请问如何实现毫秒计时

发布于 2018-08-30 21:14:27 浏览：2775 订阅该版

6 个回答

bernard 2018-08-30

这家伙很懒，什么也没写！

jingyes239 2018-08-31

这家伙很懒，什么也没写！

[i=s] 本帖最后由 jingyes239 于 2018-8-31 07:46 编辑 [/i]

```
/**
*本函数用于监测rtt时钟秒针变化时，
*将systick钩子跳转到base_systick_hook2
*
*/
void base_systick_hook1(void)
{
	static rt_int8_t presec = -1;

if ((gtime.tm_sec != presec) && (presec != -1))
	{
		presec = -1;
		rt_clock_systick_sethook(base_systick_hook2);
	}
	presec = gtime.tm_sec;
}

/**
*用于实现毫秒计时，systick钩子
*/
void base_systick_hook2(void)
{
	_gmillionsec = (_gmillionsec + 1) % 1000;
}
void base_clock_init(void)
{
	rt_clock_systick_sethook(base_systick_hook1);	
}
```

clock.c

```
#ifdef RT_USING_MILLIONSEC
static void (*rt_clock_systick_hook)();
void rt_clock_systick_sethook(void (*hook)(void))
{
    rt_clock_systick_hook = hook;
}
#endif
```

```
void rt_tick_increase(void)
{
...
   #ifdef RT_USING_MILLIONSEC
        if (rt_clock_systick_hook != RT_NULL)
        {
            rt_clock_systick_hook();
        }
    #endif
}
```

rtthread.h

```
#ifdef RT_USING_MILLIONSEC
void rt_clock_systick_sethook(void (*hook)(void));
#endif
```

rtconfig.h

```
/*Using millsec in clock tick*/
#define RT_USING_MILLIONSEC
```