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Merged in paulpatience/nuttx (pull request #11)

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Added LM92 temperature sensor.
This commit is contained in:
Gregory Nutt 2015-08-06 16:26:26 -06:00
commit 41a09a6d64
4 changed files with 783 additions and 0 deletions
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7
drivers/sensors/Kconfig
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@ -79,6 +79,13 @@ config LM75
This should also work with compatible temperature sensors such as
the TI TMP100/101.
config LM92
bool "TI LM92 Temperature Sensor support"
default n
select I2C
---help---
Enable driver support for the TI LM92 Temperature Sensor.
config QENCODER
bool "Qencoder"
default n

4
drivers/sensors/Make.defs
View File

@ -60,6 +60,10 @@ endif
ifeq ($(CONFIG_I2C_LM75),y)
CSRCS += lm75.c
endif
ifeq ($(CONFIG_LM92),y)
CSRCS += lm92.c
endif
endif # CONFIG_I2C
# These drivers depend on SPI support

622
drivers/sensors/lm92.c Normal file
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@ -0,0 +1,622 @@
/****************************************************************************
* drivers/sensors/lm92.c
* Character driver for the TI LM92 Temperature Sensor
*
* Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2015 Alexandru Duru. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Alexandru Duru <alexandruduru@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 <stdlib.h>
#include <fixedmath.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c.h>
#include <nuttx/sensors/lm92.h>
#if defined(CONFIG_I2C) && defined(CONFIG_LM92)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Centigrade to Fahrenheit conversion: F = 9*C/5 + 32 */
#define B16_9DIV5 (9 * 65536 / 5)
#define B16_32 (32 * 65536)
/****************************************************************************
* Private
****************************************************************************/
struct lm92_dev_s
{
FAR struct i2c_dev_s *i2c; /* I2C interface */
uint8_t addr; /* I2C address */
bool fahrenheit; /* true: temperature will be reported in Fahrenheit */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* I2C Helpers */
static int lm92_readb16(FAR struct lm92_dev_s *priv, uint8_t regaddr,
FAR b16_t *regvalue);
static int lm92_writeb16(FAR struct lm92_dev_s *priv, uint8_t regaddr,
b16_t regval);
static int lm92_readtemp(FAR struct lm92_dev_s *priv, FAR b16_t *temp);
static int lm92_readconf(FAR struct lm92_dev_s *priv, FAR uint8_t *conf);
static int lm92_writeconf(FAR struct lm92_dev_s *priv, uint8_t conf);
/* Character driver methods */
static int lm92_open(FAR struct file *filep);
static int lm92_close(FAR struct file *filep);
static ssize_t lm92_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t lm92_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static int lm92_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_lm92fops =
{
lm92_open,
lm92_close,
lm92_read,
lm92_write,
0,
lm92_ioctl
#ifndef CONFIG_DISABLE_POLL
, 0
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lm92_readb16
*
* Description:
* Read a 16-bit register (LM92_TEMP_REG, LM92_THYS_REG, LM92_TCRIT_REG,
* LM92_TLOW_REG, LM92_THIGH_REG, or LM92_ID_REG)
*
****************************************************************************/
static int lm92_readb16(FAR struct lm92_dev_s *priv, uint8_t regaddr,
FAR b16_t *regvalue)
{
uint8_t buffer[2];
int ret;
/* Write the register address */
I2C_SETADDRESS(priv->i2c, priv->addr, 7);
ret = I2C_WRITE(priv->i2c, &regaddr, 1);
if (ret < 0)
{
sndbg("I2C_WRITE failed: %d\n", ret);
return ret;
}
/* Restart and read 16 bits from the register (discarding 3) */
ret = I2C_READ(priv->i2c, buffer, 2);
if (ret < 0)
{
sndbg("I2C_READ failed: %d\n", ret);
return ret;
}
/* Data format is: TTTTTTTT TTTTTxxx where TTTTTTTTTTTTT is a thirteen-bit,
* signed temperature value with LSB = 0.0625 degrees Centigrade.
