/**
  * @brief  Wait 1 sec for LSE stabilization .
  * @param  None.
  * @retval None.
  * Note : TIM4 is configured for a system clock = 2MHz
  */
void LSE_StabTime(void)
{

  CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE);

  /* Configure TIM4 to generate an update event each 1 s */
  TIM4_TimeBaseInit(TIM4_Prescaler_16384, 123);
  /* Clear update flag */
  TIM4_ClearFlag(TIM4_FLAG_Update);

  /* Enable TIM4 */
  TIM4_Cmd(ENABLE);

  /* Wait 1 sec */
  while ( TIM4_GetFlagStatus(TIM4_FLAG_Update) == RESET );

  TIM4_ClearFlag(TIM4_FLAG_Update);

  /* Disable TIM4 */
  TIM4_Cmd(DISABLE);

  CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, DISABLE);
}