仿真时LCD一直显示DHT11采集的数据为0,求大神解决一下

ID:1068800 · 发表于 2023-3-28 21:15

请问是因为没采集到数据吗，还是时序问题呀纯小白QAQ

DHT11代码：
#include"reg52.h"
#include"DHT11.h"
#include"delay.h"
#include <intrins.h>
sbit  DHT11_DQ=P3^7;

bit status;

void delay_10us(unsigned int nus)
{
      unsigned char i;

      i = 2*nus;
      while (--i);
}

void DHT11_Rst(void)
{
      DHT11_DQ=0;
      delay_ms(20);
      DHT11_DQ=1;
      delay_10us(4);
}

bit DHT11_Check(void)
{
      unsigned char retry=0;

      while(DHT11_DQ&&retry<100)
      {
            retry++;
            delay_10us(1);
      };
      if(retry>=100)return 1;
      else retry=0;
      while(!DHT11_DQ&&retry<100)
      {
            retry++;
            delay_10us(1);
      };
      if(retry>=100)return 1;
               return 0;

}

bit DHT11_Init(void)
{
      DHT11_Rst() ;
      return DHT11_Check();
}

static unsigned char DHT11_Read_Byte(void)
{
      unsigned char retry, dat = 0, i;
      status = OK;
      for(i = 8; i > 0; i--)
      {

            dat <<= 1;
            retry = 0;

            whileT11_DQ == 0 && retry++ < NUMBER);
            if(retry >= NUMBER)
            {
                     status = ERROR;
                     return 0;
            }

            delay_10us(2);

            if(DHT11_DQ != 0)
            {

                     dat++;

                     while(DHT11_DQ != 0 && retry++ < NUMBER)
                     {
                              DHT11_DQ = 1;
                     }
                     if(retry >= NUMBER)
                     {
                              status = ERROR;
                              return 0;
                     }
            }
      }
      return (dat);

bit DHT11_Read_Date(unsigned char *temp,unsigned char *humi)
{
      unsigned char i = 0,retry = 0;
      unsigned char buf[SIZE];
      DHT11_DQ = 0;
      delay_ms(30);
      DHT11_DQ = 1;

      delay_10us(3);
      if(DHT11_DQ != 0)
      {
            //??ó|′eD?o?
            return ERROR;
      }
      else
      {

            while(DHT11_DQ == 0 && retry++ < NUMBER);
            if(retry >= NUMBER)
            {
                     DHT11_DQ = 1;
                     return ERROR;
            }
            retry = 0;
            DHT11_DQ = 1;

            while(DHT11_DQ != 0 && retry++ < NUMBER);
            if(retry >= NUMBER)
            {
                     DHT11_DQ = 1;
                     return ERROR;
            }


         for(i = 0; i < SIZE; i++)
            {
                     buf[ i] = DHT11_Read_Byte();
                     if(status == ERROR)
                     {
                              DHT11_DQ = 1;
                              return ERROR;
                     }
            }
            if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
            {
                     *humi = buf[0];
                     *temp = buf[2];
                     DHT11_DQ = 1;
                     return OK;
            }
            else
            {

                     return ERROR;
            }
      }
}

主函数
void main()
{
      unsigned char temperature;
      unsigned char humidity;
      Time0_Time1_init();
      lcd1602_init();
      led= 1;
      delay_ms(1000);
      L1602_string(1,1,"WD:");
      L1602_string(1,8,"SD:");
      L1602_string(1,6,"C");
      L1602_string(1,13,"%");
      L1602_string(2,3,":");
      L1602_string(2,6,":");
      L1602_string(2,12,":");
      while(1)
      {
            DHT11_Read_Date(&temperature,&humidity);
            delay_ms(50);

            L1602_int(1,4,temperature);
            L1602_int(1,11,humidity);

            if(key1==0
            {
                     buf++;
                     if(buf>1) buf=0;
            }

            if(buf==0
            {
                     L1602_string(1,15,"SD");
                     if(key2==0) led=~led;
                     if(key3==0) q1=~q1;
                     if(key4==0) q2=~q2;
                     if(temperature>40) q2=1;
            }


            if(buf==1
            {
                     L1602_string(1,15,"ZD");
                     if(key4==0) miao++;
                     if(key5==0) fen++;
                     if(key6==0) shi++;
                     if(key3==0) shi1++;  if(shi1>23) shi1=0;
                     if(key2==0) fen1++;  if(fen1>59) fen1=0;

                     if((shi==shi1)&(fen==fen1)
                     {
                              if(humidity>70) led=q1=q2=0;

                     }
                     if(temperature>40|humidity<35
                     led=q1=q2=1;
            }
            L1602_int(2,1,shi);
            L1602_int(2,4,fen);
            L1602_int(2,7,miao);

            L1602_int(2,10,shi1);
            L1602_int(2,13,fen1);

            delay_ms(150);
      }
}

void Timer0() interrupt 1
{
TH0=(65536-50000)/256；
TL0=(65536-50000)%256；
count++；
if(count==20
      {
count=0
            miao++;
            if(miao>59)
            {
                     miao=0;
                     fen++;
            }
            if(fen>59)
            {
                     fen=0;
                     shi++;
            }
            if(shi>23) shi=0;
  }
}

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