stm32实现双击功能

双击功能可以通过定时器和中断实现，具体实现步骤如下：

1. 配置GPIO口为输入模式，接受外部信号。

2. 配置定时器，设置定时时间。

3. 开启定时器中断。

4. 在定时器中断服务函数中判断GPIO口的状态，如果状态为高电平，则表示第一次点击，记录下当前时间；如果状态为低电平，则表示第二次点击，判断当前时间与第一次点击的时间差是否在双击时间范围内，如果是，则表示双击事件发生。

代码示例：

#include "stm32f10x.h"

#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA

#define TIMER_PERIOD 1000 // 1s
#define DOUBLE_CLICK_TIME 500 // 500ms

volatile uint32_t button_pressed_time = 0;

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = TIMER_PERIOD - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2, ENABLE);
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        if (GPIO_ReadInputDataBit(BUTTON_PORT, BUTTON_PIN) == GPIO_PinSet)
        {
            button_pressed_time = TIM_GetCounter(TIM2);
        }
        else
        {
            if (TIM_GetCounter(TIM2) - button_pressed_time <= DOUBLE_CLICK_TIME)
            {
                // double click event
            }
        }

        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    }
}

int main(void)
{
    GPIO_Configuration();
    TIM_Configuration();

    while (1)
    {
        // do other things
    }
}