/* Includes */
#include "stm32f4xx.h"
#include "test.h"

int main( void ) {
    test_init ();
    EXTI_GenerateSWInterrupt(EXTI_Line3);
    while(1) {
;
    }
}

#ifndef H_TEST
#define H_TEST

#include "stm32f4xx_exti.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_syscfg.h"


void test_init(void);

#endif

#include "test.h"
#include "stm32f4xx_syscfg.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_exti.h"

EXTI_InitTypeDef EXTI_InitStructure;

void test_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* Enable GPIOG clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG, 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_3;
GPIO_Init(GPIOG, &GPIO_InitStructure);

/* Connect EXTI Line3 to PG3 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOG, EXTI_PinSource3);

/* Configure EXTI Line3 */
EXTI_InitStructure.EXTI_Line = EXTI_Line3;
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 EXTI Line3 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void EXTI3_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line3) != RESET)
{
/* Clear the EXTI line 3 pending bit */
EXTI_ClearITPendingBit(EXTI_Line3);
}
}