hmc5883l.h

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/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2017 Intel Corporation.
 *
 * Ported based on original C++ code by:
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Contributions: Mihai Tudor Panu <mihai.tudor.panu@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 <stdint.h>
#include <stdlib.h>
#include <unistd.h>

#include <upm.h>
#include <mraa/i2c.h>

#ifdef __cplusplus
extern "C" {
#endif

    typedef struct _hmc5883l_context {
        mraa_i2c_context i2c;

        int16_t coords[3];
        float   declination;
    } *hmc5883l_context;


    hmc5883l_context hmc5883l_init(int bus);

    void hmc5883l_close(hmc5883l_context dev);

    upm_result_t hmc5883l_update(const hmc5883l_context dev);

    /*
     * Returns the direction.  hmc5883l_update() must have been called
     * prior to calling this function.
     *
     * @param Device context
     * @return Direction
     */
    float hmc5883l_direction(const hmc5883l_context dev);

    /*
     * Returns the heading.  hmc5883l_update() must have been called
     * prior to calling this function.
     *
     * @param Device context
     * @return Heading
     */
    float hmc5883l_heading(const hmc5883l_context dev);

    const int16_t *hmc5883l_coordinates(const hmc5883l_context dev);

    void hmc5883l_set_declination(const hmc5883l_context dev, float dec);

    float hmc5883l_get_declination(const hmc5883l_context dev);

#ifdef __cplusplus
}
#endif