#include <reg51.h>
#include <intrins.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
long temperature;
long pressure;
#define uchar unsigned char
#define uint unsigned int
#define BMP180_SlaveAddress 0xee
#define OSS 0
sbit DataPort=P0;
sbit SCL=P1^0;
sbit SDA=P1^1;
sbit Data=P3^6;
uchar rec_dat[9];
sbit lcdrs=P2^6;
sbit lcdrw=P2^5;
sbit lcden=P2^7;
typedef unsigned char BYTE;
typedef unsigned short WORD;
long pressure;
short ac1;
short ac2;
short ac3;
unsigned short ac4;
unsigned short ac5;
unsigned short ac6;
short b1;
short b2;
short mb;
short mc;
short md;
void delay(uint n)
{ uint x,y;
for(x=n;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_dat(uchar dat)
{
lcdrs=1;
P0=dat;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init_lcd()
{
lcden=0;
lcdrw=0;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
}
void DHT11_delay_us(uchar n)
{
while(--n);
}
void DHT11_delay_ms(uint z)
{
uint i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--);
}
void DHT11_start()
{
Data=1;
DHT11_delay_us(2);
Data=0;
DHT11_delay_ms(30);
Data=1;
DHT11_delay_us(30);
}
uchar DHT11_rec_byte()
{
uchar i,dat=0;
for(i=0;i<8;i++)
{
while(!Data);
DHT11_delay_us(8);
dat<<=1;
if(Data==1)
dat+=1;
while(Data);
}
return dat;
}
void DHT11_receive()
{
uchar R_H,R_L,T_H,T_L,RH,RL,TH,TL,revise;
DHT11_start();
if(Data==0)
{
while(Data==0);
DHT11_delay_us(40);
R_H=DHT11_rec_byte();
R_L=DHT11_rec_byte();
T_H=DHT11_rec_byte();
T_L=DHT11_rec_byte();
revise=DHT11_rec_byte();
DHT11_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;
}
rec_dat[0]='0'+(RH/10);
rec_dat[1]='0'+(RH%10);
rec_dat[2]='R';
rec_dat[3]='H';
rec_dat[4]=' ';
rec_dat[5]=' ';
rec_dat[6]='0'+(TH/10);
rec_dat[7]='0'+(TH%10);
rec_dat[8]='C';
}
}
void DisplayOneChar(uchar X,uchar Y,uchar DData)
{
Y&=1;
X&=15;
if(Y)X|=0x40;
X|=0x80;
write_com(X);
write_dat(DData);
}
void Delay5us()
{
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
}
void Delay5ms()
{
WORD n = 560;
while (n--);
}
void BMP180_Start()
{
SDA = 1;
SCL = 1;
Delay5us();
SDA = 0;
Delay5us();
SCL = 0;
}
void BMP180_Stop()
{
SDA = 0;
SCL = 1;
Delay5us();
SDA = 1;
Delay5us();
}
void BMP180_SendACK(bit ack)
{
SDA = ack;
SCL = 1;
Delay5us();
SCL = 0;
Delay5us();
}
bit BMP180_RecvACK()
{
SCL = 1;
Delay5us();
CY = SDA;
SCL = 0;
Delay5us();
return CY;
}
void BMP180_SendByte(BYTE dat)
{
BYTE i;
for (i=0; i<8; i++)
{
dat <<= 1;
SDA = CY;
SCL = 1;
Delay5us();
SCL = 0;
Delay5us();
}
BMP180_RecvACK();
}
BYTE BMP180_RecvByte()
{
BYTE i;
BYTE dat = 0;
SDA = 1;
for (i=0; i<8; i++)
{
dat <<= 1;
SCL = 1;
Delay5us();
dat |= SDA;
SCL = 0;
Delay5us();
}
return dat;
}
short Multiple_read(uchar ST_Address)
{
uchar msb, lsb;
short _data;
BMP180_Start();
BMP180_SendByte(BMP180_SlaveAddress);
BMP180_SendByte(ST_Address);
BMP180_Start();
BMP180_SendByte(BMP180_SlaveAddress+1);
msb = BMP180_RecvByte();
BMP180_SendACK(0);
lsb = BMP180_RecvByte();
BMP180_SendACK(1);
BMP180_Stop();
Delay5ms();
_data = msb << 8;
_data |= lsb;
return _data;
}
long bmp180ReadTemp(void)
{
BMP180_Start();
BMP180_SendByte(BMP180_SlaveAddress);
BMP180_SendByte(0xF4);
BMP180_SendByte(0x2E);
BMP180_Stop();
delay(10);
return (long) Multiple_read(0xF6);
}
long bmp180ReadPressure(void)
{
long pressure ;
BMP180_Start();
BMP180_SendByte(BMP180_SlaveAddress);
BMP180_SendByte(0xF4);
BMP180_SendByte(0x34);
BMP180_Stop();
delay(10);
pressure = Multiple_read(0xF6);
pressure &= 0x0000FFFF;
return pressure;
}
void Init_BMP180()
{
ac1 = Multiple_read(0xAA);
ac2 = Multiple_read(0xAC);
ac3 = Multiple_read(0xAE);
ac4 = Multiple_read(0xB0);
ac5 = Multiple_read(0xB2);
ac6 = Multiple_read(0xB4);
b1 = Multiple_read(0xB6);
b2 = Multiple_read(0xB8);
mb = Multiple_read(0xBA);
mc = Multiple_read(0xBC);
md = Multiple_read(0xBE);
}
void bmp180Convert()
{
long ut;
long up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
ut = bmp180ReadTemp();
ut = bmp180ReadTemp();
up = bmp180ReadPressure();
up = bmp180ReadPressure();
x1 = ((long)ut - ac6) * ac5 >> 15;
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
temperature = (b5 + 8) >> 4;
b6 = b5 - 4000;
x1 = (b2 * (b6 * b6 >> 12)) >> 11;
x2 = ac2 * b6 >> 11;
x3 = x1 + x2;
b3 = (((long)ac1 * 4 + x3) + 2)/4;
x1 = ac3 * b6 >> 13;
x2 = (b1 * (b6 * b6 >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (ac4 * (unsigned long) (x3 + 32768)) >> 15;
b7 = ((unsigned long) up - b3) * (50000 >> OSS);
if (b7 < 0x80000000)
p = (b7<<1)/b4;
else
p = (b7/b4)<<1;
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
pressure = 2*(p + ((x1 + x2 + 3791) >> 4));
DisplayOneChar(0,1,pressure/100000+48);
DisplayOneChar(1,1,pressure%100000/10000+48);
DisplayOneChar(2,1,pressure%10000/1000+48);
DisplayOneChar(3,1,'.');
DisplayOneChar(4,1,pressure%1000/100+48);
DisplayOneChar(5,1,'K');
DisplayOneChar(6,1,'p');
}
void main()
{
uchar i;
init_lcd();
Init_BMP180();
while(1)
{
DHT11_delay_ms(100);
DHT11_receive();
write_com(0x80);
for(i=0;i<9;i++)
write_dat(rec_dat[i]);
bmp180Convert();
delay(100);
}
}
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