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drivers/sensors/mlx90614.c: Add support for the Infrared Thermometer MLX90614

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This commit is contained in:
Alan Carvalho de Assis 2018-10-28 15:58:14 -06:00 committed by Gregory Nutt
parent 34db6d1433
commit 9689448d2a
5 changed files with 676 additions and 0 deletions
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16
drivers/sensors/Kconfig
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@ -320,6 +320,22 @@ config SENSORS_MLX90393
---help--- ---help---
Enable driver support for the Melex MLX90393 3-Axis magnetometer. Enable driver support for the Melex MLX90393 3-Axis magnetometer.
config SENSORS_MLX90614
bool "MLX90614 Infrared Thermometer"
default n
select I2C
---help---
Enable driver support for the Melexis MLX90614 Infrared Thermometer.
if SENSORS_MLX90614
config MLX90614_CRC
bool "Enable CRC Checking (verify if PEC field is valid)"
default n
---help---
Enable checking of CRC-8 (PEC field) checking to guarantee that
read data is valid.
endif
config SENSORS_MCP9844 config SENSORS_MCP9844
bool "MCP9844 Temperature Sensor" bool "MCP9844 Temperature Sensor"
default n default n

4
drivers/sensors/Make.defs
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@ -133,6 +133,10 @@ ifeq ($(CONFIG_SENSORS_MLX90393),y)
CSRCS += mlx90393.c CSRCS += mlx90393.c
endif endif
ifeq ($(CONFIG_SENSORS_MLX90614),y)
CSRCS += mlx90614.c
endif
ifeq ($(CONFIG_SENSORS_MS58XX),y) ifeq ($(CONFIG_SENSORS_MS58XX),y)
CSRCS += ms58xx.c CSRCS += ms58xx.c
endif endif

464
drivers/sensors/mlx90614.c Normal file
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@ -0,0 +1,464 @@
/****************************************************************************
* drivers/sensors/mlx90614.c
* Character driver for the Melexis MLX90614 Infrared Thermometer
*
* Copyright (C) 2018 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <errno.h>
#include <debug.h>
#include <stdlib.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/sensors/ioctl.h>
#include <nuttx/sensors/mlx90614.h>
#include <nuttx/random.h>
#ifdef CONFIG_MLX90614_CRC
#include <crc8.h>
#endif
#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_MLX90614)
/****************************************************************************
* Pre-process Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct mlx90614_dev_s
{
FAR struct i2c_master_s *i2c; /* I2C interface */
uint8_t addr; /* I2C address */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* I2C Helpers */
static int mlx90614_read_word(FAR struct mlx90614_dev_s *priv,
uint8_t cmd, FAR uint16_t *regval);
static int mlx90614_write_word(FAR struct mlx90614_dev_s *priv,
uint8_t cmd, uint16_t regval);
/* Character driver methods */
static int mlx90614_open(FAR struct file *filep);
static int mlx90614_close(FAR struct file *filep);
static ssize_t mlx90614_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t mlx90614_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen);
static int mlx90614_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_mlx90614_fops =
{
mlx90614_open, /* open */
mlx90614_close, /* close */
mlx90614_read, /* read */
mlx90614_write, /* write */
NULL, /* seek */
mlx90614_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, NULL /* poll */
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mlx90614_read_word
