对软定时器的一些思考

只看该作者 · 2016-10-16 17:00

一直想在单片机上实现一个像MFC和WPF一样的软定时器，前段时间看了《编程魔法师》以后自己花了点时间写了个，使用时需把timer_run函数放到定时器中断服务函数里面（设想中实时操作都是短时任务），本来已发到CSDN上的，想了想还是回来也给大家看下，看能不能再优化下

复制



typedef struct _TIMER

{

        unsigned char isEnable;

        unsigned int  count;

        unsigned int  countNeed;

        void (*func)();        

}TIMER;







void timer_Run(TIMER *timer)

{

        if(timer.isEnable)

        {

                timer.count ++;

                if(timer.count == timer.countNeed)

                {

                        timer.count = 0;

                        timer.func();

                }

        }        

}



void startTimer(TIMER *timer)

{

        timer.count = 0;

        timer.isEnable = 1;

}



void stopTimer(TIMER *timer)

{

        timer.isEnable = 0;

        timer.count =0;

}

只看该作者 · 2016-10-16 17:01

发现个问题，上面的.需要换成->

只看该作者 · 2016-10-19 10:28

这个还是有点low了，需要在写中断的时候就要知道需要多少个定时器，需要经常维护，或许我们可以通过调用一个链表的方式实现

只看该作者 · 2016-10-25 11:27

跟这个做得很像
https://github.com/0x1abin/MultiTimer/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* 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;

/**
  * @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(struct Timer* handle, void(*timeout_cb)(), uint32_t timeout, uint32_t repeat)
{
// memset(handle, sizeof(struct Timer), 0);
handle->timeout_cb = timeout_cb;
handle->timeout = _timer_ticks + timeout;
handle->repeat = repeat;
}

/**
  * @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(_timer_ticks >= target->timeout)
{
if(target->repeat == 0)
{
timer_stop(target);
}
else
{
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++;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////

/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* All rights reserved
*/

#ifndef _MULTI_TIMER_H_
#define _MULTI_TIMER_H_

#include "stdint.h"

typedef struct Timer {
uint32_t timeout;
uint32_t repeat;
void (*timeout_cb)(void);
struct Timer* next;
}Timer;

#ifdef __cplusplus
extern "C" {
#endif

void timer_init(struct Timer* handle, void(*timeout_cb)(), uint32_t timeout, uint32_t repeat);
int  timer_start(struct Timer* handle);
void timer_stop(struct Timer* handle);
void timer_ticks(void);
void timer_loop(void);

// void timer_again(struct Timer* handle);
// void timer_set_repeat(struct Timer* handle, uint32_t repeat);

#ifdef __cplusplus
}
#endif

#endif

只看该作者 · 2016-10-25 14:03

21ndt 发表于 2016-10-25 11:27
跟这个做得很像
https://github.com/0x1abin/MultiTimer/*
* Copyright (c) 2016 Zibin Zheng

用链表实现可以更好的重复利用，看来有人和我想法一样

对软定时器的一些思考

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