帮我写一个用stm32接收HC-SR04超声波模块的数据的代码

以下是一个使用STM32接收HC-SR04超声波模块数据的示例代码：

#include "stm32f10x.h"

#define TRIG_PIN GPIO_Pin_8
#define TRIG_PORT GPIOA
#define ECHO_PIN GPIO_Pin_0
#define ECHO_PORT GPIOB

void TIM3_IRQHandler(void)
{
    static uint32_t start_time = 0;
    static uint32_t end_time = 0;
    static uint8_t capture_done = 0;
    static uint32_t distance = 0;

    if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
    {
        if (!capture_done)
        {
            start_time = TIM_GetCapture1(TIM3);
            capture_done = 1;
            TIM_SetCounter(TIM3, 0);
        }
        else
        {
            end_time = TIM_GetCapture1(TIM3);
            capture_done = 0;
            distance = (end_time - start_time) / 58;
        }
        TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
    }
}

void HC_SR04_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_ICInitTypeDef TIM_ICInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = TRIG_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(TRIG_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = ECHO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(ECHO_PORT, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 65535;
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0;
    TIM_ICInit(TIM3, &TIM_ICInitStructure);

    TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

int main(void)
{
    HC_SR04_Init();

    while (1)
    {
        GPIO_SetBits(TRIG_PORT, TRIG_PIN);
        Delay(10);
        GPIO_ResetBits(TRIG_PORT, TRIG_PIN);
        Delay(100);
        printf("Distance: %d cm\n", distance);
    }
}

其中，`HC_SR04_Init()`函数用于初始化GPIO和TIM3，使其能够与HC-SR04超声波模块通信。`TIM3_IRQHandler()`函数用于捕获TIM3的输入捕获事件，并计算出超声波的传播时间和距离。在主函数中，通过向TRIG引脚发送一个10us的高电平来触发超声波发射，然后等待100ms后读取距离数据。可以根据实际需要调整发射和等待时间。