*
* Description:
* Read 16-bit register
*
****************************************************************************/
static int mlx90614_read_word(FAR struct mlx90614_dev_s *priv, uint8_t cmd,
FAR uint16_t *regval)
{
struct i2c_config_s config;
#ifdef CONFIG_MLX90614_CRC
uint8_t checkcrc[6];
uint8_t *buffer;
#else
uint8_t buffer[3];
#endif
uint8_t crc;
int ret;
#ifdef CONFIG_MLX90614_CRC
/* Recreate the I2C byte sequence to check the CRC PEC field */
checkcrc[0] = I2C_WRITEADDR8(priv->addr);
checkcrc[1] = cmd;
checkcrc[2] = I2C_READADDR8(priv->addr);
/* Point "buffer" to checkcrc[3] to fill it with received bytes */
buffer = (uint8_t *) &checkcrc[3];
#endif
/* Set up the I2C configuration */
config.frequency = 100000;
config.address = priv->addr;
config.addrlen = 7;
/* Write the Command and read 16-bits + PEC from the device */
ret = i2c_writeread(priv->i2c, &config, (FAR const uint8_t *) &cmd, 1,
buffer, 3);
if (ret < 0)
{
snerr ("i2c_writeread failed: %d\n", ret);
return ret;
}
/* Copy the content of the buffer to the location of the uint16_t pointer */
*regval = (uint16_t)(buffer[0] | (buffer[1] << 8));
sninfo("value[0]: %02x | value[1]: %02x | value[2]: %02x | ret: %d\n",
buffer[0], buffer[1], buffer[2], ret);
#ifdef CONFIG_MLX90614_CRC
crc = crc8ccitt(checkcrc, 5);
sninfo("Calculated CRC: 0x%02X\n", crc);
if (crc != buffer[2])
{
snerr("Invalid CRC! Expected: 0x%02X read: 0x%02X\n", crc, buffer[2]);
return -EFAULT;
}
#endif
return OK;
}
/****************************************************************************
* Name: mlx90614_write_word
*
* Description:
* Write to a 16-bit register
*
****************************************************************************/
static int mlx90614_write_word(FAR struct mlx90614_dev_s *priv, uint8_t cmd,
uint16_t regval)
{
struct i2c_config_s config;
uint8_t pkgcrc[5];
uint8_t crc;
int ret;
/* Set up the I2C configuration */
config.frequency = 100000;
config.address = priv->addr;
config.addrlen = 7;
/* First write 0x00 0x00 to erase the EEPROM */
pkgcrc[0] = cmd;
pkgcrc[1] = 0x00;
pkgcrc[2] = 0x00;
/* Generate the CRC to put in the PEC field */
crc = crc8ccitt(pkgcrc, 3);
sninfo("Generated CRC: 0x%02X\n", crc);
pkgcrc[3] = crc;
/* Write the Command + 2 Bytes + PEC to device */
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) pkgcrc, 4);
if (ret < 0)
{
snerr ("i2c_writeread failed: %d\n", ret);
return ret;
}
/* Wait the EEPROM erase */
nxsig_usleep(100 * 1000);
/* Create the I2C command that will be sent to device */
pkgcrc[0] = cmd;
pkgcrc[1] = (regval & 0xff);
pkgcrc[2] = (regval & 0xff00) >> 8;
/* Generate the CRC to put in the PEC field */
crc = crc8ccitt(pkgcrc, 3);
sninfo("Generated CRC: 0x%02X\n", crc);
pkgcrc[3] = crc;
/* Write the Command + 2 Bytes + PEC to device */
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) pkgcrc, 4);
if (ret < 0)
{
snerr ("i2c_writeread failed: %d\n", ret);
return ret;
}
return OK;
}
/****************************************************************************
* Name: mlx90614_open
*
* Description:
* This function is called whenever the MLX90614 device is opened.
*
****************************************************************************/
static int mlx90614_open(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: mlx90614_close
*
* Description:
* This routine is called when the MLX90614 device is closed.
