www.pudn.com > temperature.rar > main.c

#define GPGCON (*(volatile unsigned *)0x56000060)     //18b20寄存器设置 
#define GPGDAT (*(volatile unsigned *)0x56000064)  
#define GPGUP (*(volatile unsigned *)0x56000068)  
  
#define UFCON0     (*(volatile unsigned *)0x50000008)   //串口寄存器设置 
#define UMCON0     (*(volatile unsigned *)0x5000000c) 
#define ULCON0     (*(volatile unsigned *)0x50000000)	 
#define UCON0      (*(volatile unsigned *)0x50000004) 
#define UBRDIV0    (*(volatile unsigned *)0x50000028) 
#define UTRSTAT0   (*(volatile unsigned *)0x50000010) 
#define UTXH0 		(*(volatile unsigned*)0x50000020) 
#define URXH0 		(*(volatile unsigned*)0x50000024) 
    
 
unsigned char wd[4];   
unsigned int sdata;//测量到的温度的整数部分 
unsigned char xiaoshu1;//小数第一位 
unsigned char xiaoshu2;//小数第二位 
unsigned char xiaoshu;//两位小数 
 
void zh(unsigned char wdata); 
void Delay(unsigned int x) ; 
void uart(void); 
void DS18B20PRO(void); 
void dmsec (unsigned int t); 
void tmreset (void); 
unsigned char tmrbit (void); 
unsigned char tmrbyte (void) ; 
void tmwbyte (unsigned char dat); 
void tmstart (void) ; 
void tmrtemp (void) ; 
 
int Main(void)                       //不停循环检测温度值，并转换为asc||码，通过串口传出来 
{   
    GPGUP&= 0xffffff1f;  
    while(1) 
    	{   
          DS18B20PRO();          
          zh(sdata); 
          uart(); 
          Delay(30);                      
	    } 
    
  return(0);  
}  
 
void dmsec (unsigned int t)       //精确延时函数   
 {    
	unsigned int i; 
    unsigned int j; 
    j=1*t; 
    for(i = 0; i < j; i++); 
 }  
          
void tmreset (void)       //18b20初始化 
{   unsigned int i;                             
     
	GPGCON&=0xfffffffc;    //设置寄存器对18b20进行写操作 
	GPGCON|=0x01; 
	 
	GPGDAT|=0x01; 
    dmsec(100); 
 
	GPGDAT&=0xfffe;      
	dmsec(600); 
   
       	  
	GPGDAT|=0x01; 
	 
	dmsec(100); 
	GPGCON&=0xfffffffc;     //设置寄存器对18b20进行读操作 
	i=GPGDAT; 
	//if(i&0x01)    
}              
 
 
 
unsigned char tmrbyte (void)        //读一个字节函数 
  {    
     unsigned int j;               
	 unsigned char i,u=0;       
	        
	 for (i=1;i<=8;i++)       
	 { 
	  GPGCON&=0xfffffffc; 
	  GPGCON|=0x01; 
	          
	  GPGDAT&=0xfffe;  
	  u >>= 1; 
	  GPGDAT|=0x01; 
	   
	  GPGCON&=0xfffffffc; 
	  j=GPGDAT; 
	  if(j&0x01)  u |= 0x80; 
	   
	  dmsec(36); 
	      
	 }         
	 return (u);        
   
} 
          
void tmwbyte (unsigned char dat)     //写一个字节函数 
{                        
	 unsigned char j;       
	  
	 GPGCON&=0xfffffffc; 
	 GPGCON|=0x01;        
	 for (j=1;j<=8;j++)       
	 {  
	   GPGDAT&=0xfffe; 
	   dmsec(1);       
	   GPGDAT|= (dat & 0x01);   
	   dmsec(47); 
	   GPGDAT|=0x01;    
	  dat = dat >> 1;       
	  
   }         
}  
 
  
void tmstart (void)         //发送ds1820 开始转换 
  {                           
 	tmreset();             //复位     
 	dmsec(120);            //延时     
 	tmwbyte(0xcc);         //跳过序列号命令    
 	tmwbyte(0x44);         //发转换命令 44H, 
  }          
 
 
 
 
void tmrtemp (void)       //读取温度 
    {                           
		unsigned char a,b;  
		tmreset ();      //复位      
		dmsec (200);     //延时      
		tmwbyte (0xcc);  //跳过序列号命令    
		tmwbyte (0xbe);  //发送读取命令      
		a = tmrbyte ();  //读取低位温度     
		b = tmrbyte ();  //读取高位温度            
		 
		sdata = a/16+b*16;      //整数部分 
		 
		xiaoshu1 = (a&0x0f)*10/16;    //小数第一位 
		xiaoshu2 = (a&0x0f)*100/16%10;//小数第二位 
		xiaoshu=xiaoshu1*10+xiaoshu2; //小数两位 
}  
 
void zh(unsigned char wdata)//将温度值转换为ascii值 
{ 
   
  wd[0]=wdata / 10+0x30; 
  wd[1]=wdata % 10+0x30;  
  wd[2]=xiaoshu / 10+0x30; 
  wd[3]=xiaoshu % 10+0x30; 
}  
 
 
void DS18B20PRO(void)          
{     
  tmstart();  // uart(10);      
  dmsec(5); 	//如果是不断地读取的话可以不延时 // 
  tmrtemp(); 	//读取温度,执行完毕温度将存于TMP中 // 
}									   
 
 
        
void uart()               //串口函数用于发送温度值 
{	 
	 
    UFCON0 = 0x0; 
    UMCON0 = 0x0; 
    ULCON0 = 0x3;   
    UCON0  = 0x245;   
    UBRDIV0=( (int)(50000000/16/115200+0.5) -1 ); 
  	 
    	while(!(UTRSTAT0 & 0x2)); 
		UTXH0='\n'; 
		while(!(UTRSTAT0 & 0x2));             
		UTXH0=wd[0]; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=wd[1]; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=46; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=wd[2]; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=wd[3]; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=39; 
		while(!(UTRSTAT0 & 0x2)); 
		UTXH0=67; 
} 
 
void Delay(unsigned int x)         
{  
  unsigned int i,j,k;  
  for(i=0;i<=x;i++)  
    for(j=0;j<0xff;j++)  
      for(k=0;k<0xff;k++);  
}