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BMP180Module.cpp
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BMP180Module.cpp
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/*
* BMP180Module.cpp
*
* Created on: Feb 20, 2014
* Author: Saminda
*/
#include "BMP180Module.h"
#if defined(ENERGIA)
#include "Wire.h"
#endif
MAKE_MODULE(BMP180Module)
void BMP180Module::init()
{
calibration();
}
void BMP180Module::update(BMP180Representation& theBMP180Representation)
{
#if defined(ENERGIA)
calculation(theBMP180Representation); // run calculations for temperature and pressure
//Serial.print("Temperature: ");
//Serial.println(theBMP180Representation.fTemperature, 3);
//Serial.print("Pressure: ");
//Serial.println(theBMP180Representation.fPressure, 3);
//Serial.print("Altitude: ");
//Serial.println(theBMP180Representation.fAltitude, 3);
#endif
}
void BMP180Module::calibration()
{
#if defined(ENERGIA)
I2CMRead(BMP180_O_AC1_MSB);
parameters.i16AC1 = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_AC2_MSB);
parameters.i16AC2 = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_AC3_MSB);
parameters.i16AC3 = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_AC4_MSB);
parameters.ui16AC4 = (uint16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_AC5_MSB);
parameters.ui16AC5 = (uint16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_AC6_MSB);
parameters.ui16AC6 = (uint16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_B1_MSB);
parameters.i16B1 = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_B2_MSB);
parameters.i16B2 = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_MC_MSB);
parameters.i16MC = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
I2CMRead(BMP180_O_MD_MSB);
parameters.i16MD = (int16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
//Serial.print("i16AC1=");
//Serial.println(parameters.i16AC1);
//Serial.print("i16AC2=");
//Serial.println(parameters.i16AC2);
//Serial.print("i16AC3=");
//Serial.println(parameters.i16AC3);
//Serial.print("ui16AC4=");
//Serial.println(parameters.ui16AC4);
//Serial.print("ui16AC5=");
//Serial.println(parameters.ui16AC5);
//Serial.print("ui16AC6=");
//Serial.println(parameters.ui16AC6);
//Serial.print("i16B1=");
//Serial.println(parameters.i16B1);
//Serial.print("i16B2=");
//Serial.println(parameters.i16B2);
//Serial.print("i16MC=");
//Serial.println(parameters.i16MC);
//Serial.print("i16MD=");
//Serial.println(parameters.i16MD);
#endif
}
// read 16-bits from I2C
void BMP180Module::I2CMRead(const uint8_t& addr, const uint8_t& bytes)
{
#if defined(ENERGIA)
Wire.beginTransmission(parameters.ui8Addr);
Wire.write(addr);
Wire.endTransmission(false);
Wire.requestFrom(parameters.ui8Addr, bytes);
while (Wire.available() < bytes - 1)
;
parameters.pui8Data[0] = Wire.read();
parameters.pui8Data[1] = Wire.read();
if (bytes == 3)
parameters.pui8Data[2] = Wire.read();
#endif
}
void BMP180Module::cmdI2CMRead(const uint8_t& cmd, const uint8_t& addr, const uint8_t& bytes)
{
#if defined(ENERGIA)
Wire.beginTransmission(parameters.ui8Addr);
Wire.write(BMP180_O_CTRL_MEAS);
Wire.write(cmd);
Wire.endTransmission();
delay(5); //<< To ready data (Read manufacturer data sheet: TODO)
I2CMRead(addr, bytes);
#endif
}
void BMP180Module::calculation(BMP180Representation& theBMP180Representation)
{
#if defined(ENERGIA)
// Temperature
cmdI2CMRead((BMP180_CTRL_MEAS_SCO | BMP180_CTRL_MEAS_TEMPERATURE), BMP180_O_OUT_MSB, 2);
float fUT, fX1, fX2, fB5;
//
// Get the uncompensated temperature.
//
fUT = (float) (uint16_t) ((parameters.pui8Data[0] << 8) | parameters.pui8Data[1]);
//
// Calculate the true temperature.
//
fX1 = ((fUT - (float) parameters.ui16AC6) * (float) parameters.ui16AC5) / 32768.f;
fX2 = ((float) parameters.i16MC * 2048.f) / (fX1 + (float) parameters.i16MD);
fB5 = fX1 + fX2;
theBMP180Representation.fTemperature = fB5 / 160.f;
// This is with no sampling
cmdI2CMRead((BMP180_CTRL_MEAS_SCO | BMP180_CTRL_MEAS_PRESSURE | parameters.ui8Mode),
BMP180_O_OUT_MSB, 3);
float fUP, fX3, fB3, fB4, fB6, fB7, fP;
int_fast8_t i8Oss;
uint32_t rawPressure = (int32_t) ((parameters.pui8Data[0] << 16) | (parameters.pui8Data[1] << 8)
| (parameters.pui8Data[2] & BMP180_OUT_XLSB_M));
// Get the oversampling ratio.
//
i8Oss = parameters.ui8Mode >> BMP180_CTRL_MEAS_OSS_S;
//
// Retrieve the uncompensated pressure.
//
fUP = ((float) (int32_t) ((parameters.pui8Data[0] << 16) | (parameters.pui8Data[1] << 8)
| (parameters.pui8Data[2] & BMP180_OUT_XLSB_M)) / (1 << (8 - i8Oss)));
//
// Calculate the true temperature.
//
fX1 = ((fUT - (float) parameters.ui16AC6) * (float) parameters.ui16AC5) / 32768.f;
fX2 = ((float) parameters.i16MC * 2048.f) / (fX1 + (float) parameters.i16MD);
fB5 = fX1 + fX2;
//
// Calculate the true pressure.
//
fB6 = fB5 - 4000;
fX1 = ((float) parameters.i16B2 * ((fB6 * fB6) / 4096)) / 2048;
fX2 = ((float) parameters.i16AC2 * fB6) / 2048;
fX3 = fX1 + fX2;
fB3 = ((((float) parameters.i16AC1 * 4) + fX3) * (1 << i8Oss)) / 4;
fX1 = ((float) parameters.i16AC3 * fB6) / 8192;
fX2 = ((float) parameters.i16B1 * ((fB6 * fB6) / 4096)) / 65536;
fX3 = (fX1 + fX2) / 4;
fB4 = (float) parameters.ui16AC4 * ((fX3 / 32768) + 1);
fB7 = (fUP - fB3) * (50000 >> i8Oss);
fP = (fB7 * 2) / fB4;
fX1 = (fP / 256) * (fP / 256);
fX1 = (fX1 * 3038) / 65536;
fX2 = (fP * -7357) / 65536;
fP += (fX1 + fX2 + 3791) / 16;
theBMP180Representation.fPressure = fP;
//
// Calculate the altitude.
//
theBMP180Representation.fAltitude = 44330.0f
* (1.0f - powf(theBMP180Representation.fPressure / 101325.0f, 1.0f / 5.255f));
#endif
}