TEST/TEST_Prj/RS232两路通信程序/Demo/HARDWARE/EXTI/exti.c

#include "exti.h"

#include "delay.h"


void exti_Init(void)
{
	 EXTI_InitTypeDef EXTI_InitStruct;
	 NVIC_InitTypeDef NVIC_InitStruct;
	 GPIO_InitTypeDef GPIO_InitStructure;
//   KEY_Init();//IO初始化
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//配置外部中断时钟
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);//使能GPIOB时钟

	GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_7|GPIO_Pin_9;//
	//GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
 	GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOB7
	 //io口与中断线映射 
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource7);//链接到中断线7  GPIO7只能映射到中断线4上面
	EXTI_InitStruct.EXTI_Line=EXTI_Line7;//确定中断线
	EXTI_InitStruct.EXTI_LineCmd=ENABLE;//使能
	EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;//中断模式
	EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Falling;//xia降沿触发
	EXTI_Init(&EXTI_InitStruct);//初始化 

	
	//io口与中断线映射 
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource9);//链接到中断线9 
	EXTI_InitStruct.EXTI_Line=EXTI_Line9;//确定中断线
	EXTI_InitStruct.EXTI_LineCmd=ENABLE;//使能
	EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;//中断模式
	EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Falling;//xia降沿触发
	EXTI_Init(&EXTI_InitStruct);//初始化 
	
	
	NVIC_InitStruct.NVIC_IRQChannel=EXTI9_5_IRQn;
/*
需要明确的是，PxN管脚共用外部中断线EXTIN和外部中断向量EXTIN_IRQn
和中断服务程序入口EXTIN_IRQHandler，但是需要注意的是[9...5]
共用EXTI9_5_IRQn和EXTI9_5_IRQHandler、[15...10]共用EXTI15_10_IRQn和EXTI15_10_IRQHandler
*/
	NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;//使能
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;//中断抢优先级
	NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;
	NVIC_Init(&NVIC_InitStruct);//初始化
}

void EXTI9_5_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line7)!=RESET) //PB7外部中断
	{

		 
   EXTI_ClearITPendingBit(EXTI_Line7);//清除中断 标志
 }else if(EXTI_GetITStatus(EXTI_Line9)!=RESET)
	{

		}
	  EXTI_ClearITPendingBit(EXTI_Line9);//清除中断 标志
	}