I used stm32cubemx to config stm32f407, when it entry stop mode, PA0 is used to wakeup MCU from stop mode, how to config system clk. when it entry into stop mode and leave stop mode

[hjk]

entry into stop mode:

  HAL_NVIC_EnableIRQ(EXTI0_IRQn);

  HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);

  __enable_irq();

HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

leave stop mode :

 __disable_irq();

 /* Configure the system clock */

 SYSCLKConfig_STOP();

__HAL_GPIO_EXTI_CLEAR_IT(WAKEUP_Pin);

//SystemClock_Config()

MX_GPIO_Init();

 MX_DMA_Init();

 MX_ADC1_Init();

 MX_CAN1_Init();

 MX_RTC_Init();

 MX_SPI1_Init();

 MX_USART1_UART_Init();

 MX_USART2_UART_Init();

 MX_USART3_UART_Init();

 MX_CAN2_Init();

 MX_USART6_UART_Init();

__HAL_SPI_ENABLE(&hspi1);

__enable_irq();

void SYSCLKConfig_STOP(void)

{

 __HAL_RCC_HSE_CONFIG(RCC_HSE_ON);

 while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET);

 __HAL_RCC_PLL_ENABLE();

 while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)

 {

 }

 __HAL_RCC_SYSCLK_CONFIG(RCC_SYSCLKSOURCE_PLLCLK);

 while(__HAL_RCC_GET_SYSCLK_SOURCE() != 0x08)

 {

 }

}

but it doesn't work, after wake up form stop mode , it fall in error handle. how to solve this issue?