ATNEL tech-forum

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T19:50:55+01:00

wchpikus napisał(a):

szczerze to nie sprawdzałem wysokości, nie miałem potrzeby.

Chodzi mi o prawidłowe zapisanie w C wzoru na wysokość n.p.m., aby kompilator nie krzyczał.

Statystyki: Napisane przez avrfun — 22 gru 2015, o 19:50

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T19:44:32+01:00

szczerze to nie sprawdzałem wysokości, nie miałem potrzeby.
Ciśnienie działa ok.

Statystyki: Napisane przez wchpikus — 22 gru 2015, o 19:44

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T19:27:07+01:00

anonimowy napisał(a):

Podstawy matematyki, mnożenie to dzielenie przez odwrotność. 1/0.0000225577 = 44330.7606715, więc blisko 44330, które jest zapisane jako mnożenie. Nie wiem, czy jest to wartość dokładniejsza, czy autor biblioteki się pomylił -nie zaglądałem do dokumentacji.

Dziekuję.
Czy mógłbyś wspomóc mnie w " C prawidłowym" zapisaniu wzoru do wyliczania wysokości (jak w pierwszym poście). Próbuję zapisać go na różne sposoby bez powodzenia, a problem jest najpewniej w rzutowaniu. Komunikaty kompilatora to np. invalid operands to binary / (have 'long int (*)(void)' and 'long int').

Statystyki: Napisane przez avrfun — 22 gru 2015, o 19:27

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T17:34:49+01:00

avrfun napisał(a):

Napisz proszę skąd pochodzi wartość /0.0000225577 (we wzorze jest: 44330*)

Statystyki: Napisane przez anonimowy — 22 gru 2015, o 17:34

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T16:36:59+01:00

wchpikus napisał(a):

Nie zapomnij o bibliotekach:
#include
#include

Ok. Dzięki.
Reasumując tworzę następujące pliki biblioteczne:
BMP085.c i BMP085.h np. w folderze BMP085 (obsługa czujnika)
i2cmaster.c i i2cmaster.h w foderze BMP085_I2CFLEURYPATH, który jest inkludowany w BMP085.c (obsługa I2C)
Czy dobrze to rozumiem?

Statystyki: Napisane przez avrfun — 22 gru 2015, o 16:36

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T15:28:18+01:00

Nie zapomnij o bibliotekach:
#include
#include

Statystyki: Napisane przez wchpikus — 22 gru 2015, o 15:28

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T13:30:56+01:00

wchpikus napisał(a):

Podsyłam pliki, jest to od BMP085, ale powinna biblioteka pasować.
Może są rożne adresy, trzeba sprawdzić w specyfikacji..

Wielkie dzięki!
Jak tylko wrócę do domu wieczorkiem to odpalę bibliotekę i dam znać.
Pozdrawiam

Statystyki: Napisane przez avrfun — 22 gru 2015, o 13:30

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T11:54:00+01:00

Podsyłam pliki, jest to od BMP085, ale powinna biblioteka pasować.
Może są rożne adresy, trzeba sprawdzić w specyfikacji..

BMP085.c

[syntax=c]/*
bmp085 lib 0x01
copyright (c) Davide Gironi, 2012
Released under GPLv3.
Please refer to LICENSE file for licensing information.
*/

#include
#include
#include
#include
#include
#include

#include "bmp085.h"

//variables
static int bmp085_regac1, bmp085_regac2, bmp085_regac3, bmp085_regb1, bmp085_regb2, bmp085_regmb, bmp085_regmc, bmp085_regmd;
static unsigned int bmp085_regac4, bmp085_regac5, bmp085_regac6;
static long bmp085_rawtemperature, bmp085_rawpressure;

//path to i2c fleury lib
#include BMP085_I2CFLEURYPATH

/*
* i2c write
*/
void bmp085_writemem(uint8_t reg, uint8_t value) {
i2c_start_wait(BMP085_ADDR | I2C_WRITE);
i2c_write(reg);
i2c_write(value);
i2c_stop();
}

