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/*
* Copyright (C) 2014 Freie Universitรคt Berlin
*
* 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_isl29020 ISL29020 light sensor
* @ingroup drivers_sensors
* @brief Device driver for the ISL29020 light sensor
* @{
*
* @file
* @brief Device driver interface for the ISL29020 light sensor
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef ISL29020_H
#define ISL29020_H
#include <stdint.h>
#include "periph/i2c.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief The sensors default I2C address
*/
#define ISL29020_DEFAULT_ADDRESS 0x44
/**
* @brief Device descriptor for ISL29020 sensors
*/
typedef struct {
i2c_t i2c; /**< I2C device the sensor is connected to */
uint8_t address; /**< I2C bus address of the sensor */
float lux_fac; /**< factor to calculate actual lux value */
} isl29020_t;
/**
* @brief Possible modes for the ISL29020 sensor
*/
typedef enum {
ISL29020_MODE_AMBIENT = 0, /**< set sensor to detect ambient light */
ISL29020_MODE_IR = 1 /**< set sensor to detect infrared light */
} isl29020_mode_t;
/**
* @brief Possible range values for the ISL29020 sensor
*/
typedef enum {
ISL29020_RANGE_1K = 0, /**< set range to 0-1000 lux */
ISL29020_RANGE_4K = 1, /**< set range to 0-4000 lux */
ISL29020_RANGE_16K = 2, /**< set range to 0-16000 lux */
ISL29020_RANGE_64K = 3 /**< set range to 0-64000 lux */
} isl29020_range_t;
/**
* @brief Data structure holding the full set of configuration parameters
*/
typedef struct {
i2c_t i2c; /**< I2C bus the device is connected to */
uint8_t addr; /**< address on that bus */
isl29020_range_t range; /**< range setting to use */
isl29020_mode_t mode; /**< measurement mode to use */
} isl29020_params_t;
/**
* @brief Initialize a new ISL29020 device
*
* @param[in] dev device descriptor of an ISL29020 device
* @param[in] i2c I2C device the sensor is connected to
* @param[in] address I2C address of the sensor
* @param[in] range measurement range
* @param[in] mode configure if sensor reacts to ambient or infrared light
*
* @return 0 on success
* @return -1 on error
*/
int isl29020_init(isl29020_t *dev, i2c_t i2c, uint8_t address,
isl29020_range_t range, isl29020_mode_t mode);
/**
* @brief Read a lighting value from the sensor, the result is given in lux
*
* @param[in] dev device descriptor of an ISL29020 device
*
* @return the measured brightness in lux
* @return -1 on error
*/
int isl29020_read(isl29020_t *dev);
/**
* @brief Enable the given sensor
*
* @param[in] dev device descriptor of an ISL29020 device
*
* @return 0 on success
* @return -1 on error
*/
int isl29020_enable(isl29020_t *dev);
/**
* @brief Disable the given sensor
*
* @param[in] dev device descriptor of an ISL29020 device
*
* @return 0 on success
* @return -1 on error
*/
int isl29020_disable(isl29020_t *dev);
#ifdef __cplusplus
}
#endif
#endif /* ISL29020_H */
/** @} */
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