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標題: Proteus仿真測量溫度l時lcd1602只亮不顯示溫度 [打印本頁]

作者: 233612 時間: 2023-5-28 01:05
標題: Proteus仿真測量溫度l時lcd1602只亮不顯示溫度

#include"reg51.h"
sbit RS=P3^0;
sbit RW=P3^1;
sbit E=P3^2;
sbit DQ=P3^3;
unsigned int readtemp=0;
unsigned char str[]={"0123456789"};
unsigned char s[]={"Temperature:"};
void delay_18B20(unsigned int i)
{
for(;i>0;i--);
}
void Init_DS18B20(void)
{
unsigned char x=0;
DQ = 1; //DQ??
delay_18B20(8); //????
DQ = 0; //DQ??
delay_18B20(80); //????480us
DQ = 1; //????
delay_18B20(14);
x=DQ; //?x=0?????,?x=1?????
delay_18B20(20);
}
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
if(DQ){delay_18B20(1);DQ=1;}
else{delay_18B20(5);DQ = 1;}
dat>>=1;
}
}
unsigned char ReadTemperature(void)
{
unsigned char a=0,b=0;
unsigned int temp=0;
Init_DS18B20();
WriteOneChar(0xCC); // ????????
WriteOneChar(0x44); // ??????
delay_18B20(100); //
Init_DS18B20();
WriteOneChar(0xCC); //????????
WriteOneChar(0xBE); //???????
delay_18B20(100);
a=ReadOneChar(); //?????
b=ReadOneChar(); //?????
temp=((b*256+a)>>4); //???????16??????
return(temp);
}
void delay(unsigned int t)
{
unsigned int i=0,j=0;
for(i=0;i<t;i++)
{
for(j=0;j<120;j++);
}
}
void writedat(unsigned char dat)
{
RS=1;
RW=0;
E=0;
P2=dat;
delay(5);
E=1;
E=0;
}
void writecom(unsigned char com)
{
RS=0;
RW=0;
E=0;
P2=com;
delay(5);
E=1;
E=0;
}
void inttlcd()
{
writecom(0x38);
writecom(0x0c);
writecom(0x06);
writecom(0x01);
}
void display()
{
unsigned char temp0=0,temp1=0,temp2=0,i=0;
temp0=readtemp/100;
temp0=(readtemp%100)/10;
temp0=readtemp%10;
writecom(0x80);
delay(5);
while(s[i]!='\0')
{
writedat(s[i]);
delay(5);
i++;
}
writecom(0x80+0x40+5);
writedat(str[temp0]);
delay(5);
writedat(str[temp1]);
delay(5);
writedat(str[temp2]);
delay(5);
writedat(0xdf);
delay(5);
writedat('C');
delay(5);
}
void main()
{
initlcd();
while(1)
{
readtemp=ReadTemperature();
display();
}
}

復制代碼

屏幕截圖_20230528_005304.png (55.2 KB, 下載次數: 35)

作者: wulin 時間: 2023-5-28 06:22
1.缺少函數ReadOneChar()2.LCD初始化函數名不符

3.顯示函數中 temp1、temp2沒有賦值
4.顯示固定字符代碼的位置不當

5.仿真中1602數據接口連接與程序不符

#include"reg51.h"
sbit RS=P3^0;
sbit RW=P3^1;
sbit E=P3^2;
sbit DQ=P3^3;
unsigned int readtemp=0;
unsigned char str[]={"0123456789"};
unsigned char s[]={"Temperature:"};
void delay_18B20(unsigned int i)
{
for(;i>0;i--);
}
void Init_DS18B20(void)
{
unsigned char x=0;
DQ = 1; //DQ??
delay_18B20(8); //????
DQ = 0; //DQ??
delay_18B20(80); //????480us
DQ = 1; //????
delay_18B20(14);
x=DQ; //?x=0?????,?x=1?????
delay_18B20(20);
}
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
if(DQ){delay_18B20(1);DQ=1;}
else{delay_18B20(5);DQ = 1;}
dat>>=1;
}
}
unsigned char ReadOneChar()
{
unsigned char i=0;
unsigned char dat=0;
for(i=8;i>0;i--)
{
DQ=0;
dat>>=1;
DQ=1;
if(DQ)
dat|=0x80;
delay_18B20(4);
}
return (dat);
}
unsigned char ReadTemperature(void)
{
unsigned char a=0,b=0;
unsigned int temp=0;
Init_DS18B20();
WriteOneChar(0xCC); // ????????
WriteOneChar(0x44); // ??????
delay_18B20(100); //
Init_DS18B20();
WriteOneChar(0xCC); //????????
WriteOneChar(0xBE); //???????
delay_18B20(100);
a=ReadOneChar(); //?????
b=ReadOneChar(); //?????
temp=((b*256+a)>>4); //???????16??????
return(temp);
}
void delay(unsigned int t)
{
unsigned int i=0,j=0;
for(i=0;i<t;i++)
{
for(j=0;j<120;j++);
}
}
void writedat(unsigned char dat)
{
RS=1;
RW=0;
E=0;
P2=dat;
delay(1);
E=1;
E=0;
}
void writecom(unsigned char com)
{
RS=0;
RW=0;
E=0;
P2=com;
delay(1);
E=1;
E=0;
}
void initlcd()
{
writecom(0x38);
writecom(0x0c);
writecom(0x06);
writecom(0x01);
}
void display()
{
unsigned char temp0=0,temp1=0,temp2=0;
temp0=readtemp/100;
temp1=(readtemp%100)/10;
temp2=readtemp%10;
writecom(0x80+0x40+5);
writedat(str[temp0]);
delay(5);
writedat(str[temp1]);
delay(5);
writedat(str[temp2]);
delay(5);
writedat(0xdf);
delay(5);
writedat('C');
delay(5);
}
void main()
{
unsigned char i;
initlcd();
writecom(0x80);
while(s[i]!='\0')
{
writedat(s[i]);
delay(5);
i++;
}
while(1)
{
readtemp=ReadTemperature();
display();
}
}

復制代碼

作者: wpppmlah 時間: 2023-5-28 08:11

void writedat(unsigned char dat)
{
RS=1;
RW=0;
E=0;
P2=dat;
delay(5);
E=1;
E=0;
}
void writecom(unsigned char com)
{
RS=0;
RW=0;
E=0;
P2=com;
delay(5);
E=1;
E=0;
}

復制代碼

LCD1602的數據端口與單片機的驅動端口連接錯誤。
代碼中，顯示驅動端口是P2 實際仿真圖中卻沒有與P2連接。
P2.0 ---D0 P2.1-----D1 .......P2.7 ------ D7

作者: 233612 時間: 2023-5-28 14:33

wulin 發表于 2023-5-28 06:22
1.缺少函數ReadOneChar()2.LCD初始化函數名不符

3.顯示函數中 temp1、temp2沒有賦值

感謝大佬解答，但是我將您的代碼復制后的結果卻是90°C，請問這是怎么回事呢？

屏幕截圖_20230528_142623.png (51.43 KB, 下載次數: 36)

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