/*
* i2c read
*/
void bmp085_readmem(uint8_t reg, uint8_t buff[], uint8_t bytes) {
uint8_t i =0;
i2c_start_wait(BMP085_ADDR | I2C_WRITE);
i2c_write(reg);
i2c_rep_start(BMP085_ADDR | I2C_READ);
for(i=0; iif(i==bytes-1)
buff[i] = i2c_readNak();
else
buff[i] = i2c_readAck();
}
i2c_stop();
}

#if BMP085_FILTERPRESSURE == 1
#define BMP085_AVARAGECOEF 21
static long k[BMP085_AVARAGECOEF];
long bmp085_avaragefilter(long input) {
uint8_t i=0;
long sum=0;
for (i=0; ik[i] = k[i+1];
}
k[BMP085_AVARAGECOEF-1] = input;
for (i=0; isum += k[i];
}
return (sum /BMP085_AVARAGECOEF) ;
}
#endif

/*
* read calibration registers
*/
void bmp085_getcalibration(void) {
uint8_t buff[2];
memset(buff, 0, sizeof(buff));

bmp085_readmem(BMP085_REGAC1, buff, 2);
bmp085_regac1 = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGAC2, buff, 2);
bmp085_regac2 = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGAC3, buff, 2);
bmp085_regac3 = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGAC4, buff, 2);
bmp085_regac4 = ((unsigned int)buff[0] <<8 | ((unsigned int)buff[1]));
bmp085_readmem(BMP085_REGAC5, buff, 2);
bmp085_regac5 = ((unsigned int)buff[0] <<8 | ((unsigned int)buff[1]));
bmp085_readmem(BMP085_REGAC6, buff, 2);
bmp085_regac6 = ((unsigned int)buff[0] <<8 | ((unsigned int)buff[1]));
bmp085_readmem(BMP085_REGB1, buff, 2);
bmp085_regb1 = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGB2, buff, 2);
bmp085_regb2 = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGMB, buff, 2);
bmp085_regmb = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGMC, buff, 2);
bmp085_regmc = ((int)buff[0] <<8 | ((int)buff[1]));
bmp085_readmem(BMP085_REGMD, buff, 2);
bmp085_regmd = ((int)buff[0] <<8 | ((int)buff[1]));
}

/*
* get raw temperature as read by registers, and do some calculation to convert it
*/
void bmp085_getrawtemperature(void) {
uint8_t buff[2];
memset(buff, 0, sizeof(buff));
long ut,x1,x2;

//read raw temperature
bmp085_writemem(BMP085_REGCONTROL, BMP085_REGREADTEMPERATURE);
_delay_ms(5); // min. 4.5ms read Temp delay
bmp085_readmem(BMP085_REGCONTROLOUTPUT, buff, 2);
ut = ((long)buff[0] << 8 | ((long)buff[1])); //uncompensated temperature value

//calculate raw temperature
x1 = ((long)ut - bmp085_regac6) * bmp085_regac5 >> 15;
x2 = ((long)bmp085_regmc << 11) / (x1 + bmp085_regmd);
bmp085_rawtemperature = x1 + x2;
}

/*
* get raw pressure as read by registers, and do some calculation to convert it
*/
void bmp085_getrawpressure(void) {
uint8_t buff[3];
memset(buff, 0, sizeof(buff));
long up,x1,x2,x3,b3,b6,p;
unsigned long b4,b7;

#if BMP085_AUTOUPDATETEMP == 1
bmp085_getrawtemperature();
#endif

//read raw pressure
bmp085_writemem(BMP085_REGCONTROL, BMP085_REGREADPRESSURE+(BMP085_MODE << 6));
_delay_ms(2 + (3<bmp085_readmem(BMP085_REGCONTROLOUTPUT, buff, 3);
up = ((((long)buff[0] <<16) | ((long)buff[1] <<8) | ((long)buff[2])) >> (8-BMP085_MODE)); // uncompensated pressure value

