STM32F407ZGT6双击按键控制蜂鸣器发声

在STM32F407ZGT6上双击按键控制蜂鸣器发声，需要进行以下步骤：

1. 配置GPIO口，使其连接到按键和蜂鸣器。
2. 配置定时器，用于产生蜂鸣器的PWM波。
3. 配置中断，检测按键的状态变化。
4. 在中断处理函数中判断按键状态，如果是双击，则控制蜂鸣器发声。

下面是一个简单的示例代码：

#include "stm32f4xx.h"

#define BEEP_PIN GPIO_Pin_8
#define BEEP_PORT GPIOA
#define KEY_PIN GPIO_Pin_0
#define KEY_PORT GPIOE

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOE, ENABLE);

    GPIO_InitStructure.GPIO_Pin = BEEP_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(BEEP_PORT, &GPIO_InitStructure);

    GPIO_PinAFConfig(BEEP_PORT, GPIO_PinSource8, GPIO_AF_TIM1);

    GPIO_InitStructure.GPIO_Pin = KEY_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(KEY_PORT, &GPIO_InitStructure);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 168 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

    TIM_Cmd(TIM1, ENABLE);
}

void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

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

    while (1)
    {
    }
}

void EXTI0_IRQHandler(void)
{
    static uint32_t last_time = 0;
    uint32_t current_time = 0;

    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line0);

        current_time = TIM_GetCounter(TIM2);

        if ((current_time - last_time) < 50)
        {
            TIM_SetCompare1(TIM1, 500);
        }
        else
        {
            TIM_SetCompare1(TIM1, 0);
        }

        last_time = current_time;
    }
}

该代码使用TIM1产生1000Hz的PWM波，连接到PA8口的蜂鸣器。同时，使用EXTI0检测PE0口的按键，并在中断处理函数中判断按键状态，如果是双击，则设置PWM波的占空比为50%使蜂鸣器响起。