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package com.diozero.devices;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: BMP180.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import java.io.Closeable;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import com.diozero.api.I2CConstants;
import com.diozero.api.I2CDevice;
import com.diozero.api.RuntimeIOException;
import com.diozero.util.SleepUtil;
/**
* Bosch BMP180 I2C temperature and pressure sensor
*/
@SuppressWarnings("unused")
public class BMP180 implements ThermometerInterface, BarometerInterface, Closeable {
/**
* Device address BMP180 address is 0x77
*/
private static final int BMP180_ADDR = 0x77;
/**
* Total number of bytes used for calibration
*/
private static final int CALIBRATION_BYTES = 22;
// BMP085 EEPROM Registers
private static final int EEPROM_START = 0xAA;
private static final int BMP085_CAL_AC1 = 0xAA;
private static final int BMP085_CAL_AC2 = 0xAC;
private static final int BMP085_CAL_AC3 = 0xAE;
private static final int BMP085_CAL_AC4 = 0xB0;
private static final int BMP085_CAL_AC5 = 0xB2;
private static final int BMP085_CAL_AC6 = 0xB4;
private static final int BMP085_CAL_B1 = 0xB6;
private static final int BMP085_CAL_B2 = 0xB8;
private static final int BMP085_CAL_MB = 0xBA;
private static final int BMP085_CAL_MC = 0xBC;
private static final int BMP085_CAL_MD = 0xBE;
private static final int BMP085_CONTROL = 0xF4;
private static final int CONTROL_REGISTER = 0xF4; // BMP180 control register
private static final int BMP085_TEMPDATA = 0xF6;
private static final int TEMP_ADDR = 0xF6; // Temperature read address
private static final int BMP085_PRESSUREDATA = 0xF6;
private static final int PRESS_ADDR = 0xF6; // Pressure read address
// Commands
private static final byte GET_TEMP_CMD = (byte) 0x2E; // Read temperature command
private static final byte GET_PRESSURE_COMMAND = (byte) 0x34; // Read pressure command
/**
* EEPROM registers - these represent calibration data
*/
private short calAC1;
private short calAC2;
private short calAC3;
private int calAC4;
private int calAC5;
private int calAC6;
private short calB1;
private short calB2;
private short calMB;
private short calMC;
private short calMD;
// Barometer configuration
private BMPMode mode;
private I2CDevice i2cDevice;
/**
* Constructor
*
* @param mode BMP180 operating mode (low power .. ultra-high resolution)
* @throws RuntimeIOException if an I/O error occurs
**/
public BMP180(BMPMode mode) throws RuntimeIOException {
this(I2CConstants.CONTROLLER_1, mode);
}
public BMP180(int controller, BMPMode mode) throws RuntimeIOException {
i2cDevice = I2CDevice.builder(BMP180_ADDR).setController(controller).setByteOrder(ByteOrder.BIG_ENDIAN).build();
this.mode = mode;
}
/**
* This method reads the calibration data common for the Temperature sensor and
* Barometer sensor included in the BMP180
*
* @throws RuntimeIOException if an I/O error occurs
**/
public void readCalibrationData() throws RuntimeIOException {
// Read all of the calibration data into a byte array
ByteBuffer calibData = i2cDevice.readI2CBlockDataByteBuffer(EEPROM_START, CALIBRATION_BYTES);
// Read each of the pairs of data as a signed short
calibData.rewind();
calAC1 = calibData.getShort();
calAC2 = calibData.getShort();
calAC3 = calibData.getShort();
// Unsigned short values
calAC4 = calibData.getShort() & 0xffff;
calAC5 = calibData.getShort() & 0xffff;
calAC6 = calibData.getShort() & 0xffff;
// Signed sort values
calB1 = calibData.getShort();
calB2 = calibData.getShort();
calMB = calibData.getShort();
calMC = calibData.getShort();
calMD = calibData.getShort();
}
private int readRawTemperature() throws RuntimeIOException {
// Write the read temperature command to the command register
i2cDevice.writeByteData(CONTROL_REGISTER, GET_TEMP_CMD);
// Wait 5m before reading the temperature
SleepUtil.sleepMillis(5);
// Read uncompressed data
return i2cDevice.readUShort(TEMP_ADDR);
}
/**
* Method for reading the temperature. Remember the sensor will provide us with
* raw data, and we need to transform in some analysed value to make sense. All
* the calculations are normally provided by the manufacturer. In our case we
* use the calibration data collected at construction time.
