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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
* @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
/**
* @name Oversampling modes
* @{
*/
#define BMP180_ULTRALOWPOWER (0)
#define BMP180_STANDARD (1)
#define BMP180_HIGHRES (2)
#define BMP180_ULTRAHIGHRES (3)
/** @} */
/**
* @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 descriptor for the BMP180 sensor
*/
typedef struct {
i2c_t i2c_dev; /**< I2C device which is used */
bmp180_calibration_t calibration; /**< Device calibration */
uint8_t oversampling; /**< Oversampling mode */
} bmp180_t;
/**
* @brief Device initialization parameters
*/
typedef struct {
i2c_t i2c_dev; /**< I2C device which is used */
uint8_t mode; /**< Oversampling mode */
} bmp180_params_t;
/**
* @brief export SAUL endpoints
* @{
*/
extern const saul_driver_t bmp180_temperature_saul_driver;
extern const saul_driver_t bmp180_pressure_saul_driver;
/** @} */
/**
* @brief Initialize the given BMP180 device
*
* @param[out] dev Initialized device descriptor of BMP180 device
* @param[in] i2c I2C bus the sensor is connected to
* @param[in] mode BMP180 oversampling mode
*
* @return 0 on success
* @return -1 if given I2C is not enabled in board config
*/
int bmp180_init(bmp180_t *dev, i2c_t i2c, uint8_t mode);
/**
* @brief Read temperature value from the given BMP180 device, returned in d°C
*
* @param[in] dev Device descriptor of BMP180 device to read from
* @param[out] temperature Temperature in d°C
*
* @return 0 on success
* @return -1 if device's I2C is not enabled in board config
*/
int bmp180_read_temperature(bmp180_t *dev, int32_t *temperature);
/**
* @brief Read pressure value from the given BMP180 device, returned in Pa
*
* @param[in] dev Device descriptor of BMP180 device to read from
* @param[out] pressure Pressure in Pa
*
* @return 0 on success
* @return -1 if device's I2C is not enabled in board config
*/
int bmp180_read_pressure(bmp180_t *dev, int32_t *pressure);
/**
* @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
* @param[out] altitude Altitude in m
*
* @return 0 on success
* @return -1 if device's I2C is not enabled in board config
*/
int bmp180_altitude(bmp180_t *dev, int32_t pressure_0, int32_t *altitude);
/**
* @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
* @param[out] pressure_0 Pressure at sea level in Pa
*
* @return 0 on success
* @return -1 if device's I2C is not enabled in board config
*/
int bmp180_sealevel_pressure(bmp180_t *dev, int32_t altitude, int32_t *pressure_0);
#ifdef __cplusplus
}
#endif
#endif /* BMP180_H_ */
/** @} */
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