Introduction - If you have any usage issues, please Google them yourself
void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure
EXTI_ClearITPendingBit(EXTI_Line8)
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource8)
EXTI_InitStructure.EXTI_Line EXTI_Line8
EXTI_InitStructure.EXTI_Mode EXTI_Mode_Interrupt
EXTI_InitStructure.EXTI_Trigger EXTI_Trigger_Falling
EXTI_InitStructure.EXTI_LineCmd ENABLE
EXTI_Init(&EXTI_InitStructure)
}