这样配置有木有错？？求各位指点，初学者不太懂！
void GPIO_Configuaration(void)//定义PA0口，初始化
{
 GPIO_InitTypeDef GPIO_InitStructure;
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN;
 GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
 GPIO_Init(GPIOA,&GPIO_InitStructure);
  
}
void EXTI_Config(void)
{
 EXTI_InitTypeDef EXTI_InitStructure;
 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,GPIO_PinSource0);   
 EXTI_InitStructure.EXTI_Line=EXTI_Line0;
 EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
 EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
 EXTI_InitStructure.EXTI_LineCmd=ENABLE;
 EXTI_Init(&EXTI_InitStructure);
}
外部中断，
void NVIC_Config(void)
{
 NVIC_InitTypeDef NVIC_InitStructure;
 //NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
 NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
 NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
 NVIC_Init(&NVIC_InitStructure);
} 发生中断时，就是LED状态反转!