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標題: DS18B20上的溫度為什么無法正常顯示在顯示屏上 [打印本頁]

作者: 小白熊123 時間: 2021-6-15 14:25
標題: DS18B20上的溫度為什么無法正常顯示在顯示屏上
無論按那個開關都這樣顯示就是顯示不出來正確結果求大佬幫忙看看

#include<reg51.h>

unsigned intshu[]={0x30,0x31,0x32,0x33,0x34,0X35,0x36,0x37,0x38,0x39};

unsignedlong t;

unsignedchar k,f=0;

sbitRS=P2^0;

sbitRW=P2^1;

sbitE=P2^2;

sbitDS=P1^1;

void del(int count ) //延時程序

{while(count--);}

voiddelay(unsigned int count)//延時程序

{int p;

while(count--)

for(p=0;p<125;p++);

}

voidwrite(unsigned char date)//向DS18B20中寫入數據

{ int i;

for(i=0;i<8;i++)

{DS=0;

DS=date&0x01; // 寫入數據。

del(15)

DS=1;

date>>=1;

}

void init(unsigned int n)// RW=0,RS=0;向指令寄存器中寫入命令，即對1602初始化。

{delay(10);

E=0;

RS=0;

RW=0;

E=1;

P0=n;

E=0;

}

voidwrite_data(unsigned char n)//RS=1,RW=0;向數據寄存器中寫入數據，即顯示的數符。

{delay(10);

E=0;

RS=1;

RW=0;

E=1;

P0=n;

E=0;

}

voidwrite2(unsigned char i)

{ i+=0x30;

if(i==4){i=0;}

write(0x55);

write(0x28);

write(i);

write(0xc5);

write(0xb8);

write(0x00);

}

voidmatchrom() //匹配ROM

{

unsigned char i;

k=P3;

switch(k)

{ case 0: { f=1;

init(0x80);write_data(0x50);//press

init(0x81);write_data(0x72);

init(0x82);write_data(0x65);

init(0x83);write_data(0x73);

init(0x84);write_data(0x73);

init(0x85);write_data(0x80);

init(0x86);write_data(0x61);//a

init(0x87);write_data(0x80);

init(0x88);write_data(0x6b);//key

init(0x89);write_data(0x65);

init(0x8a);write_data(0x79);

init(0x8b);write_data(0x80);

init(0x8c);write_data(0x21);//!

for(i=0x8d;i<=0xcf;i++)

{init(i);write_data(0x80);}

}break;

case 1: { init(0x83);write_data(0x31); //NO 1

write2(0);

write(0x8e); }break;

case 2: { init(0x83);write_data(0x32);//NO 2

write2(1);

write(0xb9); }break;

case 4: { init(0x83);write_data(0x33); //NO 3

write2(2);

write(0xe0); }break;

case 8:{ init(0x83);write_data(0x34); //NO 4

write2(3);

write(0xd7); } break;

default:{ f=1;

init(0x80);write_data(0x50); //please

init(0x81);write_data(0x6c);

init(0x82);write_data(0x65);

init(0x83);write_data(0x61);

init(0x84);write_data(0x73);

init(0x85);write_data(0x65);

init(0x86);write_data(0x80);

init(0x87);write_data(0x70); //press

init(0x88);write_data(0x72);

init(0x89);write_data(0x65);

init(0x8a);write_data(0x73);

init(0x8b);write_data(0x73);

init(0x8c);write_data(0x80);

init(0x8d);write_data(0x6f); //one

init(0x8e);write_data(0x6e);

init(0x8f);write_data(0x65);

init(0xc0);write_data(0x80);

init(0xc1);write_data(0x80);

init(0xc2);write_data(0x80);

init(0xc3);write_data(0x6b);//key

init(0xc4);write_data(0x65);

init(0xc5);write_data(0x79);

init(0xc6);write_data(0x80);

init(0xc7);write_data(0x6f);//only

init(0xc8);write_data(0x6e);

init(0xc9);write_data(0x6c);

init(0xca);write_data(0x79);

init(0xcb);write_data(0x80);

init(0xcc);write_data(0x21);//!

init(0xcd);write_data(0x80);

init(0xce);write_data(0x80);

init(0xcf);write_data(0x80); }break;

}

void lcd(unsigned char m) //當為負溫度時，液晶顯示可以高位為0屏蔽.

