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按键模块主要是注意短按、长按；

引脚状况

使用PA0、PB0、 PB1、PB2四个引脚；根据电路图可知：按下端口接地，所以我们要将端口设置成为上拉模式，只要按下即低电平；

STM32CubeMX

端口配置

 配置定时器TIM6

因为单纯计数我便使用最基础的定时器

 

 使能

代码部分

按键扫描有多种方法，我只用一种定时器扫描，在精不在多； 

记住回调函数在哪找，就不用背它；

头文件

#ifndef  _INTERRUPT_H_
#define  _INTERRUPT_H_
#include "stm32g4xx_hal.h"
#include "stdbool.h"
#include "stdint.h"
#include "main.h"struct key
{bool key_status;//按键状态uint8_t counts;//按键计数bool shortsign;//短按uint8_t key_time;//按键时长bool longsign;//长按
};
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim);
#endif

 c文件部分

#include "interrupt.h"
#include "led.h"
#include "stdbool.h"struct key key1[4]={0,0,0,0,0};void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM6){key1[0].key_status = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0);key1[1].key_status = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1);key1[2].key_status = HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2);key1[3].key_status = HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0);for(uint8_t i=0;i<4;i++){switch(key1[i].counts){case 0:{if(key1[i].key_status == 0)key1[i].counts =1;}break;case 1:   使用case1消抖{if(key1[i].key_status ==0){key1[i].counts =2;key1[i].key_time =0;}else key1[i].counts =0;}break;case 2:   {if(key1[i].key_status== 0){key1[i].key_time++;}if(key1[i].key_status== 1){key1[i].shortsign=1;key1[i].counts =0;}if(key1[i].key_status== 1 && key1[i].key_time > 70){key1[i].longsign=1;key1[i].counts =0;}}break;}}}}

main文件

#include "interrupt.h"
extern struct key key1[];
int main(void)
{HAL_TIM_Base_Start_IT(&htim6);
while (1){ HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);char text[30];sprintf(text,"   no dwon");LCD_DisplayStringLine(Line4,(uint8_t *)text);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */if(key1[0].shortsign==1){sprintf(text,"   0  dwon");LCD_DisplayStringLine(Line5 ,(uint8_t *)text);key1[0].shortsign = 0;}if(key1[0].longsign ==1){sprintf(text,"   1  dwon");LCD_DisplayStringLine(Line5 ,(uint8_t *)text);key1[0].longsign = 0;}}
}