stm32f407-hcsr04超声波

ID:532830 · 发表于 2020-6-3 14:25

#include "stm32f4xx.h"
#include "usart.h"
#include "delay.h"
#include "voice.h"

int main()
{
u16 times,i=5,all;
long long truth;
  int  distance=0;

uart_init(115200);//初始化串口波特率为115200
   voice_int();
   delay_init(168);
while(1)
{
      for(i=0;i<5;i++)
                  {

                  printf("2\r\n");

                  GPIO_SetBits(GPIOB, GPIO_Pin_0); //给20um的高电平
                  delay_ms(10);
                  GPIO_ResetBits(GPIOB, GPIO_Pin_0);

                  printf("3\r\n");
            TIM3->CNT = 0;
         while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1)  ==0); //等待echo->low
                              //计数器清零，开始计数
            TIM_Cmd(TIM3, ENABLE);//开启定时器
      while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1)  ==1);//等待echo->high
                  TIM_Cmd(TIM3, DISABLE);    //关闭定时器
printf("5\r\n");


                  times = TIM_GetCounter(TIM3);
                  distance = (times*340)/200;  //(1/200000)*344/2=0.00085m
                  all+=distance;
                  printf("************");
                  }

         truth = all/5;
         all=0;
      printf("距离为cm:%lld\r\n",truth);

            }
}

ID:122986 · 发表于 2021-9-19 09:00

测试过吗

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