用c语言写一个stm32定时器中断实现蜂鸣器报警的代码

好的，这是一个简单的用C语言编写STM32定时器中断实现蜂鸣器报警的代码示例：

#include "stm32f10x.h"

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        GPIO_WriteBit(GPIOA, GPIO_Pin_8, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_8)));
    }
}

void init_TIM2(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    
    TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1;
    TIM_TimeBaseInitStructure.TIM_Period = 500 - 1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
    
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    init_TIM2();
    
    TIM_Cmd(TIM2, ENABLE);
    
    while(1);
}

在本例中，我们使用STM32F10x系列的芯片，并使用了TIM2定时器。蜂鸣器连接到PA8引脚，我们使用TIM2定时器中断来实现蜂鸣器的报警功能。当定时器中断被触发时，我们在PA8引脚上切换输出状态以产生蜂鸣声。