#include<AT89X51.H>
#include<intrins.h>
//引腳定義
sbit RX = P1 ^ 0; //RX=Echo
sbit TX = P1 ^ 1; //TX=trig
sbit CS = P3 ^ 5; //CS=RS
sbit SID = P3 ^ 6; //SID=RW
sbit SCLK = P3 ^ 4; // SCLK=E; PSB接GND
unsigned char code num[]={"0123456789 :.-"};
unsigned char code d1[] ={"水情檢測系統"};
unsigned char code d2[]={"水位:"};
unsigned char code d3[]={"PH值:"};
unsigned char code d4[]={"電壓值:"};
unsigned char code dw1[] = {"M"};
unsigned char code dw2[] = {"V"};
unsigned int time=0;
long S=0;
bit flag =0;
unsigned char disbuff[4] ={ 0,0,0,0,};
void Delaynms(unsigned int di) //延時
{
unsigned int da,db;
for(da=0;da<di;da++)
for(db=0;db<10;db++);
}
void Send_byte(unsigned char bbyte) //發送一個字節
{
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 Write_char(bit start, unsigned char ddata) //寫指令或數據
{
unsigned char start_data,Hdata,Ldata;
if(start==0)
start_data=0xf8; //寫指令
else
start_data=0xfa; //寫數據
Hdata=ddata&0xf0; //取高四位
Ldata=(ddata<<4)&0xf0; //取低四位
Send_byte(start_data); //發送起始信號
Delaynms(5); //延時是必須的
Send_byte(Hdata); //發送高四位
Delaynms(1); //延時是必須的
Send_byte(Ldata); //發送低四位
Delaynms(1); //延時是必須的
}
void Lcd_init(void) //初始化LCD
{
Delaynms(10); //啟動等待，等LCM講入工作狀態
CS=1;
Write_char(0,0x30); //8 位介面，基本指令集
Write_char(0,0x0c); //顯示打開，光標關，反白關
Write_char(0,0x01); //清屏，將DDRAM的地址計數器歸零
}
void Disp_img(unsigned char *img) //圖形方式12864顯示字模221 橫向取膜
{
unsigned char i,j;
unsigned int k = 0;
Write_char(0,0x36); //圖形方式
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)//清屏函數
{
Write_char(0,0x01);
}
void LCD_set_xy( unsigned char x, unsigned char y )
{ //設置LCD顯示的起始位置，X為行，Y為列
unsigned char address;
switch(x)
{
case 0: address = 0x80 + y; break;
case 1: address = 0x90 + y; break;
case 2: address = 0x88 + y; break;
case 3: 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)
{ // 中英文字符串顯示函數
LCD_set_xy( X, Y );
while (*s)
{
Write_char( 1, *s );
s ++;
Delaynms(1);
}
}
void LCD_Write_number(unsigned char s)// 數字顯示函數
{
Write_char(1,num[ s]);
Delaynms(1);
}
void Lcd_Mark2(void)
{
Clr_Scr();//清屏
LCD_Write_string(0,1,d1);//
LCD_Write_string(1,0,d2);//
LCD_Write_string(2,0,d3);
LCD_Write_string(3,0,d4);
LCD_Write_string(1,7,dw1);//
LCD_Write_string(3,7,dw2);//
}
void Conut(void)
{
time=TH0*256+TL0;
TH0=0;
TL0=0;
S=time*1.87/100; //算出來是M 11。0592M晶振
if(flag==1) //超出測量
{
flag=0;
LCD_set_xy( 1, 3 ); //第二行第三列開始顯示
LCD_Write_number(13);
LCD_Write_number(12);
LCD_set_xy( 1, 4 );
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( 1, 3 );
LCD_Write_number(disbuff[1]);
LCD_Write_number(12);
LCD_set_xy( 1, 4 );
LCD_Write_number(disbuff[2]);
LCD_Write_number(disbuff[3]);
}
}
void zd0() interrupt 1 //T0中斷用來計數器溢出,超過測距范圍
{
flag=1; //中斷溢出標志
}
void StartModule() //T1中斷用來掃描數碼管和計800MS啟動模塊
{
TX=1; //800MS 啟動一次模塊
_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; //設T0為方式1，GATE=1
TH0=0;
TL0=0;
TR0=1;
// Lcd_init(); //設置液晶顯示器
// Clr_Scr(); //清屏
Lcd_init();
Lcd_Mark2();
while(1)
{
StartModule();
//計算
while(!RX); //當RX為零時等待
TR0=1; //開啟計數
while(RX); //當RX為1計數并等待
TR0=0; //關閉計數
Conut();
Delaynms(80); //80MS
}
} |
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