this my code jim....
/*****************************************************
This program was produced by the
CodeWizardAVR V1.24.2b Professional
Automatic Program Generator
© Copyright 1998-2004 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.ro
e-mail:office@hpinfotech.ro
Project : Monitoring humidity and temperatur
Version : 0.0
Date : 3/11/2009
Author : Ardi
Company :
Comments:
Chip type : ATmega8535
Program type : Application
Clock frequency : 11.059200 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 128
*****************************************************/
#include <mega8535.h>
#include <stdio.h>
#include <math.h>
#include <delay.h>
#include <stdlib.h>
// I2C Bus functions
#asm
.equ __i2c_port=0x18 ;PORTB
.equ __sda_bit=1
.equ __scl_bit=2
#endasm
#include <i2c.h>
// DS1307 Real Time Clock functions
#include <ds1307.h>
// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>
#define RXB8 1
#define TXB8 0
#define UPE 2
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
// Get a character from the USART Receiver
#ifndef _DEBUG_TERMINAL_IO_
#define _ALTERNATE_GETCHAR_
#pragma used+
char getchar(void)
{
char status,data;
while (1)
{
while (((status=UCSRA) & RX_COMPLETE)==0);
data=UDR;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
return data;
};
}
#pragma used-
#endif
// Write a character to the USART Transmitter
#ifndef _DEBUG_TERMINAL_IO_
#define _ALTERNATE_PUTCHAR_
#pragma used+
void putchar(char c)
{
while ((UCSRA & DATA_REGISTER_EMPTY)==0);
UDR=c;
}
#pragma used-
#endif
// Declare your global variables here
typedef union
{ unsigned int i; float f;} value;
enum {TEMP,HUMI};
sfrb PIND = 0x10;
sfrb PORTD = 0x12;
sfrb DDRD = 0x11;
#define SHT_DATA_OUT DDRD.2
#define SHT_DATA_IN PIND.2
#define SHT_SCK PORTD.3
#define HEAT_SW PIND.4 // Heater On or Off
#define noACK 0
#define ACK 1
//adr command r/w
#define STATUS_REG_W 0x06 //000 0011 0
#define STATUS_REG_R 0x07 //000 0011 1
#define MEASURE_TEMP 0x03 //000 0001 1
#define MEASURE_HUMI 0x05 //000 0010 1
#define RESET 0x1e //000 1111 0
const float C1=-4.0; // for 12 Bit
const float C2=+0.0405; // for 12 Bit
const float C3=-0.0000028; // for 12 Bit
const float T1=+0.01; // for 14 Bit @ 5V
const float T2=+0.00008; // for 14 Bit @ 5V
char lcd_buffer[33];
//SHT Functions
char SHT_WriteByte(unsigned char value);
char SHT_ReadByte(unsigned char ack);
void s_transstart(void);
void s_connectionreset(void);
char s_softreset(void);
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);
void calc_sth11(float *p_humidity ,float *p_temperature);
float calc_dewpoint(float h,float t);
char s_write_statusreg(unsigned char *p_value);
char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum);
unsigned char h,m,s;
void main(void)
{
// Declare your local variables here
value humi_val, temp_val;
unsigned char error,checksum;
float dew_point;
delay_ms(200);
s_connectionreset();
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=Out Func2=Out Func1=Out Func0=Out
// State7=T State6=T State5=T State4=T State3=0 State2=0 State1=0 State0=0
PORTA=0x00;
DDRA=0x0F;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=Out
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=0
PORTB=0x00;
DDRB=0x01;
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x34;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// USART initialization
// Communication Parameters: 8 Data, 2 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud rate: 19200
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x8E;
UBRRH=0x00;
UBRRL=0x23;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
// Analog Comparator Output: Off
ACSR=0x80;
SFIOR=0x00;
// I2C Bus initialization
i2c_init();
delay_ms(250);
// DS1307 Real Time Clock initialization
