/*!
LTC2944: Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement

@verbatim

The LTC®LTC2944 measures battery charge state, battery voltage,
battery current and its own temperature in portable
product applications. The wide input voltage range allows
use with multicell batteries up to 60V. A precision coulomb
counter integrates current through a sense resistor between
the battery’s positive terminal and the load or charger.
Voltage, current and temperature are measured with an
internal 16-bit No Latency ΔΣ™ ADC. The measurements
are stored in internal registers accessible via the onboard
I2C/SMBus Interface

@endverbatim

http://www.linear.com/product/LTC2944

http://www.linear.com/product/LTC2944#demoboards


Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
 - 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.
 - Neither the name of Analog Devices, Inc. nor the names of its
   contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.
 - The use of this software may or may not infringe the patent rights
   of one or more patent holders.  This license does not release you
   from the requirement that you obtain separate licenses from these
   patent holders to use this software.
 - Use of the software either in source or binary form, must be run
   on or directly connected to an Analog Devices Inc. component.

THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
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LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
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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.
*/

//! @ingroup Power_Monitors
//! @{
//! @defgroup LTC2944 LTC2944: Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
//! @}

/*! @file
   @ingroup LTC2944
   Library for LTC2944 Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
*/


#include <Arduino.h>
#include <stdint.h>
#include "Linduino.h"
#include "LT_I2C.h"
#include "LTC2944.h"
#include <Wire.h>

// Write an 8-bit code to the LTC2944.
int8_t LTC2944_write(uint8_t i2c_address, uint8_t adc_command, uint8_t code)
// The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
{
  int32_t ack;

  ack = i2c_write_byte_data(i2c_address, adc_command, code);
  return(ack);
}


// Write a 16-bit code to the LTC2944.
int8_t LTC2944_write_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t code)
// The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
{
  int8_t ack;

  ack = i2c_write_word_data(i2c_address, adc_command, code);
  return(ack);
}

// Reads an 8-bit adc_code from LTC2944
int8_t LTC2944_read(uint8_t i2c_address, uint8_t adc_command, uint8_t *adc_code)
// The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
{
  int32_t ack;

  ack = i2c_read_byte_data(i2c_address, adc_command, adc_code);

  return(ack);
}

// Reads a 16-bit adc_code from LTC2944
int8_t LTC2944_read_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code)
// The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
{
  int32_t ack;

  ack = i2c_read_word_data(i2c_address, adc_command, adc_code);

  return(ack);
}


float LTC2944_code_to_coulombs(uint16_t adc_code, float resistor, uint16_t prescalar)
// The function converts the 16-bit RAW adc_code to Coulombs
{
  float coulomb_charge;
  coulomb_charge =  1000*(float)(adc_code*LTC2944_CHARGE_lsb*prescalar*50E-3)/(resistor*4096);
  coulomb_charge = coulomb_charge*3.6f;
  return(coulomb_charge);
}

float LTC2944_code_to_mAh(uint16_t adc_code, float resistor, uint16_t prescalar )
// The function converts the 16-bit RAW adc_code to mAh
{
  float mAh_charge;
  mAh_charge = 1000*(float)(adc_code*LTC2944_CHARGE_lsb*prescalar*50E-3)/(resistor*4096);
  return(mAh_charge);
}

float LTC2944_code_to_voltage(uint16_t adc_code)
// The function converts the 16-bit RAW adc_code to Volts
{
  float voltage;
  voltage = ((float)adc_code/(65535))*LTC2944_FULLSCALE_VOLTAGE;
  return(voltage);
}

float LTC2944_code_to_current(uint16_t adc_code, float resistor)
// The function converts the 16-bit RAW adc_code to Amperes
{
  float current;
  current = (((float)adc_code-32767)/(32767))*((float)(LTC2944_FULLSCALE_CURRENT)/resistor);
  return(current);
}

float LTC2944_code_to_kelvin_temperature(uint16_t adc_code)
// The function converts the 16-bit RAW adc_code to Kelvin
{
  float temperature;
  temperature = adc_code*((float)(LTC2944_FULLSCALE_TEMPERATURE)/65535);
  return(temperature);
}

float LTC2944_code_to_celcius_temperature(uint16_t adc_code)
// The function converts the 16-bit RAW adc_code to Celcius
{
  float temperature;
  temperature = adc_code*((float)(LTC2944_FULLSCALE_TEMPERATURE)/65535) - 273.15;
  return(temperature);
}

// Used to set and clear bits in a control register.  bits_to_set will be bitwise OR'd with the register.
// bits_to_clear will be inverted and bitwise AND'd with the register so that every location with a 1 will result in a 0 in the register.
int8_t LTC2944_register_set_clear_bits(uint8_t i2c_address, uint8_t register_address, uint8_t bits_to_set, uint8_t bits_to_clear)
{
  uint8_t register_data;
  int8_t ack = 0;

  ack |= LTC2944_read(i2c_address, register_address, &register_data);
  register_data = register_data & (~bits_to_clear);
  register_data = register_data | bits_to_set;
  ack |= LTC2944_write(i2c_address, register_address, register_data);
  return(ack);
}