STM32按键扫描/按键中断/外部中断资料下载

MCU：STM32F334C81.扫描模式首先配置按键引脚为上拉输入模式，根据原理图按键接PA0，按键没有按下的时候引脚输入为低电平0，按键按下输入高电平1，松开又回到低电平0然后在死循环中不断读取相应引脚的输入状态，并根据返回结果判断按键是否按下，做出相应处理下面的代码完成的功能是：按键第一次按下，点亮灯，再按一次，熄灭，重复。#include "Userkey.h"u8 flag=0;void key_GPIO_Config(void){GPIO_InitTypeDef GPIO_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);}void key_scanmode(void){key_GPIO_Config();while(1){if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)){flag =~flag;if(flag)//第1?3?5，，次按下{GPIO_SetBits(GPIOB, GPIO_Pin_6);}else//第2?4?6，，，次按下{GPIO_ResetBits(GPIOB, GPIO_Pin_6);}}}}2.中断模式第一步和上面相同，将接按键的引脚配置为上拉输入，然后配置相应中断，PA0对应外部中断0功能：按键按下，点亮LED并向串口发送按键按下到PC，按键松开，关掉LED并发送按键松开void key_interruptmode(void){EXTI_InitTypeDef EXTI_InitStructure;NVIC_InitTypeDef NVIC_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);key_GPIO_Config();NVIC_InitStruct.NVIC_IRQChannel =EXTI0_IRQn;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStruct);SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);EXTI_ClearITPendingBit(EXTI_Line0);EXTI_InitStructure.EXTI_Line=EXTI_Line0;EXTI_InitStructure.EXTI_LineCmd =ENABLE;EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising_Falling;EXTI_Init(&EXTI_InitStructure);}void EXTI0_IRQHandler(void){if(EXTI_GetITStatus(EXTI_Line0)){if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0))//按键按下{GPIO_SetBits(GPIOB, GPIO_Pin_6);printf("按键按下\n");//串口打印状态}else//按键松开{GPIO_ResetBits(GPIOB, GPIO_Pin_6);printf("按键松开\n");}}EXTI_ClearITPendingBit(EXTI_Line0);}注：如果要实现和1一样的功能，将EXTI_Trigger改为上升沿或者下降沿，再改一下中断处理函数即可STM32按键扫描按键中断外部中断(mbbeetchina)