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
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endif # LPS25H
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config LTC4151
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bool "LTC4151 current and voltage monitor"
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default n
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select I2C
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---help---
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Enable driver support for the LinearTechnology LTC4151 current and voltage monitor.
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config MB7040
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bool "MaxBotix MB7040 Sonar support"
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default n
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@ -113,6 +113,10 @@ ifeq ($(CONFIG_MS58XX),y)
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CSRCS += ms58xx.c
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endif
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ifeq ($(CONFIG_LTC4151),y)
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CSRCS += ltc4151.c
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endif
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endif # CONFIG_I2C
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# These drivers depend on SPI support
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332
drivers/sensors/ltc4151.c
Normal file
332
drivers/sensors/ltc4151.c
Normal file
@ -0,0 +1,332 @@
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/****************************************************************************
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* drivers/sensors/ltc4151.c
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* Character driver for the LTC 4151 Power Sensor
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*
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* Copyright (C) 2017 Giorgio Groß. All rights reserved.
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* Author: Giorgio Groß <giorgio.gross@robodev.eu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <fixedmath.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/sensors/ltc4151.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_LTC4151)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_LTC4151_I2C_FREQUENCY
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# define CONFIG_LTC4151_I2C_FREQUENCY 400000
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#endif
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/****************************************************************************
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* Private
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****************************************************************************/
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struct ltc4151_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr; /* I2C address */
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float shunt_resistor_value; /* [ohm] */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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static int ltc4151_read16(FAR struct ltc4151_dev_s *priv, uint8_t regaddr,
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FAR uint16_t *regvalue);
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static int ltc4151_readpower(FAR struct ltc4151_dev_s *priv, FAR ltc4151_t *buffer);
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/* Character driver methods */
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static int ltc4151_open(FAR struct file *filep);
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static int ltc4151_close(FAR struct file *filep);
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static ssize_t ltc4151_read(FAR struct file *filep, FAR char *buffer, size_t buflen);
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static ssize_t ltc4151_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int ltc4151_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_ltc4151fops =
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{
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ltc4151_open,
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ltc4151_close,
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ltc4151_read,
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ltc4151_write,
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NULL,
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ltc4151_ioctl
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#ifndef CONFIG_DISABLE_POLL
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, NULL
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int ltc4151_read_reg(FAR struct ltc4151_dev_s *priv, uint8_t start_register_address, uint8_t* register_value, uint8_t data_length) {
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#define I2C_NOSTARTSTOP_MSGS 2
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#define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
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#define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
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struct i2c_msg_s msg[I2C_NOSTARTSTOP_MSGS];
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].frequency = CONFIG_LTC4151_I2C_FREQUENCY;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr = priv->addr;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].flags = 0;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].buffer = &start_register_address;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].length = 1;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].addr = msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].flags = I2C_M_READ;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].buffer = register_value;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].length = data_length;
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int ret = I2C_TRANSFER(priv->i2c, msg, I2C_NOSTARTSTOP_MSGS);
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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);
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return ret;
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}
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static int ltc4151_read16(FAR struct ltc4151_dev_s *priv, uint8_t regaddr, FAR uint16_t* regvalue)
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{
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int ret = ltc4151_read_reg(priv, regaddr, (uint8_t*)regvalue, sizeof(*regvalue));
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*regvalue = ((*regvalue & LTC4151_VALUE_MSB_MASK) << 4) | ((*regvalue & LTC4151_VALUE_LSB_MASK) >> 8); // bytes are 8bit_msb.4bit_0.4bit_lsb = 16bit
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return ret;
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}
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/****************************************************************************
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* Name: ltc4151_readpower
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*
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* Description:
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* Read the current and voltage register with special scaling
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*
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****************************************************************************/
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static int ltc4151_readpower(FAR struct ltc4151_dev_s *priv, FAR ltc4151_t *buffer)
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{
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uint16_t current_reg, volt_reg;
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int ret;
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/* Read the raw temperature data (b16_t) */
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ret = ltc4151_read16(priv, LTC4151_CURR_REG, ¤t_reg);
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if (ret < 0)
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{
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snerr("ERROR: ltc4151_read16 failed: %d\n", ret);
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return ret;
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}
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ret = ltc4151_read16(priv, LTC4151_VOLT_REG, &volt_reg);
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if (ret < 0)
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{
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snerr("ERROR: ltc4151_read16 failed: %d\n", ret);
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return ret;
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}
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// current is passed as delta voltage, to get the current divide it by the used resistors resistance
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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
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buffer->current = ftob16(float_current);
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sninfo("current_reg=0x%04x float_current=%d\n", current_reg, (int)float_current);
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float float_voltage = ((float)volt_reg) * 25.0 / 1000.0; // register in 25 micro volt -> result in volt
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buffer->voltage = ftob16(float_voltage);
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sninfo("volt_reg=0x%04x float_voltage=%d\n", volt_reg, (int)float_voltage);
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return OK;
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}
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/****************************************************************************
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* Name: ltc4151_open
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*
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* Description:
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* This function is called whenever the LTC4151 device is opened.
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*
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****************************************************************************/
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static int ltc4151_open(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: ltc4151_close
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*
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* Description:
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* This routine is called when the LTC4151 device is closed.
