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/*
* Copyright (C) 2016 Inria
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_bmp180 BMP180 temperature and pressure sensor
* @ingroup drivers_sensors
* @brief Device driver interface for the BMP180 sensor.
* @{
*
* @file
* @brief Device driver interface for the BMP180 sensor.
*
* @author Alexandre Abadie <alexandre.abadie@inria.fr>
*/
#ifndef BMP180_H
#define BMP180_H
#include "saul.h"
#include "periph/i2c.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Oversampling modes
*/
typedef enum {
BMP180_ULTRALOWPOWER = 0,
BMP180_STANDARD,
BMP180_HIGHRES,
BMP180_ULTRAHIGHRES
} bmp180_oversampling_mode_t;
/**
* @brief Calibration struct for the BMP180 sensor
*/
typedef struct {
int16_t ac1; /**< ac1 coefficient */
int16_t ac2; /**< ac2 coefficient */
int16_t ac3; /**< ac3 coefficient */
int16_t b1; /**< b1 coefficient */
int16_t b2; /**< b2 coefficient */
int16_t mb; /**< mb coefficient */
int16_t mc; /**< mc coefficient */
int16_t md; /**< md coefficient */
uint16_t ac4; /**< ac4 coefficient */
uint16_t ac5; /**< ac5 coefficient */
uint16_t ac6; /**< ac6 coefficient */
} bmp180_calibration_t;
/**
* @brief Device initialization parameters
*/
typedef struct {
i2c_t i2c_dev; /**< I2C device which is used */
uint8_t i2c_addr; /**< I2C address */
bmp180_oversampling_mode_t oversampling; /**< Oversampling mode */
} bmp180_params_t;
/**
* @brief Device descriptor for the BMP180 sensor
*/
typedef struct {
bmp180_params_t params; /**< Device initialization parameters */
bmp180_calibration_t calibration; /**< Device calibration */
} bmp180_t;
/**
* @brief Status and error return codes
*/
enum {
BMP180_OK = 0, /**< everything was fine */
BMP180_ERR_NOI2C, /**< error initializing the I2C bus */
BMP180_ERR_NODEV, /**< did not detect BMP180 */
BMP180_ERR_NOCAL, /**< error when reading calibration values */
};
/**
* @brief Initialize the given BMP180 device
*
* @param[out] dev Initialized device descriptor of BMP180 device
* @param[in] params Initialization parameters
*
* @return BMP180_OK on success
* @return -BMP180_ERR_NOI2C if given I2C is not enabled in board config
* @return -BMP180_ERR_NODEV if not a BMP180 at given address
* @return -BMP180_ERR_NOCAL if an error occured when reading calibration values
*/
int bmp180_init(bmp180_t *dev, const bmp180_params_t *params);
/**
* @brief Read temperature value from the given BMP180 device, returned in d°C
*
* @param[in] dev Device descriptor of BMP180 device to read from
*
* @return Temperature in d°C
*/
int16_t bmp180_read_temperature(const bmp180_t *dev);
/**
* @brief Read pressure value from the given BMP180 device, returned in Pa
*
* @param[in] dev Device descriptor of BMP180 device to read from
*
* @return Pressure in Pa
*/
uint32_t bmp180_read_pressure(const bmp180_t *dev);
/**
* @brief Compute altitude, returned in m.
*
* @param[in] dev Device descriptor of BMP180 device to read from
* @param[in] pressure_0 The pressure at sea level in Pa
*
* @return Altitude in m
*/
int16_t bmp180_altitude(const bmp180_t *dev, uint32_t pressure_0);
/**
* @brief Compute pressure at sea level, returned in Pa.
*
* @param[in] dev Device descriptor of BMP180 device to read from
* @param[in] altitude Altitude in m
*
* @return Pressure at sea level in Pa
*/
uint32_t bmp180_sealevel_pressure(const bmp180_t *dev, int16_t altitude);
#ifdef __cplusplus
}
#endif
#endif /* BMP180_H */
/** @} */
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