蓝桥杯之DS18B20

1、显示整数 

#include 
#include 
//***************定义DS18B24引脚*************
sbit DQ=P1^4;
//****************段码***********************
unsigned char code duanma[18]=
{0xc0,//0
0xcf,//1
0xa4,//2
0xb0,//3
0x99,//4
0x92,//5
0x82,//6
0xf8,//7
0x80,//8
0x90,//9
0x88,//A
0x80,//B
0xc6,//C
0xc0,//D
0x86,//E
0x8e,//F
0xbf,//-
0x7f//.
};

//***************系统初始化****************
void init_system()
{
	P2=0XA0;
	P0=0X00;
	P2=0X80;
	P0=0XFF;
	P2=0X00;
}
//*****************500us延时**********************
void Delay500us()		//@11.0592MHz
{
	unsigned char i, j;

	_nop_();
	_nop_();
	i = 6;
	j = 93;
	do
	{
		while (--j);
	} while (--i);
}
//***********************60us延时************************
void Delay60us()		//@11.0592MHz
{
	unsigned char i;

	_nop_();
	_nop_();
	i = 163;
	while (--i);
}
//**********************1us****************
void Delay1us()		//@11.0592MHz
{
	_nop_();
	_nop_();
	_nop_();
}

//**********************DS18B20初始化*************************
void init_ds()
{
	unsigned char i;
	DQ=1;
	DQ=0;
	Delay500us();
	DQ=1;
	while(DQ)
	{
		i++;
		if(i==3)
		{
			break;
		}
		Delay500us();
	}
	Delay500us();
}
//****************写入****************
void write_ds(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ=0;
		Delay1us();
		DQ=dat&0x01;
		dat>>=1;
		Delay60us();
		DQ=1;
	}
}//*******************读**********************
unsigned char read_ds()
{
	unsigned char i,temp;
	for(i=0;i<8;i++)
	{
		DQ=0;
		temp>>=1;
		DQ=1;
		Delay1us();
		if(DQ)
		{
			temp|=0x80;
		}
		Delay60us();
	}
	return temp;
}
//****************读取温度********************
unsigned char read_t()
{
	unsigned char low,high,temper;
	init_ds();
	write_ds(0xcc);
	write_ds(0x44);

	init_ds();
	write_ds(0xcc);
	write_ds(0xbe);

	low=read_ds();
	high=read_ds();

	temper=low>>4;
	temper|=high<<4;

	return temper;
}
//*********************数码管延时1毫米*****************
void Delay1ms()		//@11.0592MHz
{
	unsigned char i, j;

	_nop_();
	_nop_();
	_nop_();
	i = 11;
	j = 190;
	do
	{
		while (--j);
	} while (--i);
}
//***********************显示函数*********************
void ds(unsigned char yi,unsigned char er)
{
	P2=0XC0;
	P0=0X40;
	P2=0XE0;
	P0=duanma[yi];
	Delay1ms();

	P2=0XC0;
	P0=0X80;
	P2=0XE0;
	P0=duanma[er];
	Delay1ms();

	P2=0X00;
}
void main()
{
	unsigned char i,j,temper;
	init_system();
	while(1)
	{
		temper=read_t();
		i=temper/10;//十位
		j=temper%10;//个位
		ds(i,j);
	}
}

2、更改后，显示带小数部分

#include 
#include 
sbit DQ = P1^4;  //?????
unsigned short temp;
//****************??***********************
unsigned char code duanma[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char code duanma_dot[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
//***************?????****************
void init_system()
{
	P2=0XA0;
	P0=0X00;
	P2=0X80;
	P0=0XFF;
	P2=0X00;
}

//???????
void Delay_OneWire(unsigned int t)  //STC89C52RC
{
	unsigned char i=0;
	while(t--)
	{
		for(i=0;i<12;i++);
	}
		
}

//??????DS18B20?????
void Write_DS18B20(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(5);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(5);
}

//?DS18B20??????
unsigned char Read_DS18B20(void)
{
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
			dat |= 0x80;
		}	    
		Delay_OneWire(5);
	}
	return dat;
}

//DS18B20?????
bit init_ds18b20(void)
{
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(12);
  	DQ = 0;
  	Delay_OneWire(80);
  	DQ = 1;
  	Delay_OneWire(10); 
    initflag = DQ;     
  	Delay_OneWire(5);
  
  	return initflag;
}

//void Delay750ms()		//@11.0592MHz
//{
//	unsigned char i, j, k;

//	_nop_();
//	_nop_();
//	i = 32;
//	j = 133;
//	k = 87;
//	do
//	{
//		do
//		{
//			while (--k);
//		} while (--j);
//	} while (--i);
//}

float rd_temperature(void)
{
	unsigned char low,high;
	init_ds18b20();
	Delay_OneWire(1); 
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
  
