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Input capture STM32F429 Discovery

Question asked by Mancini.Michele on Feb 21, 2014
Latest reply on Feb 21, 2014 by Mancini.Michele
Hi,
I have a problem with F429 Discovery board.
I use PB4 (is a free pin) for input capture
This the configuration:

void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;
     
  /* TIM3 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
 
  /* GPIOB clock enable */
  RCC_AHB1PeriphResetCmd (RCC_AHB1Periph_GPIOB, ENABLE);
   
  /* TIM3 chennel1 configuration : PB.04 */
  GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_4;
  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_UP ;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
   
  /* Connect TIM pin to AF4 */
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_TIM3);
 
  /* Enable the TIM3 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_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_1;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;
 
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
 
  /* TIM enable counter */
  TIM_Cmd(TIM3, ENABLE);
 
  /* Enable the CC1 Interrupt Request */
  TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
  
}
 
 
 
 
__IO uint16_t IC2Value = 0;
 
void TIM3_IRQHandler(void)
{
  /* Clear TIM3 Capture compare interrupt pending bit */
  TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
 
  /* Get the Input Capture value */
  IC2Value = TIM_GetCapture1(TIM3);
}

When I toggle the PB4, never happen
Why?

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