单片机源程序如下:
- #include <STC89C51.h>
- #include <intrins.h>
- #include <stdio.h>
- #include"dht11.h"
- //引脚定义
- sbit RX = P1 ^ 1;
- sbit TX = P1 ^ 2;
- sbit CS = P0 ^ 7; //片选 高电平有效 单片LCD使用时可固定高电平
- sbit SID = P0 ^ 6; //数据
- sbit SCLK = P0 ^ 5; //时钟
- sbit PSB = P0 ^ 4; //PSB
- sbit FMQ = P0 ^ 3;//蜂鸣器
- //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 lnit(unsigned int Init_Uart);
- 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[]={"倒车雷达系统"};
- unsigned char code znwk[] ={"距离:"};
- unsigned char code CM[] = {"M"};
- unsigned char code shidu[] = {"Tem:"};
- unsigned char code wendu[] = {"Hum:"};
- unsigned char code baifenbi[] = {"%"};
- unsigned char const sheshidu[]="℃";
- unsigned int time=0;
- long S=0;
- bit flag =0;
- unsigned char disbuff[5] ={ 0,0,0,0,0,};
- /******************************************************************************/
- void Lcd_init(void) //初始化LCD
- {
- PSB = 0;
- 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=ddata&0xf0; //取高四位
- Ldata=(ddata<<4)&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;i<8;i++)
- {
- SID=bbyte&0x80; //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;da<di;da++)
- for(db=0;db<10;db++);
- }
- void delayms(unsigned int ms)
- {
- unsigned char i=100,j;
- for(;ms;ms--)
- {
- while(--i)
- {
- j=10;
- while(--j);
- }
- }
- }
- /******************************************************************************/
- 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;i<32;i++)
- {
- Write_char(0,0x80+i);
- Write_char(0,0x80);
- for(j=0;j<16;j++)
- {
- Write_char(1,img[k++]);
- }
- }
- for(i=0;i<32;i++)
- {
- Write_char(0,0x80+i);
- Write_char(0,0x88);
- for(j=0;j<16;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(2,0,znwk);//
- LCD_Write_string(1,0,waves);//
- LCD_Write_string(2,7,CM);//
- LCD_Write_string(3,0,shidu);//
- LCD_Write_string(4,0,wendu);//
- LCD_Write_string(3,7,sheshidu);//
- LCD_Write_string(4,7,baifenbi);//
- }
- /********************************************************/
- 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( 2, 4 );
- LCD_Write_number(13);
- LCD_Write_number(12);
- LCD_set_xy( 2, 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;
- //disbuff[4]=S%1000%10%10;
- LCD_set_xy( 2, 4 );
- LCD_Write_number(disbuff[1]);
- LCD_Write_number(12);
- LCD_set_xy( 2, 5 );
- LCD_Write_number(disbuff[2]);
- LCD_Write_number(disbuff[3]);
- // LCD_Write_number(disbuff[4]);
-
- }
- }
- void InitUART(void)//使用定时器1作为串口波特率发生器
- {
- TH1 = 0xFD; //晶振11.0592mhz 波特率设为9600
- TL1 = TH1;
- TMOD|= 0x20; //定时器1方式2
- SCON = 0x50; //串口接收使能
- ES = 1; //串口中断使能
- TR1 = 1; //定时器1使能
- TI = 1; //发送中断标记位,必须设置
- EA = 1;
- }
- void YYBB(void) //语音播报函数
- {
- if(S<10)
- { printf("停车\n");//串口打印结果
- delayms(50);
- }
- else
- { //printf("<V>2");
- printf("%.2f米\n",(float)S/100);
- delayms(50);
- }
- }
-
-
- /********************************************************/
- /********************************************************/
- void zd0() interrupt 1 //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
- //Disp_img(1);
- //Delaynms(10000);
- //Lcd_init(); //从图形显示状态下返回
- Lcd_Mark2();
- InitUART(); //初始化串口 串口打印
- while(1)
- {
-
-
- // Rec_DHT();
- // Conut1();
- // Conut2();
- 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(100); //80MS
- YYBB();
- }
- }
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