今天弄了一下以前买的 超声波测距的模块， 51单片机接上 12864液晶，HC-SR04超声波模块，就可以了，具体程序没怎么看，超声波模块的硬件也不晓得，今天先贴个图，贴个程序吧（程序是淘宝买的模块附赠的）。
源程序：
/******************************************************************************/
/* Name: LCD12864(St7920/St7921)+超声波测距模块+STC89C52 */
/* HC-SR04 超声波测距模块 DEMO 程序 */
/* 晶振：11.0592M */
/* 接线：模块TRIG接 P1.2 ECH0 接P1.1 */
/* RS(CS) 接 P3.3; */
/* RW(SID) 接 P3.4; */
/* E(SCLK) 接 P3.5; */
/* PSB 接 GND 串行模式 */
/******************************************************************************/
#include AT89X51.H
#include intrins.h
//引脚定义
sbit RX = P1 ^ 1;
sbit TX = P1 ^ 2;
sbit CS = P3 ^ 3; //片选 高电平有效 单片LCD使用时可固定高电平
sbit SID = P3 ^ 4; //数据
sbit SCLK = P3 ^ 5; //时钟
//Function Definition 函数声明
void Delay(int num);
void Init_DS18B20(void);
unsigned char ReadOneChar(void);
void WriteOneChar(unsigned char dat);
unsigned int ReadTemperature(void);
void clock_out(unsigned char dd);
unsigned char clock_in(void);
unsigned char read_clock(unsigned char ord);
void write_clock(unsigned char ord, unsigned char dd);
void Disp(void);
void id_case1_key(void);
void id_case2_key(void);
void Set_time(unsigned char sel,bit sel_1);
void Timer0_Init(void);
void Init_1302(void);
void Set_Bell(unsigned char sel, bit sel_1);
void Bell(void);
//12864
void Write_char(bit start, unsigned char ddata);
void Send_byte(unsigned char bbyte);
void Delaynms(unsigned int di);
void Lcd_init(void);
void Disp_img(unsigned char *img);
void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_set_xy( unsigned char x, unsigned char y );
unsigned char code num[]={"0123456789 :.-"};
unsigned char code waves[]={"超声波测距系统"};
unsigned char code znwk[] ={"智能微控工作室"};
unsigned char code CM[] = {"M"};
unsigned int time=0;
long S=0;
bit flag =0;
unsigned char disbuff[4] ={ 0,0,0,0,};
unsigned char code logo[]={
/*-- 调入了一幅图像：logo.bmp -- */
/*-- 宽度x高度=128x64 欢迎使用本产品LOGO --*/
/*-- 调入了一幅图像：C:\Documents and Settings\lwd\桌面\新建文件夹\X.bmp --*/
/*-- 宽度x高度=128x64 --*/
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};
/******************************************************************************/
void Lcd_init(void) //初始化LCD
{
Delaynms(10); //启动等待，等LCM讲入工作状态
CS=1;
Write_char(0,0x30); //8 位介面，基本指令集
Write_char(0,0x0c); //显示打开，光标关，反白关
Write_char(0,0x01); //清屏，将DDRAM的地址计数器归零
}
/******************************************************************************/
void Write_char(bit start, unsigned char ddata) //写指令或数据
{
unsigned char start_data,Hdata,Ldata;
if(start==0)
start_data=0xf8; //写指令
else
start_data=0xfa; //写数据
Hdata=ddata0xf0; //取高四位
Ldata=(ddata4)0xf0; //取低四位
Send_byte(start_data); //发送起始信号
Delaynms(5); //延时是必须的
Send_byte(Hdata); //发送高四位
Delaynms(1); //延时是必须的
Send_byte(Ldata); //发送低四位
Delaynms(1); //延时是必须的
}
/******************************************************************************/
void Send_byte(unsigned char bbyte) //发送一个字节
{
unsigned char i;
for(i=0;i8;i++)
{
SID=bbyte0x80; //取出最高位
SCLK=1;
SCLK=0;
bbyte=1; //左移
}
}
/******************************************************************************/
void Delaynms(unsigned int di) //延时
{
unsigned int da,db;
for(da=0;dadi;da++)
for(db=0;db10;db++);