*
****************************************************************************/
static int mlx90614_close(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: mlx90614_read
****************************************************************************/
static ssize_t mlx90614_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode;
FAR struct mlx90614_dev_s *priv;
FAR struct mlx90614_temp_s *temp = (FAR struct mlx90614_temp_s *)buffer;
uint8_t cmd;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct mlx90614_dev_s *)inode->i_private;
/* Check if the user is reading the right size */
if (buflen != sizeof(struct mlx90614_temp_s))
{
snerr("ERROR: You need to read 2 bytes from this sensor!\n");
return -EINVAL;
}
/* Read Ambient Temperature sensor */
cmd = MLX90614_CMD_RAM_ACCESS | MLX90614_TA;
ret = mlx90614_read_word(priv, cmd, &(temp->ta));
if (ret < 0)
{
snerr("ERROR: Error reading thermometer sensor!\n");
return ret;
}
/* Read Object1 Temperature sensor */
cmd = MLX90614_CMD_RAM_ACCESS | MLX90614_TOBJ1;
ret = mlx90614_read_word(priv, cmd, &(temp->tobj1));
if (ret < 0)
{
snerr("ERROR: Error reading thermometer sensor!\n");
return ret;
}
/* Read Object2 Temperature sensor - some sensor doesn't have it */
cmd = MLX90614_CMD_RAM_ACCESS | MLX90614_TOBJ2;
ret = mlx90614_read_word(priv, cmd, &(temp->tobj2));
if (ret < 0)
{
snerr("ERROR: Error reading thermometer sensor!\n");
return ret;
}
return buflen;
}
/****************************************************************************
* Name: mlx90614_write
****************************************************************************/
static ssize_t mlx90614_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen)
{
return -ENOSYS;
}
/****************************************************************************
* Name: mlx90614_ioctl
****************************************************************************/
static int mlx90614_ioctl(FAR struct file *filep, int cmd,
unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct mlx90614_dev_s *priv = inode->i_private;
int ret = OK;
switch (cmd)
{
/* Change the device to use a new i2c/smbus address */
case SNIOC_CHANGE_SMBUSADDR:
{
FAR uint8_t *ptr = (FAR uint8_t *)((uintptr_t)arg);
uint16_t newaddr;
uint8_t smbcmd;
/* The I2C address is put in the high byte position */
newaddr = (uint16_t) (*ptr << 8);
snerr("Setting new address: 0x%02x\n", newaddr);
smbcmd = MLX90614_CMD_EEPROM_ACCESS | MLX90614_SMBUS_ADDR;
ret = mlx90614_write_word(priv, smbcmd, newaddr);
if (ret < 0)
{
snerr("ERROR: Failed to change the I2C/SMBus address!\n");
}
}
break;
default:
snerr("ERROR: Unrecognized cmd: %d\n", cmd);
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mlx90614_register
*
* Description:
* Register the MLX90614 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/therm0"
* i2c - An instance of the I2C interface to use to communicate with
* MLX90614
* addr - The I2C address of the MLX90614.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int mlx90614_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
uint8_t addr)
{
int ret;
/* Sanity check */
DEBUGASSERT(i2c != NULL);
/* Initialize the MLX90614 device structure */
FAR struct mlx90614_dev_s *priv =
(FAR struct mlx90614_dev_s *)kmm_malloc(sizeof(struct mlx90614_dev_s));
if (priv == NULL)
{
snerr("ERROR: Failed to allocate instance\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->addr = addr;
/* Register the character driver */
ret = register_driver(devpath, &g_mlx90614_fops, 0666, priv);
if (ret < 0)
{
snerr("ERROR: Failed to register driver: %d\n", ret);
kmm_free(priv);
}
return ret;
}
#endif /* CONFIG_I2C && CONFIG_SENSORS_MLX90614 */