*/
*regvalue = (b16_t)((uint32_t)(buffer[0] & (1 << 7)) << 24 |
(uint32_t)(buffer[0] & ~(1 << 7)) << 17 |
(uint32_t)(buffer[1] & ~7) << 9);
sndbg("addr: %02x value: %08x ret: %d\n", regaddr, *regvalue, ret);
return OK;
}
/****************************************************************************
* Name: lm92_writeb16
*
* Description:
* Write to a 16-bit register (LM92_TEMP_REG, LM92_THYS_REG, LM92_TCRIT_REG,
* LM92_TLOW_REG, LM92_THIGH_REG, or LM92_ID_REG)
*
****************************************************************************/
static int lm92_writeb16(FAR struct lm92_dev_s *priv, uint8_t regaddr,
b16_t regval)
{
uint8_t buffer[3];
sndbg("addr: %02x value: %08x\n", regaddr, regval);
/* Set up a 3-byte message to send */
buffer[0] = regaddr;
buffer[1] = (uint8_t)(((uint32_t)regval & (1 << 31)) >> 24 |
((uint32_t)regval & ~(1 << 31)) >> 17);
buffer[2] = (uint8_t)(((uint32_t)regval & ~(1 << 31)) >> 9);
/* Write the register address followed by the data (no RESTART) */
I2C_SETADDRESS(priv->i2c, priv->addr, 7);
return I2C_WRITE(priv->i2c, buffer, 3);
}
/****************************************************************************
* Name: lm92_readtemp
*
* Description:
* Read the temperature register with special scaling (LM92_TEMP_REG)
*
****************************************************************************/
static int lm92_readtemp(FAR struct lm92_dev_s *priv, FAR b16_t *temp)
{
b16_t temp16;
int ret;
/* Read the raw temperature data (b16_t) */
ret = lm92_readb16(priv, LM92_TEMP_REG, &temp16);
if (ret < 0)
{
sndbg("lm92_readb16 failed: %d\n", ret);
return ret;
}
sndbg("Centigrade: %08x\n", temp16);
/* Was Fahrenheit requested? */
if (priv->fahrenheit)
{
/* Centigrade to Fahrenheit conversion: F = 9*C/5 + 32 */
temp16 = b16mulb16(temp16, B16_9DIV5) + B16_32;
sndbg("Fahrenheit: %08x\n", temp16);
}
*temp = temp16;
return OK;
}
/****************************************************************************
* Name: lm92_readconf
*
* Description:
* Read the 8-bit LM92 configuration register
*
****************************************************************************/
static int lm92_readconf(FAR struct lm92_dev_s *priv, FAR uint8_t *conf)
{
uint8_t buffer;
int ret;
/* Write the configuration register address */
I2C_SETADDRESS(priv->i2c, priv->addr, 7);
buffer = LM92_CONF_REG;
ret = I2C_WRITE(priv->i2c, &buffer, 1);
if (ret < 0)
{
sndbg("I2C_WRITE failed: %d\n", ret);
return ret;
}
/* Restart and read 8 bits from the register */
ret = I2C_READ(priv->i2c, conf, 1);
sndbg("conf: %02x ret: %d\n", *conf, ret);
return ret;
}
/****************************************************************************
* Name: lm92_writeconf
*
* Description:
* Write to a 8-bit LM92 configuration register.
