ATNEL tech-forum 2017-03-13T21:28:55+01:00 https://forum.atnel.pl/feed.php?f=8&t=17717&mode 2017-03-13T21:28:55+01:00 2017-03-13T21:28:55+01:00 https://forum.atnel.pl/viewtopic.php?t=17717&p=184788#p184788 <![CDATA[Re: MPL3115A2 błędny pomiar cziśnienia]]> janusz17 jak często mogę odczytywać nowe dane z czujnika? Jakoś nie mogę ogarnąć pdf-a. Chciałbym odczytywać minimum 4 pomiary wysokości na sekundę, ale jak ustawię w trybie oczekiwania na nowy pomiar
Code:
IIC_RegWrite( 0xC0,0x26,0xB9)

to flaga PTOW w Sensor Status Register "przychodzi" mi co 1 sekundę czyli odczyt wysokości mam co sekundę.
Mógłbyś podpowiedzieć mi jak skonfigurować rejestry do częstszego odczytu danych? Chciałem zrobić np. odczyt "ręczny" z timera programowego.

Statystyki: Napisane przez Tom277 — 13 mar 2017, o 21:28

]]> 2017-02-24T13:43:33+01:00 2017-02-24T13:43:33+01:00 https://forum.atnel.pl/viewtopic.php?t=17717&p=183471#p183471 <![CDATA[Re: MPL3115A2 błędny pomiar cziśnienia]]> Ja stosowałem kiedyś następujące kody do odczytu tych czujników i nie miałem nigdy większej różnicy wskazań w stosunku do stacji meteorologicznej jak
2 hPa. Oczywiście mam na myśli ciśnienie bezwzględne.

[syntax=c]#include <avr/io.h>
#include <avr/pgmspace.h>


#include "mpl3115a2.h"
#include "../I2C_TWI/i2c_twi.h"

const uint8_t tabela_ulamkow[] PROGMEM = {0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9};

uint32_t H;
uint8_t ulamek_H;
uint8_t znak_H;

uint32_t P;
uint8_t ulamek_P;

uint32_t delta_P;
uint8_t ulamek_delta_P;
uint8_t znak_delta_P;


/* Put MPL3115A2 into Active Mode*/

void MPL3115A2_Active (void)
{
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG1, (TWI_read_register(MPL3115A2_ADDRESS, CTRL_REG1) | ACTIVE_MASK));
}



/* Put MPL3115A2 into Standby Mode*/

uint8_t MPL3115A2_Standby (void)
{
uint8_t n;
/*
** Read current value of System Control 1 Register.
** Put sensor into Standby Mode.
** Return with previous value of System Control 1 Register.
*/
n = TWI_read_register(MPL3115A2_ADDRESS, CTRL_REG1);
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG1, n & STANDBY_SBYB_0);

return(n);
}



/* Initialize MPL3115A2*/

void MPL3115A2_Init_Alt (void)
{

/*
** Configure sensor for:
** - 128 Oversampling
** - Altitude Mode
** - Set Interrupts to Active Low/Open Drain
** - Set Data Event Flags for Pressure/Altitude and Temperature
** - Set Generate Data Event Flag
*/
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG1, (ALT_MASK | OS2_MASK | OS1_MASK | OS0_MASK));
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG2, CLEAR_CTRLREG2);
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG3, (PP_OD1_MASK | PP_OD2_MASK));
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG4, INT_EN_CLEAR);
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG5, INT_CFG_CLEAR);
TWI_write_register(MPL3115A2_ADDRESS, PT_DATA_CFG_REG, (DREM_MASK | PDEFE_MASK | TDEFE_MASK));

}


/* Initialize MPL3115A2*/

void MPL3115A2_Init_Bar (void)
{

/*
** Configure sensor for:
** - 128 Oversampling
** - Barometer Mode
** - Set Interrupts to Active Low/Open Drain
** - Set Data Event Flags for Pressure/Altitude and Temperature
** - Set Generate Data Event Flag
*/
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG1, (OS2_MASK | OS1_MASK | OS0_MASK));
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG2, CLEAR_CTRLREG2);
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG3, (PP_OD1_MASK | PP_OD2_MASK));
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG4, INT_EN_CLEAR);
TWI_write_register(MPL3115A2_ADDRESS, CTRL_REG5, INT_CFG_CLEAR);
TWI_write_register(MPL3115A2_ADDRESS, PT_DATA_CFG_REG, (DREM_MASK | PDEFE_MASK | TDEFE_MASK));

