer_stop(&descr->device);
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return ERR_NONE;
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}
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/**
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* \brief Set amount of clock cycler per timer tick
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*/
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int32_t timer_set_clock_cycles_per_tick(struct timer_descriptor *const descr, const uint32_t clock_cycles)
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{
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ASSERT(descr);
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_timer_set_period(&descr->device, clock_cycles);
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return ERR_NONE;
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}
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/**
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* \brief Add timer task
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*/
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int32_t timer_add_task(struct timer_descriptor *const descr, struct timer_task *const task)
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{
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ASSERT(descr && task);
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descr->flags |= TIMER_FLAG_QUEUE_IS_TAKEN;
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if (is_list_element(&descr->tasks, task)) {
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descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN;
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ASSERT(false);
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return ERR_ALREADY_INITIALIZED;
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}
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task->time_label = descr->time;
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timer_add_timer_task(&descr->tasks, task, descr->time);
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descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN;
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if (descr->flags & TIMER_FLAG_INTERRUPT_TRIGERRED) {
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CRITICAL_SECTION_ENTER()
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descr->flags &= ~TIMER_FLAG_INTERRUPT_TRIGERRED;
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_timer_set_irq(&descr->device);
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CRITICAL_SECTION_LEAVE()
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}
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return ERR_NONE;
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}
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/**
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* \brief Remove timer task
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*/
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int32_t timer_remove_task(struct timer_descriptor *const descr, const struct timer_task *const task)
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{
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ASSERT(descr && task);
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descr->flags |= TIMER_FLAG_QUEUE_IS_TAKEN;
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if (!is_list_element(&descr->tasks, task)) {
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descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN;
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ASSERT(false);
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return ERR_NOT_FOUND;
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}
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list_delete_element(&descr->tasks, task);
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descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN;
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if (descr->flags & TIMER_FLAG_INTERRUPT_TRIGERRED) {
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CRITICAL_SECTION_ENTER()
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descr->flags &= ~TIMER_FLAG_INTERRUPT_TRIGERRED;
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_timer_set_irq(&descr->device);
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CRITICAL_SECTION_LEAVE()
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}
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return ERR_NONE;
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}
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/**
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* \brief Retrieve the amount of clock cycles in a tick
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*/
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int32_t timer_get_clock_cycles_in_tick(const struct timer_descriptor *const descr, uint32_t *const cycles)
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{
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ASSERT(descr && cycles);
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*cycles = _timer_get_period(&descr->device);
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return ERR_NONE;
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}
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/**
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* \brief Retrieve the current driver version
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*/
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uint32_t timer_get_version(void)
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{
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return DRIVER_VERSION;
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}
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/**
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* \internal Insert a timer task into sorted timer's list
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*
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* \param[in] head The pointer to the head of timer task list
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* \param[in] task The pointer to task to add
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* \param[in] time Current timer time
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*/
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static void timer_add_timer_task(struct list_descriptor *list, struct timer_task *const new_task, const uint32_t time)
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{
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struct timer_task *it, *prev = NULL, *head = (struct timer_task *)list_get_head(list);
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if (!head) {
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list_insert_as_head(list, new_task);
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return;
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}
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for (it = head; it; it = (struct timer_task *)list_get_next_element(it)) {
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uint32_t time_left;
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if (it->time_label <= time) {
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time_left = it->interval - (time - it->time_label);
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} else {
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time_left = it->interval - (0xFFFFFFFF - it->time_label) - time;
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}
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if (time_left >= new_task->interval)
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break;
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prev = it;
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}
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if (it == head) {
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list_insert_as_head(list, new_task);
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} else {
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list_insert_after(prev, new_task);
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}
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}
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/**
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* \internal Process interrupts
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*/
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static void timer_process_counted(struct _timer_device *device)
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{
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struct timer_descriptor *timer = CONTAINER_OF(device, struct timer_descriptor, device);
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struct timer_task * it = (struct timer_task *)list_get_head(&timer->tasks);
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uint32_t time = ++timer->time;
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if ((timer->flags & TIMER_FLAG_QUEUE_IS_TAKEN) || (timer->flags & TIMER_FLAG_INTERRUPT_TRIGERRED)) {
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timer->flags |= TIMER_FLAG_INTERRUPT_TRIGERRED;
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return;
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}
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while (it && ((time - it->time_label) >= it->interval)) {
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struct timer_task *tmp = it;
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list_remove_head(&timer->tasks);
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if (TIMER_TASK_REPEAT == tmp->mode) {
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tmp->time_label = time;
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timer_add_timer_task(&timer->tasks, tmp, time);
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}
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it = (struct timer_task *)list_get_head(&timer->tasks);
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tmp->cb(tmp);
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}
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}
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