电脑显示的温度计.txt

用AVR编写的点阵显示屏

				   //MCU: AT89S51
//晶振：11.0592M  (一定要用这个晶振)
#include"AT89X51.H"
#include "absacc.h"
#include "stdio.h"
#include "stdlib.h"
#include "intrins.h"

unsigned char staus=0;

unsigned int send_count; /*定时器计数变量*/


unsigned char send_data[]="现在温度是:125.0 摄氏度";



//ds18b20 part
#define  SkipRom              0xcc
#define  ConvertTemperature   0x44
#define  ReadScratchpad       0xbe
/*******************************************************************/
sbit One_Wire_Bus=P2^4;
/********************************************************************/
unsigned char GetScratchpad[2];
unsigned char code decimalH[16]={00,06,12,18,25,31,37,43,50,56,62,68,75,81,87,93};
unsigned char code decimalL[16]={00,25,50,75,00,25,50,75,00,25,50,75,00,25,50,75};
unsigned char ResultTemperatureH;
unsigned char ResultTemperatureLH,ResultTemperatureLL;
unsigned char ResultSignal;


/********1ms延时子程序***********/
delay_nms(unsigned int n)
{
 unsigned int i;
 unsigned char j;

 for(i=0;i<n;i++)
    for(j=0;j<120;j++)
	  ;     //空操作
}




/********************************************************************/
void One_Wire_Delay(unsigned char delay_time)
{ 
 while(delay_time)delay_time--;//延时时间:=(8+delay_time*6)us;
}

//*****初始化DS18B20******/
void Initize_One_Wire_Bus(void)
{ 
 One_Wire_Bus=0;
 One_Wire_Delay(80);//总线拉低 488us 
 One_Wire_Bus=1;
 //One_Wire_Delay(25);//总线拉高 158us;
 One_Wire_Delay(24);//总线拉高 152us;
}
/***********************************************************************/

/*******************读一个字节ds18b20 *********************************/
unsigned char One_Wire_Read_Byte(void)
{ 
 bit temp_bit;
 unsigned char i,result=0;
 for(i=0;i<8;i++)
 { 
  One_Wire_Bus=0;
  One_Wire_Bus=1; 
  temp_bit=One_Wire_Bus;
  //One_Wire_Delay(9);//延时 62 us
  One_Wire_Delay(8);//延时 56 us
  _nop_();
  _nop_();
  _nop_();
  if(temp_bit)
   result|=0x01<<i;
 }
 return(result);  //返回ds18b20值
 
}

/*********向ds18b20写一个字节*********************/
void One_Wire_Write_Byte(unsigned char oww_dat)
{  
 unsigned char i;
 for(i=0;i<8;i++)
 { 
  One_Wire_Bus=0;
  if(oww_dat&0x01)One_Wire_Bus=1; 
   //One_Wire_Delay(20);// 128 us
  One_Wire_Delay(19);// 122 us
  _nop_();
  _nop_();
  _nop_();
  _nop_();
  One_Wire_Bus=1;
  oww_dat>>=1;
 }
 One_Wire_Delay(10);
}
/******************************************/
void Read_18B20(void)
{ 
 unsigned char tempH,tempL;
 Initize_One_Wire_Bus();
 One_Wire_Write_Byte(SkipRom);
 _nop_();
  //There is just one DS1820 on the bus;
 One_Wire_Write_Byte(ConvertTemperature);
 One_Wire_Delay(5);
  //Start to convert temperature;
 Initize_One_Wire_Bus();
 One_Wire_Write_Byte(SkipRom);
 _nop_();
 One_Wire_Write_Byte(ReadScratchpad);
 GetScratchpad[0]=One_Wire_Read_Byte();
  //Master samples the LSB temperature from the scratchpad;
 GetScratchpad[1]=One_Wire_Read_Byte();
  //Master samples the MSB temperature from the scratchpad;
 One_Wire_Delay(120);
 tempH=(GetScratchpad[1]<<4)|(GetScratchpad[0]>>4);  
 tempL=(GetScratchpad[0]&0x0f);
 Initize_One_Wire_Bus();
  //Issue a reset to terminate left parts;
 if(tempH&0x80)
 { 
  tempH=~tempH;
  tempL=~tempL+1;
  ResultSignal=1;
  //Negative temperature;
 }
 ResultTemperatureH=tempH;
 ResultTemperatureLL=decimalL[tempL];
 ResultTemperatureLH=decimalH[tempL];
  //Result of temperature; 
}//Read the byte0 and byte1 from scratchpad;
/***********************************************************************/

void main(void)
{	
// 以下是设置中断和定时器
	PT0=1; 
	ET0=1;
//	ES=1;  //开串口接收中断
	IT0=1;IT1=1;

    TMOD=0X20;
	
// 定时器0为产生1ms的中断，
	TH0=(65535-1000)/256;
	TL0=(65535-1000)%256;
//定时器1为9600bit/s 的波特率发生器
	TL1=0xfd; //波特率发生
	TH1=0xfd;
    SCON=0xd8;
    PCON=0X00;//波特率不加倍	
// 开定时器  
	TR1=1;
	TR0=1;
	TI=1;
	EA=1;
	while(1)
	  {
	   ;
	  }
}

// 定时器0的中断服务程序，向串口发送姿态数据。
void intsvr1(void) interrupt 1
{
    TR0=0;
// 重新装入定时器0的初值；
	TH0=(65535-1000)/256;
	TL0=(65535-1000)%256;
	send_count++;
	//每4秒发送一次信息到电脑上
   if (send_count==4000)					 	// 4秒判断
     {
	  send_count=0;
	  Read_18B20();
	  
	  send_data[11]=(ResultTemperatureH/100)|0x30;  //温度百位 
	  if(send_data[11]==0x30)
	     send_data[11]=0xff; 
	  send_data[12]=((ResultTemperatureH%100)/10)|0x30;  //温度十位
	  send_data[13]=(ResultTemperatureH%10)|0x30;     //温度个位
      send_data[15]=(ResultTemperatureLH/10)|0x30;  //温度小数位
      puts(send_data);
	  puts("*************************************");
	  puts("\0");
	 // putchar(0x0d);  //回车
	 // putchar(0x0a);  //换行
	  
	  }
   TR0=1;
}