}

/* Obliczenie wysokości */
void MPL3115A2_oblicz_H (void)
{
uint8_t bufor[3];
TWI_read_buf(MPL3115A2_ADDRESS, OUT_P_MSB_REG, 3, bufor);
H |= bufor[0];
H <<= 8;
H |= bufor[1];
if(bufor[0] >= 0x80)
{
H = (~H) + 1;
znak_H = 1;
}
else
znak_H = 0;
ulamek_H = pgm_read_byte(tabela_ulamkow[(bufor[2] >> 4)]);
}

/* Obliczenie ciśnienia */
void MPL3115A2_oblicz_P (void)
{
uint8_t bufor[3];
TWI_read_buf(MPL3115A2_ADDRESS, OUT_P_MSB_REG, 3, bufor);
P = 0;
P |= bufor[0];
P <<= 8;
P |= bufor[1];
P <<= 2;
P |= bufor[2] >> 6;
ulamek_P = (uint8_t)(P % 100);
ulamek_P /= 10;
P /= 100;
}

/* Obliczenie zmiany ciśnienia */
void MPL3115A2_oblicz_delta_P (void)
{
uint8_t bufor[3];
TWI_read_buf(MPL3115A2_ADDRESS, OUT_P_DELTA_MSB_REG, 3, bufor);
delta_P = 0;
delta_P |= bufor[0];
delta_P <<= 8;
delta_P |= bufor[1];
delta_P <<= 2;
delta_P |= bufor[2] >> 6;
if(bufor[0] > 0x7F)
{
znak_delta_P = 1;
delta_P |= 0xFFFC0000;
delta_P = (~delta_P) + 1;
}
else
{
znak_delta_P = 0;
}
ulamek_delta_P = (uint8_t)(P % 100);
ulamek_delta_P /= 10;
delta_P /= 100;
}[/syntax]
[syntax=c]#ifndef MPL3115A2_H_
#define MPL3115A2_H_

#define MPL3115A2_ADDRESS0xC0



/*
**
** MPL3115A2 Sensor Internal Registers
*/
enum
{
MPL3115A2_STATUS_00 = 0, // 0x00
MPL3115A2_OUT_P_MSB, // 0x01
MPL3115A2_OUT_P_CSB, // 0x02
MPL3115A2_OUT_P_LSB, // 0x03
MPL3115A2_OUT_T_MSB, // 0x04
MPL3115A2_OUT_T_LSB, // 0x05
MPL3115A2_OUT_DR_STATUS, // 0x06
MPL3115A2_OUT_P_DELTA_MSB, // 0x07
MPL3115A2_OUT_P_DELTA_CSB, // 0x08
MPL3115A2_OUT_P_DELTA_LSB, // 0x09
MPL3115A2_OUT_T_DELTA_MSB, // 0x0A
MPL3115A2_OUT_T_DELTA_LSB, // 0x0B
MPL3115A2_WHO_AM_I, // 0x0C
MPL3115A2_F_STATUS, // 0x0D
MPL3115A2_F_DATA, // 0x0E
MPL3115A2_F_SETUP, // 0x0F
MPL3115A2_TIME_DLY, // 0x10
MPL3115A2_SYSMOD, // 0x11
MPL3115A2_INT_SOURCE, // 0x12
MPL3115A2_PT_DATA_CFG, // 0x13
MPL3115A2_BAR_IN_MSB, // 0x14
MPL3115A2_BAR_IN_LSB, // 0x15
MPL3115A2_P_ARM_MSB, // 0x16
MPL3115A2_P_ARM_LSB, // 0x17
MPL3115A2_T_ARM, // 0x18
MPL3115A2_P_ARM_WND_MSB, // 0x19
MPL3115A2_P_ARM_WND_LSB, // 0x1A
MPL3115A2_T_ARM_WND, // 0x1B
MPL3115A2_P_MIN_MSB, // 0x1C
MPL3115A2_P_MIN_CSB, // 0x1D
MPL3115A2_P_MIN_LSB, // 0x1E
MPL3115A2_T_MIN_MSB, // 0x1F
MPL3115A2_T_MIN_LSB, // 0x20
MPL3115A2_P_MAX_MSB, // 0x21
MPL3115A2_P_MAX_CSB, // 0x22
MPL3115A2_P_MAX_LSB, // 0x23
MPL3115A2_T_MAX_MSB, // 0x24
MPL3115A2_T_MAX_LSB, // 0x25
MPL3115A2_CTRL_REG1, // 0x26
MPL3115A2_CTRL_REG2, // 0x27
MPL3115A2_CTRL_REG3, // 0x28
MPL3115A2_CTRL_REG4, // 0x29
MPL3115A2_CTRL_REG5, // 0x2A
MPL3115A2_OFF_P, // 0x2B
MPL3115A2_OFF_T, // 0x2C
MPL3115A2_OFF_H // 0x2D
};

