单片机是STC12C5A16S2
HC-SR04 超声波测距模块实现数码管显示 , 但是数码管只显示0000没有数显示 ,我感觉可能是模块根本就没启动, 不知道程序哪里出了问题,新人小白希望各位大佬能够帮帮忙
单片机源程序如下:
#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#define w P2
#define d P0
typedef unsigned char uchar;
typedef unsigned int uint;
char code smg[10] = {0x28,0xeb,0x32,0xa2,0xe1,0xa4,0x24,0xea,0x20,0xa0};
//char code weixuan[4] = {0x7f,0xbf,0xdf,0xef};
uint a2,a1;
uint distance;
uchar ge;
uchar shi;
uchar bai;
uchar qian;
uchar time;
sbit Trig = P2^0;
sbit Echo = P2^1;
sbit w1 = P2^7;
sbit w2 = P2^6;
sbit w3 = P2^5;
sbit w4 = P2^4;
bit flag = 0;
void display();
void read();
void count();
void Init();
void delay(uchar p)
{
while(p--);
}
void delay20us()
{
uchar i;
_nop_();
_nop_();
_nop_();
i = 52;
while (--i);
}
void display()
{
// w = weixuan[3];
w1 = 1; w2 = 1; w3 = 1; w4 = 0;
d = smg[ge];
delay(100);
// w = weixuan[2];
w1 = 1; w2 = 1; w3 = 0; w4 = 1;
d = smg[shi];
delay(100);
// w = weixuan[1];
w1 = 1; w2 = 0; w3 = 1; w4 = 1;
d = smg[bai];
delay(100);
// w = weixuan[0];
w1 = 0; w2 = 1; w3 = 1; w4 = 1;
d = smg[qian];
delay(100);
w1 = 0;w2 = 0;w3 = 0;w4 = 0;
}
void Init_timer0()
{
TMOD = 0x01;
TH0 = 0;
TL0 = 0;
// TH1 = 0xf8;
// TL1 = 0x30;
// ET1 = 1;
ET0 = 1;
TR0 = 1;
// TR1 = 1;
EA = 1;
}
void count()
{
uchar a;
time = TH0*256+TL0;
TH0 = 0;
TR0 = 0;
distance = (time*0.17)/100;
if(distance <= 300 && flag == 1)
{
flag = 0;
a = distance;
ge = a%1000%100%10;
shi = a%1000%100/10;
bai = a%1000/100;
qian = a/1000;
}
else
{
distance = 0000;
}
}
void main()
{
Trig = 0;
Echo = 0;
Init_timer0();
display();
while(1)
{
Trig = 1;
delay20us();
Trig = 0;
if(Echo == 0)
{
TR0 = 1;
}
if(Echo == 1)
{
TR0 = 0;
}
count();
}
}
void Timer0() interrupt 1
{
flag = 1;
}
//void Timer1() interrupt 3 //T1中断用来扫描数码管和计800MS启动模块
// {
// TH1 = 0xf8;
// TL1 = 0x30;
// a2++;
// display();
// if(a2 >= 400)
// {
// a2 = 0;
// Trig = 1; //800MS 启动一次模块
// delay20us();
// Trig = 0;
// }
// }
不管是开始用的定时器还是后来放到主函数里用延时都是这样 。
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