用stm32f103c8t6和超声波模块编写一段程序!

好的，这里提供一个简单的超声波测距程序，使用STM32F103C8T6和HC-SR04超声波模块，你可以参考一下：

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

#define TRIG_PIN GPIO_Pin_0
#define ECHO_PIN GPIO_Pin_1
#define TRIG_PORT GPIOA
#define ECHO_PORT GPIOA

void delay_us(uint32_t us)
{
    while (us--)
    {
        __NOP();
    }
}

void HC_SR04_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    TIM_TimeBaseInitTypeDef TIM_InitStruct;
    TIM_OCInitTypeDef TIM_OCInitStruct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

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

    GPIO_InitStruct.GPIO_Pin = ECHO_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(ECHO_PORT, &GPIO_InitStruct);

    TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_InitStruct.TIM_Prescaler = 72 - 1;
    TIM_InitStruct.TIM_Period = 0xFFFF;
    TIM_TimeBaseInit(TIM2, &TIM_InitStruct);

    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStruct.TIM_Pulse = 0;
    TIM_OC1Init(TIM2, &TIM_OCInitStruct);

    TIM_Cmd(TIM2, ENABLE);
}

uint32_t HC_SR04_GetDistance(void)
{
    uint32_t start_time, end_time;
    float distance;

    GPIO_SetBits(TRIG_PORT, TRIG_PIN);
    delay_us(10);
    GPIO_ResetBits(TRIG_PORT, TRIG_PIN);

    while (GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == RESET)
    {
        start_time = TIM_GetCounter(TIM2);
    }

    while (GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == SET)
    {
        end_time = TIM_GetCounter(TIM2);
    }

    distance = (end_time - start_time) * 0.017;
    return (uint32_t)distance;
}

int main(void)
{
    uint32_t distance;

    HC_SR04_Init();

    while (1)
    {
        distance = HC_SR04_GetDistance();
        delay_ms(500);
    }
}

这段程序使用的是TIM2定时器来计算超声波传播时间，需要先初始化TIM2定时器和超声波模块的GPIO口，然后通过发送一个10us的脉冲来触发超声波模块，等待回波信号并计算出距离。需要注意的是，这段程序中的计算距离的公式是针对超声波在空气中传播的，如果你的场景不同可能需要做出调整。