1602和HC-SR04超声波模块测距C语言程序

#define uchar unsigned char

#define uint unsigned int

/**************************

Trig超声波传感器控制端，

Echo超声波传感器接收端。

***************************/

sbit Trig=P2^4;

sbit Echo=P3^2;

/**************************

lcd_rs为1602液晶数据命令选择，

lcd_en为1602液晶使能端，lcd_rw

为1602液晶读写控制端。

***************************/

sbit lcd_rs=P2^5;

sbit lcd_rw=P2^6;

sbit lcd_en=P2^7;

#include

#include

#include"ZNCCSB1.h"

void init(); //函数初始化

void LCD_init(); //LCD的初始化void LCD_write_date(uchar date); //lcd的写数据函数void LCD_write_com(uchar com); //lcd的写指令函数void delay(uint); //延时函数

void dev_delay(); //读写延时函数void distance_display(); //lcd的显示函数uchar code num[] ={'0','1','2','3','4','5','6','7','8','9','m'};

uchar code warning[]={"Measurement error!"};

uchar T0_cout,display_flag;

uint T0_time;

void main()

{

delay(1500);

init();

while(1)

{

Trig=1;

delay(20);

Trig=0;

while(Echo==0);

TR0=1;

while(Echo==1);

//TR0=0;

while(display_flag==0);

while(display_flag==1)

{

display_flag=0;

LCD_init();

distance_display();

delay(1500);

}

}

}

void dev_delay()

{

_nop_();

_nop_();

_nop_();

_nop_();

}

void delay(uint time)

{

uchar x;

uint y;

for(y=time;y>0;y--)

for(x=220;x>0;x--);

}

void LCD_write_com(uchar com) {

lcd_en=0;

lcd_rs=0;

lcd_rw=0;

P0=com;

dev_delay();

lcd_en=1;

delay(1);

lcd_en=0;

dev_delay();

}

void LCD_write_date(uchar date) {

lcd_rs=1;

lcd_rw=0;

lcd_en=0;

P0=date;

dev_delay();

lcd_en=1;

delay(1);

lcd_en=0;

dev_delay();

}

void LCD_init()

{

LCD_write_com(0x38);

LCD_write_com(0x0c);

LCD_write_com(0x06);

LCD_write_com(0x01);

}

void init()

{

LCD_init();

TMOD=0x01;

TH0=0;

TL0=0;

EA=1; //总中断开启

ET0=1; //T0中断开启

EX0=1; //外部中断0

IT0=1; //下降沿触发

TR0=0;

T0_time=0;

T0_cout=0;

Trig=0;

Echo=0;

display_flag=0;

}

void time0() interrupt 1

{

TH0=0;

T0_cout++;

}

void int0() interrupt 0

{

TR0=0;

T0_time=TH0*256+TL0;

display_flag=1;

TH0=0;

TL0=0;

T0_cout=0;

}

void distance_display()

{

uchar i,ge,shi,bai,qian;

uint distance;

//T0_time=T0_cout*65536+TH0*256+TL0;

//TH0=0;

//TL0=0;

//T0_cout=0;

distance=T0_time*0.17; //距离为毫米T0_time=0;

if(distance<4000&&(!T0_cout))

{

qian=distance/1000;

bai=distance%1000/100;

shi=distance%100/10;

ge=distance%10/1;

distance=0;

LCD_write_date(num[qian]);

LCD_write_date(num[bai]);

LCD_write_date(num[shi]);

LCD_write_date(num[ge]);

LCD_write_date(num[10]);

LCD_write_date(num[10]);

}

else

{

for(i=0;i<18;i++)

{

LCD_write_date(warning[i]);

distance=0;

}

}