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STM32F0 EXTI not triggering

Question asked by blesener.daniel on Nov 24, 2014
Latest reply on Nov 24, 2014 by blesener.daniel
Code is very simple. I have checked it again and again but cannot get the interrupt to trigger. The interrupt does trigger if I use the software interrupt command. Anybody see the bug? I am outputting a 150Hz 3.3V square wave into the port. No grounding issues. I have verified on a scope.

void EXTI0_Config(void)
{
    EXTI_InitTypeDef   EXTI_InitStructure;
    NVIC_InitTypeDef   NVIC_InitStructure;
    GPIO_InitTypeDef   GPIO_InitStructure;
  /* Enable GPIOA clock */
  RCC_APB2PeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
 
  /* Configure PA.00 pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  /* Enable AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);


  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource11);
 
  /* Configure EXTI0 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; // or Falling if button shorts to ground
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
 
  /* Enable and set EXTI0 Interrupt to the lowest priority */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}




void EXTI0_1_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line0) != RESET)
  {
    count1++;
  
    opt_angle = 3600*(count1 + count2)/1024;
    /* Clear the EXTI line 0 pending bit */
    EXTI_ClearITPendingBit(EXTI_Line0);
  }


  if(EXTI_GetITStatus(EXTI_Line1) != RESET)
  {
    count2++;
    opt_angle = 3600*(count1 + count2)/1024;
  
    if(opt_angle >= 3600){
        count1 = 0;
        count2 = 0;
        opt_angle = 0;
    }
    /* Clear the EXTI line 0 pending bit */
    EXTI_ClearITPendingBit(EXTI_Line1);
  }
}

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