/*
** STATUS Registers
*/
#define STATUS_00_REG 0x00
#define DR_STATUS_00_REG 0x06
//
#define PTOW_BIT Bit._7
#define POW_BIT Bit._6
#define TOR_BIT Bit._5

#define PTDR_BIT Bit._3
#define PDR_BIT Bit._2
#define TDR_BIT Bit._1

#define PDR_MASK 0x04
#define TDR_MASK 0x02
//
#define ZYXOW_MASK 0x80
#define ZOW_MASK 0x40
#define YOR_MASK 0x20
#define XOR_MASK 0x10
#define ZYXDR_MASK 0x08
#define ZDR_MASK 0x04
#define YDR_MASK 0x02
#define XDR_MASK 0x01

/*
** 8-Bit OUT Data Registers
*/
#define OUT_P_MSB_REG 0x01
#define OUT_P_CSB_REG 0x02
#define OUT_P_LSB_REG 0x03
#define OUT_T_MSB_REG 0x04
#define OUT_T_LSB_REG 0x05

#define OUT_P_DELTA_MSB_REG 0x07
#define OUT_P_DELTA_CSB_REG 0x08
#define OUT_P_DELTA_LSB_REG 0x09
#define OUT_T_DELTA_MSB_REG 0x0A
#define OUT_T_DELTA_LSB_REG 0x0B
#define WHO_AM_I_REG 0x0C

/*
** F_STATUS FIFO Status Register
*/
#define F_STATUS_REG 0x0D
//
#define F_OVF_BIT Bit._7
#define F_WMRK_FLAG_BIT Bit._6
#define F_CNT5_BIT Bit._5
#define F_CNT4_BIT Bit._4
#define F_CNT3_BIT Bit._3
#define F_CNT2_BIT Bit._2
#define F_CNT1_BIT Bit._1
#define F_CNT0_BIT Bit._0
//
#define F_OVF_MASK 0x80
#define F_WMRK_FLAG_MASK 0x40
#define F_CNT5_MASK 0x20
#define F_CNT4_MASK 0x10
#define F_CNT3_MASK 0x08
#define F_CNT2_MASK 0x04
#define F_CNT1_MASK 0x02
#define F_CNT0_MASK 0x01
#define F_CNT_MASK 0x3F

/*
** F_8DATA 8-Bit FIFO Data Register
*/
#define F_DATA_REG 0x0E


/*
** F_SETUP FIFO Setup Register
*/
#define F_SETUP_REG 0x0F
//
#define F_MODE1_BIT Bit._7
#define F_MODE0_BIT Bit._6
#define F_WMRK5_BIT Bit._5
#define F_WMRK4_BIT Bit._4
#define F_WMRK3_BIT Bit._3
#define F_WMRK2_BIT Bit._2
#define F_WMRK1_BIT Bit._1
#define F_WMRK0_BIT Bit._0
//
#define F_MODE01_MASK 0x40
#define F_MODE10_MASK 0x80
#define F_WMRK5_MASK 0x20
#define F_WMRK4_MASK 0x10
#define F_WMRK3_MASK 0x08
#define F_WMRK2_MASK 0x04
#define F_WMRK1_MASK 0x02
#define F_WMRK0_MASK 0x01
#define F_MODE_MASK 0xC0
#define F_WMRK_MASK 0x3F
#define F_CLEAR_MASK 0x00

