Kernel

rt thread有没有绝对延时和相对延时

发布于 2019-06-18 15:25:51 浏览：2747 订阅该版

3 个回答

quandevil 2019-06-18

这家伙很懒，什么也没写！

353896039 2019-06-18

这家伙很懒，什么也没写！

还没想好 2019-06-20

这家伙很懒，什么也没写！

可以自己做一个这样子的延时，这里贴一段代码，供楼主参考

```
#include <rtthread.h>

struct d_until
{
    struct rt_timer time;
    struct rt_semaphore sem;
    rt_tick_t tick;
};
typedef struct d_until * d_until_t;

static void thread_delay_until_handle(void *param)
{
    d_until_t _obj = param;

rt_sem_release(&_obj->sem);
}

d_until_t delay_until_create(const char *name)
{
    d_until_t _obj;

_obj = rt_malloc(sizeof(struct d_until));
    if (_obj == RT_NULL)
    {
        return RT_NULL;
    }
    rt_memset(_obj, 0, sizeof(struct d_until));
    rt_timer_init(&_obj->time, name, thread_delay_until_handle,
                    _obj, 0, RT_TIMER_FLAG_PERIODIC);
    rt_sem_init(&_obj->sem, name, 0, RT_IPC_FLAG_FIFO);
    return _obj;
}

rt_err_t delay_until_run(d_until_t obj, rt_tick_t tick)
{
    if (obj->tick != tick)
    {
        rt_timer_stop(&obj->time);
        rt_timer_control(&obj->time, RT_TIMER_CTRL_SET_TIME, &tick);
        obj->tick = tick;
        rt_timer_start(&obj->time);
    }
    return rt_sem_take(&obj->sem, RT_WAITING_FOREVER);
}

void delay_until_delete(d_until_t obj)
{
    rt_timer_detach(&obj->time);
    rt_sem_detach(&obj->sem);
}
```