/*!
LTC4151: High Voltage I2C Current and Voltage Monitor

@verbatim

The LTC4151 is a high side power monitor that operates over a wide voltage range
of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously
measures high side current, input voltage and an external voltage. Data is
reported through the I2C interface when polled by a host. The LTC4151 can also
perform on-demand measurement in a snapshot mode. The LTC4151 features a
dedicated shutdown pin to reduce power consumption. The LTC4151-1/LTC4151-2
feature split I2C data pins to drive opto-isolators. The data out on the
LTC4151-1 is inverted while that on the LTC4151-2 is not.

@endverbatim

http://www.linear.com/product/LTC4151

http://www.linear.com/product/LTC4151#demoboards


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*/

//! @ingroup Power_Monitors
//! @{
//! @defgroup LTC4151 LTC4151: High Voltage I2C Current and Voltage Monitor
//! @}

/*! @file
    @ingroup LTC4151
    Library for LTC4151: High Voltage I2C Current and Voltage Monitor
*/

#include <Arduino.h>
#include "Linduino.h"
#include "LT_I2C.h"
#include "LTC4151.h"
#include <Wire.h>

// Write one byte to an LTC4151 register.
int8_t LTC4151_write(uint8_t i2c_address, uint8_t adc_command, uint8_t code)
{
  int32_t ack;

  ack = i2c_write_byte_data(i2c_address, adc_command, code);

  return(ack);
}

// Reads a 12-bit value from LTC4151
int8_t LTC4151_read_12_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code)
{
  int32_t ack = 0;

  ack = i2c_read_word_data(i2c_address, adc_command, adc_code);

  *adc_code >>= 4;

  return(ack);
}

// Note that the following functions are somewhat contrived, and the units are arbitrary.  LTC4151_ADIN_voltage could be given an LSB
// weight (LTC4151_adin_lsb) in volts instead of mV, and the returned voltage will be in volts instead of mV.
// Similarly, the LTC4151_sense_current function could be written to accept an LSB weight in amps or milliamps.
// That would eliminate the extra floating point divide operation based on the sense resistor value.

// Calculates the LTC4151 sense current in Amps given "resistor" value in ohms and "LTC4151_sense_lsb" LSB weight in volts.
float LTC4151_code_to_sense_current(uint16_t adc_code, float resistor, float LTC4151_sense_lsb)
{
  float voltage, current;
  voltage = (float)adc_code * LTC4151_sense_lsb;    //! 1) Convert code to voltage from sense lsb
  current = voltage / resistor;                     //! 2) Calculate Current, I = V/R
  return (current);
}

// Calculates the LTC4151 V_IN voltage given "LTC_vin_lsb" LSB weight in volts
float LTC4151_code_to_vin_voltage(uint16_t adc_code, float LTC4151_vin_lsb)
{
  float voltage;
  voltage = (float)adc_code * LTC4151_vin_lsb;  //! 1) Convert code to voltage from VIN lsb
  return (voltage);
}

// Calculates the LTC4151 ADIN voltage in mV given "LTC4151_adin_lsb" LSB weight in mV
float LTC4151_code_to_ADIN_voltage(uint16_t adc_code, float LTC4151_adin_lsb)
{
  float voltage;
  voltage = (float)adc_code * LTC4151_adin_lsb; //! 1) Convert Code to voltage from ADIN lsb
  return (voltage);
}