代码收藏家 STM32 HAL库 按键中断实现单击/双击/长按（无阻塞）
STM32 HAL库 按键中断实现单击/双击/长按（无阻塞）
理论可以实现无限击，但没有使用场景。
理论可以实现无限按钮，当前仅一个。只需为按钮结构体加入编号，在处理函数中轮询即可。
准备
首先配置一个1ms定时器中断，也可以比1ms长或者短，该时长即是后面双击等待时间、长按时间、消抖时间的单位。
配置好按键GPIO，配置双边沿触发中断。
代码
复制button.c、button.h进入工程src、inc目录，并导入工程。
/****************** button.c ******************/
# include "button.h"
// 状态机逻辑，按键中断处理
void BUTTON_EXTI_Callback(uint16_t GPIO_Pin,BUT* but)
{
if(GPIO_Pin == but_Pin)
{
if(HAL_GPIO_ReadPin(but_GPIO_Port,but_Pin) == GPIO_PIN_RESET)
{
if((but->but_state & 0x01) == 0x00)
{
HAL_TIM_Base_Start_IT(but->tim);
but->but_time = 0;
but->but_state |= 0x05;
}
if((but->but_state & 0x1C) == 0x18)
{
but->but_state |= 0x04;
}
}
else
{
if(((but->but_state & 0x18) == 0x18) && (but->wait_time < but->tap2_time))
{
but->but_state |= 0x80;
}
}
}
}
// 状态机逻辑，定时器处理
void BUTTON_TIM_PeriodCallback(TIM_HandleTypeDef* htim,BUT* but)
{
if(htim == but->tim)
{
if((but->but_state & 0x04) == 0x04)
{
++but->but_time;
if(but->but_time >= but->debounce_time)
{
if(HAL_GPIO_ReadPin(but->BUT_GPIO_Port,but->BUT_Pin) == GPIO_PIN_RESET)
{
if((but->but_state & 0x10) == 0x10)
{
but->but_state |= 0x30;
but->but_state = 0x00;
but->KEY = 2;
}
else
{
but->wait_time = 0;
but->but_state = 0x19;
}
}
else
{
but->wait_time = 0;
but->but_state &= (!0x04);
}
}
}
if((but->but_state & 0x88) == 0x88)
{
++but->wait_time;
if(but->wait_time >= but->tap2_time)
{
but->KEY = 1;
but->but_state = 0x00;
}
}
else if((but->but_state & 0x88) == 0x08)
{
++but->wait_time;
if(but->wait_time >= but->longpress_time)
{
but->KEY = 3;
but->but_state = 0x00;
}
}
}
}/****************** button.h ******************/
#ifndef __BUTTON_H
#define __BUTTON_H
#include "main.h"
// 结构体定义
typedef struct but_struct
{
// state BIT0：按下 BIT1:松开 BIT2:消抖 BIT3:等待
// BIT4:点按一次 BIT5:点按两次 BIT6 等待双击/等待长按
volatile uint8_t but_state;
uint16_t but_time; //消抖计数器
uint16_t wait_time; //等待计数器
uint16_t debounce_time; //消抖时间（ms）
uint16_t tap2_time; //最长双击时间（ms）
uint16_t longpress_time; //最短长按时间（ms）
uint8_t KEY; //更新按键状态 0：无 1：单击 2：双击 3：长按
GPIO_TypeDef* BUT_GPIO_Port; //按键GPIOPORT
uint16_t BUT_Pin; //按键GPIOPin
TIM_HandleTypeDef* tim; //按键事件处理定时器
}BUT;
void BUTTON_EXTI_Callback(uint16_t GPIO_Pin,BUT* but0);
void BUTTON_TIM_PeriodCallback(TIM_HandleTypeDef* htim,BUT* but0);
#endif在主函数中include并定义结构体；
将BUTTON_EXTI_Callback(uint16_t GPIO_Pin,BUT* but0) 和 BUTTON_TIM_PeriodCallback(TIM_HandleTypeDef* htim,BUT* but0)两函数分别放入中断处理函数中，即可通过结构体中的KEY成员读取到按键状态，完成按键检测。
下为OLED显示按键状态的案例。使用F103c8t6作为主控
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "i2c.h"
#include "tim.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "oled.h"
#include "stdlib.h"
#include "stdio.h"
#include "math.h"
#include "button.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
BUT but = {
.but_state = 0x00,
.but_time = 0,
.wait_time = 0,
.BUT_GPIO_Port = but_GPIO_Port,
.BUT_Pin = but_Pin,
.debounce_time = 10,
.longpress_time = 1000,
.tap2_time = 500,
.KEY = 0,
.tim = &htim2,
};
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_I2C1_Init();
MX_TIM4_Init();
MX_TIM2_Init();
/* USER CODE BEGIN 2 */
OLED_Init(); //OLED初始
OLED_Clear(); //清屏
OLED_ShowString(0,0,"KEY State:",16, 0); //反相显示8X16字符串
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if(but.KEY == 1)
OLED_ShowString(32,2,"TAP ONCE ",12,0);//正相显示6X8字符串
if(but.KEY == 2)
OLED_ShowString(32,2,"TAP TWICE ",12,0);//正相显示6X8字符串
if(but.KEY == 3)
OLED_ShowString(32,2,"LONG PRESS",12,0);//正相显示6X8字符串
HAL_Delay(100);
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
BUTTON_EXTI_Callback(GPIO_Pin,&but);
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
BUTTON_TIM_PeriodCallback(htim,&but);
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
效果如上
作者：F11sh