*
****************************************************************************/
static int lm92_writeconf(FAR struct lm92_dev_s *priv, uint8_t conf)
{
uint8_t buffer[2];
sndbg("conf: %02x\n", conf);
/* Set up a 2-byte message to send */
buffer[0] = LM92_CONF_REG;
buffer[1] = conf;
/* Write the register address followed by the data (no RESTART) */
I2C_SETADDRESS(priv->i2c, priv->addr, 7);
return I2C_WRITE(priv->i2c, buffer, 2);
}
/****************************************************************************
* Name: lm92_readid
*
* Description:
* Read the 16-bit LM92 identification register
*
****************************************************************************/
static int lm92_readid(FAR struct lm92_dev_s *priv, FAR uint16_t *id)
{
uint8_t buffer[2];
uint8_t regaddr;
int ret;
/* Write the identification register address */
I2C_SETADDRESS(priv->i2c, priv->addr, 7);
regaddr = LM92_ID_REG;
ret = I2C_WRITE(priv->i2c, &regaddr, 1);
if (ret < 0)
{
sndbg("I2C_WRITE failed: %d\n", ret);
return ret;
}
/* Restart and read 16 bits from the register */
ret = I2C_READ(priv->i2c, buffer, 2);
if (ret < 0)
{
sndbg("I2C_READ failed: %d\n", ret);
return ret;
}
*id = (uint16_t)buffer[0] << 8 | (uint16_t)buffer[1];
sndbg("id: %04x ret: %d\n", *id, ret);
return OK;
}
/****************************************************************************
* Name: lm92_open
*
* Description:
* This function is called whenever the LM92 device is opened.
*
****************************************************************************/
static int lm92_open(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: lm92_close
*
* Description:
* This function is called whenever the LM92 device is closed.
*
****************************************************************************/
static int lm92_close(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: lm92_read
****************************************************************************/
static ssize_t lm92_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct lm92_dev_s *priv = inode->i_private;
FAR b16_t *ptr;
ssize_t nsamples;
int i;
int ret;
/* How many samples were requested to get? */
nsamples = buflen / sizeof(b16_t);
ptr = (FAR b16_t *)buffer;
sndbg("buflen: %d nsamples: %d\n", buflen, nsamples);
/* Get the requested number of samples */
for (i = 0; i < nsamples; i++)
{
b16_t temp = 0;
/* Read the next b16_t temperature value */
ret = lm92_readtemp(priv, &temp);
if (ret < 0)
{
sndbg("lm92_readtemp failed: %d\n",ret);
return (ssize_t)ret;
}
/* Save the temperature value in the user buffer */
*ptr++ = temp;
}
return nsamples * sizeof(b16_t);
}
/****************************************************************************
* Name: lm92_write
****************************************************************************/
static ssize_t lm92_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
return -ENOSYS;
}
/****************************************************************************
* Name: lm92_ioctl
****************************************************************************/
static int lm92_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct lm92_dev_s *priv = inode->i_private;
int ret = OK;
switch (cmd)
{
/* Read from the configuration register. Arg: uint8_t* pointer */
case SNIOC_READCONF:
{
FAR uint8_t *ptr = (FAR uint8_t *)((uintptr_t)arg);
ret = lm92_readconf(priv, ptr);
sndbg("conf: %02x ret: %d\n", *ptr, ret);
}
break;
/* Write to the configuration register. Arg: uint8_t value */
case SNIOC_WRITECONF:
ret = lm92_writeconf(priv, (uint8_t)arg);
sndbg("conf: %02x ret: %d\n", *(uint8_t *)arg, ret);
break;
/* Shutdown the LM92. Arg: None */
case SNIOC_SHUTDOWN:
{
uint8_t conf;
ret = lm92_readconf(priv, &conf);
if (ret == OK)
{
ret = lm92_writeconf(priv, conf | LM92_CONF_SHUTDOWN);
}
sndbg("conf: %02x ret: %d\n", conf | LM92_CONF_SHUTDOWN, ret);
