我是菜鸟啊，连51都没搞过，因为公司用的这个U，直接学习这个的。不过这个问题后来好了，也不知为什么
#include "lyd.h"

//外部中断9-5服务程序
void EXTI9_5_IRQHandler(void)
{
delay_ms(20); //消抖
if(PGin(7)==1)  
{
printf("IF11有输入: "); 
PBout(15)=!PBout(15);
}
EXTI_ClearITPendingBit(EXTI_Line7); 
}


//set G7-F11上升沿触发
void EXTIX_Init(void)
{
NVIC_InitTypeDef   NVIC_InitStructure;
EXTI_InitTypeDef   EXTI_InitStructure;

// KEY_Init(); //按键对应的IO口初始化
 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟

 
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOG, EXTI_PinSource7);  //G7-F11


  /* 配置EXTI_Line0 */
  EXTI_InitStructure.EXTI_Line = EXTI_Line7;//LINE0
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发 
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能LINE0
  EXTI_Init(&EXTI_InitStructure);//配置

/* cfg IRQ */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//外部中断0
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子优先级2
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
  NVIC_Init(&NVIC_InitStructure);//配置
 
}