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The INA219 is a combined voltage and current sensor that can measure up to 26 volts and a current that depends on an external shunt resistor. Connection happens via i2c/smbus and the chip features a power supply rail that is independent from the measured voltage, so it can measure low voltages.
This commit adds a driver for this chip. Right now it measures bus voltage and current, and does not use the internal calibrated current reading, nor the available power measurement.
This commit is contained in:
Sebastien Lorquet
committed by
Gregory Nutt
Gregory Nutt
parent
4a3c1ef2ac
commit
d16d4d5568
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/****************************************************************************
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* include/nuttx/sensors/ina219.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
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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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#ifndef __INCLUDE_NUTTX_SENSORS_INA219_H
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#define __INCLUDE_NUTTX_SENSORS_INA219_H
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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 <nuttx/sensors/ioctl.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_INA219)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* INA219 Register Definitions ***********************************************/
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/* INA219 Config Register bits */
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#define INA219_CONFIG_SADC_SHIFT 3
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#define INA219_CONFIG_SADC_MASK (15 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_9BIT ( 0 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_10BIT ( 1 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_11BIT ( 2 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_12BIT ( 3 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG2 ( 9 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG4 (10 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG8 (11 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG16 (12 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG32 (13 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG64 (14 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_SADC_AVG128 (15 << INA219_CONFIG_SADC_SHIFT)
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#define INA219_CONFIG_BADC_SHIFT 7
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#define INA219_CONFIG_BADC_MASK (15 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_9BIT ( 0 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_10BIT ( 1 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_11BIT ( 2 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_12BIT ( 3 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG2 ( 9 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG4 (10 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG8 (11 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG16 (12 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG32 (13 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG64 (14 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_BADC_AVG128 (15 << INA219_CONFIG_BADC_SHIFT)
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#define INA219_CONFIG_PGA_X1 (0 << 11) /* 40 mV shunt voltage range */
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#define INA219_CONFIG_PGA_X2 (1 << 11) /* 80 mV shunt voltage range */
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#define INA219_CONFIG_PGA_X4 (2 << 11) /* 160 mV shunt voltage range */
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#define INA219_CONFIG_PGA_X8 (3 << 11) /* 320 mV shunt voltage range */
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#define INA219_CONFIG_RANGE_16V 0
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#define INA219_CONFIG_RANGE_32V (1 << 13)
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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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struct ina219_s
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{
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uint32_t voltage; /* [microvolt] max 4.2 kV - device max 26V */
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int32_t current; /* [microampere] max 2.1 kA - sensor is bidirectional */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: ina219_register
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*
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* Description:
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* Register the ina219 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 INA219
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* addr - The I2C address of the INA219. The base I2C address of the INA219
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* is 0x40. Bits 0-3 can be controlled to get 16 unique addresses from 0x40
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* through 0x4f.
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* shuntval - resistor value in microohms
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* config - a combination of the constants defined earlier in this file
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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 ina219_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
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uint8_t addr, int32_t shuntval, uint16_t config);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_I2C && CONFIG_SENSORS_INA219 */
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#endif /* __INCLUDE_NUTTX_SENSORS_INA219_H */
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