STC89C52RC单片机读取DHT11在1602上面显示乱码求帮助 -

标题: STC89C52RC单片机读取DHT11在1602上面显示乱码求帮助 [打印本页]

作者: JT341125 时间: 2019-11-23 10:26
标题: STC89C52RC单片机读取DHT11在1602上面显示乱码求帮助
#include <reg52.h>
#include <stdio.h>
#include <intrins.h>

#define uchar unsigned char
#define uint  unsigned int

#define DataPort P0

bit ReadTempFlag;
bit ReadRHFlag;
bit ReadVFlag;

sbit RS = P2^4;
sbit RW = P2^5;
sbit EN = P2^6;
sbit DQ=P3^3;
sbit DHT=P3^6;
char dat_t[4],dat_v[4],dat_s[4];
bit ReadTmpFlag,ReadRHFlag,OVERFLOWFLAG;

void Delay_Us(unsigned char t)
{
while(--t);
}

void Delay_Ms(unsigned char t)
{
while(t--)
{
   Delay_Us(245);
      Delay_Us(245);
}
}

bit Init_DS18B20(void)
{
bit dat=0;
DQ = 1;
Delay_Us(5);
DQ = 0;
Delay_Us(200);
Delay_Us(200);
DQ = 1;
Delay_Us(50);
dat=DQ;
Delay_Us(25);
return dat;
}

unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
{
  DQ = 0;
  dat>>=1;
  DQ = 1;
  if(DQ)
dat|=0x80;
  Delay_Us(25);
}
return(dat);
}

void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
  DQ = 0;
  DQ = dat&0x01;
  Delay_Us(25);
  DQ = 1;
  dat>>=1;
}
Delay_Us(25);
}

unsigned int ReadTemperature(void)
{
unsigned char a=0;
unsigned int b=0;
unsigned int t=0;
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0x44);
Delay_Ms(10);
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0xBE);
a=ReadOneChar();
b=ReadOneChar();

b<<=8;
t=a+b;

return(t);
}

void DHT_Start()
{
      DHT = 1;
      Delay_Us(2);
      DHT = 0;
      Delay_Ms(30);
      DHT = 1;
      Delay_Us(30);
}

uchar DHT_rec_byte()
{
uchar i,dat=0;
  for(i=0;i<8;i++)
{
   while(!DHT);
      Delay_Us(8);
   dat<<=1;
   if(DHT==1)
      dat+=1;
   while(DHT);
}
return dat;
}

void DHT_receive()
{
      uchar R_H,R_L,T_H,T_L,RH,RL,TH,TL,revise;
      DHT_Start();
      if(DHT == 0)
      {
            while(DHT == 0);
            Delay_Us(40);
            R_H = DHT_rec_byte();
            R_L = DHT_rec_byte();
            T_H = DHT_rec_byte();
            T_H = DHT_rec_byte();
            revise = DHT_rec_byte();

            Delay_Us(25);

            if((R_H+R_L+T_H+T_L)==revise)
            {
                     RH = R_H;
                     RL = R_L;
                     TH = T_H;
                     TL = T_L;
            }

            dat_s[0] = '0' + (RH/10);
            dat_s[1] = '0' + (RH%10);
            dat_s[2] = '0' + (TH/10);
            dat_s[3] = '0' + (TH%10);
      }
}

bit LCD_Check_Busy(void)
{
DataPort= 0xFF;
RS=0;
RW=1;
EN=0;
_nop_();
EN=1;
return (bit)(DataPort & 0x80);
}

void LCD_Write_Com(unsigned char com)
{
Delay_Ms(5);
RS=0;
RW=0;
EN=1;
DataPort= com;
_nop_();
EN=0;
}

void LCD_Write_Data(unsigned char dt)
{
Delay_Ms(5);
RS=1;
RW=0;
EN=1;
DataPort= dt;
_nop_();
EN=0;
}

void LCD_Clear(void)
{
LCD_Write_Com(0x01);
Delay_Ms(5);
}

void LCD_Write_String(uchar ad,uchar *s)
{
      LCD_Write_Com(ad);
      while (*s)
      {
      LCD_Write_Data( *s);
      s ++;
      }
}

