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timer1 overflow

Question asked by yazdansepas.iman on Oct 2, 2012
Hi guys 
I run timer 1 capture interrupt
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;


  /* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);


  /* GPIOA clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);


  /* TIM1 channel 2 pin (PE.11) configuration */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOE, &GPIO_InitStructure);


  /* Connect TIM pins to AF2 */
  GPIO_PinAFConfig(GPIOE, GPIO_PinSource11, GPIO_AF_TIM1);


  /* Enable the TIM1 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
 TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
 TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge;
 TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
 TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
 TIM_ICInitStructure.TIM_ICFilter = 0;


 TIM_ICInit(TIM1, &TIM_ICInitStructure);
 /* TIM enable counter */
 TIM_Cmd(TIM1, ENABLE);


 /* Enable the CC2 Interrupt Request */
 TIM_ITConfig(TIM1, TIM_IT_CC2|TIM_IT_Update, ENABLE);



 and capturing the signal with unknown sometimes it's 100 pulse sometimes it's 105. for this reason i can't detect stream end edge I want to detect counter overflow but it's seems i can't have two interrupt  in same time 
i add this line :TIM_ITConfig(TIM1, TIM_IT_CC2|TIM_IT_Update, ENABLE);
and check in this way in my while :
               if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
                 {
                    TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
                      TIM1OverFlow++;
                 }
but i haven't  anything .
how can i access to overflow flag during capturing ?
Thank you 

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