Stm_common/stm32 Multi/multi_timer.c

/*
 * Copyright (c) 2016 Zibin Zheng <[email protected]>
 * All rights reserved
 */

#include "multi_timer.h"

//timer handle list head.
static struct Timer* head_handle = NULL;

//Timer ticks
//static uint32_t _timer_ticks = 0;
static uint16_t _timer_ticks = 0;


/**
  * @brief  Initializes the timer struct handle.
  * @param  handle: the timer handle strcut.
  * @param  timeout_cb: timeout callback.
  * @param  repeat: repeat interval time.
  * @retval None
  */
void timer_init_Head(void)
{
	head_handle = NULL;
}
void timer_init(struct Timer* handle, void(*timeout_cb)(), uint32_t timeout, uint32_t repeat)
{
	// memset(handle, 0, sizeof(struct Timer));
	handle->timeout_cb = timeout_cb;
	handle->timeout = _timer_ticks + timeout;
	handle->repeat = repeat;
}

void timer_app(struct Timer* handle, void(*timeout_cb)(), uint32_t timeout, uint32_t repeat)
{
	timer_init(handle, timeout_cb, timeout, repeat);
	timer_start(handle);
}
/**
  * @brief  Start the timer work, add the handle into work list.
  * @param  btn: target handle strcut.
  * @retval 0: succeed. -1: already exist.
  */
int timer_start(struct Timer* handle)
{
	struct Timer* target = head_handle;
	while(target) {
		if(target == handle) return -1;	//already exist.
		target = target->next;
	}
	handle->next = head_handle;
	head_handle = handle;
	return 0;
}

/**
  * @brief  Stop the timer work, remove the handle off work list.
  * @param  handle: target handle strcut.
  * @retval None
  */
void timer_stop(struct Timer* handle)
{
	struct Timer** curr;
	for(curr = &head_handle; *curr; ) {
		struct Timer* entry = *curr;
		if (entry == handle) {
			*curr = entry->next;
//			free(entry);
		} else
			curr = &entry->next;
	}
}

/**
  * @brief  main loop.
  * @param  None.
  * @retval None
  */
void timer_loop()
{
	struct Timer* target;
	for(target=head_handle; target; target=target->next) {
		if(((target->timeout < TIMER_MAX) && (_timer_ticks >= target->timeout))	|| \
			((target->timeout >= TIMER_MAX) && (_timer_ticks+TIMER_MAX >= target->timeout))
		)
		{
			if(target->repeat == 0) {		//Ò»´ÎÐÔ
				timer_stop(target);
			} else {						//Ñ­»·
				target->timeout = _timer_ticks + target->repeat;
			}
			target->timeout_cb();
		}
	}
}

/**
  * @brief  background ticks, timer repeat invoking interval 1ms.
  * @param  None.
  * @retval None.
  */
void timer_ticks()
{
	_timer_ticks += TIMER_TICK;
	if(_timer_ticks >= TIMER_MAX)	_timer_ticks = 0;
}