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TIM1_CC_IRQHandler is not called

Question asked by bauer.hans on Apr 11, 2012
Latest reply on Apr 13, 2012 by bauer.hans
Hi,

I`m working with the STM32F103XC processor (lqfp144 package) and I want to use the input capture mode for the Timer1. At the moment I didn`t get any timer interrupt while the I/O PE13 has a lot of rising edges.

Maybe there`s something wrong with the PE13 pin which has as alternative function TIM1_CH3.

Here`s my init code.
RCC->APB2ENR |= (1 << 6);  // enable peripheral clock for GPIOE/* INT input PE13 -> mit timer1 verwenden */   
GPIOE->CRH &= ~0x00F00000;    // reset port-pin  
GPIOE->CRH |=  0x00400000// set input mode floating 
 
 
RCC->APB2ENR |= RCC_APB2Periph_TIM1; 
 
 
/* Enable the TIM3 global Interrupt */ 
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQChannel; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; 
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStructure); 
 
TIM_TimeBaseStructure.TIM_Period       = 0xFFFF; 
TIM_TimeBaseStructure.TIM_Prescaler     = 1; 
TIM_TimeBaseStructure.TIM_ClockDivision    = 0; 
TIM_TimeBaseStructure.TIM_CounterMode     = TIM_CounterMode_Up; 
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 
 
 
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3; 
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; 
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_IndirectTI; //PE13  
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;        // Div:1, every edge  
TIM_ICInitStructure.TIM_ICFilter = 0x0; 
TIM_ICInit(TIM1, &TIM_ICInitStructure); 
 
TIM_ClearITPendingBit(TIM1, TIM_IT_CC3); 
TIM_ITConfig(TIM1, TIM_IT_CC3, ENABLE); 
 
/* TIM enable counter */ 
TIM_Cmd(TIM1, ENABLE); 
 
 
/* TIMER interrupt routine: wird nie aufgerufen */void TIM1_CC_IRQHandler (void) 
{ 
  if (TIM1->SR & TIM_IT_CC3) 
  { /* capture timer */ 
      TIM1->SR = (unsignedshort)~TIM_FLAG_CC3; 
  } 
}
best regards
Hans

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