bmp280.h

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/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2016-2017 Intel Corporation.
 *
 * The MIT License
 *
 * 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 <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <upm.h>

#include <mraa/i2c.h>
#include <mraa/spi.h>
#include <mraa/gpio.h>

#include "bmp280_regs.h"

#ifdef __cplusplus
extern "C" {
#endif

    typedef struct _bmp280_context {
        mraa_i2c_context i2c;
        mraa_gpio_context gpio;
        mraa_spi_context spi;

        // are we doing SPI?
        bool isSPI;

        // are we using a bme280?
        bool isBME;

        // always stored in C
        float temperature;

        // pressure in Pa
        float pressure;

        // humidity (relative)
        float humidity;

        // sea level pressure in hectoPascals (hPa)
        float sea_level_hPA;

        // shared calibration data - set in temp conversion, used in
        // pressure conversion.
        int32_t t_fine;

        // current operating mode.  BMP280_MODE_FORCED requires
        // special attention in update()
        BMP280_MODES_T mode;

        // calibration data temperature
        uint16_t dig_T1;
        int16_t dig_T2;
        int16_t dig_T3;

        // calibration data pressure
        uint16_t dig_P1;
        int16_t dig_P2;
        int16_t dig_P3;
        int16_t dig_P4;
        int16_t dig_P5;
        int16_t dig_P6;
        int16_t dig_P7;
        int16_t dig_P8;
        int16_t dig_P9;

        // calibration data humidity (BME280 only)
        uint8_t dig_H1;
        int16_t dig_H2;
        uint8_t dig_H3;
        int16_t dig_H4;
        int16_t dig_H5;
        int8_t dig_H6;
    } *bmp280_context;

    bmp280_context bmp280_init(int bus, int addr, int cs);

    void bmp280_close(bmp280_context dev);

    upm_result_t bmp280_update(const bmp280_context dev);

    uint8_t bmp280_get_chip_id(const bmp280_context dev);

    void bmp280_reset(const bmp280_context dev);

    float bmp280_get_temperature(const bmp280_context dev);

    float bmp280_get_humidity(const bmp280_context dev);

    float bmp280_get_pressure(const bmp280_context dev);

    void bmp280_set_sea_level_pressure(const bmp280_context dev,
                                       float seaLevelhPA);

    float bmp280_get_altitude(const bmp280_context dev);

    void bmp280_set_usage_mode(const bmp280_context dev,
                               BMP280_USAGE_MODE_T mode);

    void bmp280_set_oversample_rate_temperature(const bmp280_context dev,
                                                BMP280_OSRS_T_T rate);

    void bmp280_set_oversample_rate_pressure(const bmp280_context dev,
                                             BMP280_OSRS_P_T rate);

    void bmp280_set_oversample_rate_humidity(const bmp280_context dev,
                                             BME280_OSRS_H_T rate);

    void bmp280_set_timer_standby(const bmp280_context dev,
                                  BMP280_T_SB_T tsb);

    void bmp280_set_filter(const bmp280_context dev, BMP280_FILTER_T filter);

    void bmp280_set_measure_mode(const bmp280_context dev,
                                 BMP280_MODES_T mode);

    uint8_t bmp280_get_status(const bmp280_context dev);

    uint8_t bmp280_read_reg(const bmp280_context dev, uint8_t reg);

    int bmp280_read_regs(const bmp280_context dev,
                         uint8_t reg, uint8_t *buffer, int len);

    upm_result_t bmp280_write_reg(const bmp280_context dev,
                                  uint8_t reg, uint8_t val);

#ifdef __cplusplus
}
#endif