Merged in ordsen/nuttx/feature-ltc4151-driver (pull request #445)
Add driver for LTC4151 current and voltage monitor Approved-by: Gregory Nutt <gnutt@nuttx.org>
This commit is contained in:
Giorgio Groß
Gregory Nutt
commit
cf5440d60c
@ -167,6 +167,13 @@ config DEBUG_LPS25H
|
|||||||
|
|
||||||
endif # LPS25H
|
endif # LPS25H
|
||||||
|
|
||||||
|
config LTC4151
|
||||||
|
bool "LTC4151 current and voltage monitor"
|
||||||
|
default n
|
||||||
|
select I2C
|
||||||
|
---help---
|
||||||
|
Enable driver support for the LinearTechnology LTC4151 current and voltage monitor.
|
||||||
|
|
||||||
config MB7040
|
config MB7040
|
||||||
bool "MaxBotix MB7040 Sonar support"
|
bool "MaxBotix MB7040 Sonar support"
|
||||||
default n
|
default n
|
||||||
|
|||||||
@ -113,6 +113,10 @@ ifeq ($(CONFIG_MS58XX),y)
|
|||||||
CSRCS += ms58xx.c
|
CSRCS += ms58xx.c
|
||||||
endif
|
endif
|
||||||
|
|
||||||
|
ifeq ($(CONFIG_LTC4151),y)
|
||||||
|
CSRCS += ltc4151.c
|
||||||
|
endif
|
||||||
|
|
||||||
endif # CONFIG_I2C
|
endif # CONFIG_I2C
|
||||||
|
|
||||||
# These drivers depend on SPI support
|
# These drivers depend on SPI support
|
||||||
|
|||||||
332
drivers/sensors/ltc4151.c
Normal file
332
drivers/sensors/ltc4151.c
Normal file
@ -0,0 +1,332 @@
|
|||||||
|
/****************************************************************************
|
||||||
|
* drivers/sensors/ltc4151.c
|
||||||
|
* Character driver for the LTC 4151 Power Sensor
|
||||||
|
*
|
||||||
|
* Copyright (C) 2017 Giorgio Groß. All rights reserved.
|
||||||
|
* Author: Giorgio Groß <giorgio.gross@robodev.eu>
|
||||||
|
*
|
||||||
|
* 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/i2c_master.h>
|
||||||
|
#include <nuttx/sensors/ltc4151.h>
|
||||||
|
|
||||||
|
#if defined(CONFIG_I2C) && defined(CONFIG_LTC4151)
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Pre-processor Definitions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#ifndef CONFIG_LTC4151_I2C_FREQUENCY
|
||||||
|
# define CONFIG_LTC4151_I2C_FREQUENCY 400000
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
struct ltc4151_dev_s
|
||||||
|
{
|
||||||
|
FAR struct i2c_master_s *i2c; /* I2C interface */
|
||||||
|
uint8_t addr; /* I2C address */
|
||||||
|
float shunt_resistor_value; /* [ohm] */
|
||||||
|
};
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private Function Prototypes
|
||||||
|
****************************************************************************/
|
||||||
|
/* I2C Helpers */
|
||||||
|
|
||||||
|
static int ltc4151_read16(FAR struct ltc4151_dev_s *priv, uint8_t regaddr,
|
||||||
|
FAR uint16_t *regvalue);
|
||||||
|
static int ltc4151_readpower(FAR struct ltc4151_dev_s *priv, FAR ltc4151_t *buffer);
|
||||||
|
|
||||||
|
/* Character driver methods */
|
||||||
|
|
||||||
|
static int ltc4151_open(FAR struct file *filep);
|
||||||
|
static int ltc4151_close(FAR struct file *filep);
|
||||||
|
static ssize_t ltc4151_read(FAR struct file *filep, FAR char *buffer, size_t buflen);
|
||||||
|
static ssize_t ltc4151_write(FAR struct file *filep, FAR const char *buffer,
|
||||||
|
size_t buflen);
|
||||||
|
static int ltc4151_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private Data
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static const struct file_operations g_ltc4151fops =
|
||||||
|
{
|
||||||
|
ltc4151_open,
|
||||||
|
ltc4151_close,
|
||||||
|
ltc4151_read,
|
||||||
|
ltc4151_write,
|
||||||
|
NULL,
|
||||||
|
ltc4151_ioctl
|
||||||
|
#ifndef CONFIG_DISABLE_POLL
|
||||||
|
, NULL
|
||||||
|
#endif
|
||||||
|
};
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private Functions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static int ltc4151_read_reg(FAR struct ltc4151_dev_s *priv, uint8_t start_register_address, uint8_t* register_value, uint8_t data_length) {
|
||||||
|
#define I2C_NOSTARTSTOP_MSGS 2
|
||||||
|
#define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
|
||||||
|
#define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
|
||||||
|
struct i2c_msg_s msg[I2C_NOSTARTSTOP_MSGS];
|
||||||
|
|
||||||
|
