ds18b20温度传感C语言程序、LCD1602显示

程序主体
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
extern TemperatuerResult(); //声明引用外部函数extern unsigned int idata Temperature;
sbit lcd_e=P2^7;
sbit lcd_rs=P2^6;
sbit lcd_rw=P2^5;
void delay_ms(uchar i) //延时毫秒
{
int j;
for(i;i>0;i--)
for(j=110;j>0;j--);
}
bit lcd_check() //检测忙
{
bit result;
lcd_rs=0;
lcd_rw=1;
lcd_e=1;
delay_ms(1);
result=(bit)(P0&0x80);
lcd_e=0;
return (result);
}
void write_cmd(uchar cmd) //向lcd写命令
{
while(lcd_check());
lcd_rs=0;
delay_ms(1);
lcd_rw=0;
delay_ms(1);
P0=cmd;
delay_ms(1);
lcd_e=1;
delay_ms(1);
lcd_e=0;
}
void write_data(uchar shuju) //向lcd写数据
{
while(lcd_check());
lcd_rs=1;
delay_ms(1);
lcd_rw=0;
delay_ms(1);
P0=shuju;
delay_ms(1);
lcd_e=1;
delay_ms(1);
lcd_e=0;
}
void lcd_init() //初始化
{
delay_ms(15);
write_cmd(0x38);
delay_ms(5);
write_cmd(0x0c);
delay_ms(5);
write_cmd(0x06);
delay_ms(5);
write_cmd(0x01);
}
void display(uchar i,uchar j,uchar shuju) //在指定位置显示{
write_cmd(0x80+j*0x40+i);
delay_ms(1);
write_data(shuju);
delay_ms(1);
}
void main()
{
lcd_init();
while(1)
{
TemperatuerResult();
display(0,0,'T');
display(1,0,'e');
display(2,0,'m');
display(3,0,'p');
display(4,0,'e');
display(5,0,'r');
display(6,0,'a');
display(7,0,'t');
display(8,0,'u');
display(9,0,'r');
display(10,0,'e');
display(11,0,' ');
display(12,0,'i');
display(13,0,'s');
display(0,1,(Temperature/16%10000/1000+0x30));
display(1,1,(Temperature/16%1000/100+0x30));
display(2,1,(Temperature/16%100/10+0x30));
display(3,1,(Temperature/16%10+0x30));
display(4,1,'.');
display(5,1,(Temperature*10/16%10+0x30));
display(6,1,'`');
display(7,1,'C');
}
}
温度采集子程序
/*************************此部分为18B20的驱动程序*************************************/
#include <reg52.H>
#include <intrins.h>
sbit D18B20=P3^7;
#define NOP() _nop_() /* 定义空指令*/
#define _Nop() _nop_() /*定义空指令*/
bit flag;
unsigned int idata Temperature;
unsigned char idata temp_buff[9]; //存储读取的字节，read scratchpad为9字节，read rom ID 为8字节
unsigned char idata id_buff[8];
unsigned char idata *p,TIM;
unsigned char idata crc_data;
//************************************************************
void TempDelay (unsigned char idata us)
{
while(us--);
}
//************************************************************
void Init18b20 (void)
{
D18B20=1;
_nop_();
D18B20=0;
TempDelay(80); //delay 530 uS//80
_nop_();
D18B20=1;
TempDelay(14); //delay 100 uS//14
_nop_();
_nop_();
_nop_();
if(D18B20==0)
flag = 1; //detect 1820 success!
else
flag = 0; //detect 1820 fail!
TempDelay(20); //20
_nop_();
_nop_();
D18B20 = 1;
}
//************************************************************ void WriteByte (unsigned char idata wr) //单字节写入
{
unsigned char idata i;
for (i=0;i<8;i++)
{
D18B20 = 0;
_nop_();
D18B20=wr&0x01;
TempDelay(3); //delay 45 uS //5
_nop_();
_nop_();
D18B20=1;
wr >>= 1;
}
}
//************************************************************ unsigned char ReadByte (void) //读取单字节
{
unsigned char idata i,u=0;
for(i=0;i<8;i++)
{
D18B20 = 0;
u >>= 1;
D18B20 = 1;
if(D18B20==1)
u |= 0x80;
TempDelay (2);
_nop_();
}
return(u);
}
//************************************************************ void read_bytes (unsigned char j)
{
unsigned char idata i;
for(i=0;i<j;i++)
{
*p = ReadByte();
p++;
}
}
//************************************************************ void TemperatuerResult(void)
{
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0x44); //Temperature convert
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0xbe); //read Temperature
p = temp_buff;
read_bytes (2);
Temperature = temp_buff[1]*0x100 + temp_buff[0];
TempDelay(1);
}。