帮我用c语言写基于stm32f103zet6单片机的hc-sr04模块的超声波测距的代码

好的，下面是基于STM32F103ZET6单片机的HC-SR04模块的超声波测距的代码，希望对你有帮助。

#include "stm32f10x.h"
#include "delay.h"

#define TRIG GPIO_Pin_6
#define ECHO GPIO_Pin_7

void TIM3_Int_Init(u16 arr, u16 psc);
float Distance(void);

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitStructure.GPIO_Pin = TRIG;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = ECHO;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    TIM3_Int_Init(0xFFFF, 72 - 1);

    while (1) {
        float distance = Distance();
        // 根据超声波测距测得的距离做出相应的操作
        delay_ms(100);
    }
}

void TIM3_Int_Init(u16 arr, u16 psc)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

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

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

float Distance(void)
{
    float distance;
    u32 temp;

    GPIO_SetBits(GPIOB, TRIG);
    delay_us(20);
    GPIO_ResetBits(GPIOB, TRIG);

    while (!GPIO_ReadInputDataBit(GPIOB, ECHO));

    TIM_SetCounter(TIM3, 0);

    while (GPIO_ReadInputDataBit(GPIOB, ECHO));

    temp = TIM_GetCounter(TIM3);
    distance = (float)temp * 0.01715;

    return distance;
}

void TIM3_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    }
}

注：以上代码仅作参考，具体实现需要根据实际情况进行修改。