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].frequency = CONFIG_LTC4151_I2C_FREQUENCY;
|
||||||
|
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr = priv->addr;
|
||||||
|
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].flags = 0;
|
||||||
|
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].buffer = &start_register_address;
|
||||||
|
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].length = 1;
|
||||||
|
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].addr = msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr;
|
||||||
|
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].flags = I2C_M_READ;
|
||||||
|
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].buffer = register_value;
|
||||||
|
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].length = data_length;
|
||||||
|
|
||||||
|
int ret = I2C_TRANSFER(priv->i2c, msg, I2C_NOSTARTSTOP_MSGS);
|
||||||
|
sninfo("start_register_address: 0x%02X data_length: %d register_value: 0x%02x (0x%04x) ret: %d\n", start_register_address, data_length, *register_value, *((uint16_t*)register_value), ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ltc4151_read16(FAR struct ltc4151_dev_s *priv, uint8_t regaddr, FAR uint16_t* regvalue)
|
||||||
|
{
|
||||||
|
int ret = ltc4151_read_reg(priv, regaddr, (uint8_t*)regvalue, sizeof(*regvalue));
|
||||||
|
*regvalue = ((*regvalue & LTC4151_VALUE_MSB_MASK) << 4) | ((*regvalue & LTC4151_VALUE_LSB_MASK) >> 8); // bytes are 8bit_msb.4bit_0.4bit_lsb = 16bit
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_readpower
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Read the current and voltage register with special scaling
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static int ltc4151_readpower(FAR struct ltc4151_dev_s *priv, FAR ltc4151_t *buffer)
|
||||||
|
{
|
||||||
|
uint16_t current_reg, volt_reg;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
/* Read the raw temperature data (b16_t) */
|
||||||
|
|
||||||
|
ret = ltc4151_read16(priv, LTC4151_CURR_REG, ¤t_reg);
|
||||||
|
if (ret < 0)
|
||||||
|
{
|
||||||
|
snerr("ERROR: ltc4151_read16 failed: %d\n", ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
ret = ltc4151_read16(priv, LTC4151_VOLT_REG, &volt_reg);
|
||||||
|
if (ret < 0)
|
||||||
|
{
|
||||||
|
snerr("ERROR: ltc4151_read16 failed: %d\n", ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
// current is passed as delta voltage, to get the current divide it by the used resistors resistance
|
||||||
|
float float_current = (((float)current_reg) * 20.0 / (1000.0 * priv->shunt_resistor_value)); // register in 20 micro volt, shunt in ohm -> result in milliampere
|
||||||
|
buffer->current = ftob16(float_current);
|
||||||
|
sninfo("current_reg=0x%04x float_current=%d\n", current_reg, (int)float_current);
|
||||||
|
|
||||||
|
float float_voltage = ((float)volt_reg) * 25.0 / 1000.0; // register in 25 micro volt -> result in volt
|
||||||
|
buffer->voltage = ftob16(float_voltage);
|
||||||
|
sninfo("volt_reg=0x%04x float_voltage=%d\n", volt_reg, (int)float_voltage);
|
||||||
|
|
||||||
|
return OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_open
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* This function is called whenever the LTC4151 device is opened.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static int ltc4151_open(FAR struct file *filep)
|
||||||
|
{
|
||||||
|
return OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_close
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* This routine is called when the LTC4151 device is closed.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static int ltc4151_close(FAR struct file *filep)
|
||||||
|
{
|
||||||
|
return OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_read
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static ssize_t ltc4151_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
|
||||||
|
{
|
||||||
|
FAR struct inode *inode = filep->f_inode;
|
||||||
|
FAR struct ltc4151_dev_s *priv = inode->i_private;
|
||||||
|
FAR struct ltc4151_t *ptr;
|
||||||
|
ssize_t nsamples;
|
||||||
|
int i;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
