task2.c

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#include "main.h"
#include "task2.h"
#include "ds18b20.h"
float temp;
unsigned char a=0;
unsigned char b=0;
unsigned char str_temp[10];

void task2_init(void)
{
   EA = 0;
   ds18b20_init();
   WriteOneChar(0xCC); //跳过读序号列号的操作
   WriteOneChar(0xBE); //读取温度寄存器等（共可读9个寄存器） 前两个就是温度
   a=ReadOneChar();
   b=ReadOneChar();
   EA = 1;
}

//任务2
void task2()
{  
   static unsigned char i=0;   
   i++; 
   if(i==1)
   {
      EA = 0;
      ds18b20_init();
      WriteOneChar(0xCC); // 跳过读序号列号的操作
      WriteOneChar(0x44); // 启动温度转换      
      EA = 1;
   }
   else if(i>8)
   {
      EA = 0;
      ds18b20_init();
      WriteOneChar(0xCC); //跳过读序号列号的操作
      WriteOneChar(0xBE); //读取温度寄存器等（共可读9个寄存器） 前两个就是温度
      a=ReadOneChar();b=ReadOneChar();   
      //temp = (b*256+a)*6.25; //有效位到小数点后2位，适用Proteus6.9版本和实物版	
	  temp = (b*256+a)*5; //有效位到小数点后2位，适用Proteus7以上版本

      sprintf(str_temp,"%2.1f",temp/10);	  
	  str_buff1[10]	= str_temp[0];
	  str_buff1[11]	= str_temp[1];
	  str_buff1[12]	= str_temp[2];
	  str_buff1[13]	= str_temp[3];
	  str_buff1[14] = 0xdf;
	  str_buff1[15] = 'C'; 
      i = 0;
      EA = 1;
   }
   
}