Kernel

软件定时器有重置的函数么？

发布于 2018-08-08 09:58:54 浏览：1715 订阅该版

2 个回答

leewo0 2018-08-17

这家伙很懒，什么也没写！

yaomo718 2018-08-08

这家伙很懒，什么也没写！

可以实现的。
在修改定时器时间之前，先停止定时器，然后使用rt_timer_control函数修改定时器参数，然后再启动定时器。
假设已经定义了一个定时器控制块user_timer，定时时间为n个tick：

```

rt_timer_stop(user_timer);
    rt_timer_control(user_timer, );
    rt_timer_start(user_timer, RT_TIMER_CTRL_SET_TIME, n);  //n为你需要的定时时间
```

rt_timer_control所支持的命令请见timer的这段源码：

```
/**
 * This function will get or set some options of the timer
 *
 * @param timer the timer to be get or set
 * @param cmd the control command
 * @param arg the argument
 *
 * @return RT_EOK
 */
rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg)
{
    /* timer check */
    RT_ASSERT(timer != RT_NULL);

switch (cmd)
    {
    case RT_TIMER_CTRL_GET_TIME:
        *(rt_tick_t *)arg = timer->init_tick;
        break;

case RT_TIMER_CTRL_SET_TIME:
        timer->init_tick = *(rt_tick_t *)arg;
        break;

case RT_TIMER_CTRL_SET_ONESHOT:
        timer->parent.flag &= ~RT_TIMER_FLAG_PERIODIC;
        break;

case RT_TIMER_CTRL_SET_PERIODIC:
        timer->parent.flag |= RT_TIMER_FLAG_PERIODIC;
        break;
    }

return RT_EOK;
}
RTM_EXPORT(rt_timer_control);

```