Problem getting stable data from I2C sensor when receiving by SoftEasyTransfer

[Anonymous]

Hello!

 

I’m trying to obtain pressure samples from a MS5611 altimeter ([url=http://www.drotek.fr/shop/en/home/62-imu-10dof-mpu6050-hmc5883-ms5611.html]Drotek 10 DOF[/url]), and after some issues with the conversion of RawData I finally got it.

 

The next step is send this data and some other to another micro (I’m using two ATMEGA328 for this) for later processing, to achieve this I’ve tried using the library [url=http://www.billporter.info/2011/05/30/easytransfer-arduino-library/]SoftEasyTransfer[/url]. There seems to be no problem when I use

[code]ET.sendData()[/code]

, but the data starts to drift when adding

[code]ET.receiveData()[/code]

to my program.

 

I’m using pins 27 and 28 (SCL and SDA) on one of the ATMEGAs to get info from the sensor, and pins 4 and 5 on both ATMEGAs to communicate between them.

 

I don’t know why this can be. Maybe they share the same buffer? I’m completely lost.

This is my program for one of the ATMEGA328, the one I call microB (there are some variables and led functions that I haven’t added for simplifying purposes, I’ve checked they don’t interfere):

 

[code]/*librerías necesarias para sensor MS561101*/

#include <Wire.h>

 

/*librerías necesarias para intercomunicación con micro A (SOFTSERIAL)*/

#include <SoftEasyTransfer.h>

#include <SoftwareSerial.h>

 

SoftwareSerial softSerial(2, 3);

 

/*variables para calcular press y temp*/

#define ADDRESS 0x77 // 0x76

#define SAMPLENUM 10

 

uint32_t D1 = 0;

uint32_t D2 = 0;

int64_t dT = 0;

int32_t TEMP = 0;

int64_t OFF = 0;

int64_t SENS = 0;

int32_t P = 0;

uint16_t C[7];

 

float temperature;

float pressure;

 

float sampledPress[SAMPLENUM];

unsigned long contadorPress = 0;

int indice = 0;

float pressRef;

int estado = 0; // 0: parado; 2: subiendo; 1: bajando

boolean moveOK = false;

int limite = 3;

int indiceFor = 0;

float cteFiltro1 = 0.85;

 

/*Softserial !!!*/

SoftEasyTransfer ET;

 

struct SERIAL_DATA_STRUCTURE

{

// microB ---->microA

// there are 7 variables here

 

 

//microA---> microB

//there are 14 variables here

};

 

//give a name to the group of data

SERIAL_DATA_STRUCTURE soft_serial_data;

 

void setup()

{

/** SETUP PARA MS561101 **/

// Disable internal pullups, 10Kohms are on the breakout

PORTC |= (1 << 4);

PORTC |= (1 << 5);

 

Wire.begin();

delay(100);

initial(ADDRESS);

 

/** SETUP PARA SOFTSERIAL **/

softSerial.begin(57600);

//start the library, pass in the data details and the name of the serial port.

ET.begin(details(soft_serial_data), &softSerial);

 

 

delay(500);

}

 

void loop()

{

assignPress();

 

assignDataToSend();

ET.sendData();

 

if(ET.receiveData()){

//assignReceivedData();

//delay(1000);

}

 

}

 

/** FUNCIONES PARA MS561101 **/

//filtramos el valor obtenido de presión y lo metemos a un registro FIFO

void assignPress()

{

pressure = pressure*cteFiltro1 + getPress()*(1-cteFiltro1);

indice = contadorPress%SAMPLENUM;

sampledPress[indice] = pressure;

contadorPress++;

}

 

//cálculos necesarios para obtener una muestra de presión en mbar

float getPress()

{

D1 = getVal(ADDRESS, 0x48); // Pressure raw

D2 = getVal(ADDRESS, 0x58);// Temperature raw

 

dT   = D2 - ((uint64_t)C[5] << 8);

OFF  = ((int64_t)C[2] << 16) + ((dT * C[4]) >> 7);

SENS = ((int32_t)C[1] << 15) + ((dT * C[3]) >> 8);

 

TEMP = (int64_t)dT * (int64_t)C[6] / 8388608 + 2000;

 

if(TEMP < 2000) // if temperature lower than 20 Celsius

{

int32_t T1    = 0;

int64_t OFF1  = 0;

int64_t SENS1 = 0;

 

T1    = pow(dT, 2) / 2147483648;

OFF1  = 5 * pow((TEMP - 2000), 2) / 2;

SENS1 = 5 * pow((TEMP - 2000), 2) / 4;

 

if(TEMP < -1500) // if temperature lower than -15 Celsius

{

OFF1  = OFF1 + 7 * pow((TEMP + 1500), 2);

SENS1 = SENS1 + 11 * pow((TEMP + 1500), 2) / 2;

}

 

TEMP -= T1;

OFF -= OFF1;

SENS -= SENS1;

}

 

temperature = (float)TEMP / 100;

 

P  = ((int64_t)D1 * SENS / 2097152 - OFF) / 32768;

 

pressure = (float)P / 100;

 

return pressure;

}

 

//obtener valores de la prom del IMU

long getVal(int address, byte code)

{

unsigned long ret = 0;

Wire.beginTransmission(address);

Wire.write(code);

Wire.endTransmission();

delay(10);

// start read sequence

Wire.beginTransmission(address);

Wire.write((byte) 0x00);

Wire.endTransmission();

Wire.beginTransmission(address);

Wire.requestFrom(address, (int)3);

if (Wire.available() >= 3)

{

ret = Wire.read() * (unsigned long)65536 + Wire.read() * (unsigned long)256 + Wire.read();

}

else {

ret = -1;

}

Wire.endTransmission();

return ret;

}

 

//cálculo de coeficientes necesarios para las posteriores fórmulas matemáticas mediante las que se consigue muestrear la presión ambiental

void initial(uint8_t address)

{

Wire.beginTransmission(address);

Wire.write(0x1E); // reset

Wire.endTransmission();

delay(10);

 

for (int i=0; i<6  ; i++) {

 

Wire.beginTransmission(address);

Wire.write(0xA2 + (i * 2));

Wire.endTransmission();

 

Wire.beginTransmission(address);

Wire.requestFrom(address, (uint8_t) 6);

delay(1);

if(Wire.available())

{

C[i+1] = Wire.read() << 8 | Wire.read();

}

else {

//Serial.println("Error reading PROM 1"); // error reading the PROM or communicating with the device

}

}

}[/code]

 

As you can see I haven’t added the functions assignReceivedData() and assignDataToSend(), but this is because I’m actually not using them until I solve the press data problem.

 

Without adding this:

[code]if(ET.receiveData()){

//assignReceivedData();

//delay(1000);

}[/code]

to the above program I get very stable samples of press, but if I add those lines, the samples go fast down occasionally and then returns to the stable value which I can’t stand.

 

Could anyone, please, suggest me a solution?

[Bill]

I would first suggesting using 2 different structures; 1 for transmitting A to B and one for receiving B to A. It looks like you tried using 1 structure with 2 sets of values, which would cause issues of local data being overwritten by garbage data from the other Arduino.

[Anonymous]

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