STM32L0

STM32L071从deep sleep唤醒之后时钟的问题

发布于 2019-06-20 15:10:01 浏览：2937 订阅该版

7 个回答

Tristan_C 2019-06-20

这家伙很懒，什么也没写！

Tristan_C 2019-06-20

这家伙很懒，什么也没写！

无奈之下注册了休眠状态改变事件
在事件回调函数中，退出休眠事件RT_PM_EXIT_SLEEP的话，重新配置时钟，就可以正常，HSI恢复运行，但这样的PM模式使用起来就得不停切换配置时钟了，请大神门指点呢。

```c
rt_pm_notify_set(sleep_switch, RT_NULL);
void sleep_switch(uint8_t event, uint8_t mode, void *data)
{
    if(RT_PM_ENTER_SLEEP == event)
    {
        rt_pin_write(LED0_PIN, PIN_LOW);
    }
    else if(RT_PM_EXIT_SLEEP == event)
    {
        rt_pin_write(LED0_PIN, PIN_HIGH);
        SystemClock_Config();
    }
}
```

时钟配置函数如下：
```c
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

/**Configure the main internal regulator output voltage 
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /**Configure LSE Drive Capability 
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
  /**Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /**Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}
```

![2nn7.png](https://club.rt-thread.org/uploads/201906/20/162014imfk7bfo2b7o2nn7.png)