//calculate raw pressure
b6 = bmp085_rawtemperature - 4000;
x1 = (bmp085_regb2* (b6 * b6) >> 12) >> 11;
x2 = (bmp085_regac2 * b6) >> 11;
x3 = x1 + x2;
b3 = (((((long)bmp085_regac1) * 4 + x3) << BMP085_MODE) + 2) >> 2;
x1 = (bmp085_regac3 * b6) >> 13;
x2 = (bmp085_regb1 * ((b6 * b6) >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (bmp085_regac4 * (uint32_t)(x3 + 32768)) >> 15;
b7 = ((uint32_t)up - b3) * (50000 >> BMP085_MODE);
p = b7 < 0x80000000 ? (b7 << 1) / b4 : (b7 / b4) << 1;
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
bmp085_rawpressure = p + ((x1 + x2 + 3791) >> 4);

#if BMP085_FILTERPRESSURE == 1
bmp085_rawpressure = bmp085_avaragefilter(bmp085_rawpressure);
#endif
}

/*
* get celsius temperature
*/
int16_t bmp085_gettemperature(void) {
bmp085_getrawtemperature();
/*long x1, x2;
x1 = ((bmp085_rawtemperature - bmp085_regac6) * bmp085_regac5) >> 15;
x2 = (bmp085_regmc << 11) / (x1 + bmp085_regmd);
return (((x1 + x2 + 8) >> 4) - 32.0f) / 1.8f;
*/
long temperature = ((bmp085_rawtemperature + 8)>>4);
//temperature = temperature;
return (temperature);
}

/*
* get pressure
*/
long bmp085_getpressure(void) {
bmp085_getrawpressure();
return (bmp085_rawpressure + BMP085_UNITPAOFFSET);
}

/*
* get altitude
*/
int16_t bmp085_getaltitude(void) {
bmp085_getrawpressure();
return (((1 - pow(bmp085_rawpressure/(double)101325, 0.1903 )) / 0.0000225577) + BMP085_UNITMOFFSET);
}

/*
* init bmp085
*/
void bmp085_init(void) {
bmp085_getcalibration(); //get calibration data
bmp085_getrawtemperature(); //update raw temperature, at least the first time

#if BMP085_FILTERPRESSURE == 1
//initialize the avarage filter
uint8_t i=0;
for (i=0; ibmp085_getrawpressure();
}
#endif
}[/syntax]

BMP085.h

[syntax=c]/*
bmp085 lib 0x01
copyright (c) Davide Gironi, 2012
Released under GPLv3.
Please refer to LICENSE file for licensing information.
References:
- this library is a porting of the bmp085driver 0.4 ardunio library
http://code.google.com/p/bmp085driver/
Notes:
- to compile with avrgcc you may define -lm flag for some math functions
*/

#ifndef BMP085_H_
#define BMP085_H_

#include
#include

#ifdef __cplusplus
extern "C" {
#endif

#define BMP085_ADDR (0x77<<1) //0x77 default I2C address

#define BMP085_I2CFLEURYPATH "../I2C/i2cmaster.h" //define the path to i2c fleury lib
#define BMP085_I2CINIT 0 //init i2c

//registers
#define BMP085_REGAC1 0xAA
#define BMP085_REGAC2 0xAC
#define BMP085_REGAC3 0xAE
#define BMP085_REGAC4 0xB0
#define BMP085_REGAC5 0xB2
#define BMP085_REGAC6 0xB4
#define BMP085_REGB1 0xB6
#define BMP085_REGB2 0xB8
#define BMP085_REGMB 0xBA
#define BMP085_REGMC 0xBC
#define BMP085_REGMD 0xBE
#define BMP085_REGCONTROL 0xF4 //control
#define BMP085_REGCONTROLOUTPUT 0xF6 //output 0xF6=MSB, 0xF7=LSB, 0xF8=XLSB
#define BMP085_REGREADTEMPERATURE 0x2E //read temperature
#define BMP085_REGREADPRESSURE 0x34 //read pressure

