Question

51单片机HC-SR04超声波测距模块哪里哪里错了

#include<STC15F2K60S2.H>
#include<INTRINS.H>
sbit BEEF = P0^5;
sbit Trig=P1^0;
sbit Echo=P1^2;
unsigned char g_counter;
unsigned int time1,time2;

void Delay20us() //@11.0592MHz
{
unsigned char i;

_nop_();
_nop_();
_nop_();
i = 52;
while (--i);
}

void Delay60ms() //@11.0592MHz
{
unsigned char i, j, k;

_nop_();
_nop_();
i = 3;
j = 134;
k = 115;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}

void main()
{
unsigned int distance;
TMOD=0X10;
Trig=0;
Echo=0;

while(1)
{
distance=0;
EA=0;
Trig=1;
Delay20us();
Trig=0;
while(Echo==0);
EA=1;
TH1=0;
TL1=0;
TF1=0;
TR1=1;
Delay60ms();
distance=(time1*256+time2)*0.0172;//厘米

if(distance <=100)
{
BEEF=~BEEF;
}
}

}
void isr_to() interrupt 3 using 1
{
TH1=0;
TL1=0;
if(Echo==0)
{
time1=TH1;
time2=TL1;
EA=0;

}

}

Answer 1

你好！你现在是什么现象

追问

就P0^5没反应;

追答

P0^5 在程序内就没有使用

Answer 2

TH1=0;
TL1=0;
if(Echo==0)
{
time1=TH1;
time2=TL1;
EA=0;

}

改为

if(Echo==0)
{
time1=TH1;
time2=TL1;
EA=0;
}
TH1=0;
TL1=0;