*
* @return Temperature in Celsius as a double
* @throws RuntimeIOException If there is an IO error reading the sensor
*/
@Override
public float getTemperature() throws RuntimeIOException {
int UT = readRawTemperature();
// Calculate the actual temperature
int X1 = ((UT - calAC6) * calAC5) >> 15;
int X2 = (calMC << 11) / (X1 + calMD);
int B5 = X1 + X2;
return ((B5 + 8) >> 4) / 10.0f;
}
private int readRawPressure() throws RuntimeIOException {
// Write the read pressure command to the command register
i2cDevice.writeByteData(CONTROL_REGISTER, mode.getPressureCommand());
// Delay before reading the pressure - use the value determined by the
// sampling mode
SleepUtil.sleepMillis(mode.getDelay());
// Read the non-compensated pressure value
long val = i2cDevice.readUInt(PRESS_ADDR, 3);
// ((msb << 16) + (lsb << 8) + xlsb) >> (8 - self._mode)
return (int) (val >> (8 - mode.getSamplingMode()));
}
/**
* Read the barometric pressure (in hPa) from the device.
*
* @return Pressure measurement in hPa
*/
@Override
public float getPressure() throws RuntimeIOException {
int sampling_mode = mode.getSamplingMode();
int UT = readRawTemperature();
int UP = readRawPressure();
// Calculate true temperature coefficient B5.
int X1 = ((UT - calAC6) * calAC5) >> 15;
int X2 = (calMC << 11) / (X1 + calMD);
int B5 = X1 + X2;
// Calculate the true pressure
int B6 = B5 - 4000;
X1 = (calB2 * (B6 * B6) >> 12) >> 11;
X2 = calAC2 * B6 >> 11;
int X3 = X1 + X2;
int B3 = ((((calAC1 * 4) + X3) << sampling_mode) + 2) / 4;
X1 = calAC3 * B6 >> 13;
X2 = (calB1 * ((B6 * B6) >> 12)) >> 16;
X3 = ((X1 + X2) + 2) >> 2;
int B4 = (calAC4 * (X3 + 32768)) >> 15;
int B7 = (UP - B3) * (50000 >> sampling_mode);
int pa;
// FIXME Vacuous comparison of integer value - 0x80000000 is Math.MIN_VALUE!
if (B7 < 0x80000000) {
pa = (B7 * 2) / B4;
} else {
pa = (B7 / B4) * 2;
}
X1 = (pa >> 8) * (pa >> 8);
X1 = (X1 * 3038) >> 16;
X2 = (-7357 * pa) >> 16;
pa += ((X1 + X2 + 3791) >> 4);
return pa / 100f;
}
/**
* Relationship between sampling mode and conversion delay (in ms) for each
* sampling mode Ultra low power: 4.5 ms minimum conversion delay Standard: 7.5
* ms High Resolution: 13.5 ms Ultra high Resolution: 25.5 ms
*/
public static enum BMPMode {
ULTRA_LOW_POWER(0, 5), STANDARD(1, 8), HIGH_RESOLUTION(2, 14), ULTRA_HIGH_RESOLUTION(3, 26);
/**
* Sampling mode
*/
private final int samplingMode;
/**
* Minimum delay required when reading pressure
*/
private final int delay;
/**
* Command byte to read pressure based on sampling mode
*/
private final byte pressureCommand;
/**
* Create a new instance of a BMPMode
*
* @param samplingMode
* @param delay
*/
BMPMode(int samplingMode, int delay) {
this.samplingMode = samplingMode;
this.delay = delay;
this.pressureCommand = (byte) (GET_PRESSURE_COMMAND + ((samplingMode << 6) & 0xC0));
}
/**
* Return the conversion delay (in ms) associated with this sampling mode
*
* @return delay
*/
public int getDelay() {
return delay;
}
/**
* Return the pressure command to the control register for this sampling mode
*
* @return command
*/
public byte getPressureCommand() {
return pressureCommand;
}
/**
* Return this sampling mode
*
* @return Sampling mode
*/
public int getSamplingMode() {
return samplingMode;
}
}
@Override
public void close() {
i2cDevice.close();
}
}
