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/** System Clock Configuration

*/

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct;

  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  RCC_PeriphCLKInitTypeDef PeriphClkInit;

    /**Configure the main internal regulator output voltage 

    */

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    /**Initializes the CPU, AHB and APB busses clocks 

    */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI;//选择HSI和LSI时钟

  RCC_OscInitStruct.HSIState = RCC_HSI_ON; //打开HSI

  RCC_OscInitStruct.HSICalibrationValue = 16; //HSI频率

  RCC_OscInitStruct.LSIState = RCC_LSI_ON; //打开LSI

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; //时钟源为HSI

  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4; //PLL倍频

  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) //初始化，错误监测

  {

    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_PLLCLK; // 设置系统时钟源为HSI

  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; //AHB分频系数为1

  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; //APB1分频系数为1

  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; //APB2分频系数为1

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)//配置时钟，同时设置FLASH延时周期

  {

    Error_Handler();

  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2; //外设时钟使能

  PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;

  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)

  {

    Error_Handler();

  }

    /**Configure the Systick interrupt time 

    */

  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick 

    */

  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */

  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);

}