51单片机-超声波测距程序

0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

};

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

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=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

for(db=0;db<10;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;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(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);

}

}

}

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