//modes
#define BMP085_MODEULTRALOWPOWER 0 //oversampling=0, internalsamples=1, maxconvtimepressure=4.5ms, avgcurrent=3uA, RMSnoise_hPA=0.06, RMSnoise_m=0.5
#define BMP085_MODESTANDARD 1 //oversampling=1, internalsamples=2, maxconvtimepressure=7.5ms, avgcurrent=5uA, RMSnoise_hPA=0.05, RMSnoise_m=0.4
#define BMP085_MODEHIGHRES 2 //oversampling=2, internalsamples=4, maxconvtimepressure=13.5ms, avgcurrent=7uA, RMSnoise_hPA=0.04, RMSnoise_m=0.3
#define BMP085_MODEULTRAHIGHRES 3 //oversampling=3, internalsamples=8, maxconvtimepressure=25.5ms, avgcurrent=12uA, RMSnoise_hPA=0.03, RMSnoise_m=0.25

//autoupdate temperature enabled
#define BMP085_AUTOUPDATETEMP 1 //autoupdate temperature every read

//setup parameters
#define BMP085_MODE BMP085_MODESTANDARD //define a mode
#define BMP085_UNITPAOFFSET 0 //define a unit offset (pa)
#define BMP085_UNITMOFFSET 0 //define a unit offset (m)

//avarage filter
#define BMP085_FILTERPRESSURE 1 //avarage filter for pressure

//functions
void bmp085_init(void);
long bmp085_getpressure(void);
int16_t bmp085_getaltitude(void);
int16_t bmp085_gettemperature(void);
#ifdef __cplusplus
}
#endif
#endif[/syntax]

Działa tylko z biblioteka I2C:
[syntax=c]#ifndef _I2CMASTER_H
#define _I2CMASTER_H 1
/*************************************************************************
* Title: C include file for the I2C master interface
* (i2cmaster.S or twimaster.c)
* Author: Peter Fleury http://jump.to/fleury
* File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
* Target: any AVR device
* Usage: see Doxygen manual
**************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif

#ifdef DOXYGEN
/**
@defgroup pfleury_ic2master I2C Master library
@code #include @endcode

@brief I2C (TWI) Master Software Library
Basic routines for communicating with I2C slave devices. This single master
implementation is limited to one bus master on the I2C bus.
This I2c library is implemented as a compact assembler software implementation of the I2C protocol
which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
Since the API for these two implementations is exactly the same, an application can be linked either against the
software I2C implementation or the hardware I2C implementation.
Use 4.7k pull-up resistor on the SDA and SCL pin.

Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
i2cmaster.S to your target when using the software I2C implementation !

Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
@note
The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
to GNU assembler and AVR-GCC C call interface.
Replaced the incorrect quarter period delays found in AVR300 with
half period delays.

@author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
@par API Usage Example
The following code shows typical usage of this library, see example test_i2cmaster.c
@code
#include
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
int main(void)
{
unsigned char ret;
i2c_init(); // initialize I2C library
// write 0x75 to EEPROM address 5 (Byte Write)
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_write(0x75); // write value 0x75 to EEPROM
i2c_stop(); // set stop conditon = release bus
// read previously written value back from EEPROM address 5
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
ret = i2c_readNak(); // read one byte from EEPROM
i2c_stop();
for(;;);
}
@endcode
*/
#endif /* DOXYGEN */

/**@{*/

#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
#endif

#include

/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_READ 1

/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_WRITE 0

/**
@brief initialize the I2C master interace. Need to be called only once
@param void
@return none
*/
extern void i2c_init(void);

/**
@brief Terminates the data transfer and releases the I2C bus
@param void
@return none
*/
extern void i2c_stop(void);