}
/******************************************************************************/
void Disp_img(unsigned char *img) //图形方式12864显示字模221 横向取膜
{
unsigned char i,j;
unsigned int k = 0;
Write_char(0,0x36); //图形方式
for(i=0;i32;i++)
{
Write_char(0,0x80+i);
Write_char(0,0x80);
for(j=0;j16;j++)
{
Write_char(1,img[k++]);
}
}
for(i=0;i32;i++)
{
Write_char(0,0x80+i);
Write_char(0,0x88);
for(j=0;j16;j++)
{
Write_char(1,img[k++]);
}
}
}
/******************************************************************************/
void Clr_Scr(void)//清屏函数
{
Write_char(0,0x01);
}
/******************************************************************************/
void LCD_set_xy( unsigned char x, unsigned char y )
{ //设置LCD显示的起始位置，X为行，Y为列
unsigned char address;
switch(x)
{
case 0: address = 0x80 + y; break;
case 1: address = 0x80 + y; break;
case 2: address = 0x90 + y; break;
case 3: address = 0x88 + y; break;
case 4: address = 0x98 + y; break;
default:address = 0x80 + y; break;
}
Write_char(0, address);
}
/******************************************************************************/
void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s)
{ // 中英文字符串显示函数
LCD_set_xy( X, Y );
while (*s)
{
Write_char( 1, *s );
s ++;
Delaynms(1);
}
}
/******************************************************************************/
void LCD_Write_number(unsigned char s)// 数字显示函数
{
Write_char(1,num[s]);
Delaynms(1);
}
/******************************************************************************/
void Lcd_Mark2(void)
{
Clr_Scr();//清屏
LCD_Write_string(1,0,znwk);//
LCD_Write_string(2,0,waves);//
LCD_Write_string(3,7,CM);//
}
/********************************************************/
void Conut(void)
{
time=TH0*256+TL0;
TH0=0;
TL0=0;
S=time*1.87/100; //算出来是CM 11。0592M晶振
if(flag==1) //超出测量
{
flag=0;
LCD_set_xy( 3, 4 );
LCD_Write_number(13);
LCD_Write_number(12);
LCD_set_xy( 3, 5 );
LCD_Write_number(13);
LCD_Write_number(13);
}
else
{
disbuff[1]=S%1000/100;
disbuff[2]=S%1000%100/10;
disbuff[3]=S%1000%10 %10;
LCD_set_xy( 3, 4 );
LCD_Write_number(disbuff[1]);
LCD_Write_number(12);
LCD_set_xy( 3, 5 );
LCD_Write_number(disbuff[2]);
LCD_Write_number(disbuff[3]);
}
}
/********************************************************/
void delayms(unsigned int ms)
{
unsigned char i=100,j;
for(;ms;ms--)
{
while(--i)
{
j=10;
while(--j);
}
}
}
/********************************************************/
void zd0() interrupt1 //T0中断用来计数器溢出,超过测距范围
{
flag=1; //中断溢出标志
}
/********************************************************/
void StartModule() //T1中断用来扫描数码管和计800MS启动模块
{
TX=1; //800MS 启动一次模块
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
TX=0;
}
/********************************************************/
void main(void)
{
TMOD=0x01; //设T0为方式1，GATE=1
TH0=0;
TL0=0;
TR0=1;
Lcd_init(); //设置液晶显示器
Clr_Scr(); //清屏
Disp_img(logo); //显示欢迎使用本产品LOGO
Delaynms(1000);
Lcd_init(); //从图形显示状态下返回
Lcd_Mark2();
while(1)
{
StartModule();
//计算
while(!RX); //当RX为零时等待
TR0=1; //开启计数
while(RX); //当RX为1计数并等待
TR0=0; //关闭计数
Conut();
delayms(80); //80MS
}
}
原文链接：https://www.eeworld.com.cn/mcu/article_2016090128966.html