4
include/nuttx/sensors/ioctl.h
View File

@ -174,4 +174,8 @@
#define SNIOC_LSM303AGRSENSORREAD _SNIOC(0x0051) /* Arg: file *filep, FAR char *buffer,size_t buflen */ #define SNIOC_LSM303AGRSENSORREAD _SNIOC(0x0051) /* Arg: file *filep, FAR char *buffer,size_t buflen */
#define SNIOC_START_SELFTEST _SNIOC(0x0052) /* Arg: file *filep, FAR char *buffer,size_t mode */ #define SNIOC_START_SELFTEST _SNIOC(0x0052) /* Arg: file *filep, FAR char *buffer,size_t mode */
/* IOCTL commands unique to the MLX90614 */
#define SNIOC_CHANGE_SMBUSADDR _SNIOC(0x0053) /* Arg: uint8_t value */
#endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */ #endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */

188
include/nuttx/sensors/mlx90614.h Normal file
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@ -0,0 +1,188 @@
/****************************************************************************
* include/nuttx/sensors/mlx90614.h
*
* Copyright (C) 2018 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_SENSORS_MLX90614_H
#define __INCLUDE_NUTTX_SENSORS_MLX90614_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/irq.h>
#include <nuttx/config.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/spi/spi.h>
#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_MLX90614)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* MLX90614 Commands */
#define MLX90614_CMD_RAM_ACCESS (0x00) /* RAM Access Command */
#define MLX90614_CMD_EEPROM_ACCESS (0x20) /* EEPROM Access Command */
#define MLX90614_CMD_READ_FLAGS (0xf0) /* Read Flags Command */
#define MLX90614_CMD_ENTER_SLEEP (0xff) /* Enter Sleep Mode Command */
/* MLX90614 EEPROM Addresses ************************************************/
#define MLX90614_TO_MAX (0x00) /* To_max = Max Temperature of the Object */
#define MLX90614_TO_MIN (0x01) /* To_min = Min Temperature of the Object */
#define MLX90614_PWMCTRL (0x02) /* PWM Control */
#define MLX90614_TA_RANGE (0x03) /* Range of Ambient Temperature */
#define MLX90614_KE (0x04) /* Ke */
#define MLX90614_CONFIG_REG1 (0x05) /* Config Register1 */
/* 0x06-0x0D - Reserved */
#define MLX90614_SMBUS_ADDR (0x0e) /* SMBus address */
/* 0x0f-0x1b - Reserved */
#define MLX90614_ID_NUM1 (0x1c) /* ID number */
#define MLX90614_ID_NUM2 (0x1d) /* ID number */
#define MLX90614_ID_NUM3 (0x1e) /* ID number */
#define MLX90614_ID_NUM4 (0x1f) /* ID number */
/* Register bits definitions */
/* PWMCTRL */
#define PWMCTRL_MODE_SINGLE (1 << 0) /* Single PWM, 0 = Extended PWM */
#define PWMCTRL_PWM_ENABLE (1 << 1) /* Enable PWM/disable SMBus, 0 = Disable PWM/enable SMBus */
#define PWMCTRL_PWM_PUSHPULL (1 << 2) /* Push-Pull mode, 0 = OpenDrain */
#define PWMCTRL_THERMORELAY (1 << 3) /* ThermoRelay mode, 0 = PWM mode */
#define PWMCTRL_EXT_PWM_SHIFT (4) /* Number of repetitions */
#define PWMCTRL_EXT_PWM_MASK (0x1f << PWMCTRL_EXT_PWM_SHIFT)
#define PWMCTRL_EXT_PWM_REP(n) (n << PWMCTRL_EXT_PWM_SHIFT)
#define PWMCTRL_PWM_CLK_CFG_SHIFT (9) /* PWM clock configuration */
#define PWMCTRL_PWM_CLK_CFG_MASK (0x7f << PWMCTRL_PWM_CLK_CFG_SHIFT)
#define PWMCTRL_PWM_CLK_CFG_DIV(n) (n << PWMCTRL_PWM_CLK_CFG_SHIFT)
/* CONFIG_REG1 */
#define CONFIG_REG1_IIR_SHIFT (0) /* Bits 2:0 - Configure IIR Coeficients */
#define CONFIG_REG1_IIR_MASK (7 << CONFIG_REG1_IIR_SHIFT)
#define CONFIG_REG1_IIR_0p5_0p5 (0 << CONFIG_REG1_IIR_SHIFT) /* a1 = 0.5 and b1 = 0.5 */
#define CONFIG_REG1_IIR_0p57_0p42 (7 << CONFIG_REG1_IIR_SHIFT) /* a1 = 0.571428571 and b1 = 0.428571428 */
#define CONFIG_REG1_IIR_0p66_0p33 (6 << CONFIG_REG1_IIR_SHIFT) /* a1 = 0.666... and b1 = 0.333... */
#define CONFIG_REG1_IIR_0p8_0p2 (5 << CONFIG_REG1_IIR_SHIFT) /* a1 = 0.8 and b1 = 0.2 */
