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dht11在stc15程序

上面为项目文件结构，使用STC15F104E单片机在6MHz时钟频率调试成功，因为dht11对软件延时精度要求比较高，以上程序的软件延时是通过逻辑分析仪得出，不能移植与其他单片机，只能用于stc12c/stc11使用6 MHz晶振或者其它晶振使用分频产生6 MHz主时钟，或者使用stc15f10X系列无晶振单片机把主时钟调整为6MHz.

源程序1 …………………………dht11.c

#include "STC12.h"

#include "5110.h"

#include

#define uint unsigned int

#define uchar unsigned char

sbit io=P3^4;//DHT11数据端

uchar data_byte;

uchar HH,HL,TH,TL;

void delay(uchar z) //10ms @6Mhz

{

unsigned char i, j,k;

for(k=0;k

{

_nop_();

i = 59;

j = 89;

{

while (--j);

} while (--i);

}}

void delay1() //延时5us @6Mhz

{

_nop_();

}

void Delay2() //@6.000MHz 200us {

unsigned char i, j;

_nop_();

i = 2;

j = 38;

{

while (--j);

} while (--i);

}

void start()//开始信号

{

io=1;

delay(5);

io=0;

delay(2);

io=1;

}

uchar receive_byte()

{

uchar i,count;

for(i=0;i<8;)

{

while(!io)

count =0;

while(io)

{

count++;

delay1();

}

if((count>13)&&(count<17))

{

data_byte<<=1;

data_byte|=0x01;

++i;

}

if((count>3)&&(count<7))

{

data_byte<<=1;

++i;

}

return data_byte;

}

void receive()

{

uchar T_H,T_L,H_H,H_L,check,num_check;

start(); //开始信号

while(io); //读取DHT11响应信号{

Delay2();

H_H=receive_byte();

H_L=receive_byte();

T_H=receive_byte();

T_L=receive_byte();

check=receive_byte();

io=1;

num_check=H_H+H_L+T_H+T_L;

if(num_check==check) //校验数据

{

HH=H_H;

HL=H_L;

TH=T_H;

TL=T_L;

check=num_check;

}

main()

{

uchar g;

delay(50);

for(g=0;g<10;g++) //输出延时波形用于调整软件延时{

io=!io;

delay1();

}

LCD_init(); //初始化LCD模块

LCD_clear(); //清屏幕

HH=0;TH=0;HL=0;TL=0;

LCD_write_hanzi(0,0,0); //初始化屏幕

LCD_write_hanzi(2,0,1);

LCD_write_hanzi(0,2,2);

LCD_write_hanzi(2,2,3);

while(1)

{

receive();

LCD5110ShowNum(4,0,TH); //显示温度

LCD5110ShowNum(4,2,HH); //显示数据

delay(255);

HH=0;

TH=0;

HL=0;

TL=0;

}

源程序2…………………………5110-51.c

#include "STC12.h"

#include "5110.h"

#include "ziku.h"

sbit sce = P3^0; //片选

sbit res = P3^5; //复位,0复位

sbit dc = P3^1; //1写数据，0写指令

sbit sdin = P3^2; //数据

sbit sclk = P3^3; //时钟

//sbit io=P3^4;//DHT11数据端

/*--------------------------------------------

LCD_write_byte: 使用SPI接口写数据到LCD

输入参数：dt：写入的数据；

command ：写数据/命令选择；

编写日期：20130918

----------------------------------------------*/

void LCD_write_byte(unsigned char dt, unsigned char command) {

unsigned char i;

sce=0;

dc=command;

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

{

if(dt&0x80)

sdin=1;

else

sdin=0;

dt=dt<<1;

sclk=0;

sclk=1;

}

dc=1;

sce=1;

sdin=1;

}

/*---------------------------------------

LCD_init: 3310LCD初始化

编写日期：20080918

----------------------------------------- */

void LCD_init(void)

{

res=0;

delay_1ms();

res=1;

