LetAllLinesOfCodeSpeak

原创于 2019-04-22 17:36:11 发布 · 98 阅读

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本文详细解析了DHT11温湿度传感器的驱动代码实现过程，包括数据位读取、温度湿度数据接收及校验流程，为嵌入式系统中使用DHT11提供了实用的代码示例。

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/****************************************************************************************************************

*************************

*Author:JYW

*Time:2019_04_22

*Describe:LetAllLinesOfCodeSpeak

*****************************************************/

/*************************************
*Auther:JYW
*Time:2019_04_22
*Describe:代码练习DHT11的驱动练习
*********************************/
void COM(void)
{
   //首先读入的是高位
unsigned char i;
   for(i=0;i<8;i++)
   {
       ucharFLAG = 2;
       while((!DATA_PIN)&&ucharFLAG++);
       Delay_10us();
       Delay_10us();
       Delay_10us();
       uchartemp = 0;
       if(DATA_PIN) uchartemp = 1;
       ucharFLAG = 2;
       while((DATA_PIN)&&ucharFLAG++);
       if(ucharflAG = 1) break;
       ucharcomdata<<=1
       ucharcomdata |=uchartemp;
   }
}

void DHT11(void)
{
DATA_PIN = 0;
   Delay_ms(19);
   DATA_PIN = 1;
   P0DIR &= 0x7F;
   Delay_ms(10);
   Delay_ms(10);
   Delay_ms(10);
   Delay_ms(10);
   if(!DATA_PIN)
   {
   ucharFLAG = 2;
       while((!DATA_PIN)&&ucharFLAG++);
       ucharFLAG = 2;
       while((DATA_PIN)&&ucharFLAG++);
       COM();
       ucharRH_data_H_temp=ucharcomdata;
       COM();
       ucharRH_data_L_temp=ucharcomdata;
       COM();
       ucharT_data_H_temp=ucharcomdata;
       COM();
       ucharT_data_L_temp=ucharcomdata;
       COM();
       ucharcheckdata_temp=ucharcomdata;

       DATA_PIN = 1;
       uchartemp=(ucharT_data_H_temp+ucharT_data_L_temp+ucharRH_data_H_temp+ucharRH_data_L_temp);
       if(ucharcheckdata_temp == uchartemp)
       {
           ucharRH_data_H = ucharRH_data_H_temp;
           ucharRH_data_L = ucharRH_data_L_temp;
           ucharT_data_H = ucharT_data_H_temp;
           ucharT_data_L = ucharT_data_L_temp;
           ucharcheckdata = ucharcheckdata_temp;


       }
       wendu_shi = ucharT_data_H/10;
       wendu_ge = ucharT_data_H%10;

       shidu_shi = ucharRH_data_H/10;
       shidu_ge = ucharRH_data_H%10;


   }
   else
   {
   wendu_shi = 0;
       wendu_ge = 0;
       shidu_shi = 0;
       shidu_ge = 0;


   }
   P0DIR |= 0x80;

}