温度传感器与串口

#include <reg52.h>
#include <function.h> //详见第六章第8讲
#include <timer.h>    //详见第八章第11讲
#include <uart.h>     //详见第十章第4讲
#include <ds18b20.h>  //详见第十三章第5讲
 
u8 flag1s = 0;
void main()
{
    u32 x=1;
    u8 str[13];    
    u16 temp;
    EA = 1;  
    LED_Init();
    Start18B20();    //启动DS18B20
    TIM0_Init(1000,33);  //定时1ms，33是微调使定时精度更高，每次微调都由中断函数里的内容而决定
    ConfigUART(9600);
    while (1)
    {    
        if (flag1s) //每秒更新一次温度
        {
            flag1s = 0;
            if( TEMP_CONV(&temp,str)==1  //返回值为1代表读取温度成功
            {
                printf_str("第");
                printf_num(x);
                x++;
                printf_str("秒:");
                printf_str(str+temp_i);
                printf_str("度");
                printf_rn();       //回车换行
                temp_i=0;
 
                //以下是处理数码管显示的内容
                LedBuff[0]=LedChar[str[4]-'0'];
                LedBuff[1]=0x7F;    //显示小数点
                LedBuff[2]=LedChar[str[2]-'0'];
 
                if(str[0]=='-') //温度小于0
                {
                    if(str[1]=='0')
                    { 
                        LedBuff[3]=0xBF;   //数码管显示“-”
                        LedBuff[4]=0xFF;
                    }
                    else
                    { 
                        LedBuff[3]=LedChar[str[1]-'0'];
                        LedBuff[4]=0xBF;     //数码管显示“-”
                    }
                }
 
                else         //温度大于等于0
                { 
                    if(str[1]=='0')LedBuff[3]=0xFF; //高位不显示0
                    else LedBuff[3]=LedChar[str[1]-'0'];
 
                    if(str[0]=='0')LedBuff[4]=0xFF;  //高位不显示0
                    else LedBuff[4]=LedChar[str[0]-'0'];
                }
            }
            Start18B20();  //重新启动下一次转换
        }
    }
}
  
void TIM0_IRQHandler() interrupt 1
{ 
    static u16 tmr1s = 0;
    TH0 = T0RH;    //重新加载重载值
    TL0 = T0RL;
   
    tmr1s++;
    SEG_Scan();
    if (tmr1s >= 1000)//定时1s
    {
        tmr1s = 0;
        flag1s= 1;
    }
}
  
void InterruptUART() interrupt 4
{
    if (RI)  //接收到字节
    {
        RI = 0; //手动清零接收中断标志位                     
    }
}

3.串口打印截图

笔者上电之后，故意向开发板上的温度传感器吹热气，效果很棒

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