133 lines
5.1 KiB
C
133 lines
5.1 KiB
C
/****************************************************************************
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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
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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_LTC4151_H
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#define __INCLUDE_NUTTX_SENSORS_LTC4151_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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#include <fixedmath.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_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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struct ltc4151_s
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{
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b16_t current; /* [milliampere] */
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b16_t voltage; /* [volt] */
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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: 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.
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* The base I2C address of the LTC4151 is 0x18.
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* Bits 0-3 can be controlled to get 8 unique addresses from 0x18
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* through 0x1f.
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* shunt_resistor_value - resistor value in ohm
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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,
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uint8_t addr, float shunt_resistor_value);
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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_LTC4151 */
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#endif /* __INCLUDE_NUTTX_SENSORS_LTC4151_H */
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