// Square wave output on pin SQW/OUT: Off
// SQW/OUT pin state: 0
rtc_init(0,0,0);
rtc_set_date(14,03,2009);
rtc_set_time(19,05,01);
// LCD module initialization
lcd_init(20);
// Setup Sensibus Pins
PORTD.3 = 0; // ClockLow
DDRD.3 = 1; // SCK is an output
PORTD.2 = 0; // Always Zero
// Toggle DDRD.2 for Data
/*
while (1)
{
s_transstart(); //transmission start
error+=SHT_WriteByte(MEASURE_TEMP); //send command to sensor
for (i=0;i<65535;i++)
if(SHT_DATA_IN==0) break; //wait until sensor has finished the measurement
if(SHT_DATA_IN) error+=1; //or timeout (~2 sec.) is reached
MSB =SHT_ReadByte(ACK); //read the first byte (MSB)
LSB =SHT_ReadByte(ACK); //read the second byte (LSB)
checksum =SHT_ReadByte(noACK); //read checksum
sprintf(lcd_buffer,"T= %u %u %u",MSB,LSB,checksum);
lcd_gotoxy(0,1);
lcd_puts(lcd_buffer);
delay_ms(500);
}
*/
while (1)
{
error=0;
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP);
error=0;
if(error!=0)
s_connectionreset();
else{
humi_val.f=(float)humi_val.i; //converts integer to float
temp_val.f=(float)temp_val.i; //converts integer to float
calc_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature
dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point
sprintf(lcd_buffer,"T:%3.1fC RH:%3.1f%%",temp_val.f,humi_val.f);
lcd_gotoxy(0,0);
lcd_puts(lcd_buffer);
rtc_get_time(&h,&m,&s) ;
lcd_gotoxy(0,1);
sprintf(lcd_buffer,"%i:%i:%i",h,m,s);
lcd_puts(lcd_buffer);
}
// Global enable interrupts
#asm("sei")
delay_ms(1000);
#asm("cli")
}
}
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
//----------------------------------------------------------------------------------
char SHT_WriteByte(unsigned char value)
{
unsigned char i,error=0;
for (i=0x80;i>0;i/=2) //shift bit for masking
{
if (i & value) SHT_DATA_OUT=0; //masking value with i , write to SENSI-BUS
else SHT_DATA_OUT=1;
SHT_SCK=1; //clk for SENSI-BUS
delay_us(5); //pulswith approx. 5 us
SHT_SCK=0;
}
SHT_DATA_OUT=0; //release DATA-line
SHT_SCK=1; //clk #9 for ack
error=SHT_DATA_IN; //check ack (DATA will be pulled down by SHT11)
SHT_SCK=0;
return error; //error=1 in case of no acknowledge
}
//----------------------------------------------------------------------------------
// reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
//----------------------------------------------------------------------------------
char SHT_ReadByte(unsigned char ack)
{
unsigned char i,val=0;
SHT_DATA_OUT=0; //release DATA-line
for (i=0x80;i>0;i/=2) //shift bit for masking
{
SHT_SCK=1; //clk for SENSI-BUS
if (SHT_DATA_IN) val=(val | i); //read bit
SHT_SCK=0;
}
SHT_DATA_OUT=ack; //in case of "ack==1" pull down DATA-Line
SHT_SCK=1; //clk #9 for ack
delay_us(5); //pulswith approx. 5 us
SHT_SCK=0;
SHT_DATA_OUT=0; //release DATA-line
return val;
}
//----------------------------------------------------------------------------------
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
//----------------------------------------------------------------------------------
void s_transstart(void)
{
SHT_DATA_OUT=0;
SHT_SCK=0; //Initial state
delay_us(1);
SHT_SCK=1;
delay_us(1);
SHT_DATA_OUT=1;
delay_us(1);
SHT_SCK=0;
delay_us(5);
SHT_SCK=1;
delay_us(1);
SHT_DATA_OUT=0;
delay_us(1);
SHT_SCK=0;
}
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
//----------------------------------------------------------------------------------
void s_connectionreset(void)
{
unsigned char i;
SHT_DATA_OUT=0; SHT_SCK=0; //Initial state
for(i=0;i<9;i++) //9 SCK cycles
{
SHT_SCK=1;
delay_us(1);
SHT_SCK=0;
}
s_transstart(); //transmission start
}
//----------------------------------------------------------------------------------
// resets the sensor by a softreset
//----------------------------------------------------------------------------------
