DH11 C language test program based on 89C52

// Function: Serial port sends temperature and humidity data at a baud rate of 9600

//MCU tutorial DH11 test program

#include

#include

typedef unsigned char  U8; // defined for unsigned 8-bits integer variable unsigned 8-bit integer variable*/

typedef signed char  S8; // defined for signed 8-bits integer variable */

typedef unsigned int  U16; // defined for unsigned 16-bits integer variable Unsigned 16-bit integer variable*/

typedef signed int  S16; //defined for signed 16-bits integer variable */

typedef unsigned long  U32; // defined for unsigned 32-bits integer variable Unsigned 32-bit integer variable*/

typedef signed long  S32; // defined for signed 32-bits integer variable */

typedef float  F32; // single precision floating point variable (32 bits) single precision floating point number (32 bits in length)

typedef double F64; // double precision floating point variable (64bits) Double precision floating point number (64-bit length)

#define uchar unsigned char

#define uint unsigned int

#define Data_0_time 4

//------------------------------------------------//

//----------------IO port definition area--------------------//

//------------------------------------------------//

sbit P2_0 = P2^0 ; //DH11

//------------------------------------------------//

//----------------Definition area--------------------//

//------------------------------------------------//

U8 U8FLAG,k;

U8 U8count,U8temp;

U8 U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;

U8 U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;

U8 U8comdata;

U8 outdata[5]; //Define the number of bytes sent

U8 indata[5];

U8 count, count_r=0;

U8 str[5]={"RS232"};

U16 U16temp1,U16temp2;

SendData(U8 *a)

{

outdata[0] = a[0];

outdata[1] = a[1];

outdata[2] = a[2];

outdata[3] = a[3];

outdata[4] = a[4];

count = 1;

SBUF=outdata[0];

}

void Delay(U16 j)

{ U8 i;

for(;j>0;j--)

{

for(i=0;i<27;i++);

}

}

void Delay_10us(void)

{

U8 i;

i--;

i--;

i--;

i--;

i--;

i--;

}

void COM(void)

{

U8 i;

for(i=0;i<8;i++)

{

U8FLAG=2;

//---------------------

P2_1=0; //T

P2_1=1; //T

//---------------------

while((!P2_0)&&U8FLAG++);

Delay_10us();

Delay_10us();

// Delay_10us();

U8temp=0;

if(P2_0)U8temp=1;

U8FLAG=2;

while((P2_0)&&U8FLAG++);

//---------------------

P2_1=0; //T

P2_1=1; //T

//---------------------

//Timeout if the for loop is exited

if(U8FLAG==1)break;

// Determine whether the data bit is 0 or 1

// If the high level is higher than the predetermined 0 high level value, the data bit is 1

U8comdata<=1;

U8comdata|=U8temp; //0

}//rof

}

//--------------------------------

//-----Humidity reading subroutine------------

//--------------------------------

//----The following variables are all global variables--------

//----High 8 bits of temperature == U8T_data_H------

//----Temperature low 8 bits == U8T_data_L------

//----Humidity high 8 bits == U8RH_data_H-----

//----Humidity lower 8 bits == U8RH_data_L-----

//----Check 8 bits == U8checkdata-----

//----Call the relevant subroutines as follows----------

//---- Delay();, Delay_10us();,COM();

//--------------------------------

void RH(void)

{

//Host pulls down 18ms

P2_0=0;

Delay(180);

P2_0=1;

//The bus is pulled high by the pull-up resistor and the host delays 20us

Delay_10us();

Delay_10us();

Delay_10us();

Delay_10us();

// Set the host as input to determine the slave response signal

P2_0=1;[page]

//Judge whether the slave has a low-level response signal. If it does not respond, it will jump out. If it responds, it will run downward.

if(!P2_0) //T !

{

U8FLAG=2;

//Judge whether the slave has sent out a low-level response signal of 80us

while((!P2_0)&&U8FLAG++);

U8FLAG=2;

//Judge whether the slave sends out a high level of 80us, if so, enter the data receiving state

while((P2_0)&&U8FLAG++);

//Data receiving status

COM();

U8RH_data_H_temp=U8comdata;

COM();

U8RH_data_L_temp=U8comdata;

COM();

U8T_data_H_temp=U8comdata;

COM();

U8T_data_L_temp=U8comdata;

COM();

U8checkdata_temp=U8comdata;

P2_0=1;

//Data validation

U8temp=(U8T_data_H_temp+U8T_data_L_temp+U8RH_data_H_temp+U8RH_data_L_temp);

if(U8temp==U8checkdata_temp)

{

U8RH_data_H=U8RH_data_H_temp;

U8RH_data_L=U8RH_data_L_temp;

U8T_data_H=U8T_data_H_temp;

U8T_data_L=U8T_data_L_temp;

U8checkdata=U8checkdata_temp;

}//fi

}//fi

}

//------------------------------------------------

//main() Function description: AT89C51 11.0592MHz serial port send

//Send temperature and humidity data, baud rate 9600

//------------------------------------------------

void main()

{

U8 i,j;

//uchar str[6]={"RS232"};

TMOD = 0x20; //Timer T1 uses working mode 2

TH1 = 253; // Set the initial value

TL1 = 253;

TR1 = 1; // Start timing

SCON = 0x50; //Working mode 1, baud rate 9600bps, receiving is allowed

ES = 1;

EA = 1; // Enable all interrupts

TI = 0;

RI = 0;

SendData(str); //Send to the serial port

Delay(1); //Delay 100US (12M crystal oscillator)

while(1)

{

//------------------------

//Call the temperature and humidity reading subroutine

RH();

//Serial port display program

//--------------------------

str[0]=U8RH_data_H;

str[1]=U8RH_data_L;

str[2]=U8T_data_H;

str[3]=U8T_data_L;

str[4]=U8checkdata;

SendData(str); //Send to the serial port

//The module data reading cycle is not likely to be less than 2S

Delay(20000);

}//elihw

}//main

void RSINTR() interrupt 4 using 2

{

U8 InPut3;

if(TI==1) //Send interrupt

{

TI=0;

if(count!=5) //5 bits of data sent

{

SBUF= outdata[count];

count++;

}

}

if(RI==1) //Receive interrupt

{

InPut3=SBUF;

indata[count_r]=InPut3;

count_r++;

RI=0;

if (count_r==5) // Receive 4 bits of data

{

//Data reception is complete.

count_r=0;

str[0]=indata[0];

str[1]=indata[1];

str[2]=indata[2];

str[3]=indata[3];

str[4]=indata[4];

P0=0;

}

}

}