#define CONFIG_REG1_IIR_BYPASS (4 << CONFIG_REG1_IIR_SHIFT) /* a1 = 1 and b1 = 0 => IIR bypassed */
#define CONFIG_REG1_AMB_SENSOR_PTC (1 << 3) /* Ambient temperature sensor: 1 = PTC, 0 = PTAT */
#define CONFIG_REG1_DATA_PWM_SHIFT (4) /* Bits 5:4 - Data transmitted through PWM */
#define CONFIG_REG1_DATA_PWM_MASK (3 << CONFIG_REG1_DATA_PWM_SHIFT)
#define CONFIG_REG1_DATA_PWM_TA_IR1 (0 << CONFIG_REG1_DATA_PWM_SHIFT) /* Data1 = Ta and Data2 = IR1 */
#define CONFIG_REG1_DATA_PWM_TA_IR2 (1 << CONFIG_REG1_DATA_PWM_SHIFT) /* Data1 = Ta and Data2 = IR2 */
#define CONFIG_REG1_DATA_PWM_IR1_IR2 (2 << CONFIG_REG1_DATA_PWM_SHIFT) /* Data1 = IR1 and Data2 = IR2 */
#define CONFIG_REG1_DATA_PWM_IR1_UND (3 << CONFIG_REG1_DATA_PWM_SHIFT) /* Data1 = IR2 and Data2 = Undefined */
#define CONFIG_REG1_NUM_SENSORS (1 << 6) /* Number of sensors: 1 = 2 sensors, 0 = 1 sensor */
#define CONFIG_REG1_KS (1 << 7) /* Define the sign Ks. Factory calibration, do not alter */
#define CONFIG_REG1_FIR_SHIFT (8) /* Bits 10:8 - Configure coefficient N of FIR digital filter */
#define CONFIG_REG1_FIR_MASK (7 << CONFIG_REG1_FIR_SHIFT)
#define CONFIG_REG1_FIR_N(n) (((n >> 3) - 1) << CONFIG_REG1_FIR_SHIFT) /* n = 8, 16, 32, 64 ... 1024 */
#define CONFIG_REG1_AMP_GAIN_SHIFT (11) /* Bits 13:11 - Configure the gain of amplifier */
#define CONFIG_REG1_AMP_GAIN_MASK (7 << CONFIG_REG1_AMP_GAIN_SHIFT)
#define CONFIG_REG1_AMP_GAIN_1 (0 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 1 => preamplifier bypassed */
#define CONFIG_REG1_AMP_GAIN_3 (1 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 3 */
#define CONFIG_REG1_AMP_GAIN_6 (2 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 6 */
#define CONFIG_REG1_AMP_GAIN_12p5 (3 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 12.5 */
#define CONFIG_REG1_AMP_GAIN_25 (4 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 25 */
#define CONFIG_REG1_AMP_GAIN_50 (5 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 50 */
#define CONFIG_REG1_AMP_GAIN_100 (6 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 100 */
#define CONFIG_REG1_AMP_GAIN_200 (7 << CONFIG_REG1_AMP_GAIN_SHIFT) /* Gain = 200 */
#define CONFIG_REG1_THERMOSHOCK_NEG (1 << 15) /* Define the sign of thermosock: 1 - negative, 0 - positive */
/* MLX90614 RAM Register ****************************************************/
#define MLX90614_TA (0x06) /* Ta = Temperature Ambient */
#define MLX90614_TOBJ1 (0x07) /* Tobj1 = Temperature Object 1 */
#define MLX90614_TOBJ2 (0x08) /* Tobj2 = Temperature Object 2 */
/* MLX90614 Read Flags */
#define MLX90614_EEBUSY (1 << 15) /* Previos write/erase EEPROM access is still in progress */
#define MLX90614_EEDEAD (1 << 13) /* EEPROM double error has occurred */
#define MLX90614_INIT (1 << 12) /* POR initialization routine is still ongoing */
/****************************************************************************
* Public Types
****************************************************************************/
struct mlx90614_temp_s
{
uint16_t ta;
uint16_t tobj1;
uint16_t tobj2;
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: mlx90614_register
*
* Description:
* Register the MLX90614 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/mag0"
* i2c - An instance of the I2C interface to use to communicate with
* MLX90614
* addr - The I2C address used by the MLX90614.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int mlx90614_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
uint8_t addr);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_I2C && CONFIG_SENSORS_MLX90614 */
#endif /* __INCLUDE_NUTTX_SENSORS_MLX90614_H */