Ext_Interrupt.c

#include "stm32f4xx_exti.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "misc.h"
#include "stm32f4xx_syscfg.h"
/* Configure pins to be interrupts */
void Configure_PD0(void) {
    /* Set variables used */
    GPIO_InitTypeDef GPIO_InitStruct;
    EXTI_InitTypeDef EXTI_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    /* Enable clock for GPIOD */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    /* Enable clock for SYSCFG */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    /* Set pin as input */
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOD, &GPIO_InitStruct);

    /* Tell system that you will use PD0 for EXTI_Line0 */
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource0);

    /* PD0 is connected to EXTI_Line0 */
    EXTI_InitStruct.EXTI_Line = EXTI_Line0;
    /* Enable interrupt */
    EXTI_InitStruct.EXTI_LineCmd = ENABLE;
    /* Interrupt mode */
    EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
    /* Triggers on rising and falling edge */
    EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    /* Add to EXTI */
    EXTI_Init(&EXTI_InitStruct);

    /* Add IRQ vector to NVIC */
    /* PD0 is connected to EXTI_Line0, which has EXTI0_IRQn vector */
    NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
    /* Set priority */
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
    /* Set sub priority */
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
    /* Enable interrupt */
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    /* Add to NVIC */
    NVIC_Init(&NVIC_InitStruct);
}



/* Set interrupt handlers */
/* Handle PD0 interrupt */
void EXTI0_IRQHandler(void) {
    /* Make sure that interrupt flag is set */
    if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
        /* Do your stuff when PD0 is changed */


        /* Clear interrupt flag */
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}


int main(void) {
    /* System init */
    SystemInit();
    /* Configure PD0 as interrupt */
    Configure_PD0();

    while (1) {

    }
}