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*
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****************************************************************************/
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static int ltc4151_close(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: ltc4151_read
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****************************************************************************/
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static ssize_t ltc4151_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct ltc4151_dev_s *priv = inode->i_private;
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FAR struct ltc4151_t *ptr;
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ssize_t nsamples;
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int i;
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int ret;
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/* How many samples were requested to get? */
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nsamples = buflen / sizeof(struct ltc4151_t);
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ptr = (FAR struct ltc4151_t *)buffer;
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sninfo("buflen: %d nsamples: %d\n", buflen, nsamples);
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/* Get the requested number of samples */
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for (i = 0; i < nsamples; i++)
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{
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struct ltc4151_t pwr;
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/* Read the next ltc4151_t power value */
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ret = ltc4151_readpower(priv, &pwr);
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if (ret < 0)
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{
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snerr("ERROR: ltc4151_readtemp failed: %d\n", ret);
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return (ssize_t)ret;
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}
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/* Save the temperature value in the user buffer */
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*ptr++ = pwr;
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}
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return nsamples * sizeof(struct ltc4151_t);
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}
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/****************************************************************************
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* Name: ltc4151_write
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****************************************************************************/
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static ssize_t ltc4151_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: ltc4151_ioctl
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****************************************************************************/
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static int ltc4151_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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return -ENOTTY;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ltc4151_register
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*
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* Description:
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* Register the LTC4151 character device as 'devpath'
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/pwrmntr0"
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* i2c - An instance of the I2C interface to use to communicate with LTC4151
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* addr - The I2C address of the LTC4151. The base I2C address of the LTC4151
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* is 0x6f. Bits 0-3 can be controlled to get 10 unique addresses from 0x66
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* through 0x6f.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int ltc4151_register(FAR const char *devpath, FAR struct i2c_master_s *i2c, uint8_t addr, float shunt_resistor_value)
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{
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FAR struct ltc4151_dev_s *priv;
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int ret;
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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DEBUGASSERT(addr == CONFIG_LTC4151_ADDR0 || addr == CONFIG_LTC4151_ADDR1 ||
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addr == CONFIG_LTC4151_ADDR2 || addr == CONFIG_LTC4151_ADDR3 ||
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addr == CONFIG_LTC4151_ADDR4 || addr == CONFIG_LTC4151_ADDR5 ||
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addr == CONFIG_LTC4151_ADDR6 || addr == CONFIG_LTC4151_ADDR7 ||
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addr == CONFIG_LTC4151_ADDR8 || addr == CONFIG_LTC4151_ADDR9);
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/* Initialize the ltc4151 device structure */
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priv = (FAR struct ltc4151_dev_s *)kmm_malloc(sizeof(struct ltc4151_dev_s));
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if (priv == NULL)
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{
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snerr("ERROR: Failed to allocate instance\n");
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return -ENOMEM;
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}
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priv->i2c = i2c;
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priv->addr = addr;
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priv->shunt_resistor_value = shunt_resistor_value;
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/* Register the character driver */
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ret = register_driver(devpath, &g_ltc4151fops, 0666, priv);
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if (ret < 0)
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{
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snerr("ERROR: Failed to register driver: %d\n", ret);
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kmm_free(priv);
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}
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sninfo("ltc4151 (addr=0x%02x) registered at %s\n", priv->addr, devpath);
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return ret;
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}
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#endif /* CONFIG_I2C && CONFIG_LTC4151 */
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129
include/nuttx/sensors/ltc4151.h
Normal file
129
include/nuttx/sensors/ltc4151.h
Normal file
@ -0,0 +1,129 @@
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/****************************************************************************
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* include/nuttx/sensors/ltc4151.h
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*
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* Copyright (C) 2017 Giorgio Groß. All rights reserved.
|
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* Author: Giorgio Groß <giorgio.gross@robodev.eu>
|
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*
|
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* 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.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
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#ifndef __INCLUDE_NUTTX_SENSORS_LTC4151_H
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#define __INCLUDE_NUTTX_SENSORS_LTC4151_H
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/****************************************************************************
|
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* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
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#include <nuttx/sensors/ioctl.h>
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#include <fixedmath.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_LTC4151)
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/****************************************************************************
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* Pre-processor Definitions
|
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****************************************************************************/
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#define CONFIG_LTC4151_BASEADDR 0x66
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#define CONFIG_LTC4151_ADDR0 (CONFIG_LTC4151_BASEADDR + 0)
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#define CONFIG_LTC4151_ADDR1 (CONFIG_LTC4151_BASEADDR + 1)
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#define CONFIG_LTC4151_ADDR2 (CONFIG_LTC4151_BASEADDR + 2)
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#define CONFIG_LTC4151_ADDR3 (CONFIG_LTC4151_BASEADDR + 3)
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#define CONFIG_LTC4151_ADDR4 (CONFIG_LTC4151_BASEADDR + 4)
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#define CONFIG_LTC4151_ADDR5 (CONFIG_LTC4151_BASEADDR + 5)
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#define CONFIG_LTC4151_ADDR6 (CONFIG_LTC4151_BASEADDR + 6)
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#define CONFIG_LTC4151_ADDR7 (CONFIG_LTC4151_BASEADDR + 7)
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#define CONFIG_LTC4151_ADDR8 (CONFIG_LTC4151_BASEADDR + 8)
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#define CONFIG_LTC4151_ADDR9 (CONFIG_LTC4151_BASEADDR + 9)
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/* LTC4151 Register Definitions ***********************************************/
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/* LTC4151 Registers addresses */
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#define LTC4151_CURR_REG 0x00 /* Current Register start address */
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#define LTC4151_VOLT_REG 0x02 /* Voltage Register start address*/
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#define LTC4151_VALUE_MSB_MASK 0x00ff
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#define LTC4151_VALUE_LSB_MASK 0x0f00
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/* NOTE: When meassurement values are read, they are return as b16_t, fixed
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* precision integer values (see include/fixedmath.h).
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*/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct i2c_master_s;
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typedef struct ltc4151_t {
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b16_t current; // [milliampere]
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b16_t voltage; // [volt]
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} ltc4151_t;
|
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|
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/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
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#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