51单片机测室温

谁践踏了优雅 2022-07-12 05:02 207阅读 0赞

#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*/
    }