void LCD_Write_Char(uchar ad,uchar Data)
{
      LCD_Write_Com(ad);
      LCD_Write_Data( Data);
}

void LCD_Init(void)
{
LCD_Write_Com(0x38); /*ÏÔê¾Ä￡ê½éèÖÃ*/
Delay_Ms(5);
LCD_Write_Com(0x38);
Delay_Ms(5);
LCD_Write_Com(0x38);
Delay_Ms(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); /*ÏÔê¾1Ø±Õ*/
LCD_Write_Com(0x01); /*ÏÔê¾ÇåÆá*/
LCD_Write_Com(0x06); /*ÏÔê¾1a±êòÆ¶ˉéèÖÃ*/
Delay_Ms(5);
LCD_Write_Com(0x0C); /*ÏÔê¾¿a¼°1a±êéèÖÃ*/
}

void Init_Timer1(void)
{
TMOD |= 0x10;
EA=1;
ET1=1;
TR1=1;
}

void Init_Timer0(void)
{
      TMOD= 0x10|0x04;
      EA = 1;
      ET0=1;
      TR0 = 1;
}

void main()
{
      int Tmp,v;
      float Temp;
      LCD_Init();
      Delay_Ms(20);
      LCD_Clear();

      Init_Timer1();
      while(1)
      {
            if(ReadTmpFlag == 1)
            {
                     ReadTmpFlag = 0;
                     Tmp = ReadTemperature();
                     Temp=(float)Tmp*0.0625;
                     sprintf(dat_t,"%2.0f",Temp);
                     LCD_Write_String(0x80,dat_t);
         LCD_Write_Char(0x82,0xDF);
                     LCD_Write_Char(0x83,'C');
            }

            if(ReadRHFlag ==1)
            {
                              Init_Timer0();
                     ReadRHFlag = 0;
                     if((dat_s[2]==dat_t[0])&&(dat_s[3]==dat_t[1]))
                     {
                              LCD_Write_Char(0xC0,dat_s[0]);
                              LCD_Write_Char(0xC1,dat_s[1]);
                              LCD_Write_Char(0xC2,'%');
                     }
                     else
                     {
                              LCD_Write_String(0x86,"Error");
                              LCD_Write_Char(0x8b,dat_s[0]);
                              LCD_Write_Char(0x8c,dat_s[1]);
                              LCD_Write_Char(0x8e,dat_s[2]);
                              LCD_Write_Char(0x8f,dat_s[3]);
                     }
            }

            if(ReadVFlag==1)
            {
                     ReadVFlag = 0;
                     v = v*5;                      //1s
                     sprintf(dat_v,"%2.0f",dat_v);
                     LCD_Write_String(0xC5,dat_v);
                     LCD_Write_String(0xCA,"m/s");
                     TR0=1;
                     ET0=1;
            }
      }
}

void Timer0() interrupt 1
{
      OVERFLOWFLAG;
      TH0 = 0;
      TL0 = 0;
}

void Timer1() interrupt 3
{
      static uint counter,c,d;
      counter++;
      TH0 = (65536-10000)/256;
      TL0 = (65536-10000)%256;
      if(counter == 10)
      {
            counter = 0;
            c++;
            d++;
            ReadTmpFlag = 1;
      }
      if(c == 5)
      {
            c = 0;
            ReadRHFlag =1;
      }
      if(d == 20)//2000ms=2s
      {
            ET0 =1;
            TR0 = 1;
            ReadVFlag =1;
            TH0 = 0x00;
            TL0 = 0x00;
      }
      if(counter == 22)
      {
            c =0;
            TR0=0;
            ET0=0;
      }
}

1574425962217.jpg (4.86 MB, 下载次数: 35)

作者: wc86110 时间: 2019-11-23 21:20
看似开发板端口未正确设置才产生的结果

作者: JT341125 时间: 2019-11-24 11:08

wc86110 发表于 2019-11-23 21:20
看似开发板端口未正确设置才产生的结果

有时可以显示温湿度，但大部分显示不了

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