stm32L431进入低功耗会自动唤醒

发布于 2021-05-12 15:42:50 浏览：1466 订阅该版

```c
/* 从邮箱中收取邮件 */
        if (rt_mb_recv(&pm_mb, (rt_ubase_t *)&sleep_time, rt_tick_from_millisecond(500)) == RT_EOK)
        {
            pm_enter_sleep();
            //rt_thread_delay(1000);
            /* 开始进入低功耗模式 */
            rt_kprintf("Request Sleep %d s\n", sleep_time);
            mcu_power_wake = TIME_WAKE;
            #ifdef RT_USING_PM
                    rt_pm_request(PM_SLEEP_MODE_DEEP);
            #endif
                    rt_kprintf("sleep_time=%d\n",sleep_time);
                    get_rtc_time(&curtime);
                    //rt_kprintf("rtc_time=%s\n",curtime);
                    rt_sem_take(&weak_sem, rt_tick_from_millisecond(sleep_time*1000));
            #ifdef RT_USING_PM
                    rt_pm_release(PM_SLEEP_MODE_DEEP);
            #endif
                    pm_exit_sleep();
                    /* 退出低功耗模式 */
                    rt_kprintf("Sleep %d ms\n", get_interval());
                    rt_sem_release(&pm_sem);
        }
        else{
                /* set LED0 pin level to high or low */
                rt_pin_write(LED0_PIN, number%2);
                //rt_pin_write(MCU_DG_PIN, number%2);
                number++;
        }
```
以下是打印
```
        [15:34:42.209]收←◆ ******   进入休眠   ******
 ##########第一次##########
[15:34:42.513]收←◆Request Sleep 10 s
sleep_time=10
Sleep 0 ms

[15:34:42.715]收←◆ ******   退出休眠   ******
 sleep get_wake_type = 3

[15:34:42.842]收←◆休眠 ——————————>静置

[15:34:47.602]收←◆****   断开放电MOS  ****

##########第二次##########
[15:34:48.044]收←◆*****       静置——————>休眠     *****

[15:34:48.252]收←◆ ******   进入休眠   ******
 
[15:34:48.554]收←◆Request Sleep 10 s
sleep_time=10
Sleep 0 ms

[15:34:48.758]收←◆ ******   退出休眠   ******
 sleep get_wake_type = 3

[15:34:48.887]收←◆休眠 ——————————>静置

[15:34:57.827]收←◆****   断开放电MOS  ****

##########第三次##########
[15:34:58.136]收←◆*****       静置——————>休眠     *****

[15:34:58.297]收←◆ ******   进入休眠   ******
 
[15:34:58.642]收←◆Request Sleep 10 s
sleep_time=10

[15:35:08.592]收←◆Sleep 10000 ms
“sleep get_wake_type = 3”
```
睡眠10S，时间到了自动唤醒，类型为3，现在的啥问题是，进入休眠，没有任何外部唤醒信号，立马就出来了，总是来来回回三次才能进去，不太清楚是咋回事，请教以下