为什么stm32f407按键中断不行？

wkkkk · 发表于 2021-10-21 21:14:09

#include "stm32f4xx.h"
#include "sys.h"

static  GPIO_InitTypeDef GPIO_InitStructure;//定义一个GPIO初始化的结构体
static  EXTI_InitTypeDef EXTI_InitStructure;//定义一个中断初始化的结构体
static  NVIC_InitTypeDef NVIC_InitStructure;//定义一个中断优先级初始化的结构体

void delay(void)
{
uint32_t i=0x1000000;

while(i--);

}

void exti8_Init(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能硬件时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能系统时钟

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//PB8 KEY1按键初始化
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//将PB8连接到外部中断8
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource8);

//配置外部中断8
EXTI_InitStructure.EXTI_Line = EXTI_Line8;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

//配置中断优先级
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//打开外部中断1的请求通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

void exti9_Init(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能硬件时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能系统时钟

//配置PB9引脚为输入模式 KEY0按键初始化
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//将PB9连接到外部中断9
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource9);

//配置外部中断9
EXTI_InitStructure.EXTI_Line = EXTI_Line9;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

//配置中断优先级
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//外部中断9的请求通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

int main(void)
{
//使能端口F的时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;//选择端口F的9号和10引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//输出模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//选择推挽输出，增大输出电流
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//高速响应
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//无上下拉电阻；当有负载时不需要上下拉电阻，反之需要，以保证静电流向大地，不会损坏IO引脚
GPIO_Init(GPIOF, &GPIO_InitStructure);//初始化端口F

PFout(9)=1;
PFout(10)=1;

//中断优先级组的配置：选择第二组
//支持四个抢断优先级和四个响应优先级
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
exti9_Init();
exti8_Init();

while(1)
{

   }

}

void EXTI9_IRQHandler(void)    //中断服务函数
{
if(EXTI_GetITStatus(EXTI_Line9)== SET)//判断是否有中断请求
{
PFout(9)=0;//打开LED0
delay();

PFout(9)=1;//关闭LED0
delay();

/* 清空外部中断9的标志位 */
EXTI_ClearITPendingBit(EXTI_Line9);
}
}

void EXTI8_IRQHandler(void)    //中断服务函数
{
if(EXTI_GetITStatus(EXTI_Line8)== SET)//判断是否有中断请求
{
PFout(10)=0;//打开LED1
delay();

PFout(10)=1;//关闭LED1
delay();

/* 清空外部中断8的标志位 */
EXTI_ClearITPendingBit(EXTI_Line8);
}
}