51单片机测室温

#include <reg52.h>
 #include <intrins.h>
 #include "./delay/delay.h"
 #include <stdio.h>
 #include "1602.h"
 
 #define ok 1
 #define err 0
 
 sbit LED = P2^4;
 sbit ds = P2^3;
 bit ack = 0;

 void ds18b20_init()
 {
 	ds = 0;	//先复位，将高电平拉低
	delay_us(200);//经过880us
	delay_us(200);
	
	ds = 1;		//再拉高
	delay_us(30);//从机等待时间
	
/*	if(ds == 0)
		ack = ok;
	else
		ack = err;
*/	
	delay_us(200);
 }

 void dsl8b20_write_byte(unsigned char byte)
 {
 	unsigned char i;

	for(i = 0; i < 8; i++ )
	{
		ds = 0;
		
		_nop_();
		_nop_();

		ds = byte & 0x01;
		byte >>= 1;
	
		delay_us(30); 
		ds = 1;
	}
	delay_us(30);
 }

 bit ds_read_bit()
 {
 	bit tmp;
	ds = 1;	 //下降沿
	ds = 0;	 //	下降沿
		
	_nop_();
	_nop_();

	ds = 1;
	tmp = ds;//tmp读的越快越好

	delay_us(30);
	
	return tmp;
 }

  unsigned char ds_read_byte()
  {
  	unsigned char i,j,k;

	for(i = 0; i < 8 ; i++)
	{
		j = ds_read_bit();
		k = (j << 7) | (k >> 1); //j = j << 7; k = k >> 1; k = k + j;
	}

	return k;
  }

 void main()
 {
 	//ds18b20_init();
	//dsl8b20_write_byte(0xcc);

	unsigned int temp,b;
	unsigned char a;
	unsigned char buff[20];
	float temp_t;

	LCD_Init();
	LCD_Clear(); 

 	while(1)
	{
	/*	if(ack)
		{
			LED = 0;
		}
		else
		{
			LED = 1;
		}*/

		ds18b20_init();
		dsl8b20_write_byte(0xcc);//跳过读ROM命令
		dsl8b20_write_byte(0x44);//启动温度转换
		delay_ms(20);

		ds18b20_init();
		dsl8b20_write_byte(0xcc);
		dsl8b20_write_byte(0xbe);  //读暂存器

		a = ds_read_byte();		  //先读低八位
		b = ds_read_byte();		  //再读高八位

		temp = (b << 8) + a;
		temp_t = (float)temp * (0.0625);
		
		sprintf(buff,"Temp is %7.3f",temp_t);

		LCD_Write_String(0,0,buff);

	}
 }

#include "1602.h"
#include "./delay/delay.h"

#define CHECK_BUSY//是否使用判断忙语句条件，后面使用条件编译

sbit RS = P2^4;   //定义端口 
sbit RW = P2^5;
sbit EN = P2^6;

#define RS_CLR RS=0 
#define RS_SET RS=1

#define RW_CLR RW=0 
#define RW_SET RW=1 

#define EN_CLR EN=0
#define EN_SET EN=1

#define DataPort P0

/*------------------------------------------------
              判忙函数
------------------------------------------------*/
 bit LCD_Check_Busy(void) 
 { 
#ifdef CHECK_BUSY
 DataPort= 0xFF; 
 RS_CLR; 
 RW_SET; 
 EN_CLR; 
 _nop_(); 
 EN_SET;
 return (bit)(DataPort & 0x80);
#else
 return 0;
#endif
 }
/*------------------------------------------------
              写入命令函数
------------------------------------------------*/
 void LCD_Write_Com(unsigned char com) 
 {  
 while(LCD_Check_Busy()); //忙则等待
 RS_CLR; 
 RW_CLR; 
 EN_SET; 
 DataPort= com; 
 _nop_(); 
 EN_CLR;
 }
/*------------------------------------------------
              写入数据函数
------------------------------------------------*/
 void LCD_Write_Data(unsigned char Data) 
 { 
 while(LCD_Check_Busy()); //忙则等待
 RS_SET; 
 RW_CLR; 
 EN_SET; 
 DataPort= Data; 
 _nop_();
 EN_CLR;
 }

/*------------------------------------------------
                清屏函数
------------------------------------------------*/
 void LCD_Clear(void) 
 { 
 LCD_Write_Com(0x01); 
 delay_ms(5);
 }
/*------------------------------------------------
              写入字符串函数
------------------------------------------------*/
 void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s) 
 {     
       
 while (*s) 
 	{     
 LCD_Write_Char(x,y,*s);     
 s ++;  x++;   
 	}
 }
/*------------------------------------------------
              写入字符函数
------------------------------------------------*/
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) 
 {     
 if (y == 0) 
 	{     
 	LCD_Write_Com(0x80 + x);     
 	}    
 else 
 	{     
 	LCD_Write_Com(0xC0 + x);     
 	}        
 LCD_Write_Data( Data);  
 }
/*------------------------------------------------
              初始化函数
------------------------------------------------*/
 void LCD_Init(void) 
 {
   LCD_Write_Com(0x38);    /*显示模式设置*/ 
   delay_ms(5); 
   LCD_Write_Com(0x38); 
   delay_ms(5); 
   LCD_Write_Com(0x38); 
   delay_ms(5); 
   LCD_Write_Com(0x38);  
   LCD_Write_Com(0x08);    /*显示关闭*/ 
   LCD_Write_Com(0x01);    /*显示清屏*/ 
   LCD_Write_Com(0x06);    /*显示光标移动设置*/ 
   delay_ms(5); 
   LCD_Write_Com(0x0C);    /*显示开及光标设置*/
}