stm32f407按键控制led闪烁频率和蜂鸣器声音大小

以下是基于STM32F407的按键控制LED闪烁频率和蜂鸣器声音大小的示例代码：

#include "stm32f4xx.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOD
#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA
#define BUZZER_PIN GPIO_Pin_8
#define BUZZER_PORT GPIOC

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    uint16_t prescalerValue = 0;
    uint32_t buttonState = 0;
    uint32_t lastButtonState = 0;
    uint32_t buttonPressed = 0;
    uint32_t buttonReleased = 0;
    uint32_t ledState = 0;
    uint32_t buzzerState = 0;
    uint32_t buzzerPeriod = 0;
    uint32_t buzzerDutyCycle = 0;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = BUZZER_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(BUZZER_PORT, &GPIO_InitStructure);
    GPIO_PinAFConfig(BUZZER_PORT, GPIO_PinSource8, GPIO_AF_TIM3);

    prescalerValue = (uint16_t)((SystemCoreClock / 2) / 1000000) - 1;
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = prescalerValue;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &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(TIM2, &TIM_OCInitStructure);

    TIM_Cmd(TIM2, ENABLE);

    while (1)
    {
        buttonState = GPIO_ReadInputDataBit(BUTTON_PORT, BUTTON_PIN);

        if (buttonState != lastButtonState)
        {
            if (buttonState == 0)
            {
                buttonPressed = 1;
            }
            else
            {
                buttonReleased = 1;
            }
        }

        lastButtonState = buttonState;

        if (buttonPressed)
        {
            ledState = !ledState;
            GPIO_WriteBit(LED_PORT, LED_PIN, ledState);
            buttonPressed = 0;
        }

        if (buttonReleased)
        {
            buzzerState = !buzzerState;

            if (buzzerState)
            {
                buzzerPeriod = 1000;
                buzzerDutyCycle = 500;
            }
            else
            {
                buzzerPeriod = 0;
                buzzerDutyCycle = 0;
            }

            TIM_TimeBaseStructure.TIM_Period = buzzerPeriod - 1;
            TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

            TIM_OCInitStructure.TIM_Pulse = buzzerDutyCycle - 1;
            TIM_OC1Init(TIM3, &TIM_OCInitStructure);

            TIM_Cmd(TIM3, ENABLE);

            buttonReleased = 0;
        }
    }
}

该代码使用TIM2定时器控制LED的闪烁频率，并使用TIM3定时器控制蜂鸣器的声音大小。按下按键时，LED状态会切换，并通过蜂鸣器发出嘀嗒声。松开按键时，蜂鸣器会停止发声。

请注意，这只是一个示例代码，您需要根据您的具体应用程序进行修改。