main.c
来自「基于DTH11+LCD温湿度采集」· C语言 代码 · 共 326 行
C
326 行
#include <reg51.h>
#define LCD_DB P1
unsigned char s1[5];
unsigned char s2[5];
sbit LCD_RS=P2^4;
sbit LCD_RW=P2^5;
sbit LCD_E=P2^6;
sbit P2_0=P2^0;
sbit moshi=P2^1;
sbit INC=P2^2;
sbit DEC=P2^3;
sbit SPK=P2^7;/******定义函数****************/
#define uchar unsigned char
#define uint unsigned int typedef unsigned char U8;/*无符号8位整型变量*/
typedef unsigned int U16;/* 无符号16位整型变量*/
uchar count1=95,count2=35;
uchar moshicount=0; uchar TD=0;//定时次数
U8 U8FLAG; 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; void LCD_init(void);//初始化函数
void LCD_write_command(uchar command);//写指令函数
void LCD_write_data(uchar dat);
//写数据函数void LCD_disp_char(uchar x, uchar y,uchar dat); //在某个屏幕位置上显示一个字符,X（0-16),y(1-2) void delay_n40us(uint n);//延时函数
/*******液晶初始化函数***************/
void LCD_init(void){LCD_write_command(0x38); //设置8位格式，2行，5x7
LCD_write_command(0x0c);//整体显示，关光标，不闪烁
LCD_write_command(0x06);//设定输入方式，增量不移位
LCD_write_command(0x03);//清除屏幕显示
delay_n40us(100);}/*******定时器初始化函数**********/
void timerinit()
{ TMOD=0x01;
TH0=-50000/256;
TL0=-50000%256; EA=1;
ET0=1;
}/********写指令函数************/
void LCD_write_command(uchar dat){ LCD_DB=dat;
LCD_RS=0;//指令
LCD_RW=0;//写入
LCD_E=1;//允许
delay_n40us(1);
LCD_E=0;
delay_n40us(1);
}/********写数据函数*************/
void LCD_write_data(uchar dat)
{ LCD_DB=dat; LCD_RS=1;//数据
LCD_RW=0;//写入
LCD_E=1;//允许
delay_n40us(1);
LCD_E=0; delay_n40us(1);}/*******显示一个字符函数*********/
void LCD_disp_char(uchar x,uchar y,uchar dat)
{ uchar address;
if(y==1) address=0x80+x;
else address=0xc0+x; LCD_write_command(address);
LCD_write_data(dat);
}/********延时函数***************/
void delay_n40us(uint n)
{ uint i; uchar j;
for(i=n;i>0;i--) for(j=0;j<2;j++);
}
void Delay_10us(void)
{ U8 i;
i--;
i--;
i--;
i--;
i--;
i--;
}void Delay(U16 j) {
U8 i; for(;j>0;j--) for(i=0;i<27;i++);
} /*******一字节数据传送函数*********/
void COM(void)
{
U8 i; for(i=0;i<8;i++)
{ U8FLAG=2;
while((!P2_0)&&U8FLAG++);
Delay_10us();
Delay_10us();
Delay_10us();
U8temp=0; if(P2_0)U8temp=1;
U8FLAG=2;
while((P2_0)&&U8FLAG++);//超时则跳出for循环
if(U8FLAG==1)break;//判断数据位是0还是1,如果高电平高过预定0高电平值则数据位为1 U8comdata<<=1;
U8comdata|=U8temp;
}
}/*******单片机与传感器通信函数*********/
void RH(void)
{
//主机拉低18ms
P2_0=0;
Delay(180);
P2_0=1;
//总线由上拉电阻拉高 主机延时20us
Delay_10us();
Delay_10us();
Delay_10us();
Delay_10us();
//主机设为输入 判断从机响应信号
P2_0=1;
//判断从机是否有低电平响应信号 如不响应则跳出，响应则向下运行
if(!P2_0) //T !
