/* Configure the main PLL clock source, multiplication and division factors. */
    __HAL_RCC_PLL_CONFIG(RCC_OscInitStruct->PLL.PLLSource,
                         RCC_OscInitStruct->PLL.PLLMUL,
                         RCC_OscInitStruct->PLL.PLLDIV);
    /* Enable the main PLL. */
    __HAL_RCC_PLL_ENABLE();

    /* Get timeout */
    tickstart = HAL_GetTick();

    /* Wait till PLL is ready */
    while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
    {
      if((HAL_GetTick() - tickstart ) > RCC_PLL_TIMEOUT_VALUE)
      {
        return HAL_TIMEOUT;
      }
    }

/* Enter Stop Mode */
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

/* Stop interrupt that woke us up */
int ret = HAL_LPTIM_TimeOut_Stop_IT(&LptimHandle);
SystemDisableWakeupCounter();

/* Configures system clock after wake-up from STOP: enable HSI, PLL and select
PLL as system clock source (HSI and PLL are disabled automatically in STOP mode) */
SystemClockConfig_STOP();