Browse Source

drivers/isl29125: initial import

dev/timer
Ludwig Ortmann 8 years ago
parent
commit
0db92da19d
  1. 3
      drivers/Makefile.include
  2. 155
      drivers/include/isl29125.h
  3. 1
      drivers/isl29125/Makefile
  4. 93
      drivers/isl29125/include/isl29125-internal.h
  5. 155
      drivers/isl29125/isl29125.c

3
drivers/Makefile.include

@ -19,6 +19,9 @@ endif
ifneq (,$(filter isl29020,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/drivers/isl29020/include
endif
ifneq (,$(filter isl29125,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/drivers/isl29125/include
endif
ifneq (,$(filter lps331ap,$(USEMODULE)))
USEMODULE_INCLUDES += $(RIOTBASE)/drivers/lps331ap/include
endif

155
drivers/include/isl29125.h

@ -0,0 +1,155 @@
/*
* Copyright 2015 Ludwig Ortmann
*
* 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 driver_isl29125 ISL29125 light sensor
* @ingroup drivers
* @brief Device driver for the ISL29125 RGB light sensor
*
* ## Description
*
* The device supports level conversion in 12, and 16 bit depth per
* channel. Selecting a higher precision results in a longer
* conversion time.
*
* The driver uses the @ref color_rgb_t color definition from @ref
* color.h for value representation. It does not depend on the color
* module however.
*
* ## Usage
*
* Examine `tests/driver_isr29125` for an exemplary application using
* this driver.
*
* ## Caveats
*
* A GPIO pin definition has been included in the interface for future
* compatibility only.
* - The driver does not support SYNC mode at the moment.
* - The driver supports polling only, i.e. interrupt mode is
* currently not supported.
*
* @{
*
* @file
* @brief Device driver interface for the ISL29125 RGB light sensor
*
* @author Ludwig Ortmann <ludwig.ortmann@fu-berlin.de
*/
#ifndef ISL29125_H
#define ISL29125_H
#include <stdint.h>
#include "periph/i2c.h"
#include "periph/gpio.h"
#include "color.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief data type for storing lux RGB sensor readings
*/
typedef struct {
float red; /**< red lux value */
float green; /**< green lux value */
float blue; /**< blue lux value */
} isl29125_rgb_t;
/**
* @brief supported operation modes of the ISL29125 sensor's AD
* conversion
*/
typedef enum {
ISL29125_MODE_DOWN = 0x00, /**< ADC powered down */
ISL29125_MODE_STANDBY = 0x04, /**< AD conversion not performed */
ISL29125_MODE_RGB = 0x05, /**< RGB conversion */
ISL29125_MODE_R = 0x02, /**< red conversion only */
ISL29125_MODE_G = 0x01, /**< green conversion only */
ISL29125_MODE_B = 0x03, /**< blue conversion only */
ISL29125_MODE_RG = 0x06, /**< red and green conversion only */
ISL29125_MODE_GB = 0x07 /**< green and blue conversion only */
} isl29125_mode_t;
/**
* @brief supported RGB sensing range values of the ISL29125 sensor
*/
typedef enum {
ISL29125_RANGE_375 = 0x00, /**< range: 5.7m - 375 lux */
ISL29125_RANGE_10K = 0x08 /**< range: 0.152 - 10,000 lux */
} isl29125_range_t;
/**
* @brief supported color resolutions of the ISL29125 sensor's AD
* conversion
*/
typedef enum {
ISL29125_RESOLUTION_12 = 0x10, /**< resolution: 12 bit */
ISL29125_RESOLUTION_16 = 0x00 /**< resolution: 16 bit */
} isl29125_resolution_t;
/**
* @brief Device descriptor for ISL29125 sensors
*/
typedef struct {
i2c_t i2c; /**< I2C device the sensor is connected to */
gpio_t gpio; /**< GPIO pin for interrupt/sync mode */
isl29125_range_t range; /**< sensor range */
isl29125_resolution_t res; /**< sensor resolution */
} isl29125_t;
/**
* @brief initialize a new ISL29125 device
*
* @param[in] dev device descriptor of an ISL29125 device
* @param[in] i2c I2C device the sensor is connected to
* @param[in] gpio GPIO pin for interrupt/sync mode (currently unused)
* @param[in] mode operation mode
* @param[in] range measurement range
* @param[in] resolution AD conversion resolution
*
* @return 0 on success
* @return -1 on error
*/
int isl29125_init(isl29125_t *dev, i2c_t i2c, gpio_t gpio,
isl29125_mode_t mode, isl29125_range_t range,
isl29125_resolution_t resolution);
/**
* @brief read RGB values from device
*
* @param[in] dev device descriptor of an ISL29125 device
* @param[in] dest pointer to lux RGB color object data is written to
*/
void isl29125_read_rgb_lux(isl29125_t *dev, isl29125_rgb_t *dest);
/**
* @brief read color values from device
*
* @param[in] dev device descriptor of an ISL29125 device
* @param[in] dest pointer to RGB color object data is written to
*/
void isl29125_read_rgb_color(isl29125_t *dev, color_rgb_t *dest);
/**
* @brief set the device's operation mode
*
* @param[in] dev device descriptor of an ISL29125 device
* @param[in] mode operation mode
*/
void isl29125_set_mode(isl29125_t *dev, isl29125_mode_t mode);
#ifdef __cplusplus
}
#endif
#endif /* ISL29125_H */
/** @} */

