AnsweredAssumed Answered

trying to understand EXTI example code

Question asked by belomutskiy.andrey on Sep 20, 2012
Latest reply on Mar 26, 2015 by Beck.Karl_Michael
I have EXTI example running on my stm32f4 board but I am having trouble changing the PIN which causes the interrupt.

Here is the initialization method:
void EXTILine0_Config(void)
  GPIO_InitTypeDef   GPIO_InitStructure;
  NVIC_InitTypeDef   NVIC_InitStructure;

  /* Enable GPIOA clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  /* Configure PA0 pin as input floating */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Connect EXTI Line0 to PA0 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

  /* Configure EXTI Line0 */
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;

  /* Enable and set EXTI Line0 Interrupt to the lowest priority */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

I am trying to change the replace GPIO_Pin_0 in "GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;" but still - my led is controlled via the same user button, and via applying +3 to PA0, not any other PA pin. I have even tried changing EXTI_PinSource0 - same thing, only PA0 causes the interrupt. I have double checked that I am in fact rebuilding and reflashing a couple of times - I can easily change which LED I control with the EXTI, this confirm that I am in fact do execute the new binary.

What am I missing here?