定时器

定时器静态创建函数返回值疑问

发布于 2022-04-29 11:03:28 浏览：1040 订阅该版

3 个回答

crystal266 2022-04-29

嵌入式

crystal266 2022-04-29

嵌入式

补充一下，对比静态和动态创建的代码，动态创建比静态创建多了申请空间的操作，返回值也是申请开机执行的结果。

静态创建 
```c
void rt_timer_init(rt_timer_t  timer,
                   const char *name,
                   void (*timeout)(void *parameter),
                   void       *parameter,
                   rt_tick_t   time,
                   rt_uint8_t  flag)
{
    /* timer check */
    RT_ASSERT(timer != RT_NULL);

/* timer object initialization */
    rt_object_init((rt_object_t)timer, RT_Object_Class_Timer, name);

_rt_timer_init(timer, timeout, parameter, time, flag);
}
```

动态创建
```c
rt_timer_t rt_timer_create(const char *name,
                           void (*timeout)(void *parameter),
                           void       *parameter,
                           rt_tick_t   time,
                           rt_uint8_t  flag)
{
    struct rt_timer *timer;

/* allocate a object */
    timer = (struct rt_timer *)rt_object_allocate(RT_Object_Class_Timer, name);
    if (timer == RT_NULL)
    {
        return RT_NULL;
    }

_rt_timer_init(timer, timeout, parameter, time, flag);

return timer;
}
```