#define TIME_DELAY 0x10

/*
** SYSMOD System Mode Register
*/
#define SYSMOD_REG 0x11
//

#define FGERR_BIT Bit._6

#define SYSMOD0_BIT Bit._0
//

#define SYSMOD_MASK 0x03

/*
** INT_SOURCE System Interrupt Status Register
*/
#define INT_SOURCE_REG 0x12
//
#define SRC_DRDY_BIT Bit._7
#define SRC_FIFO_BIT Bit._6
#define SRC_PW Bit._5
#define SRC_TW Bit._4
#define SRC_PTH Bit._3
#define SRC_TTH Bit._2
#define SRC_PCHG Bit._1
#define SRC_TCHG Bit._0
//
#define SRC_DRDY_MASK 0x80
#define SRC_FIFO_MASK 0x40
#define SRC_P_MASK 0x20
#define SRC_T_MASK 0x10
#define SRC_PW_MASK 0x08
#define SRC_TW_MASK 0x04
#define SRC_PCHG_MASK 0x02
#define SRC_TCHG_MASK 0x01

/*
** PT_DATA_CFG Sensor Data Configuration Register
*/
#define PT_DATA_CFG_REG 0x13
//
#define DREM_BIT 2
#define PDEFE_BIT 1
#define TDEFE_BIT 0
//
#define DREM_MASK 0x04
#define PDEFE_MASK 0x02
#define TDEFE_MASK 0x01

/*
** BAR IN
*/
#define BAR_IN_MSB 0x14
#define BAR_IN_LSB 0x15


/*
** BAR IN
*/
#define BAR_IN_MSB 0x14
#define BAR_IN_LSB 0x15

/*
** Pressure/Altitude Alarm Registers
*/
#define P_TGT_MSB 0x16
#define P_TGT_LSB 0x17


/*
** Pressure/Altitude Alarm Window Registers
*/
#define P_TGT_WND_MSB 0x19
#define P_TGT_WND_LSB 0x1A

/*
** Temperature Alarm Register
*/
#define T_TGT 0x18

/*
** Temperature Alarm Window Register
*/
#define T_TGT_WND 0x1B


/*
** CTRL_REG1 Interrupt Control Register
*/
#define CTRL_REG1 0x26
//
#define ALT_BIT Bit._7
#define RAW_BIT Bit._6
#define OS2_BIT Bit._5
#define OS1_BIT Bit._4
#define OS0_BIT Bit._3
#define RST_BIT Bit._2
#define OST_BIT Bit._1
#define SBYB_BIT Bit._0
//
#define ALT_MASK 0x80
#define RAW_MASK 0x40
#define OS2_MASK 0x20
#define OS1_MASK 0x10
#define OS0_MASK 0x08
#define RST_MASK 0x04
#define OST_MASK 0x02
#define SBYB_MASK 0x01

#define STANDBY_SBYB_0 0xFE
#define ACTIVE_MASK 0x01
#define RESET_MASK 0x04
#define ACTIVE_SBYB_OST OST_MASK+SBYB_MASK
#define FULL_SCALE_STANDBY 0x00
#define CLEAR_OSR 0xC3
#define OSR_2 0x08
#define OSR_4 0x10
#define OSR_8 0x18
#define OSR_16 0x20
#define OSR_32 0x28
#define OSR_64 0x30
#define OSR_128 0x38

#define DR_MASK 0x38
#define MODE_MASK 0x80
#define CLEAR_MODE_MASK 0x7F

/*
** CTRL_REG2 Interrupt Control Register
*/
#define CTRL_REG2 0x27
//
#define FIFO_GATE_BIT Bit._4
#define ST3_BIT Bit._3
#define ST2_BIT Bit._2
#define ST1_BIT Bit._1
#define ST0_BIT Bit._0
//
#define FIFO_GATE_MASK 0x10
#define ST3_MASK 0x08
#define ST2_MASK 0x04
#define ST1_MASK 0x02
#define ST0_MASK 0x01
#define ST_MASK 0x0F
#define CLEAR_ST_MASK 0xF0
#define CLEAR_CTRLREG2 0x00

/*
** CTRL_REG3 Interrupt Control Register
*/
#define CTRL_REG3 0x28
//

#define IPOL1_BIT Bit._5
#define PP_OD1_BIT Bit._4
#define IPOL2_BIT Bit._1
#define PP_OD2_BIT Bit._0
//

