STM32实战篇：按键（外部输入信号）触发中断

功能要求

将两个按键分别与引脚PA0、PA1相连接，通过按键按下，能够触发中断响应程序（不需明确功能）。

代码流程如下：

实现代码

cpp 复制代码

#include "stm32f10x.h"                  // Device header

int main()
{
	//开启时钟：GPIO、AFIO
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	//配置GPIO初始化
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;
	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_2MHz;
	GPIO_InitStruct.GPIO_Mode= GPIO_Mode_IPU;
	
	GPIO_Init(GPIOA, &GPIO_InitStruct);
	
	//设置EXTI引脚映射
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1);
	
	//EXTI0通道初始化
	EXTI_InitTypeDef EXTI_InitStruct0;
	EXTI_InitStruct0.EXTI_Line=EXTI_Line0;
	EXTI_InitStruct0.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStruct0.EXTI_Trigger=EXTI_Trigger_Rising;
	EXTI_InitStruct0.EXTI_LineCmd=ENABLE;
	
	EXTI_Init(&EXTI_InitStruct0);
	
	//EXTI1通道初始化
	EXTI_InitTypeDef EXTI_InitStruct1;
	EXTI_InitStruct1.EXTI_Line=EXTI_Line1;
	EXTI_InitStruct1.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStruct1.EXTI_Trigger=EXTI_Trigger_Rising;
	EXTI_InitStruct1.EXTI_LineCmd=ENABLE;
	
	EXTI_Init(&EXTI_InitStruct1);
	
	//NVIC配置
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	//EXTI0
	NVIC_InitTypeDef NVIC_InitStruct0;
	NVIC_InitStruct0.NVIC_IRQChannel=EXTI0_IRQn;
	NVIC_InitStruct0.NVIC_IRQChannelPreemptionPriority=0;
	NVIC_InitStruct0.NVIC_IRQChannelSubPriority=0;
	NVIC_InitStruct0.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStruct0);
	//EXTI1
	NVIC_InitTypeDef NVIC_InitStruct1;
	NVIC_InitStruct1.NVIC_IRQChannel=EXTI1_IRQn;
	NVIC_InitStruct1.NVIC_IRQChannelPreemptionPriority=0;
	NVIC_InitStruct1.NVIC_IRQChannelSubPriority=0;
	NVIC_InitStruct1.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStruct1);
	
	while(1)
	{
	}
}

void EXTI0_IRQHandler()
{
	EXTI_ClearITPendingBit(EXTI_Line0);//清除标志位
	//需要执行的功能
}

void EXTI1_IRQHandler()
{
	EXTI_ClearITPendingBit(EXTI_Line1);//清除标志位
	//需要执行的功能
}