}
break;
/* Powerup the LM92. Arg: None */
case SNIOC_POWERUP:
{
uint8_t conf;
ret = lm92_readconf(priv, &conf);
if (ret == OK)
{
ret = lm92_writeconf(priv, conf & ~LM92_CONF_SHUTDOWN);
}
sndbg("conf: %02x ret: %d\n", conf & ~LM92_CONF_SHUTDOWN, ret);
}
break;
/* Report samples in Fahrenheit. Arg: None */
case SNIOC_FAHRENHEIT:
priv->fahrenheit = true;
sndbg("Fahrenheit\n");
break;
/* Report samples in Centigrade. Arg: None */
case SNIOC_CENTIGRADE:
priv->fahrenheit = false;
sndbg("Centigrade\n");
break;
/* Read THYS temperature register. Arg: b16_t* pointer */
case SNIOC_READTHYS:
{
FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
ret = lm92_readb16(priv, LM92_THYS_REG, ptr);
sndbg("THYS: %08x ret: %d\n", *ptr, ret);
}
break;
/* Write THYS temperature register. Arg: b16_t value */
case SNIOC_WRITETHYS:
ret = lm92_writeb16(priv, LM92_THYS_REG, (b16_t)arg);
sndbg("THYS: %08x ret: %d\n", (b16_t)arg, ret);
break;
/* Read TCRIT temperature register. Arg: b16_t* pointer */
case SNIOC_READTCRIT:
{
FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
ret = lm92_readb16(priv, LM92_TCRIT_REG, ptr);
sndbg("TCRIT: %08x ret: %d\n", *ptr, ret);
}
break;
/* Write TCRIT temperature register. Arg: b16_t value */
case SNIOC_WRITETCRIT:
ret = lm92_writeb16(priv, LM92_TCRIT_REG, (b16_t)arg);
sndbg("TCRIT: %08x ret: %d\n", (b16_t)arg, ret);
break;
/* Read TLOW temperature register. Arg: b16_t* pointer */
case SNIOC_READTLOW:
{
FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
ret = lm92_readb16(priv, LM92_TLOW_REG, ptr);
sndbg("TLOW: %08x ret: %d\n", *ptr, ret);
}
break;
/* Write TLOW temperature register. Arg: b16_t value */
case SNIOC_WRITETLOW:
ret = lm92_writeb16(priv, LM92_TLOW_REG, (b16_t)arg);
sndbg("TLOW: %08x ret: %d\n", (b16_t)arg, ret);
break;
/* Read THIGH temperature register. Arg: b16_t* pointer */
case SNIOC_READTHIGH:
{
FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg);
ret = lm92_readb16(priv, LM92_THIGH_REG, ptr);
sndbg("THIGH: %08x ret: %d\n", *ptr, ret);
}
break;
/* Write THIGH temperature register. Arg: b16_t value */
case SNIOC_WRITETHIGH:
ret = lm92_writeb16(priv, LM92_THIGH_REG, (b16_t)arg);
sndbg("THIGH: %08x ret: %d\n", (b16_t)arg, ret);
break;
/* Read from the identification register. Arg: uint16_t* pointer */
case SNIOC_READID:
{
FAR uint16_t *ptr = (FAR uint16_t *)((uintptr_t)arg);
ret = lm92_readid(priv, ptr);
sndbg("id: %04x ret: %d\n", *ptr, ret);
}
break;
default:
sndbg("Unrecognized cmd: %d\n", cmd);
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lm92_register
*
* Description:
* Register the LM92 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/temp0".
* i2c - An instance of the I2C interface to use to communicate
* with the LM92.
* addr - The I2C address of the LM92. The base I2C address of the LM92
* is 0x48. Bits 0-2 can be controlled to get 4 unique addresses
* from 0x48 through 0x4b.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int lm92_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c,
uint8_t addr)
{
FAR struct lm92_dev_s *priv;
int ret;
/* Initialize the LM92 device structure */
priv = (FAR struct lm92_dev_s *)kmm_malloc(sizeof(struct lm92_dev_s));
if (!priv)
{
sndbg("Failed to allocate instance\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->addr = addr;
priv->fahrenheit = false;
/* Register the character driver */
ret = register_driver(devpath, &g_lm92fops, 0666, priv);
if (ret < 0)
{
sndbg("Failed to register driver: %d\n", ret);
kmm_free(priv);
}
return ret;
}
#endif /* CONFIG_I2C && CONFIG_LM92 */

150
include/nuttx/sensors/lm92.h Normal file
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@ -0,0 +1,150 @@
/****************************************************************************
* include/nuttx/sensors/lm92.h
*
* Copyright (C) 2011-2012, 2015 Gregory Nutt. All rights reserved.
