Configuring a pin as interrupt ARM Cortex M3 STM32F1xx - arm

Question

I'm trying to configure Pin PD3 as external interrupt, here is my configuration, but it seems its not working. So I defined everything and configured it, I still can't get the interrupt working in falling or rising edge.
void Configure_PD3(void) {
GPIO_InitTypeDef GPIO_InitStruct;
/* GPIO Ports Clock Enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOD,ENABLE); // enables clock to portD
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_10MHz;
/*Configure GPIO pin : PD3 */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStruct);
/* PD3 is connected to EXTI_Line3 */
EXTI_InitStruct.EXTI_Line = EXTI_Line3;
/* 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);
/* EXTI interrupt init*/
NVIC_SetPriority(EXTI3_IRQn, 0);
NVIC_EnableIRQ(EXTI3_IRQn);
}
void EXTI3_IRQHandler(void)
{
int i = 0;
}
void main() {
// Don't put any variables on the stack here, as FreeRTOS seems to reuse this space.
// This might be valid as this thread will be dead after vTaskStartScheduler().
hardware_init();
Co
nfigure_PD3();
}