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bmp280, bme280: Initial implementation

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This library adds support for both the BMP280 and BME280 sesnors from
Bosch.  The BME is virtually identical to the BMP280 aside from some
slight register changes and adding support for a humidity sensor.

The BMP280 is an absolute barometric pressure sensor especially
designed for mobile applications. The sensor module is housed in an
extremely compact 8-pin metal-lid LGA package with a footprint of only
2.0 × 2.5 mm2 and 0.95 mm package height. Its small dimensions and its
low power consumption of 2.7 μA @1Hz allow the implementation in
battery driven devices such as mobile phones, GPS modules or watches.

The BME280 is as combined digital humidity, pressure and temperature
sensor based on proven sensing principles. The sensor module is housed
in an extremely compact metal-lid LGA package with a footprint of only
2.5 × 2.5 mm2 with a height of 0.93 mm. Its small dimensions and its
low power consumption allow the implementation in battery driven
devices such as handsets, GPS modules or watches. The BME280 is
register and performance compatible to the Bosch Sensortec BMP280
digital pressure sensor

These drivers support both I2C and SPI operation.

When using SPI on an Edison with the arduino breakout board, you
must specify a CS of -1 to the constructor, and connect the chip's
CS pin to arduino pin 10.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Noel Eck <noel.eck@intel.com>
This commit is contained in:
Jon Trulson
2016-05-04 12:47:39 -06:00
committed by Noel Eck
parent 84144d0c8f
commit 6241e20dda
18 changed files with 2073 additions and 0 deletions
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src/bmp280/bme280.hpp Normal file
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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2016 Intel Corporation.
*
* 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.
*/
#pragma once
#include <string>
#include <mraa/i2c.hpp>
#include <mraa/spi.hpp>
#include <mraa/gpio.hpp>
#include "upm/iHumiditySensor.hpp"
#include "bmp280.hpp"
#define BME280_DEFAULT_I2C_BUS 0
#define BME280_DEFAULT_SPI_BUS 0
#define BME280_DEFAULT_ADDR 0x77
#define BME280_DEFAULT_CHIPID 0x60
namespace upm {
/**
* @library bmp280
* @sensor bme280
* @comname BME280 Digital Humidity, Pressure, and Temperature Sensor
* @type pressure humidity
* @man adafruit
* @con i2c spi gpio
* @web https://www.adafruit.com/products/2652
*
* @brief API for the BME280 Digital Humidity, Pressure, and
* Temperature Sensor
*
* The BME280 is as combined digital humidity, pressure and
* temperature sensor based on proven sensing principles. The sensor
* module is housed in an extremely compact metal-lid LGA package
* with a footprint of only 2.5 × 2.5 mm2 with a height of 0.93
* mm. Its small dimensions and its low power consumption allow the
* implementation in battery driven devices such as handsets, GPS
* modules or watches. The BME280 is register and performance
* compatible to the Bosch Sensortec BMP280 digital pressure sensor
*
* @snippet bme280.cxx Interesting
*/
class BME280 : public BMP280, public IHumiditySensor {
public:
/**
* BMP280 registers
*/
typedef enum : uint8_t {
// Do not write into reserved bits.
// We only specify those registers specific to the BME280. The
// rest of them can be found in the BMP280 header file.
// read-only factory calibration data for humidity
REG_CALIB_DIG_H1 = 0xa1,
REG_CALIB_DIG_H2_LSB = 0xe1,
REG_CALIB_DIG_H2_MSB = 0xe2,
REG_CALIB_DIG_H3 = 0xe3,
REG_CALIB_DIG_H4_0 = 0xe4, // bits 8 -> 11:4
REG_CALIB_DIG_H4_1 = 0xe5, // bits 3:0 -> 3:0
REG_CALIB_DIG_H5_0 = 0xe5, // bits 7:4 -> 3:0
REG_CALIB_DIG_H5_1 = 0xe6, // bits 8 -> 11:4
REG_CALIB_DIG_H6 = 0xe7,
REG_CTRL_HUM = 0xf2,
REG_HUMIDITY_MSB = 0xfd,
REG_HUMIDITY_LSB = 0xfe
} BME280_REGS_T;
/**
* REG_CTRL_HUM bits
*/
typedef enum {
CTRL_HUM_OSRS_H0 = 0x01,
CTRL_HUM_OSRS_H1 = 0x02,
CTRL_HUM_OSRS_H2 = 0x04,
_CTRL_HUM_OSRS_H_MASK = 3,
_CTRL_HUM_OSRS_H_SHIFT = 0
// 0x08-0x80 reserved
} CTRL_HUM_T;
/**
* CTRL_HUM_OSRS_H values
*/
typedef enum {
OSRS_H_SKIPPED = 0,
OSRS_H_OVERSAMPLING_1 = 1, // x1
OSRS_H_OVERSAMPLING_2 = 2, // x2
OSRS_H_OVERSAMPLING_4 = 3,
OSRS_H_OVERSAMPLING_8 = 4,
OSRS_H_OVERSAMPLING_16 = 5
} OSRS_H_T;
/**
* BME280 constructor.
*
* This device can support both I2C and SPI. For SPI, set the addr
* to -1, and specify a positive integer representing the Chip
* Select (CS) pin for the cs argument. If you are using a
* hardware CS pin, then you can connect the proper pin to the
* hardware CS pin on your MCU and supply -1 for cs. The default
* operating mode is I2C.
*
* @param bus I2C or SPI bus to use.
* @param address The address for this device. -1 for SPI.
* @param cs The gpio pin to use for the SPI Chip Select. -1 for
* I2C or for SPI with a hardware controlled pin.
* @param theChipID The chip ID used for validation
*/
BME280(int bus=BME280_DEFAULT_I2C_BUS, int addr=BME280_DEFAULT_ADDR,
int cs=-1, uint8_t theChipID=BME280_DEFAULT_CHIPID);
/**
* BME280 Destructor.
*/
virtual ~BME280();
/**
* Update the internal stored values from sensor data.
*/
virtual void update();
/**
* Return the current measured relative humidity. update() must
* have been called prior to calling this method.
*
* @return The relative humidity in percent..
*/
float getHumidity();
/**
* Set a general usage mode. This function can be used to
* configure the filters and oversampling for a particular use
* case. These settings are documented in the BMP280 and BME280
* datasheets.
*
* @param mode One of the USAGE_MODE_T values.
*/
virtual void setUsageMode(USAGE_MODE_T mode);
/**
* Set the humidity sensor oversampling parameter. See the data
* sheet for details. This value can be automatically set to a
* suitable value by using one of the predefined modes for
* setUsageMode().
*
* @param mode One of the OSRS_H_T values.
*/
void setOversampleRateHumidity(OSRS_H_T rate);
// Interface support
const char *getModuleName()
{
return "BME280";
};
int getHumidityRelative()
{
return int(getHumidity());
};
protected:
// relative humidity
float m_humidity;
// read the calibration data
virtual void readCalibrationData();
private:
// calibration data humidity
uint8_t m_dig_H1;
int16_t m_dig_H2;
uint8_t m_dig_H3;
int16_t m_dig_H4;
int16_t m_dig_H5;
int8_t m_dig_H6;
// Bosch supplied conversion/compensation functions from the
// datasheet.
uint32_t bme280_compensate_H_int32(int32_t adc_H);
};
}