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| #include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DQ = P3^3; //DS18B20数据口
uchar FLAG=1; //正负温度标志
unsigned char TMPH,TMPL;
//这三个引脚参考资料
sbit E=P3^2; //1602使能引脚
sbit RW=P3^1; //1602读写引脚
sbit RS=P3^0; //1602数据/命令选择引脚
void delay(uchar N)
{
while(--N);
}
void delay\_1()
{
delay(245);
delay(245);
}
// 1602命令函数
void enable(uchar del)
{
P1 = del;
RS = 0;
RW = 0;
E = 0;
delay\_1();
E = 1;
delay\_1();
}
void write(uchar del)
{
P1 =del;
RS = 1;
RW = 0;
E = 0;
delay\_1();
E = 1;
delay\_1();
}
// 1602初始化，请参考1602的资料
void L1602\_init(void)
{
enable(0x01);
enable(0x38);
enable(0x0c);
enable(0x06);
enable(0xd0);
}
//改变液晶中某位的值，如果要让第一行，第五个字符显示"b" ，调用该函数如下 L1602\_char(1,5,'b')
void L1602\_char(uchar hang,uchar lie,char sign)
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0xc0;
a = a + lie - 1;
enable(a);
write(sign);
}
//改变液晶中某位的值，如果要让第一行，第五个字符开始显示"ab cd ef" ，调用该函数如下L1602\_string(1,5,"ab cd ef;")
void L1602\_string(uchar hang,uchar lie,uchar \*p)
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0xc0;
a = a + lie - 1;
enable(a);
while(1)
{
if(\*p == '\0') break;
write(\*p);
p++;
}
}
bit Init\_Ds18b20()
{
bit Status_Ds18b20;
DQ=1;
delay(5);
DQ=0;
delay(200);
delay(200);
DQ=1;
delay(50);
Status_Ds18b20=DQ;
delay(25);
return Status_Ds18b20;
}
uchar Read\_Ds18b20()
{
uchar i=0,dat=0;
for(i=0;i<8;i++)
{
DQ=0;
dat>>=1;
DQ=1;
if(DQ)
dat|=0x80;
delay(25);
}
return dat;
}
void Witie\_Ds18b20(uchar dat)
{
uchar i=0;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delay(25);
DQ=1;
dat>>=1;
}
delay(25);
}
void Trans()
{
uint temp;
float tem;
Init\_Ds18b20(); //复位
Witie\_Ds18b20(0xcc); //写跳过ROM命令
Witie\_Ds18b20(0x44); //开启温度转换
Init\_Ds18b20();
Witie\_Ds18b20(0xcc);
Witie\_Ds18b20(0xbe); //读暂存器
TMPL = Read\_Ds18b20();
TMPH = Read\_Ds18b20();
temp = TMPH;
temp <<= 8;
temp = temp | TMPL;
if(TMPH>8)
{
temp=~temp+1;
FLAG=1;
}
else FLAG=0;
tem=temp\*0.0625;
temp=tem\*100;
if((temp/10000)==0) //当高位为0时不显示0
L1602\_char(2,5,' ');
else
L1602\_char(2,5,temp/10000 + 48);
if((temp/10000)==0&&(temp/1000%10)==0) //当高位为0时不显示0
L1602\_char(2,6,' ');
else
L1602\_char(2,6,temp/1000%10 + 48);
L1602\_char(2,7,temp/100%10 + 48);
L1602\_char(2,8,0x2e);
L1602\_char(2,9,temp/10%10 + 48);
L1602\_char(2,10,temp%10 + 48);
L1602\_char(2,11,0xdf); //温度符号C前的圈
if(FLAG==1)
L1602\_char(2,4,0x2d); //输出-号
else
L1602\_char(2,4,0x2b); //输出+号
}
void main()
{
L1602\_init();
L1602\_string(1,1," DS18B20 Display");
L1602\_string(2,1," C");
while(1)
{
Trans();
}
}
|