/* How many samples were requested to get? */
|
||||||
|
|
||||||
|
nsamples = buflen / sizeof(struct ltc4151_t);
|
||||||
|
ptr = (FAR struct ltc4151_t *)buffer;
|
||||||
|
|
||||||
|
sninfo("buflen: %d nsamples: %d\n", buflen, nsamples);
|
||||||
|
|
||||||
|
/* Get the requested number of samples */
|
||||||
|
|
||||||
|
for (i = 0; i < nsamples; i++)
|
||||||
|
{
|
||||||
|
struct ltc4151_t pwr;
|
||||||
|
|
||||||
|
/* Read the next ltc4151_t power value */
|
||||||
|
|
||||||
|
ret = ltc4151_readpower(priv, &pwr);
|
||||||
|
if (ret < 0)
|
||||||
|
{
|
||||||
|
snerr("ERROR: ltc4151_readtemp failed: %d\n", ret);
|
||||||
|
return (ssize_t)ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Save the temperature value in the user buffer */
|
||||||
|
|
||||||
|
*ptr++ = pwr;
|
||||||
|
}
|
||||||
|
|
||||||
|
return nsamples * sizeof(struct ltc4151_t);
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_write
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static ssize_t ltc4151_write(FAR struct file *filep, FAR const char *buffer,
|
||||||
|
size_t buflen)
|
||||||
|
{
|
||||||
|
return -ENOSYS;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_ioctl
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static int ltc4151_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
||||||
|
{
|
||||||
|
return -ENOTTY;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Functions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_register
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Register the LTC4151 character device as 'devpath'
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* devpath - The full path to the driver to register. E.g., "/dev/pwrmntr0"
|
||||||
|
* i2c - An instance of the I2C interface to use to communicate with LTC4151
|
||||||
|
* addr - The I2C address of the LTC4151. The base I2C address of the LTC4151
|
||||||
|
* is 0x6f. Bits 0-3 can be controlled to get 10 unique addresses from 0x66
|
||||||
|
* through 0x6f.
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Zero (OK) on success; a negated errno value on failure.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int ltc4151_register(FAR const char *devpath, FAR struct i2c_master_s *i2c, uint8_t addr, float shunt_resistor_value)
|
||||||
|
{
|
||||||
|
FAR struct ltc4151_dev_s *priv;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
/* Sanity check */
|
||||||
|
|
||||||
|
DEBUGASSERT(i2c != NULL);
|
||||||
|
DEBUGASSERT(addr == CONFIG_LTC4151_ADDR0 || addr == CONFIG_LTC4151_ADDR1 ||
|
||||||
|
addr == CONFIG_LTC4151_ADDR2 || addr == CONFIG_LTC4151_ADDR3 ||
|
||||||
|
addr == CONFIG_LTC4151_ADDR4 || addr == CONFIG_LTC4151_ADDR5 ||
|
||||||
|
addr == CONFIG_LTC4151_ADDR6 || addr == CONFIG_LTC4151_ADDR7 ||
|
||||||
|
addr == CONFIG_LTC4151_ADDR8 || addr == CONFIG_LTC4151_ADDR9);
|
||||||
|
|
||||||
|
/* Initialize the ltc4151 device structure */
|
||||||
|
|
||||||
|
priv = (FAR struct ltc4151_dev_s *)kmm_malloc(sizeof(struct ltc4151_dev_s));
|
||||||
|
if (priv == NULL)
|
||||||
|
{
|
||||||
|
snerr("ERROR: Failed to allocate instance\n");
|
||||||
|
return -ENOMEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
priv->i2c = i2c;
|
||||||
|
priv->addr = addr;
|
||||||
|
priv->shunt_resistor_value = shunt_resistor_value;
|
||||||
|
|
||||||
|
/* Register the character driver */
|
||||||
|
|
||||||
|
ret = register_driver(devpath, &g_ltc4151fops, 0666, priv);
|
||||||
|
if (ret < 0)
|
||||||
|
{
|
||||||
|
snerr("ERROR: Failed to register driver: %d\n", ret);
|
||||||
|
kmm_free(priv);
|
||||||
|
}
|
||||||
|
|
||||||
|
sninfo("ltc4151 (addr=0x%02x) registered at %s\n", priv->addr, devpath);
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
#endif /* CONFIG_I2C && CONFIG_LTC4151 */
|
||||||
129
include/nuttx/sensors/ltc4151.h
Normal file
129
include/nuttx/sensors/ltc4151.h
Normal file
@ -0,0 +1,129 @@
|
|||||||
|
/****************************************************************************
|
||||||
|
* include/nuttx/sensors/ltc4151.h
|
||||||
|
*
|
||||||
|
* Copyright (C) 2017 Giorgio Groß. All rights reserved.