1
drivers/isl29125/Makefile

@ -0,0 +1 @@
include $(RIOTBASE)/Makefile.base

93
drivers/isl29125/include/isl29125-internal.h

@ -0,0 +1,93 @@
/*
* Copyright 2015 Ludwig Ortmann
*
* 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.
*/
/**
* @ingroup driver_isl29125
* @{
*
* @file
* @brief Definitions for the ISL29125 RGB light sensor
*
* @author Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
*/
#ifndef ISL29125_INTERNAL_H
#define ISL29125_INTERNAL_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief The sensors hard coded I2C address
*/
#define ISL29125_I2C_ADDRESS 0x44
/**
* @name ISL29125 constants
* @{
*/
#define ISL29125_ID 0x7D
/** @} */
/**
* @name ISL29125 register map
* @{
*/
/* main register */
#define ISL29125_REG_ID 0x00
#define ISL29125_REG_RESET 0x00
/* configuration registers */
#define ISL29125_REG_CONF1 0x01
#define ISL29125_REG_CONF2 0x02
#define ISL29125_REG_CONF3 0x03
/* interrupt mode threshold registers */
#define ISL29125_REG_LTHLB 0x04
#define ISL29125_REG_LTHHB 0x05
#define ISL29125_REG_HTHLB 0x06
#define ISL29125_REG_HTHHB 0x07
/* status register */
#define ISL29125_REG_STATUS 0x08
/* sensor readout registers (double buffered) */
#define ISL29125_REG_GDLB 0x09
#define ISL29125_REG_GDHB 0x0A
#define ISL29125_REG_RDLB 0x0B
#define ISL29125_REG_RDHB 0x0C
#define ISL29125_REG_BDLB 0x0D
#define ISL29125_REG_BDHB 0x0E
/** @} */
/**
* @name ISL29125 commands
* @{
*/
#define ISL29125_CMD_RESET 0x46
/** @} */
/**
* @name ISL29125 configuration masks and bits
* @{
*/
/* ISL29125_REG_CONF1 B2:B0 */
#define ISL29125_CON1_MASK_MODE 0x07
/* ISL29125_REG_CONF1 B3 */
#define ISL29125_CON1_MASK_RANGE 0x08
/* ISL29125_REG_CONF1 B4 */
#define ISL29125_CON1_MASK_RES 0x10
/* ISL29125_REG_CONF1 B5 */
#define ISL29125_CON1_MASK_SYNC 0x20
#define ISL29125_CON1_SYNCOFF 0x00
#define ISL29125_CON1_SYNCON 0x20
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* ISL29125_INTERNAL_H */
/** @} */

