软件定时器回调中使用i2c读取数据导致RT_TIMER断言

发布于 2021-01-29 14:44:48 浏览：1637 订阅该版

2 个回答

张世争 2021-01-29

学以致用

晓枫VS枯叶 2021-01-29

这家伙很懒，什么也没写！

张世争 2021-01-29

学以致用

晓枫VS枯叶 2021-01-29

这家伙很懒，什么也没写！

张世争 2021-01-29

学以致用

晓枫VS枯叶 2021-01-29

这家伙很懒，什么也没写！

```c
void rt_soft_timer_check(void)
{
    rt_tick_t current_tick;
    struct rt_timer *t;
    register rt_base_t level;
    rt_list_t list = RT_LIST_OBJECT_INIT(list);

RT_DEBUG_LOG(RT_DEBUG_TIMER, ("software timer check enter\n"));

/* disable interrupt */
    level = rt_hw_interrupt_disable();

while (!rt_list_isempty(&rt_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
    {
        t = rt_list_entry(rt_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
                            struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);

current_tick = rt_tick_get();

/*
         * It supposes that the new tick shall less than the half duration of
         * tick max.
         */
        if ((current_tick - t->timeout_tick) < RT_TICK_MAX / 2)
        {
            RT_OBJECT_HOOK_CALL(rt_timer_enter_hook, (t));

/* remove timer from timer list firstly */
            _rt_timer_remove(t);
            if (!(t->parent.flag & RT_TIMER_FLAG_PERIODIC))
            {
                t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
            }
            /* add timer to temporary list  */
            rt_list_insert_after(&list, &(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));

soft_timer_status = RT_SOFT_TIMER_BUSY;
            /* enable interrupt */
            rt_hw_interrupt_enable(level);

/* call timeout function */
            t->timeout_func(t->parameter);

RT_OBJECT_HOOK_CALL(rt_timer_exit_hook, (t));
            RT_DEBUG_LOG(RT_DEBUG_TIMER, ("current tick: %d\n", current_tick));

/* disable interrupt */
            level = rt_hw_interrupt_disable();

soft_timer_status = RT_SOFT_TIMER_IDLE;
            /* Check whether the timer object is detached or started again */
            if (rt_list_isempty(&list))
            {
                continue;
            }
            rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
            if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
                (t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
            {
                /* start it */
                t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
                rt_timer_start(t);
            }
        }
        else break; /* not check anymore */
    }
    /* enable interrupt */
    rt_hw_interrupt_enable(level);

RT_DEBUG_LOG(RT_DEBUG_TIMER, ("software timer check leave\n"));
}
```
这部分内核代码t->timeout_func(t->parameter);运行之前t的地址是存在的，运行之后t就变成NULL,而且驱动里面的没有加延时！