stm32f103rct6超声波代码生成

以下是一个基于STM32F103RCT6的超声波测距代码生成的示例，你可以根据自己的需求进行修改和优化。

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "misc.h"

#define TRIG_PIN GPIO_Pin_6
#define ECHO_PIN GPIO_Pin_7
#define TRIG_PORT GPIOA
#define ECHO_PORT GPIOA

#define TIM_PERIOD 0xFFFF // Timer 2 计数器周期

void delay_us(uint32_t nus)
{
    uint32_t ticks;
    ticks = (SystemCoreClock / 1000000) * nus;
    while(ticks--);
}

void TIM2_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
        GPIO_ResetBits(TRIG_PORT, TRIG_PIN); // 将 Trig 引脚拉低
    }
}

float GetDistance(void)
{
    uint32_t time_start, time_end;
    float distance;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_OCInitTypeDef TIM_OCInitStruct;

    // 初始化 TIM2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitStruct.TIM_Period = TIM_PERIOD;
    TIM_TimeBaseInitStruct.TIM_Prescaler = (SystemCoreClock / 1000000) - 1;
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

    // 初始化 TIM2 Channel1 用于发送超声波
    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_Pulse = 10; // 10us 高电平
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStruct);

    // 初始化 GPIOA6 和 GPIOA7
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, 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_IN_FLOATING;
    GPIO_Init(ECHO_PORT, &GPIO_InitStructure);

    // 发送超声波
    GPIO_SetBits(TRIG_PORT, TRIG_PIN);
    delay_us(10);
    GPIO_ResetBits(TRIG_PORT, TRIG_PIN);

    // 等待 Echo 引脚变高
    while(GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == RESET);
    // 记录 Echo 引脚变高时的计数值
    TIM_Cmd(TIM2, ENABLE);
    while(GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) != RESET);
    TIM_Cmd(TIM2, DISABLE);
    time_start = TIM_GetCounter(TIM2);

    // 等待 Echo 引脚变低
    while(GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) != RESET);
    // 记录 Echo 引脚变低时的计数值
    TIM_Cmd(TIM2, ENABLE);
    while(GPIO_ReadInputDataBit(ECHO_PORT, ECHO_PIN) == RESET);
    TIM_Cmd(TIM2, DISABLE);
    time_end = TIM_GetCounter(TIM2);

    // 计算距离
    distance = (float)(time_end - time_start) * 0.017; // 声速为 340m/s，距离 = 时间 * 声速 / 2

    // 关闭 TIM2 和 GPIOA6
    TIM_Cmd(TIM2, DISABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, DISABLE);
    GPIO_ResetBits(TRIG_PORT, TRIG_PIN);
    GPIO_InitStructure.GPIO_Pin = TRIG_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(TRIG_PORT, &GPIO_InitStructure);

    return distance;
}

在主函数中，你可以通过调用 `GetDistance()` 函数来获取超声波测距的距离值。例如：

int main(void)
{
    float distance;
    // 初始化系统时钟和其他外设
    // ...
    while(1)
    {
        distance = GetDistance(); // 获取距离值
        // 处理距离值
        // ...
    }
}