|
||||||
|
* Author: Giorgio Groß <giorgio.gross@robodev.eu>
|
||||||
|
*
|
||||||
|
* 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_LTC4151_H
|
||||||
|
#define __INCLUDE_NUTTX_SENSORS_LTC4151_H
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Included Files
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#include <nuttx/config.h>
|
||||||
|
#include <nuttx/sensors/ioctl.h>
|
||||||
|
#include <fixedmath.h>
|
||||||
|
|
||||||
|
#if defined(CONFIG_I2C) && defined(CONFIG_LTC4151)
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Pre-processor Definitions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#define CONFIG_LTC4151_BASEADDR 0x66
|
||||||
|
#define CONFIG_LTC4151_ADDR0 (CONFIG_LTC4151_BASEADDR + 0)
|
||||||
|
#define CONFIG_LTC4151_ADDR1 (CONFIG_LTC4151_BASEADDR + 1)
|
||||||
|
#define CONFIG_LTC4151_ADDR2 (CONFIG_LTC4151_BASEADDR + 2)
|
||||||
|
#define CONFIG_LTC4151_ADDR3 (CONFIG_LTC4151_BASEADDR + 3)
|
||||||
|
#define CONFIG_LTC4151_ADDR4 (CONFIG_LTC4151_BASEADDR + 4)
|
||||||
|
#define CONFIG_LTC4151_ADDR5 (CONFIG_LTC4151_BASEADDR + 5)
|
||||||
|
#define CONFIG_LTC4151_ADDR6 (CONFIG_LTC4151_BASEADDR + 6)
|
||||||
|
#define CONFIG_LTC4151_ADDR7 (CONFIG_LTC4151_BASEADDR + 7)
|
||||||
|
#define CONFIG_LTC4151_ADDR8 (CONFIG_LTC4151_BASEADDR + 8)
|
||||||
|
#define CONFIG_LTC4151_ADDR9 (CONFIG_LTC4151_BASEADDR + 9)
|
||||||
|
|
||||||
|
/* LTC4151 Register Definitions ***********************************************/
|
||||||
|
/* LTC4151 Registers addresses */
|
||||||
|
|
||||||
|
#define LTC4151_CURR_REG 0x00 /* Current Register start address */
|
||||||
|
#define LTC4151_VOLT_REG 0x02 /* Voltage Register start address*/
|
||||||
|
|
||||||
|
#define LTC4151_VALUE_MSB_MASK 0x00ff
|
||||||
|
#define LTC4151_VALUE_LSB_MASK 0x0f00
|
||||||
|
|
||||||
|
/* NOTE: When meassurement values are read, they are return as b16_t, fixed
|
||||||
|
* precision integer values (see include/fixedmath.h).
|
||||||
|
*/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Types
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
struct i2c_master_s;
|
||||||
|
|
||||||
|
typedef struct ltc4151_t {
|
||||||
|
b16_t current; // [milliampere]
|
||||||
|
b16_t voltage; // [volt]
|
||||||
|
} ltc4151_t;
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Function Prototypes
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
#define EXTERN extern "C"
|
||||||
|
extern "C"
|
||||||
|
{
|
||||||
|
#else
|
||||||
|
#define EXTERN extern
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: ltc4151_register
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Register the ltc4151 character device as 'devpath'
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* devpath - The full path to the driver to register. E.g., "/dev/pwrmntr0"
|
||||||
|
* i2c - An instance of the I2C interface to use to communicate with LTC4151
|
||||||
|
* addr - The I2C address of the LTC4151. The base I2C address of the LTC4151
|
||||||
|
* is 0x18. Bits 0-3 can be controlled to get 8 unique addresses from 0x18
|
||||||
|
* through 0x1f.
|
||||||
|
* shunt_resistor_value - resistor value in ohm
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Zero (OK) on success; a negated errno value on failure.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int ltc4151_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
|
||||||
|
uint8_t addr, float shunt_resistor_value);
|
||||||
|
|
||||||
|
#undef EXTERN
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif /* CONFIG_I2C && CONFIG_LTC4151 */
|
||||||
|
#endif /* __INCLUDE_NUTTX_SENSORS_LTC4151_H */
|
||||||
Loading…
Reference in New Issue
Block a user