155
drivers/isl29125/isl29125.c

@ -0,0 +1,155 @@
/*
* Copyright 2015 Ludwig Ortmann
*
* 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.
*/
/**
* @ingroup driver_isl29125
* @{
*
* @file
* @brief Device driver implementation for the ISL29125 RGB light sensor
*
* @author Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
*
* @}
*/
#include <stdint.h>
#include "isl29125.h"
#include "isl29125-internal.h"
#include "periph/i2c.h"
#include "periph/gpio.h"
#include "color.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
/***********************************************************************
* public API implementation
**********************************************************************/
int isl29125_init(isl29125_t *dev, i2c_t i2c, gpio_t gpio,
isl29125_mode_t mode, isl29125_range_t range,
isl29125_resolution_t resolution)
{
DEBUG("isl29125_init\n");
/* initialize device descriptor */
dev->i2c = i2c;
dev->res = resolution;
dev->range = range;
dev->gpio = gpio;
/* configuration 1: operation mode, range, resolution */
char conf1 = 0x00;
conf1 |= mode;
conf1 |= range;
conf1 |= resolution;
conf1 |= ISL29125_CON1_SYNCOFF; /* TODO: implement SYNC mode configuration */
/* TODO: implement configuration 2: infrared compensation configuration */
/* TODO: implement configuration 3: interrupt mode configuration */
/* acquire exclusive access to the bus */
DEBUG("isl29125_init: i2c_acquire\n");
(void) i2c_acquire(dev->i2c);
/* initialize the I2C bus */
DEBUG("isl29125_init: i2c_init_master\n");
(void) i2c_init_master(i2c, I2C_SPEED_NORMAL);
/* verify the device ID */
DEBUG("isl29125_init: i2c_read_reg\n");
char reg_id;
int ret = i2c_read_reg(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_ID, &reg_id);
if ((reg_id == ISL29125_ID) && (ret == 1)) {
DEBUG("isl29125_init: ID successfully verified\n");
}
else {
DEBUG("isl29125_init: ID could not be verified, ret: %i\n", ret);
(void) i2c_release(dev->i2c);
return -1;
}
/* configure and enable the sensor */
DEBUG("isl29125_init: i2c_write_reg(ISL29125_REG_RESET)\n");
(void) i2c_write_reg(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_RESET, ISL29125_CMD_RESET);
DEBUG("isl29125_init: i2c_write_reg(ISL29125_REG_CONF1)\n");
(void) i2c_write_reg(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_CONF1, conf1);
/* release the I2C bus */
DEBUG("isl29125_init: i2c_release\n");
(void) i2c_release(dev->i2c);
DEBUG("isl29125_init: success\n");
return 0;
}
void isl29125_read_rgb_lux(isl29125_t *dev, isl29125_rgb_t *dest)
{
/* acquire exclusive access to the bus */
(void) i2c_acquire(dev->i2c);
/* read values */
char bytes[6];
(void) i2c_read_regs(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_GDLB, bytes, 6);
/* release the I2C bus */
(void) i2c_release(dev->i2c);
/* possibly shift by 4 to normalize 12 to 16 bit */
int resfactor = (dev->res == ISL29125_RESOLUTION_12) ? 4 : 0;
/* parse and normalize readings */
uint16_t green = (bytes[0] | (bytes[1] << 8)) << resfactor;
uint16_t red = (bytes[2] | (bytes[3] << 8)) << resfactor;
uint16_t blue = (bytes[4] | (bytes[5] << 8)) << resfactor;
DEBUG("isl29125_read_rgb: adjusted, unconverted readings: (%5i / %5i / %5i) \n", red, green, blue);
/* convert readings to lux */
float luxfactor = (dev->range == ISL29125_RANGE_10K) ? 10000.0 / 65535.0 : 375.0 / 65535.0;
dest->red = red * luxfactor;
dest->green = green * luxfactor;
dest->blue = blue * luxfactor;
}
void isl29125_read_rgb_color(isl29125_t *dev, color_rgb_t *dest)
{
/* acquire exclusive access to the bus */
(void) i2c_acquire(dev->i2c);
/* read values */
char bytes[6];
(void) i2c_read_regs(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_GDLB, bytes, 6);
/* release the I2C bus */
(void) i2c_release(dev->i2c);
/* factor normalize 12 or 16 bit to 8 bit */
int normfactor = (dev->res == ISL29125_RESOLUTION_12) ? 4 : 8;
/* parse and normalize readings */
dest->g = (bytes[0] | (bytes[1] << 8)) >> normfactor;
dest->r = (bytes[2] | (bytes[3] << 8)) >> normfactor;
dest->b = (bytes[4] | (bytes[5] << 8)) >> normfactor;
}
void isl29125_set_mode(isl29125_t *dev, isl29125_mode_t mode)
{
char conf1;
(void) i2c_acquire(dev->i2c);
(void) i2c_read_reg(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_CONF1, &conf1);
conf1 &= ~ISL29125_CON1_MASK_MODE;
conf1 |= mode;
(void) i2c_write_reg(dev->i2c, ISL29125_I2C_ADDRESS, ISL29125_REG_CONF1, conf1);
(void) i2c_release(dev->i2c);
}
Loading…
Cancel
Save