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drivers: added driver for ISL29020 light sensor
This commit is contained in:
Hauke Petersen
parent
5d08a0e30c
commit
0f7e8b2f9f
@ -43,5 +43,8 @@ endif
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ifneq (,$(filter netdev_base,$(USEMODULE)))
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DIRS += netdev/base
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endif
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ifneq (,$(filter isl29020,$(USEMODULE)))
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DIRS += isl29020
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endif
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include $(RIOTBASE)/Makefile.base
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@ -10,3 +10,6 @@ endif
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ifneq (,$(filter at86rf231,$(USEMODULE)))
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USEMODULE_INCLUDES += $(RIOTBASE)/drivers/at86rf231/include
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endif
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ifneq (,$(filter isl29020,$(USEMODULE)))
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USEMODULE_INCLUDES += $(RIOTBASE)/drivers/isl29020/include
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endif
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105
drivers/include/isl29020.h
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105
drivers/include/isl29020.h
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@ -0,0 +1,105 @@
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/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup driver_isl29020 ISL29020 light sensor
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* @ingroup drivers
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* @brief Device driver for the ISL29020 light sensor
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* @{
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*
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* @file
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* @brief Device driver interface for the ISL29020 light sensor
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef __ISL29020_H
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#define __ISL29020_H
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#include <stdint.h>
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#include "periph/i2c.h"
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/**
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* @brief The sensors default I2C address
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*/
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#define ISL29020_DEFAULT_ADDRESS 0x44
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/**
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* @brief Device descriptor for ISL29020 sensors
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*/
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typedef struct {
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i2c_t i2c; /**< I2C device the sensor is connected to */
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uint8_t address; /**< I2C bus address of the sensor */
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float lux_fac; /**< factor to calculate actual LUX value */
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} isl29020_t;
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/**
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* @brief Possible modes for the ISR29020 sensor
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*/
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typedef enum {
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ISL29020_MODE_AMBIENT = 0, /**< set sensor to detect ambient light */
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ISL29020_MODE_IR = 1 /**< set sensor to detect infrared light */
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} isl29020_mode_t;
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/**
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* @brief Possible range values for the ISR29020 sensor
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*/
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typedef enum {
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ISL29020_RANGE_1K = 0, /**< set range to 0-1000 LUX */
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ISL29020_RANGE_4K = 1, /**< set range to 0-4000 LUX */
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ISL29020_RANGE_16K = 2, /**< set range to 0-16000 LUX */
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ISL29020_RANGE_64K = 3 /**< set range to 0-64000 LUX */
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} isl29020_range_t;
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/**
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* @brief Initialize a new ISL29020 device
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*
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* @param[in] dev device descriptor of an ISL29020 device
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* @param[in] i2c I2C device the sensor is connected to
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* @param[in] address I2C address of the sensor
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* @param[in] range measurement range
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* @param[in] mode configure if sensor reacts to ambient or infrared light
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*
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* @return 0 on success
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* @return -1 on error
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*/
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int isl29020_init(isl29020_t *dev, i2c_t i2c, uint8_t address,
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isl29020_range_t range, isl29020_mode_t mode);
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/**
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* @brief Read a lighting value from the sensor, the result is given in LUX
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*
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* @param[in] dev device descriptor of an ISL29020 device
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*
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* @return the measured brightness in LUX
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* @return -1 on error
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*/
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int isl29020_read(isl29020_t *dev);
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/**
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* @brief Enable the given sensor
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*
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* @param[in] dev device descriptor of an ISL29020 device
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*
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* @return 0 on success
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* @return -1 on error
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*/
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int isl29020_enable(isl29020_t *dev);
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/**
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* @brief Disable the given sensor
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*
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* @param[in] dev device descriptor of an ISL29020 device
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*
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* @return 0 on success
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* @return -1 on error
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*/
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int isl29020_disable(isl29020_t *dev);
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#endif /* __ISL29020_H */
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/** @} */
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3
drivers/isl29020/Makefile
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3
drivers/isl29020/Makefile
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@ -0,0 +1,3 @@
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MODULE = isl29020
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include $(RIOTBASE)/Makefile.base
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65
drivers/isl29020/include/isl29020-internal.h
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65
drivers/isl29020/include/isl29020-internal.h
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@ -0,0 +1,65 @@
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/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup driver_isl29020
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* @{
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*
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* @file
