static void SystemClockConfig_STOP(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  
  /* Enable Power Control clock */
  __PWR_CLK_ENABLE();

  /* The voltage scaling allows optimizing the power consumption when the device is 
     clocked below the maximum system frequency, to update the voltage scaling value 
     regarding system frequency refer to product datasheet.  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /* Poll VOSF bit of in PWR_CSR. Wait until it is reset to 0 */
  while (__HAL_PWR_GET_FLAG(PWR_FLAG_VOS) != RESET) {};

  /* Get the Oscillators configuration according to the internal RCC registers */
  HAL_RCC_GetOscConfig(&RCC_OscInitStruct);

  /* After wake-up from STOP reconfigure the system clock: Enable HSI and PLL */
  RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState            = RCC_HSE_ON;
  RCC_OscInitStruct.HSIState            = RCC_HSI_OFF;
  RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSE;
  //RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLMUL          = RCC_PLL_MUL6;
  RCC_OscInitStruct.PLL.PLLDIV          = RCC_PLL_DIV2;
  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    //Error_Handler();
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
     clocks dividers */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    //Error_Handler();
  }
}