按键点灯LED灯（串口）

  

    GPIO库函数配置

        GPIO_InitTypeDef GPIO_InitStructure;//必须在最前面                                                                          RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOC, &GPIO_InitStructure);

led.h文件

#ifndef _LED_H_
#define _LED_H_

#include "sys.h"

#define LED PCout(13)

void Led_Init(void);


#endif

EXTI.h文件

#ifndef _EXTI_H_
#define _EXTI_H_

#include "sys.h"

void EXTI_KEY_Init(void);


#endif

EXTI.c文件

#include "EXTI.h"

void EXTI_KEY_Init(void)//配置PB11为下降沿触发
{
	GPIO_InitTypeDef GPIO_InitStructure;//必须在最前面
	EXTI_InitTypeDef EXTI_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;


	//配置管脚时钟和复用时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);

	//配置GPIO口为上拉式输入		
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	//配置GPIO口为外部中断模式
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource10);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource11);

	//配置EXTI中断触发模式
	EXTI_InitStructure.EXTI_Line = EXTI_Line10;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);
	
	EXTI_InitStructure.EXTI_Line = EXTI_Line11;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);
	
	
	//配置EXTI的中断优先级
	NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);

}

main主函数

#include "sys.h"
#include "EXTI.h"
#include "led.h"

int main (void)
{
	NVIC_Configuration();
	Led_Init();
	EXTI_KEY_Init();
	
	while(1)
	{
		
	}
}

void EXTI15_10_IRQHandler(void)
{
	if(EXTI_GetFlagStatus(EXTI_Line10) == 1)//判断哪一条线
	{
		LED = 0;//灯亮
		EXTI_ClearFlag(EXTI_Line10);//清除中断线
	}
	
	if(EXTI_GetFlagStatus(EXTI_Line11) == 1)
	{
		LED = 1;//灯灭
		EXTI_ClearFlag(EXTI_Line11);
	}
	
}