/**
@brief Issues a start condition and sends address and transfer direction

@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_start(unsigned char addr);

/**
@brief Issues a repeated start condition and sends address and transfer direction
@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_rep_start(unsigned char addr);

/**
@brief Issues a start condition and sends address and transfer direction

If device is busy, use ack polling to wait until device ready
@param addr address and transfer direction of I2C device
@return none
*/
extern uint8_t i2c_start_wait(unsigned char addr);

/**
@brief Send one byte to I2C device
@param data byte to be transfered
@retval 0 write successful
@retval 1 write failed
*/
extern unsigned char i2c_write(unsigned char data);

/**
@brief read one byte from the I2C device, request more data from device
@return byte read from I2C device
*/
extern unsigned char i2c_readAck(void);

/**
@brief read one byte from the I2C device, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_readNak(void);

/**
@brief read one byte from the I2C device

Implemented as a macro, which calls either i2c_readAck or i2c_readNak

@param ack 1 send ack, request more data from device

0 send nak, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_read(unsigned char ack);
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();

#define TWBR_CALC(speed) ( (F_CPU / speed) - 16UL ) / 2UL
#define SLA_W(address) (address << 1)
#define SLA_R(address) ((address << 1) + 0x01)

void twi_init(uint8_t twbr_value);
void twistart(void);
void twistop(void);
void twiwrite(uint8_t data);
uint8_t twiread(uint16_t ack);

#ifdef __cplusplus
}
#endif

/**@}*/
#endif[/syntax]

[syntax=c]/*************************************************************************
* Title: I2C master library using hardware TWI interface
* Author: Peter Fleury http://jump.to/fleury
* File: $Id: twimaster.c,v 1.3 2005/07/02 11:14:21 Peter Exp $
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
* Target: any AVR device with hardware TWI
* Usage: API compatible with I2C Software Library i2cmaster.h
**************************************************************************/
#include
#include
#include
#include "i2cmaster.h"

/* I2C clock in Hz */
#define SCL_CLOCK 400000L

/*************************************************************************
Initialization of the I2C bus interface. Need to be called only once
*************************************************************************/
void i2c_init(void)
{
/* initialize TWI clock: 100 kHz clock, TWPS = 0 => prescaler = 1 */

TWSR = 0; /* no prescaler */
TWBR = (uint8_t)(((F_CPU/SCL_CLOCK)-16)/2); /* must be > 10 for stable operation */

}/* i2c_init */

uint8_t i2c_sync(void){
uint16_t timeout = 100;
while(!(TWCR & (1<_delay_us(1);
timeout--;
}
return timeout != 0;
}

uint8_t i2c_waitStop(void){
uint16_t timeout = 100;
while((TWCR & (1<_delay_us(1);
timeout--;
}
return timeout != 0;
}
/*************************************************************************
Issues a start condition and sends address and transfer direction.
return 0 = device accessible, 1= failed to access device
*************************************************************************/
unsigned char i2c_start(unsigned char address)
{
uint8_t twst;

// send START condition
TWCR = (1<
// wait until transmission completed (this is stupid!!)
if(!i2c_sync()) return 0;

// check value of TWI Status Register. Mask prescaler bits.
twst = TW_STATUS & 0xF8;
if ( (twst != TW_START) && (twst != TW_REP_START)) return 1;

// send device address
TWDR = address;
TWCR = (1<
// wail until transmission completed and ACK/NACK has been received
if(!i2c_sync()) return 0;

// check value of TWI Status Register. Mask prescaler bits.
twst = TW_STATUS & 0xF8;
if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;

return 0;

}/* i2c_start */

/*************************************************************************
Issues a start condition and sends address and transfer direction.
If device is busy, use ack polling to wait until device is ready

Input: address and transfer direction of I2C device
*************************************************************************/
uint8_t i2c_start_wait(unsigned char address)
{
uint8_t twst;

int retry = 2000;
while ( 1 )
{
// send START condition
TWCR = (1<
// wait until transmission completed
if(!i2c_sync()) break;

