HCSR04测距显示出来的一直为000?附单片机程序

ID:1075452 · 发表于 2023-5-5 12:50

#include "HCSR04.h"

#define uchar unsigned char
#define uint  unsigned int

int distance;

sbit Trig = P2^1;
sbit Echo = P2^2;

void Delay10us()
{
      TMOD=0x10;
      TH0=0x3c;
      TL0=0xb0 ;
      TH0=(65536-10000)/256;  //10ms
      TL0=(65536-10000)%256;
      EA=1;
      TR0 = 1;
      while(!TF0);
      TF0 = 0;
}

unsigned int RunOnce()
{
      unsigned int time;
      Trig = 0;
      Trig = 1;
      Delay10us();
      Trig = 0;
      while(!Echo)
      {
            TH0 = 0;
            TL0 = 0;
            TR0 = 1;
      }
      while(Echo)
      {
            TR0 = 0;
            time = TH0*256 + TL0;
            TH0 = 0;
            TL0 = 0;
      }
      distance = time * 0.018;
      return distance;
}

void TimerOisr() interrupt 1 using 1
{
      TH1=(65536-10000)/256;
      TL1=(65536-10000)%256;
}

ID:1055614 · 发表于 2023-5-6 15:19

解决了吗？我的也是这样，把超声波模块插上显示0；拔掉显示越界，用手摸着4个引脚能检测

ID:1034262 · 发表于 2023-5-6 21:10

示波器先看一下触发、应答波形和时间差。

ID:140371 · 发表于 2023-5-6 21:18

程式有 BUG T0 T1 衝突了

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