witam,
zaprojektowałem mój pierwszy układzik do sprawdzania temperatury i wilgotności oparty na atgmega8 (zew. kwarc 8mhz) i czujnik firmy sensirion sht11.
zlutowałem 4 dolne wyjścia, piszę to gdyż mój czujnik ma 5 wyjść(jak na zdjęciu) a nie 4 jak w dokumentacji. może tu leży problem..
problem polega na tym, że po przerobieniu sampla programu ze strony producenta z 8051 na atmege nie otrzymuje potwierdzenia odebrania czegokolwiek od czujnika.
SHTxx_Sample_Code.c
i
main
po wyświetleniu errorów na LCD otrzymuje ciąg :
-0 - przed error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
-2 - po error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
-4 - po error+=s_measure((unsigned char*) &humi_val.i,&checksum,TEMP);
proszę o pomoc bo przeszukałem już co się da i nie mam pomysłu jak to rozwiązać, a znając życie może być to banalny błąd
a czujnik podłączony tak: SCK - portD.3 i DATA portD.2
@Edit
poprawiłem delay z mS na uS i dalej nic
zaprojektowałem mój pierwszy układzik do sprawdzania temperatury i wilgotności oparty na atgmega8 (zew. kwarc 8mhz) i czujnik firmy sensirion sht11.
zlutowałem 4 dolne wyjścia, piszę to gdyż mój czujnik ma 5 wyjść(jak na zdjęciu) a nie 4 jak w dokumentacji. może tu leży problem..
problem polega na tym, że po przerobieniu sampla programu ze strony producenta z 8051 na atmege nie otrzymuje potwierdzenia odebrania czegokolwiek od czujnika.
SHTxx_Sample_Code.c
/***********************************************************************************
Project: SHTxx demo program (V2.1)
Filename: SHTxx_Sample_Code.c
Prozessor: 80C51 family
Compiler: Keil Version 6.14
Autor: MST
Copyrigth: (c) Sensirion AG
***********************************************************************************/
//#include <AT89s53.h> //Microcontroller specific library, e.g. port definitions
//#include <intrins.h> //Keil library (is used for _nop()_ operation)
#include <math.h> //Keil library
#include <stdio.h> //Keil library
typedef union
{ unsigned int i;
float f;
} value;
//----------------------------------------------------------------------------------
// modul-var
//----------------------------------------------------------------------------------
enum {TEMP,HUMI};
#define DDR_DB2 DDRD
#define PORT_DB2 PORTD
#define DATA PD2
#define DDR_DB3 DDRD
#define PORT_DB3 PORTD
#define SCK PD3
#define SET_SCK PORT_DB3 |= _BV(SCK)
#define CLR_SCK PORT_DB3 &= ~_BV(SCK)
#define SET_DATA_OUT PORT_DB2 |= _BV(DATA)
#define CLR_DATA_OUT PORT_DB2 &= ~_BV(DATA)
#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
char check(void)
{
DDRD^=0b0000100;
if(bit_is_clear(PIND, PD2))
{
DDRD^=0b0000100;
return 0;
}
else
{
DDRD^=0b0000100;
return 1;
}
}
//----------------------------------------------------------------------------------
char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
{
unsigned char i,error=0;
for (i=0x80;i>0;i/=2) //shift bit for masking
{
if (i & value)
SET_DATA_OUT; //masking value with i , write to SENSI-BUS
else
CLR_DATA_OUT;
SET_SCK; //clk for SENSI-BUS
_delay_ms(5); //pulswith approx. 5 us
CLR_SCK;
}
SET_DATA_OUT; //release DATA-line
SET_SCK; //clk #9 for ack
_delay_ms(2);
error=check(); //check ack (DATA will be pulled down by SHT11)
_delay_ms(2);
CLR_SCK;
return error; //error=1 in case of no acknowledge
}
//----------------------------------------------------------------------------------
char s_read_byte(unsigned char ack)
//----------------------------------------------------------------------------------
// reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
{
unsigned char i,val=0;
// SET_DATA_OUT; //release DATA-line
for (i=0x80;i>0;i/=2) //shift bit for masking
{ SET_SCK; //clk for SENSI-BUS
_delay_ms(2);
if (check()) val=(val | i); //read bit
_delay_ms(2);
CLR_SCK;
}
//DATA = !ack; //zastoąpione tym poniżej
if(ack)
CLR_DATA_OUT; //clear date?? //in case of "ack==1" pull down DATA-Line
else if(!ack)
SET_DATA_OUT;
//
SET_SCK; //clk #9 for ack
_delay_ms(5); //pulswith approx. 5 us
CLR_SCK;
SET_DATA_OUT; //release DATA-line
return val;
}
//----------------------------------------------------------------------------------
void s_transstart(void)
//----------------------------------------------------------------------------------
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
{
SET_DATA_OUT; CLR_SCK; //Initial state
_delay_ms(2);
SET_SCK;
_delay_ms(2);
CLR_DATA_OUT;
_delay_ms(2);
CLR_SCK;
_delay_ms(5);
SET_SCK;
_delay_ms(2);
SET_DATA_OUT;
_delay_ms(2);
CLR_SCK;
}
//----------------------------------------------------------------------------------
void s_connectionreset(void)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
{
unsigned char i;
SET_DATA_OUT; CLR_SCK; //Initial state
for(i=0;i<9;i++) //9 SCK cycles
{ SET_SCK;
_delay_ms(1);
CLR_SCK;
_delay_ms(1);
}
s_transstart(); //transmission start
}
//----------------------------------------------------------------------------------
char s_softreset(void)
//----------------------------------------------------------------------------------
// resets the sensor by a softreset
{
unsigned char error=0;
s_connectionreset(); //reset communication
error+=s_write_byte(RESET); //send RESET-command to sensor
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)
//----------------------------------------------------------------------------------
// reads the status register with checksum (8-bit)