* Copyright (C) 2015 Alexandru Duru. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Alexandru Duru <alexandruduru@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_LM92_H
#define __INCLUDE_NUTTX_SENSORS_LM92_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/fs/ioctl.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************
* CONFIG_I2C - Enables support for I2C drivers
* CONFIG_LM92 - Enables support for the LM92 driver
*/
#define CONFIG_LM92_BASEADDR 0x48
#define CONFIG_LM92_ADDR0 (CONFIG_LM92_BASEADDR + 0)
#define CONFIG_LM92_ADDR1 (CONFIG_LM92_BASEADDR + 1)
#define CONFIG_LM92_ADDR2 (CONFIG_LM92_BASEADDR + 2)
#define CONFIG_LM92_ADDR3 (CONFIG_LM92_BASEADDR + 3)
/* IOCTL Commands ***********************************************************/
#define SNIOC_READCONF _SNIOC(0x0001) /* Arg: uint8_t* pointer */
#define SNIOC_WRITECONF _SNIOC(0x0002) /* Arg: uint8_t value */
#define SNIOC_SHUTDOWN _SNIOC(0x0003) /* Arg: None */
#define SNIOC_POWERUP _SNIOC(0x0004) /* Arg: None */
#define SNIOC_FAHRENHEIT _SNIOC(0x0005) /* Arg: None */
#define SNIOC_CENTIGRADE _SNIOC(0x0006) /* Arg: None */
#define SNIOC_READTHYS _SNIOC(0x0007) /* Arg: b16_t* pointer */
#define SNIOC_WRITETHYS _SNIOC(0x0008) /* Arg: b16_t value */
#define SNIOC_READTCRIT _SNIOC(0x0009) /* Arg: b16_t* pointer */
#define SNIOC_WRITETCRIT _SNIOC(0x000a) /* Arg: b16_t value */
#define SNIOC_READTLOW _SNIOC(0x000b) /* Arg: b16_t* pointer */
#define SNIOC_WRITETLOW _SNIOC(0x000c) /* Arg: b16_t value */
#define SNIOC_READTHIGH _SNIOC(0x000d) /* Arg: b16_t* pointer */
#define SNIOC_WRITETHIGH _SNIOC(0x000e) /* Arg: b16_t value */
#define SNIOC_READID _SNIOC(0x000f) /* Arg: uint16_t* pointer */
/* LM92 Register Definitions ***********************************************/
/* LM92 Register Addresses */
#define LM92_TEMP_REG 0x00 /* Temperature Register */
#define LM92_CONF_REG 0x01 /* Configuration Register */
#define LM92_THYS_REG 0x02 /* Temperature Register */
#define LM92_TCRIT_REG 0x03 /* Critical Temperature Register */
#define LM92_TLOW_REG 0x04 /* Low Temperature Register */
#define LM92_THIGH_REG 0x05 /* High Temperature Register */
#define LM92_ID_REG 0x07 /* Manufacturer's Identification Register */
/* Configuration Register Bit Definitions */
#define LM92_CONF_SHUTDOWN (1 << 0) /* Bit 0: Put LM92 goes in low power shutdown mode */
#define LM92_CONF_INTMODE (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */
#define LM92_CONF_TCRITPOLARITY (1 << 2) /* Bit 2: 0=Active low 1=Active high */
#define LM92_CONF_INTPOLARITY (1 << 3) /* Bit 3: 0=Active low 1=Active high */
#define LM92_CONF_FAULTQ (1 << 4) /* Bit 4: 0=Disabled 1=Enabled */
/* NOTE: When temperature values are read, they are returned as b16_t, fixed
* precision integer values (see include/fixedmath.h).
*/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: lm92_register
*
* Description:
* Register the LM92 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/temp0".
* i2c - An instance of the I2C interface to use to communicate
* with the LM92.
* addr - The I2C address of the LM92. The base I2C address of the LM92
* is 0x48. Bits 0-2 can be controlled to get 4 unique addresses
* from 0x48 through 0x4b.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int lm92_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c,
uint8_t addr);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __INCLUDE_NUTTX_SENSORS_LM92_H */