STM32 EXTI auf Pin B12

  GPIO_InitTypeDef GPIO_InitStructure;

  EXTI_InitTypeDef EXTI_InitStructure;

  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the BUTTON Clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);

  /* Configure Button pin as input floating */

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_12;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

    /* Connect Button EXTI Line to Button GPIO Pin */

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource12);

    /* Configure Button EXTI line */

    EXTI_InitStructure.EXTI_Line = EXTI_Line12;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_Init(&EXTI_InitStructure);

    /* Enable and set Button EXTI Interrupt to the lowest priority */

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

void EXTI0_IRQHandler(void)

{

    /* Toggle LED3 */

     STM32vldiscovery_LEDToggle(LED3);

    /* Clear the User Button EXTI line pending bit */

    EXTI_ClearITPendingBit(EXTI_Line1);

}