mpl3115a2.hpp

/*
 * Author: William Penner <william.penner@intel.com>
 * Copyright (c) 2014 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 <math.h>

#define MPL3115A2_NAME        "mpl3115a2"

#define MPL3115A2_I2C_ADDRESS   0x60
#define MPL3115A2_DEVICE_ID     0xc4

#define MPL3115A2_STATUS        0x00
#define MPL3115A2_OUT_PRESS     0x01  /* MSB first, 20 bit */
#define MPL3115A2_OUT_TEMP      0x04  /* MSB first, 12 bit */
#define MPL3115A2_WHO_AM_I      0x0c
#define MPL3115A2_PT_DATA_CFG   0x13
#define MPL3115A2_P_MIN         0x1C
#define MPL3115A2_T_MIN         0x1F
#define MPL3115A2_P_MAX         0x21
#define MPL3115A2_T_MAX         0x24
#define MPL3115A2_CTRL_REG1     0x26

// CTRL_REG1
#define MPL3115A2_CTRL_SBYB     0x01  /* Standby (not) */
#define MPL3115A2_CTRL_OST      0x02  /* One-shot trigger */
#define MPL3115A2_CTRL_RESET    0x04  /* RESET device */
#define MPL3115A2_CTRL_ALT_MODE 0x80  /* Altitude mode */

#define MPL3115A2_SETOVERSAMPLE(a) ((a & 7) << 3)
#define MPL3115A2_GETOVERSAMPLE(a) ((a >> 3) & 7)
#define MPL3115A2_MAXOVERSAMPLE   7

namespace upm {

class MPL3115A2 {
    public:
        MPL3115A2(int bus, int devAddr=MPL3115A2_I2C_ADDRESS, uint8_t mode=6);

        int testSensor(void);

        int resetSensor(void);

        void dumpSensor(void);

        int sampleData(void);

        int32_t getPressureReg(int reg);

        int32_t getTempReg(int reg);

        float getPressure(int bSampleData = true);

        float getTemperature(int bSampleData = true);

        float getSealevelPressure(float altitudeMeters = 0.0);

        float getAltitude (float sealevelPressure = 101325.0);

        void setOversampling(uint8_t oversampling);

        uint8_t getOversampling(void);

        float getTemperatureMax(void);

        float getTemperatureMin(void);

        float getPressureMax (void);

        float getPressureMin (void);

        float convertTempCtoF(float fTemp);

        float convertPaToinHg(float fPressure);

        mraa::Result i2cWriteReg (uint8_t reg, uint8_t value);

        uint16_t i2cReadReg_16 (int reg);

        uint8_t i2cReadReg_8 (int reg);

    private:
        std::string m_name;

        int m_controlAddr;
        int m_bus;
        mraa::I2c m_i2ControlCtx;

        uint8_t m_oversampling;
        int32_t m_iPressure;
        int32_t m_iTemperature;
};

}