// check value of TWI Status Register. Mask prescaler bits.
twst = TW_STATUS & 0xF8;
if ( (twst != TW_START) && (twst != TW_REP_START)) continue;

// send device address
TWDR = address;
TWCR = (1<
// wail until transmission completed
if(!i2c_sync()) break;

// check value of TWI Status Register. Mask prescaler bits.
twst = TW_STATUS & 0xF8;
if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) )
{
/* device busy, send stop condition to terminate write operation */
TWCR = (1<
// wait until stop condition is executed and bus released
if(!i2c_waitStop()) continue;

if(!(retry --)) break;
continue;
}
return 1;
//if( twst != TW_MT_SLA_ACK) return 1;
break;
}
return 0;
}/* i2c_start_wait */

/*************************************************************************
Issues a repeated start condition and sends address and transfer direction
Input: address and transfer direction of I2C device

Return: 0 device accessible
1 failed to access device
*************************************************************************/
unsigned char i2c_rep_start(unsigned char address)
{
return i2c_start( address );

}/* i2c_rep_start */

/*************************************************************************
Terminates the data transfer and releases the I2C bus
*************************************************************************/
void i2c_stop(void)
{
/* send stop condition */
TWCR = (1<
// wait until stop condition is executed and bus released
i2c_waitStop();

}/* i2c_stop */

/*************************************************************************
Send one byte to I2C device

Input: byte to be transfered
Return: 0 write successful
1 write failed
*************************************************************************/
unsigned char i2c_write( unsigned char data )
{
uint8_t twst;

// send data to the previously addressed device
TWDR = data;
TWCR = (1<
// wait until transmission completed
i2c_sync();

// check value of TWI Status Register. Mask prescaler bits
twst = TW_STATUS & 0xF8;
if( twst != TW_MT_DATA_ACK) return 1;
return 0;

}/* i2c_write */

/*************************************************************************
Read one byte from the I2C device, request more data from device

Return: byte read from I2C device
*************************************************************************/
unsigned char i2c_readAck(void)
{
TWCR = (1<i2c_sync();
return TWDR;
}/* i2c_readAck */

/*************************************************************************
Read one byte from the I2C device, read is followed by a stop condition

Return: byte read from I2C device
*************************************************************************/
unsigned char i2c_readNak(void)
{
TWCR = (1<i2c_sync();
//uart_puts("Adana odczytana z pamieci= ");uart_putnrhex(TWDR);uart_puts("\r\n");
return TWDR;
}/* i2c_readNak */

void twi_init(uint8_t twbr_value)
{
//TWSR = 0x00;
TWBR = twbr_value;
}

void twistart(void)
{
TWCR = (1<while (!(TWCR & (1<}

void twistop(void)
{
TWCR = (1<while ((TWCR & (1<}

void twiwrite(uint8_t data)
{
TWDR = data;
TWCR = (1<while (!(TWCR & (1<}

uint8_t twiread(uint16_t ack) // nack 0
{
TWCR = ack ?
((1 << TWINT) | (1 << TWEN) | (1 << TWEA))
: ((1 << TWINT) | (1 << TWEN)) ;

while (!(TWCR & (1<return TWDR;
}

/*
void scan(void)
{
uart_puts_P("Scanning for devices on i2c bus ...\r\n\n");

for(uint8_t s = 0; s <= 0x7F; s++)
{
twistart();
twiwrite(SLA_W(s));

if(TW_STATUS == TW_MT_SLA_ACK )
{
uart_puts_P("Found device at address - 0x");
uart_put_hex(s);
uart_puts_P(" (<< 1 for SLA_W) \t 0b");
uart_putintr(s, 2);
uart_puts_P(" 0\r\n");

}
twistop();
}
}*/[/syntax]

Statystyki: Napisane przez wchpikus — 22 gru 2015, o 11:54

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T09:29:12+01:00

wchpikus napisał(a):

return ((1 - pow(bmp085_rawpressure/(double)101325, 0.1903 )) / 0.0000225577) + BMP085_UNITMOFFSET;

Dziękuję bardzo.
Napisz proszę skąd pochodzi wartość /0.0000225577 (we wzorze jest: 44330*) oraz co dodajesz do wyniku (BMP085_UNITMOFFSER)?
Pozdrawiam

P.S. Czy jest to biblioteka ze strony: https://github.com/mkschreder/martink/b ... s/bmp085.c i czy działa z czujnikiem BMP180?

