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| /\*51单片机+双DS18B20浮点数温度显示\*/
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DQ = P2^3; //DS18B20数据口
uchar FLAG=1; //正负温度标志
/\*注意这里的二维数组存放的是DS18B20序列号，
仿真前需要先对目标DS18B20的序列号读取出来，
再填写到此处才有效\*/
unsigned char code RomCode[2][8] = {0x28,0x30,0xc5,0xb8,0x00,0x00,0x00,0x8e,
0x28,0x21,0xc5,0xb8,0x00,0x00,0x00,0xe2};
//这三个引脚参考资料
sbit E=P2^2; //1602使能引脚
sbit RW=P2^1; //1602读写引脚
sbit RS=P2^0; //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)
{
P0 = del;
RS = 0;
RW = 0;
E = 0;
delay\_1();
E = 1;
delay\_1();
}
void write(uchar del)
{
P0 =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(bit k,uchar lie,char sign)
{
uchar a;
if(!k) a = 0x80;
if(k) 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(bit j,uchar lie,uchar \*p)
{
uchar a;
if(!j) a = 0x80;
if(j) 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;
}
/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/
/\* \*/
/\* 写一个字节 \*/
/\* \*/
/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/
void Witie\_Ds18b20(uchar dat)
{
uchar G=0;
for(G=0;G<8;G++)
{
DQ=0;
DQ=dat&0x01;
delay(25);
DQ=1;
dat>>=1;
}
delay(25);
}
void Trans(bit x)
{
unsigned char i,TMPH,TMPL;
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(0x55); //匹配ROM命令
for(i=0;i<8;i++)
{
Witie\_Ds18b20(RomCode[x][i]);
}
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) //当百位为0时不显示0
L1602\_char(x,9,' ');
else
L1602\_char(x,9,temp/10000 + 48);
if((temp/10000)==0&&(temp/1000%10)==0) //当十位为0时不显示0
L1602\_char(x,10,' ');
else
L1602\_char(x,10,temp/1000%10 + 48);
L1602\_char(x,11,temp/100%10 + 48);
L1602\_char(0,12,0x2e); //第一行小数点符号显示
L1602\_char(1,12,0x2e); //第二行小数点符号显示
L1602\_char(x,14,temp/10%10 + 48);
L1602\_char(x,13,temp%10 + 48);
L1602\_char(x,15,0xdf); //温度符号C前的圈
L1602\_char(x,16,'C'); //输出'C'
if(FLAG==1)
L1602\_char(x,8,0x2d); //输出-号
else
L1602\_char(x,8,0x2b); //输出+号
}
void main()
{ uchar T=0;
L1602\_init();
L1602\_string(0,1,"Temp1:");
L1602\_string(1,1,"Temp2:");
while(1)
{
// Trans(0);
// delay(30);
// Trans(1);
T++;
if(T<30)
{
Trans(0);
}else
{
Trans(1);
}
T %=60;
}
}
|
