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com.diozero.devices.BME280 Maven / Gradle / Ivy
package com.diozero.devices;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: BME280.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 - 2020 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.nio.ByteBuffer;
import java.nio.ByteOrder;
import com.diozero.api.BarometerInterface;
import com.diozero.api.HygrometerInterface;
import com.diozero.api.I2CConstants;
import com.diozero.api.I2CDevice;
import com.diozero.api.ThermometerInterface;
import com.diozero.util.RuntimeIOException;
/**
* Datasheet
* Sample implementations:
* Java
* Adafruit / Python
* Adafruit_BME280.cpp
*/
public class BME280 implements BarometerInterface, ThermometerInterface, HygrometerInterface {
private static final int DEFAULT_ADDRESS = 0x76;
private static final int CALIB_00_REG = 0x88;
private static final int CALIB_26_REG = 0xe1;
private static final int CTRL_HUM_REG = 0xF2;
//private static final int STATUS_REG = 0xF3;
private static final int CTRL_MEAS_REG = 0xF4;
private static final int CONFIG_REG = 0xF5;
private static final int PRESS_MSB_REG = 0xF7;
// Flags for ctrl_hum and ctrl_meas registers
private static final byte OVERSAMPLING_1_MASK = 0b001;
private static final byte OVERSAMPLING_2_MASK = 0b010;
private static final byte OVERSAMPLING_4_MASK = 0b011;
private static final byte OVERSAMPLING_8_MASK = 0b100;
private static final byte OVERSAMPLING_16_MASK = 0b101;
public static enum HumidityOversampling {
OVERSAMPLING_1(OVERSAMPLING_1_MASK), OVERSAMPLING_2(OVERSAMPLING_2_MASK),
OVERSAMPLING_4(OVERSAMPLING_4_MASK), OVERSAMPLING_8(OVERSAMPLING_8_MASK), OVERSAMPLING_16(OVERSAMPLING_16_MASK);
private byte mask;
private HumidityOversampling(byte mask) {
this.mask = mask;
}
public byte getMask() {
return mask;
}
}
public static enum TemperatureOversampling {
OVERSAMPLING_1(OVERSAMPLING_1_MASK), OVERSAMPLING_2(OVERSAMPLING_2_MASK),
OVERSAMPLING_4(OVERSAMPLING_4_MASK), OVERSAMPLING_8(OVERSAMPLING_8_MASK), OVERSAMPLING_16(OVERSAMPLING_16_MASK);
private byte mask;
private TemperatureOversampling(byte mask) {
this.mask = (byte) (mask << 5);
}
public byte getMask() {
return mask;
}
}
public static enum PressureOversampling {
OVERSAMPLING_1(OVERSAMPLING_1_MASK), OVERSAMPLING_2(OVERSAMPLING_2_MASK),
OVERSAMPLING_4(OVERSAMPLING_4_MASK), OVERSAMPLING_8(OVERSAMPLING_8_MASK), OVERSAMPLING_16(OVERSAMPLING_16_MASK);
private byte mask;
private PressureOversampling(byte mask) {
this.mask = (byte) (mask << 2);
}
public byte getMask() {
return mask;
}
}
public static enum OperatingMode {
MODE_SLEEP(0b00), MODE_FORCED(0b01), MODE_NORMAL(0b11);
private byte mask;
private OperatingMode(int mask) {
this.mask = (byte) mask;
}
public byte getMask() {
return mask;
}
}
// Flags for config register
public static enum StandbyMode {
STANDBY_500_US(0b000), STANDBY_62_5_MS(0b001), STANDBY_125_MS(0b010), STANDBY_250_MS(0b011),
STANDBY_500_MS(0b100), STANDBY_1_S(0b101), STANDBY_10_MS(0b110), STANDBY_20_MS(0b111);
private byte mask;
private StandbyMode(int mask) {
this.mask = (byte) (mask << 5);
}
public byte getMask() {
return mask;
}
}
public static enum FilterMode {
FILTER_OFF(0b000), FILTER_2(0b001), FILTER_4(0b010), FILTER_8(0b011), FILTER_16(0b100);
private byte mask;
private FilterMode(int mask) {
this.mask = (byte) (mask << 2);
}
public byte getMask() {
return mask;
}
}
private I2CDevice device;
private int digT1;
private short digT2;
private short digT3;
private int digP1;
private short digP2;
private short digP3;
private short digP4;
private short digP5;
private short digP6;
private short digP7;
private short digP8;
private short digP9;
private short digH1;
private short digH2;
private int digH3;
private int digH4;
private int digH5;
private byte digH6;
public BME280() {
this(I2CConstants.BUS_1, DEFAULT_ADDRESS);
}
public BME280(int bus, int address) {
device = new I2CDevice(bus, address, I2CConstants.ADDR_SIZE_7,
I2CConstants.DEFAULT_CLOCK_FREQUENCY, ByteOrder.LITTLE_ENDIAN);
readCoefficients();
setOperatingModes(TemperatureOversampling.OVERSAMPLING_1,
