#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
//定义字符
typedef bit BOOL; //定义关键字
uchar i1=45,i2=45;
uchar boom=0;
sbit S1=P3^7;
sbit S2=P3^6;
sbit io = P2^0;
sbit rs = P2^6;
sbit rw = P2^5;
sbit ep = P2^7;
sbit beep=P1^5; //位定义
uchar data_byte;
uchar RH,RL,TH,TL;
/********延时模块***********/
void delay(uchar ms)// 延时子程序
{
uchar i;
while(ms--)
{
for(i = 0;i<100;i++);
}
}
void delay1()//延时8us
{
uchar i;
for(i=0;i<1;i++);
}
//延时10us
void delay2(uint i)
{
while(i--);
}
BOOL lcd_bz()//测试LCD忙碌状态
{
BOOL result=0x80;
P0=0x80;
rs = 0;
rw = 1;
ep = 1;
result = (BOOL)(P0 & 0x80);
ep = 0;
return result;
}
void write_cmd(uchar cmd)// 写指令
{
while(lcd_bz());
rs = 0;
rw = 0;
ep = 0;
P0 = cmd;
delay(1);
ep = 1;
delay(1);
ep = 0;
}
void write_addr(uchar addr)//写地址
{
write_cmd(addr|0x80); //写入第一行的首地址
}
void write_byte(uchar dat)//写字节
{
while(lcd_bz());
rs = 1;
rw=0;
ep = 0;
P0 = dat;
delay(1);
ep = 1;
delay(1);
ep = 0;
}
void lcd_init()// lcd初始化
{
rw=0;
write_cmd(0x38);//设置16*2显示
delay(1);
write_cmd(0x08);
delay(1);
write_cmd(0x01); //清零
delay(1);
write_cmd(0x06); //地址指针自加1
delay(1);
write_cmd(0x0c);
delay(1);
}
void display(uchar addr, uchar q)//addr为地址数值，q为写入数字
{
delay(10);
write_addr(addr);
write_byte(q);
delay(20);
}
//dht初始化
void start()//开始信号
{
io=1;
delay1();
io=0;
delay(25);//>18ms
io=1; //检测开始信号
delay1();//20-40us
delay1(); //4*8
delay1();
delay1();
}
uchar receive_byte()//接收一个字节
{
uchar i,temp,count;
for(i=0;i<8;i++)
{
count=2;
while((!io)&&count++)//等待50us低电平结束
delay1();
delay1();
delay1();
delay1();
temp=0;//如果时间为26~28，数据为0
if(io==1)
temp=1;// 数据为1
count=2;
while((io)&&count++);
if(count==1) break;
data_byte<<=1;
data_byte|=temp;
}
return data_byte;
}
//接受数据//
void receive()
{
uchar T_H,T_L,R_H,R_L,check,num_check,i;
uchar count;
start();//开始信号
io=1;
if(!io)//判断从机的响应信号，读取DHT11响应信号
{
count=2;
while((!io)&&count++);//DHT11高电平80us是否结束
count=2;
while((io)&&count++); //若响应信号结束，进入数据接收状态
R_H=receive_byte(); //湿度数据
R_L=receive_byte();
T_H=receive_byte();//温度数据
T_L=receive_byte();
check=receive_byte();//校验位
io=0;//数据接收完毕，将从机拉低延时50us
for(i=0;i<7;i++)
delay1();
io=1; //从机电平拉高，进入空闲状态
num_check=R_H+R_L+T_H+T_L;
if(num_check==check) //判断数据与校验位是否相同
{
RH=R_H;
RL=R_L;
TH=T_H;
TL=T_L;
check=num_check;
}
}
}
//蜂鸣器报警程序
void sound()
{
beep=~beep;
delay2(10);
delay(100);
display(0x0d,'o');
display(0x0e,'n');
}
void stop()
{
beep=1;
display(0x0d,'o');
display(0x0e,'f');
}
//主程序
void main()
{
lcd_init();//初始化lcd
delay(10);
while(1)
{
receive();
delay(100);
display(0x00,'R');//第一行显示
display(0x01,':');
display(0x02,RH/10+0x30);
display(0x03,RH%10+0x30);//湿度整数显示
display(0x04,'%');
display(0x40,'T'); //lcd第二行显示
display(0x41,':');
display(0x42,TH/10+0x30);
display(0x43,TH%10+0x30);
display(0x44,0xdf);
display(0x45,0x43);
if(RH>40)
{beep=~beep;
display(0x0d,'o');
display(0x0e,'n');}
else
beep=1;
}
}
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