Statystyki: Napisane przez avrfun — 22 gru 2015, o 09:29

Re: BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T08:34:00+01:00

Ja mam w bibliotece tak:

[syntax=c]/*
* get altitude
*/
int16_t bmp085_getaltitude(void) {
bmp085_getrawpressure();
return ((1 - pow(bmp085_rawpressure/(double)101325, 0.1903 )) / 0.0000225577) + BMP085_UNITMOFFSET;
}[/syntax]

[syntax=c]void bmp085_getrawpressure(void) {
uint8_t buff[3];
memset(buff, 0, sizeof(buff));
long up,x1,x2,x3,b3,b6,p;
unsigned long b4,b7;

#if BMP085_AUTOUPDATETEMP == 1
bmp085_getrawtemperature();
#endif

//read raw pressure
bmp085_writemem(BMP085_REGCONTROL, BMP085_REGREADPRESSURE+(BMP085_MODE << 6));
_delay_ms(2 + (3<bmp085_readmem(BMP085_REGCONTROLOUTPUT, buff, 3);
up = ((((long)buff[0] <<16) | ((long)buff[1] <<8) | ((long)buff[2])) >> (8-BMP085_MODE)); // uncompensated pressure value

//calculate raw pressure
b6 = bmp085_rawtemperature - 4000;
x1 = (bmp085_regb2* (b6 * b6) >> 12) >> 11;
x2 = (bmp085_regac2 * b6) >> 11;
x3 = x1 + x2;
b3 = (((((long)bmp085_regac1) * 4 + x3) << BMP085_MODE) + 2) >> 2;
x1 = (bmp085_regac3 * b6) >> 13;
x2 = (bmp085_regb1 * ((b6 * b6) >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (bmp085_regac4 * (uint32_t)(x3 + 32768)) >> 15;
b7 = ((uint32_t)up - b3) * (50000 >> BMP085_MODE);
p = b7 < 0x80000000 ? (b7 << 1) / b4 : (b7 / b4) << 1;
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
bmp085_rawpressure = p + ((x1 + x2 + 3791) >> 4);

#if BMP085_FILTERPRESSURE == 1
bmp085_rawpressure = bmp085_avaragefilter(bmp085_rawpressure);
#endif
}[/syntax]

Statystyki: Napisane przez wchpikus — 22 gru 2015, o 08:34

BMP180 - wysokość n.p.m. - proszę o sprawdzenie funkcji

2015-12-22T07:18:32+01:00

Witam!

Proszę o sprawdzenie poprawności zapisu funkcji do wyliczania wysokości n.p.m. na podstawie ciśnienia atmosferycznego. Nie działa Rzutowanie na float - błąd kompilacji. Rzutowanie na uint16_t - zwraca wynik -21206. Funkcja BMP180_getp() zwraca wartość typu long. Podstawiane wartości: Po-101325Pa (poziom morza), P-99247Pa (u mnie). Spodziewany wynik 250m n.p.m. Wzór na wysokość z noty katalogowej czujnika BMP180.

[syntax=c]long getAltitude(void){
static long SLP = 101325; // Pa
long altitude;
altitude = (float)44330 * (1-pow((float)BMP180_getp()/SLP, (1/5.255)));
return (long)altitude;
}[/syntax]

Pozdrawiam

Statystyki: Napisane przez avrfun — 22 gru 2015, o 07:18