{ init(0x80);write_data(0x4e);//NO

init(0x81);write_data(0x4f);

init(0x82);write_data(0x80);

init(0x84);write_data(0x80);

init(0x85);write_data(0x74);//temperature

init(0x86);write_data(0x65);

init(0x87);write_data(0x6d);

init(0x88);write_data(0x70);

init(0x89);write_data(0x65);

init(0x8a);write_data(0x72);

init(0x8b);write_data(0x61);

init(0x8c);write_data(0x74);

init(0x8d);write_data(0x75);

init(0x8e);write_data(0x72);

init(0x8f);write_data(0x65);

init(0xc0);write_data(0x80);

init(0xc1);write_data(0x80);

init(0xc2);write_data(0x69); //is:

init(0xc3);write_data(0x73);

init(0xc4);write_data(0x3a);

if(m==1)

{if((t/1000%10)!=0)

{init(0xc5);write_data(0x2d);

init(0xc6);write_data(shu[t/1000%10]);

}

else

{init(0xc5);write_data(0xfe);

init(0xc6);write_data(0x2d);

}

else

{if(t/10000!=0)

{init(0xc5);write_data(shu[t/10000]);

init(0xc6);write_data(shu[t/1000%10]);

}

else

{if((t/1000%10)!=0)

{init(0xc5);write_data(0xfe);

init(0xc6);write_data(shu[t/1000%10]);

}

else

{init(0xc5);write_data(0xfe);

init(0xc6);write_data(0xfe);

}

init(0xc7);write_data(shu[t/100%10]);

init(0xc8);write_data(0x2e);

init(0xc9);write_data(shu[(t%100)/10]);

init(0xcb);write_data(0x27);

init(0xcc);write_data(0x43);

init(0xcd);write_data(0x80);

init(0xce);write_data(0x80);

init(0xcf);write_data(0x80);

}

void jiance()

{unsignedchar n=0;

do{DS=1;

DS=0;

del(100);

DS=1;

del(10); 。

n=DS;

del(20); //低電平至少要持續60~240us

} while(n==1); 。

}

read() //從DS18B20中讀出數據

{unsigned char i;

unsigned long date=0;

for(i=0;i<16;i++)

{ DS=0; //主機在某一時刻將總線從高電平拉到低電平.

date>>=1;

DS=1;

del(3); //保持15us將總線拉到高電平,產生讀時間隙

if(DS)

date|=0x8000;

del(8); //讀數據需要持續35us~60us.

}

return(date);

}

void main()

{unsigned long flag=0;

EA=0;

SP=0X60;

init(0x01); //對液晶屏初始化

init(0x38);

init(0x0c);

init(0x06);

while(1)

{

jiance(); //對DS18B20初始?

matchrom();

write(0x44); //啟動溫度變換

del(100);

jiance();

matchrom();

if(f==1)

{f=0;}

else

{ write(0xbe); // 讀暫存存儲器

t=read();

flag=t&0x8000; //對讀取的數據進行處理

if(flag==0x8000)

{t=~t;

t=t+1;

t=t*25;

t>>=2;

lcd(1);//負值

}

else

{ t=t*25;

t>>=2;

lcd(0);//正值

}

作者: 人人學會單片機 時間: 2021-6-19 08:50
LCD1602顯示℃ 這種自定義符號 http://m.raoushi.com/bbs/dpj-200685-1.html
LCD1602液晶最新資料說明了具體的時間要求 http://m.raoushi.com/bbs/dpj-205768-1.html

歡迎光臨 (http://m.raoushi.com/bbs/)