LCD_write_byte(0x21,0);//初始化Lcd,功能设定使用扩充指令LCD_write_byte(0xC0,0);//设定液晶偏置电压

LCD_write_byte(0x06,0);

LCD_write_byte(0x13,0);

LCD_write_byte(0x20,0);//使用基本指令

LCD_write_byte(0x0C,0);//设定显示模式，正常显示

}

/*-------------------------------------------

LCD_set_XY: 设置LCD坐标函数

输入参数：X：0－83 Y：0－5

编写日期：20130918

---------------------------------------------*/

void LCD_set_XY(unsigned char X, unsigned char Y)

{

LCD_write_byte(0x40 | Y, 0);// column

LCD_write_byte(0x80 | X, 0);// row

}

/*------------------------------------------

LCD_clear: LCD清屏函数

编写日期：20130918

--------------------------------------------*/

void LCD_clear(void)

{

unsigned char t;

unsigned char k;

LCD_set_XY(0,0);

for(t=0;t<6;t++)

{

for(k=0;k<84;k++)

{

LCD_write_byte(0x00,1);

}

/*---------------------------------------------

LCD_write_shu: 显示8（宽）*16（高）点阵列数字字母符号等半角类

输入参数：c：显示的字符；

编写日期：20130918

-----------------------------------------------*/

void LCD_write_shu(unsigned char row, unsigned char page,unsigned char c) //row:列page:页dd:字符

{

unsigned char i;

LCD_set_XY(row*8, page);// 列，页

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

{

LCD_write_byte(shuzi[c*16+i],1);

}

LCD_set_XY(row*8, page+1);// 列，页

for(i=8; i<16;i++)

{

LCD_write_byte(shuzi[c*16+i],1);

}

/*---------------------------------------------

LCD_write_hanzi: 显示16（宽）*16（高）点阵列汉字等半角类

输入参数：c：显示的字符；

编写日期：20130918

-----------------------------------------------*/

void LCD_write_hanzi(unsigned char row, unsigned char page,unsigned char c) //row:列page:页dd:字符

{

unsigned char i;

LCD_set_XY(row*8, page);// 列，页

for(i=0; i<16;i++)

{

LCD_write_byte(hanzi[c*32+i],1);

}

LCD_set_XY(row*8, page+1);// 列，页

for(i=16; i<32;i++)

{

LCD_write_byte(hanzi[c*32+i],1);

}

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

@f_name: void LCD5110ShowNum(u8 X,u16 Y,u32 num)

@brief: 显示一个数字

@param: x,y:起点坐标num:数值(0~2^32);

@return: None

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

//m^n函数

unsigned int mypow(unsigned char m,unsigned char n)

{

unsigned int result=1;

while(n--)result*=m;

return result;

}

void LCD5110ShowNum(unsigned char X,unsigned char Y,unsigned int num)

{

unsigned int res;

unsigned char t=0,t1=0;

res=num;

if(!num)LCD_write_shu(X,Y,0);//显示0

while(res) //得到数字长度

{

res/=10;

t++;

}

t1=t;

while(t) //显示数字

{

res=mypow(10,t-1);

LCD_write_shu(X+(t1-t),Y,(num/res)%10);//数字字符第一个在'0'之前

t--;

}

头文件1……………………………5110.h

#ifndef __5110_H__

#define __5110_H__

void LCD_init(void); //初始化

void LCD_clear(void); //清屏

void LCD_write_shu(unsigned char row, unsigned char page,unsigned char c); //显示英文与数字(x,y)

void LCD_write_hanzi(unsigned char row, unsigned char page,unsigned char c); //显示中文x:0,2,4,6

void LCD5110ShowNum(unsigned char X,unsigned char Y,unsigned int num); //显示数量y:0,2,4

#endif

头文件2……………………………………ZIKU.h

#ifndef __ziku_H__

#define __ziku_H__

unsigned char code shuzi[]={

/*-- 文字: 0 --*/