char s_softreset(void)
{
unsigned char error=0;
s_connectionreset(); //reset communication
error+=SHT_WriteByte(RESET); //send RESET-command to sensor
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
// makes a measurement (humidity/temperature) with checksum
//----------------------------------------------------------------------------------
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
{
unsigned error=0;
unsigned int i;
s_transstart(); //transmission start
switch(mode){ //send command to sensor
case TEMP : error+=SHT_WriteByte(MEASURE_TEMP); break;
case HUMI : error+=SHT_WriteByte(MEASURE_HUMI); break;
default : break;
}
for (i=0;i<65535;i++) if(SHT_DATA_IN==0) break; //wait until sensor has finished the measurement
if(SHT_DATA_IN) error+=1; // or timeout (~2 sec.) is reached
*(p_value+1) =SHT_ReadByte(ACK); //read the first byte (MSB)
*(p_value) =SHT_ReadByte(ACK); //read the second byte (LSB)
*p_checksum =SHT_ReadByte(noACK); //read checksum
return error;
}
//----------------------------------------------------------------------------------------
// calculates temperature [°C] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [°C]
//----------------------------------------------------------------------------------------
void calc_sth11(float *p_humidity ,float *p_temperature)
{
//float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit
//float t=*p_temperature; // t: Temperature [Ticks] 14 Bit
float rh_lin; // rh_lin: Humidity linear
float rh_true; // rh_true: Temperature compensated humidity
float t_C; // t_C : Temperature [°C]
t_C=*p_temperature*0.01 - 40; //calc. temperature from ticks to [°C]
rh_lin=C3*(*p_humidity)*(*p_humidity) + C2*(*p_humidity) + C1; //calc. humidity from ticks to [%RH]
rh_true=(t_C-25)*(T1+T2*(*p_humidity))+rh_lin; //calc. temperature compensated humidity [%RH]
if(rh_true>100)rh_true=100; //cut if the value is outside of
if(rh_true<0.1)rh_true=0.1; //the physical possible range
*p_temperature=t_C; //return temperature [°C]
*p_humidity=rh_true; //return humidity[%RH]
}
//--------------------------------------------------------------------
// calculates dew point
// input: humidity [%RH], temperature [°C]
// output: dew point [°C]
//--------------------------------------------------------------------
float calc_dewpoint(float h,float t)
{
float logEx,dew_point;
logEx=0.66077+7.5*t/(237.3+t)+(log10(h)-2);
dew_point = (logEx - 0.66077)*237.3/(0.66077+7.5-logEx);
return dew_point;
}
//----------------------------------------------------------------------------------
// reads the status register with checksum (8-bit)
//----------------------------------------------------------------------------------
char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)
{
unsigned char error=0;
s_transstart(); //transmission start
error=SHT_WriteByte(STATUS_REG_R); //send command to sensor
*p_value=SHT_ReadByte(ACK); //read status register (8-bit)
*p_checksum=SHT_ReadByte(noACK); //read checksum (8-bit)
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
// writes the status register with checksum (8-bit)
//----------------------------------------------------------------------------------
char s_write_statusreg(unsigned char *p_value)
{
unsigned char error=0;
s_transstart(); //transmission start
error+=SHT_WriteByte(STATUS_REG_W);//send command to sensor
error+=SHT_WriteByte(*p_value); //send value of status register
return error; //error>=1 in case of no response form the sensor
}
Ardian 3oz^
Lebih bergaul dan terhubung dengan lebih baik. Tambah lebih banyak teman ke Yahoo! Messenger sekarang! http://id.messenger.yahoo.com/invite/
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