	//Delay750ms();
	
	init_ds18b20();
	Delay_OneWire(1); 
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);

  low=  Read_DS18B20();
	high= Read_DS18B20();
	//temp=high*256+low;
	//return temp*0.0625;
	temp=high;
	temp=temp<<8;
	temp=temp|low;
	
	temp>>=4;
	temp=temp*10;
	temp=temp+(low&0x0f)*0.625;
	return temp;
}

//*********************?????1??*****************
void Delay1ms()		//@11.0592MHz
{
	unsigned char i, j;

	_nop_();
	_nop_();
	_nop_();
	i = 11;
	j = 190;
	do
	{
		while (--j);
	} while (--i);
}

//***********************????*********************
void ds()
{

	
	P2=0XC0;//com
	P0=0X80;//7
	P2=0XE0;
	P0=duanma[temp%10];
	P2=0X00;
	Delay1ms();

	P2=0XC0;
	P0=0X40;//6
	P2=0XE0;
	P0=duanma_dot[(temp%100)/10];
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X20;//5
	P2=0XE0;
	P0=duanma[temp/100];
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X10;//4
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X08;//3
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X04;//2
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X02;//1
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X01;//0
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

}

void main()
{
	//float temp;
	init_system();
	while(1)
	{
		//temp=rd_temperature();
		rd_temperature();
		//temp=temp*10;
		ds();
		
	}
}

或者

#include 
#include 
sbit DQ = P1^4;  //?????
unsigned short low,high,temp;
//****************??***********************
unsigned char code duanma[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char code duanma_dot[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
//***************?????****************
void init_system()
{
	P2=0XA0;
	P0=0X00;
	P2=0X80;
	P0=0XFF;
	P2=0X00;
}

//???????
void Delay_OneWire(unsigned int t)  //STC89C52RC
{
	unsigned char i=0;
	while(t--)
	{
		for(i=0;i<12;i++);
	}
		
}

//??????DS18B20?????
void Write_DS18B20(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(5);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(5);
}

//?DS18B20??????
unsigned char Read_DS18B20(void)
{
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
			dat |= 0x80;
		}	    
		Delay_OneWire(5);
	}
	return dat;
}

//DS18B20?????
bit init_ds18b20(void)
{
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(12);
  	DQ = 0;
  	Delay_OneWire(80);
  	DQ = 1;
  	Delay_OneWire(10); 
    initflag = DQ;     
  	Delay_OneWire(5);
  
  	return initflag;
}

//void Delay750ms()		//@11.0592MHz
//{
//	unsigned char i, j, k;

//	_nop_();
//	_nop_();
//	i = 32;
//	j = 133;
//	k = 87;
//	do
//	{
//		do
//		{
//			while (--k);
//		} while (--j);
//	} while (--i);
//}

float rd_temperature(void)
{
	//unsigned char low,high;
	init_ds18b20();
	Delay_OneWire(1); 
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
  
	//Delay750ms();
	
	init_ds18b20();
	Delay_OneWire(1); 
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);

  low=  Read_DS18B20();
	high= Read_DS18B20();
	temp=high*256+low;
	//return temp*0.0625;
	
	//temp=high*256+low*0.0625;
	
//	temp=high;
//	temp=temp<<8;
//	temp=temp|low;
//	
	temp>>=4;
	temp=temp*10;
	temp=temp+(low&0x0f)*0.625;
	return temp;
}

//*********************?????1??*****************
void Delay1ms()		//@11.0592MHz
{
	unsigned char i, j;

	_nop_();
	_nop_();
	_nop_();
	i = 11;
	j = 190;
	do
	{
		while (--j);
	} while (--i);
}

//***********************????*********************
void ds()
{

	
	P2=0XC0;//com
	P0=0X80;//7
	P2=0XE0;
	P0=duanma[temp%10];
	P2=0X00;
	Delay1ms();

	P2=0XC0;
	P0=0X40;//6
	P2=0XE0;
	P0=duanma_dot[(temp%100)/10];
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X20;//5
	P2=0XE0;
	P0=duanma[temp/100];
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X10;//4
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X08;//3
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X04;//2
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X02;//1
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

	P2=0XC0;//com
	P0=0X01;//0
	P2=0XE0;
	P0=0xff;
	P2=0X00;
	Delay1ms();

}

void main()
{
	//float temp;
	init_system();
	while(1)
	{
		//temp=rd_temperature();
		rd_temperature();
		//temp=temp*10;
		ds();
		
	}
}