{
unsigned char error=0;
s_transstart(); //transmission start
error=s_write_byte(STATUS_REG_R); //send command to sensor
*p_value=s_read_byte(ACK); //read status register (8-bit)
*p_checksum=s_read_byte(noACK); //read checksum (8-bit)
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_write_statusreg(unsigned char *p_value)
//----------------------------------------------------------------------------------
// writes the status register with checksum (8-bit)
{
unsigned char error=0;
s_transstart(); //transmission start
error+=s_write_byte(STATUS_REG_W);//send command to sensor
error+=s_write_byte(*p_value); //send value of status register
return error; //error>=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
//----------------------------------------------------------------------------------
// makes a measurement (humidity/temperature) with checksum
{
unsigned error=0;
unsigned int i;
s_transstart(); //transmission start
switch(mode){ //send command to sensor
case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
case HUMI : error+=s_write_byte(MEASURE_HUMI); break; //tu wywala po dwa error
default : break;
}
for (i=0;i<65535;i++) if(check()==0) break; //wait until sensor has finished the measurement
if(check()) error+=1; // or timeout (~2 sec.) is reached
*(p_value) =s_read_byte(ACK); //read the first byte (MSB)
*(p_value+1)=s_read_byte(ACK); //read the second byte (LSB)
*p_checksum =s_read_byte(noACK); //read checksum
return error;
}
/*
//----------------------------------------------------------------------------------
void init_uart()
//----------------------------------------------------------------------------------
//9600 bps @ 11.059 MHz
{SCON = 0x52;
TMOD = 0x20;
TCON = 0x69;
TH1 = 0xfd;
}
*/
//----------------------------------------------------------------------------------------
void calc_sth11(float *p_humidity ,float *p_temperature)
//----------------------------------------------------------------------------------------
// calculates temperature [°C] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [°C]
{ 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
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=t*0.01 - 40; //calc. temperature from ticks to [°C]
rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]
rh_true=(t_C-25)*(T1+T2*rh)+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]
}
//--------------------------------------------------------------------
float calc_dewpoint(float h,float t)
//--------------------------------------------------------------------
// calculates dew point
// input: humidity [%RH], temperature [°C]
// output: dew point [°C]
{ 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;
}
i
main
#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/eeprom.h> // dostęp do pamięci EEPROM
#include <my/lcd.c> //funkcje odpowiedzialne za obsluge wyswietlacza
#include <my/SHTxx_Sample_Code.c> //funkcje odpowiedzialne za obsluge czujnika
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#define temperature 0xE0 //adres zapsiu temperatury do eeprom'u
#define humidity 0xE1 //adres zapsiu wilgotnosci do eeprom'u
#define clearLCD 0x01
int temp=0;
int hum=50;
//deklaracje funkcji
void buttonMenu2Click(void);
void buttonSaveHum(void);
void buttonSaveTemp(void);
int main(void);
int buttonUp(int, int);
int buttonDown(int, int);
int main(void)
{
DDRD=0b11111111;
sbi(PORTC, 2); //przycisk
sbi(PORTC, 3); //przycisk
sbi(PORTC, 4); //przycisk
sbi(PORTC, 5); //przycisk
//ustawienie domyślnej temperatury i wilgotnosci //temp komentarz
//eeprom_write_byte((uint8_t*)temperature, temp);
//eeprom_write_byte((uint8_t*)humidity, hum);
// inicjalizacja LCD
lcd_init();
//======================================================================
//======================================================================
//======================================================================
//======================================================================
value humi_val,temp_val;
// float dew_point;
unsigned char error,checksum;
unsigned int i;
char buffer[7];
enum {TEMP,HUMI};
//reset polaczenia czujnika sht11
s_connectionreset();
while(1)
{ error=0;
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
if(error!=0) s_connectionreset(); //in case of an error: connection reset
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
write_command(clearLCD);
_delay_ms(1); //opoznienie, bez niego obcinalo pierwszy znak
write_text("Temperatura:"); // zapisz na LCD tekst temperatura
gotoxy(12,0);
sprintf(buffer, "%d", humi_val.i);//temp_val.i); //zapisanie do buffora całego stringu
write_text(buffer); //wypisanie zapisanej temp
}
//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------
for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!)
//-----------------------------------------------------------------------------------
}
return 0;
}
po wyświetleniu errorów na LCD otrzymuje ciąg :
-0 - przed error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
-2 - po error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
-4 - po error+=s_measure((unsigned char*) &humi_val.i,&checksum,TEMP);
proszę o pomoc bo przeszukałem już co się da i nie mam pomysłu jak to rozwiązać, a znając życie może być to banalny błąd
a czujnik podłączony tak: SCK - portD.3 i DATA portD.2
@Edit
poprawiłem delay z mS na uS i dalej nic