{
U8FLAG=2;
//判断从机是否发出 80us 的低电平响应信号是否结束
while((!P2_0)&&U8FLAG++);
U8FLAG=2;
//判断从机是否发出 80us 的高电平，如发出则进入数据接收状态
while((P2_0)&&U8FLAG++);
//数据接收状态
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;
//数据校验
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
s1[0]=(char)(0X30+U8RH_data_H/10); //湿度整数部分
s1[1]=(char)(0X30+U8RH_data_H%10);//湿度小数部分 s1[2]=(char)(0X30+U8RH_data_L/10);//温度整数部分 s2[0]=(char)(0X30+U8T_data_H/10); s2[1]=(char)(0X30+U8T_data_H%10);//温度小数部分
s2[2]=(char)(0X30+U8T_data_L/10);
}//fi
}
/***液晶显示函数***/
void disp()
{ LCD_disp_char(0,1,'s'); LCD_disp_char(1,1,'h');
LCD_disp_char(2,1,'i');
LCD_disp_char(3,1,'d');
LCD_disp_char(4,1,'u');
LCD_disp_char(5,1,':');
LCD_disp_char(6,1,s1[0]);
LCD_disp_char(7,1,s1[1]);
LCD_disp_char(8,1,'.');
LCD_disp_char(9,1,s1[2]);
LCD_disp_char(10,1,'%');
LCD_disp_char(11,1,'R');
LCD_disp_char(12,1,'H');
LCD_disp_char(14,1,s1[3]);
LCD_disp_char(15,1,s1[4]);
LCD_disp_char(0,2,'w');
LCD_disp_char(1,2,'e');
LCD_disp_char(2,2,'n');
LCD_disp_char(3,2,'d');
LCD_disp_char(4,2,'u');
LCD_disp_char(5,2,':');
LCD_disp_char(6,2,s2[0]);
LCD_disp_char(7,2,s2[1]);
LCD_disp_char(8,2,'.');
LCD_disp_char(9,2,s2[2]);
LCD_disp_char(10,2,0xDF);
LCD_disp_char(11,2,'C');
LCD_disp_char(14,2,s2[3]);
LCD_disp_char(15,2,s2[4]);
}/*****阈值设置函数****/
void shezhi()
{ //初值 s1[3]=(char)(0X30+count1/10);
s1[4]=(char)(0X30+count1%10);
//初值 s2[3]=(char)(0X30+count2/10);
s2[4]=(char)(0X30+count2%10);
moshi=1;
if(moshi==0)
{
Delay_10us();
while(moshi==0);
moshicount++;
} switch(moshicount)
{ case 1:
{ INC=1;
DEC=1;
if(INC==0)
{ Delay_10us();
while(INC==0);
count1++;
} else if(DEC==0)
{ Delay_10us();
while(DEC==0);
count1--;
}
LCD_disp_char(14,1,s1[3]);
LCD_disp_char(15,1,s1[4]);
LCD_disp_char(14,2,s2[3]);
LCD_disp_char(15,2,s2[4]);
}break;
case 2:
{//moshicount=0;
INC=1;DEC=1;
if(INC==0)
{ Delay_10us();
while(INC==0);
count2++;
}
else if(DEC==0)
{
Delay_10us();
while(DEC==0);
count2--;
} LCD_disp_char(14,1,s1[3]);
LCD_disp_char(15,1,s1[4]);
LCD_disp_char(14,2,s2[3]);
LCD_disp_char(15,2,s2[4]);
}break;
case 3: { moshicount=0; LCD_disp_char(14,1,' ');
LCD_disp_char(15,1,' ');
LCD_disp_char(14,2,' ');
LCD_disp_char(15,2,' ');
}break;
default :break;
}} /*****蜂鸣器报警程序******/void laba()
{
if((U8RH_data_H>=count1)||(U8T_data_H>=count2))
SPK=1;
else SPK=0;
} /*****定时器0中断程序，每次定时50ms****/
timer0() interrupt 1
{ TD++;
if(TD>=100)
{ TH0=-50000/256;
TL0=-50000%256;
TR0=0;
TD=0;
} TH0=-50000/256;
TL0=-50000%256;
}/*********主函数*****************/
void main(void)
{ LCD_init();
timerinit();
Delay(4);
while(1)
{
RH();
disp();
laba();
TR0=1;
while((TD>=1)&&(TD<=100))
{shezhi();
}
}
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