PressureOversampling.OVERSAMPLING_1, HumidityOversampling.OVERSAMPLING_1,
OperatingMode.MODE_NORMAL);
setStandbyAndFilterModes(StandbyMode.STANDBY_1_S, FilterMode.FILTER_OFF);
}
private void readCoefficients() {
// Read 24 bytes of data from address 0x88(136)
ByteBuffer buffer = device.read(CALIB_00_REG, 26);
// Temp coefficients
digT1 = buffer.getShort() & 0xffff;
digT2 = buffer.getShort();
digT3 = buffer.getShort();
// Pressure coefficients
digP1 = buffer.getShort() & 0xffff;
digP2 = buffer.getShort();
digP3 = buffer.getShort();
digP4 = buffer.getShort();
digP5 = buffer.getShort();
digP6 = buffer.getShort();
digP7 = buffer.getShort();
digP8 = buffer.getShort();
digP9 = buffer.getShort();
// Skip 1 byte
buffer.get();
// Read 1 byte of data from address 0xA1(161)
digH1 = (short) (buffer.get() & 0xff);
// Read 7 bytes of data from address 0xE1(225)
buffer = device.read(CALIB_26_REG, 7);
// Humidity coefficients
digH2 = buffer.getShort();
digH3 = buffer.get() & 0xff;
byte b1_3 = buffer.get();
byte b1_4 = buffer.get();
digH4 = (b1_3 << 4) | (b1_4 & 0xF);
digH5 = ((b1_4 & 0xF0) >> 4) | (buffer.get() << 4);
digH6 = buffer.get();
}
public void setOperatingModes(TemperatureOversampling tempOversampling,
PressureOversampling pressOversampling, HumidityOversampling humOversampling,
OperatingMode operatingMode) {
// Humidity over sampling rate = 1
device.writeByte(CTRL_HUM_REG, humOversampling.getMask());
// Normal mode, temp and pressure oversampling rate = 1
device.writeByte(CTRL_MEAS_REG, (byte) (tempOversampling.getMask() |
pressOversampling.getMask() | operatingMode.getMask()));
}
public void setStandbyAndFilterModes(StandbyMode standbyMode, FilterMode filterMode) {
// Stand_by time = 1000 ms, filter off
device.writeByte(CONFIG_REG, (byte) (standbyMode.getMask() | filterMode.getMask()));
}
public float[] getValues() {
// Read the 3 pressure registers
ByteBuffer buffer = device.read(PRESS_MSB_REG, 8);
// Unpack the raw 20-bit unsigned pressure value
int adc_p = ((buffer.get() & 0xff) << 12) |
((buffer.get() & 0xff) << 4) |
((buffer.get() & 0xf0) >> 4);
// Unpack the raw 20-bit unsigned temperature value
int adc_t = ((buffer.get() & 0xff) << 12) |
((buffer.get() & 0xff) << 4) |
((buffer.get() & 0xf0) >> 4);
// Unpack the raw 16-bit unsigned humidity value
int adc_h = ((buffer.get() & 0xff) << 8) | (buffer.get() & 0xff);
System.out.println("adc_p=" + adc_p + ", adc_t=" + adc_t + ", adc_h=" + adc_h);
int tvar1 = (((adc_t >> 3) - (digT1 << 1)) * digT2) >> 11;
int tvar2 = (((((adc_t >> 4) - digT1) * ((adc_t >> 4) - digT1)) >> 12) * digT3) >> 14;
int t_fine = tvar1 + tvar2;
int temp = (t_fine * 5 + 128) >> 8;
long pvar1 = ((long) t_fine) - 128000;
long pvar2 = pvar1 * pvar1 * digP6;
pvar2 = pvar2 + ((pvar1 * digP5) << 17);
pvar2 = pvar2 + (((long) digP4) << 35);
pvar1 = ((pvar1 * pvar1 * digP3) >> 8) + ((pvar1 * digP2) << 12);
pvar1 = (((((long) 1) << 47) + pvar1)) * digP1 >> 33;
long pressure;
if (pvar1 == 0) {
pressure = 0; // Avoid exception caused by division by zero
} else {
pressure = 1048576 - adc_p;
pressure = (((pressure << 31) - pvar2) * 3125) / pvar1;
pvar1 = (digP9 * (pressure >> 13) * (pressure >> 13)) >> 25;
pvar2 = (digP8 * pressure) >> 19;
pressure = ((pressure + pvar1 + pvar2) >> 8) + (((long) digP7) << 4);
}
int v_x1_u32r = t_fine - 76800;
v_x1_u32r = ((((adc_h << 14) - (digH4 << 20) - (digH5 * v_x1_u32r)) + 16384) >> 15) *
(((((((v_x1_u32r * digH6) >> 10) * (((v_x1_u32r * digH3) >> 11) + 32768)) >> 10) + 2097152) * digH2 + 8192) >> 14);
v_x1_u32r = v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * digH1) >> 4);
v_x1_u32r = v_x1_u32r < 0 ? 0 : v_x1_u32r;
v_x1_u32r = v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r;
long humidity = ((long) v_x1_u32r) >> 12;
return new float[] { temp / 100.0f, pressure / 2560.0f, humidity / 1024.0f };
}
@Override
public float getTemperature() {
return getValues()[0];
}
@Override
public float getPressure() {
return getValues()[1];
}
@Override
public float getRelativeHumidity() {
return getValues()[2];
}
@Override
public void close() throws RuntimeIOException {
device.close();
}
}
