#include "stm32f10x.h"
static EXTI_InitTypeDef EXTI_InitStructure;
static GPIO_InitTypeDef GPIO_InitStructure;
static NVIC_InitTypeDef NVIC_InitStructure;
#define PB5OUT(n) *(volatile uint32_t *)(0x42000000+((uint32_t)&GPIOB->ODR-0x40000000)*32+n*4)
void led(void){
//led-->PB5
//使能端口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
//初始化GPIO引脚
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;//高速响应
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_5);
}
//中断初始化函数
void exti4_init(void)
{ //key0-->PE4
//使能（打开）端口E的硬件时钟，就是对端口E供电
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
//使能系统配置时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//配置引脚4的工作模式
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_Init(GPIOE, &GPIO_InitStructure);
//将引脚连接到外部中断,即将PE4和EXTI4连接在一起
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4);
//外部中断的配置
EXTI_InitStructure.EXTI_Line = EXTI_Line4;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising ;//检测按键按下
EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能
EXTI_Init(&EXTI_InitStructure);
//配置NVIC大总管允许外部中断引脚申请中断请求
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn; //中断请求通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; //响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void delay(void){
uint32_t i=0x2000000;
while(i--);
}
//中断服务函数
void EXTI4_IRQHandler(void){
//判断是否有中断请求
if(EXTI_GetITStatus(EXTI_Line4) == SET)
{ //灯亮
PB5OUT(5)=0;
delay();
PB5OUT(5)=1;
/* 清空标志位。告诉cpu，已经完成当前中断处理，可以响应新的中断请求
如果不清空标志位，cpu则认为当前中断处理还没有完成，继续执行中断服务函数，直到标志位清空为止
*/
EXTI_ClearITPendingBit(EXTI_Line4);
}
}
int main(){
led();
exti4_init();
while(1){
}
}发现自己进步了，哈哈哈哈哈~开心
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