#define IPOL1_MASK 0x20
#define PP_OD1_MASK 0x10
#define IPOL2_MASK 0x02
#define PP_OD2_MASK 0x01

/*
** CTRL_REG4 Interrupt Control Register
*/
#define CTRL_REG4 0x29
//
#define INT_EN_DRDY_BIT Bit._7
#define INT_EN_FIFO_BIT Bit._6
#define INT_EN_PW_BIT Bit._5
#define INT_EN_TW_BIT Bit._4
#define INT_EN_PTH_BIT Bit._3
#define INT_EN_TTH_BIT Bit._2
#define INT_EN_PCHG_BIT Bit._1
#define INT_EN_TCHG_BIT Bit._0
//
#define INT_EN_CLEAR 0x00
#define INT_EN_DRDY_MASK 0x80
#define INT_EN_FIFO_MASK 0x40
#define INT_EN_PW_MASK 0x20
#define INT_EN_TW_MASK 0x10
#define INT_EN_PTH_MASK 0x08
#define INT_EN_TTH_MASK 0x04
#define INT_EN_PCHG_MASK 0x02
#define INT_EN_TCHG_MASK 0x01

/*
** CTRL_REG5 Interrupt Control Register
*/
#define CTRL_REG5 0x2A
//
#define INT_CFG_CLEAR 0x00
#define INT_CFG_DRDY_MASK 0x80
#define INT_CFG_FIFO_MASK 0x40
#define INT_CFG_PW_MASK 0x20
#define INT_CFG_TW_MASK 0x10
#define INT_CFG_PTH_MASK 0x08
#define INT_CFG_TTH_MASK 0x04
#define INT_CFG_PCHG_MASK 0x02
#define INT_CFG_TCHG_MASK 0x01



void MPL3115A2_Init_Alt(void);
void MPL3115A2_Init_Bar(void);
uint8_t MPL3115A2_Standby(void);
void MPL3115A2_Active(void);
void MPL3115A2_oblicz_P (void);
void MPL3115A2_oblicz_H(void);
void MPL3115A2_oblicz_delta_P (void);

#endif /* MPL3115A2_H_ */[/syntax]

Statystyki: Napisane przez janusz17 — 24 lut 2017, o 13:43

]]> 2017-02-23T20:03:46+01:00 2017-02-23T20:03:46+01:00 https://forum.atnel.pl/viewtopic.php?t=17717&p=183400#p183400 <![CDATA[MPL3115A2 błędny pomiar cziśnienia]]> W sumie to nie wiem gdzie może leżeć problem, sprawdzałem moduł z gotowym kodem pod płytkę Arduino i wyniki mam bardzo podobne do mojego kodu w C. Programy pod Arduino sprawdzałem różne znalezione w internecie i wszędzie jest mniej więcej tak samo więc o co chodzi. Czujniki mam dwa i oba pokazują podobnie. Nie rozumiem tego, czy to znaczy, że wynik trzeba "dopasowywać" przez mnożenie przez jakąś stałą czy coś innego o czym nie wiem. Szukam po rejestrach czy nie powinienem gdzieś wpisać jakiegoś offsetu, ale jedyny jaki znalazłem to rejestr 0x2B i z tego co wyczytałem dotyczy korekcji wskazań wraz ze starzeniem się czujnika.
Wkleję link do datasheet-a. Za wszelkie uwagi z góry dziękuję.
a cha, temperaturę wskazuje raczej ok. komunikacja działa poprawnie więc nie tu szukałbym problemów.
Data Sheet MPL3115A2
https://www.google.pl/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&sqi=2&ved=0ahUKEwi75MyM5qbSAhULWRQKHZsWC7YQFgg5MAA&url=http%3A%2F%2Fwww.nxp.com%2Ffiles%2Fsensors%2Fdoc%2Fdata_sheet%2FMPL3115A2.pdf&usg=AFQjCNFD00ZnZNwELp6_MlOkfQRMDEhr-w&sig2=f_jZalAGOuY1I-9CaIgiHA&bvm=bv.147448319,d.bGs

Statystyki: Napisane przez Tom277 — 23 lut 2017, o 20:03

]]>