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* @brief Definitions for the ISL29020 light sensor
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef __ISL29020_INTERNAL_H
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#define __ISL29020_INTERNAL_H
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/**
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* @name ISL29020 registers
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* @{
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*/
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#define ISL29020_REG_CMD 0x00
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#define ISL29020_REG_LDATA 0x01
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#define ISL29020_REG_HDATA 0x02
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/** @} */
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/**
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* @name Masks for the ISL29020 command register
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* @{
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*/
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#define ISL29020_CMD_EN 0x80
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#define ISL29020_CMD_MODE 0x40
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#define ISL29020_CMD_LIGHT 0x20
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#define ISL29020_CMD_RES 0x1c
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#define ISL29020_CMD_RAGNE 0x03
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/** @} */
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/**
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* @name Resolution options
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* @{
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*/
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#define ISL29020_RES_INT_16 0x00
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#define ISL29020_RES_INT_12 0x04
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#define ISL29020_RES_INT_8 0x08
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#define ISL29020_RES_INT_4 0x0c
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#define ISL29020_RES_EXT_ADC 0x10
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#define ISL29020_RES_EXT_TIM 0x14
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/** @} */
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/**
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* @name Range options
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* @{
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*/
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#define ISL29020_RANGE_1 0x00
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#define ISL29020_RANGE_2 0x01
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#define ISL29020_RANGE_3 0x02
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#define ISL29020_RANGE_4 0x03
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/** @} */
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#endif /* __ISL29020_INTERNAL_H */
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/** @} */
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100
drivers/isl29020/isl29020.c
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100
drivers/isl29020/isl29020.c
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@ -0,0 +1,100 @@
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/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup driver_isl29020
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* @{
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*
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* @file
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* @brief Device driver implementation for the ISL29020 light sensor
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include "isl29020.h"
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#include "isl29020-internal.h"
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#include "periph/i2c.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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int isl29020_init(isl29020_t *dev, i2c_t i2c, uint8_t address,
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isl29020_range_t range, isl29020_mode_t mode)
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{
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int res;
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char tmp;
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/* initialize device descriptor */
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dev->i2c = i2c;
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dev->address = address;
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dev->lux_fac = (float)((1 << (10 + (2 * range))) - 1) / 0xffff;
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/* initialize the I2C bus */
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i2c_init_master(i2c, I2C_SPEED_NORMAL);
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/* configure and enable the sensor */
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tmp = ISL29020_CMD_EN | ISL29020_CMD_MODE | ISL29020_RES_INT_16 | range | (mode << 5);
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res = i2c_write_reg(dev->i2c, address, ISL29020_REG_CMD, tmp);
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if (res < 1) {
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return -1;
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}
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return 0;
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}
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int isl29020_read(isl29020_t *dev)
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{
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char low, high;
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uint16_t res;
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/* read lightning value */
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res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_LDATA, &low);
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res += i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_HDATA, &high);
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if (res < 2) {
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return -1;
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}
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res = (high << 8) | low;
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DEBUG("ISL29020: Raw value: %i - high: %i, low: %i\n", res, high, low);
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/* calculate and return actually LUX value */
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return (int)(dev->lux_fac * res);
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}
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int isl29020_enable(isl29020_t *dev)
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{
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int res;
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char tmp;
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res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_CMD, &tmp);
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if (res < 1) {
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return -1;
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}
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tmp |= ISL29020_CMD_EN;
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res = i2c_write_reg(dev->i2c, dev->address, ISL29020_REG_CMD, tmp);
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if (res < 1) {
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return -1;
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}
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return 0;
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}
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int isl29020_disable(isl29020_t *dev)
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{
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int res;
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char tmp;
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res = i2c_read_reg(dev->i2c, dev->address, ISL29020_REG_CMD, &tmp);
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if (res < 1) {
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return -1;
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}
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tmp &= ~(ISL29020_CMD_EN);
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res = i2c_write_reg(dev->i2c, dev->address, ISL29020_REG_CMD, tmp);
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if (res < 1) {
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return -1;
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}
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return 0;
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}
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