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：

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实现代码

#include "stm32f10x.h"                  // Device headerint main()
{//开启时钟：GPIO、AFIORCC_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);//EXTI0NVIC_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);//EXTI1NVIC_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
}