/*!
LTC2312-12: 12-Bit, 500Ksps ADC.
LTC2312-14: 14-Bit, 500Ksps ADC.
LTC2313-12: 12-Bit, 2.5Msps ADC
LTC2313-14: 14-Bit, 2.5Msps ADC
LTC2314-14: 14-Bit, 4.5Msps ADC
LTC2315-12: 12-Bit, 5Msps ADC

@verbatim

The following parts (DUT) are pin-compatible, 12/14-bit A/D converters with serial I/O, and an internal reference:
LTC2312-12: 12-Bit, 500Ksps ADC.
LTC2312-14: 14-Bit, 500Ksps ADC.
LTC2313-12: 12-Bit, 2.5Msps ADC
LTC2313-14: 14-Bit, 2.5Msps ADC
LTC2314-14: 14-Bit, 4.5Msps ADC
LTC2315-12: 12-Bit, 5Msps ADC

@endverbatim

http://www.linear.com/product/LTC2312-12
http://www.linear.com/product/LTC2312-14
http://www.linear.com/product/LTC2313-12
http://www.linear.com/product/LTC2313-14
http://www.linear.com/product/LTC2314-14
http://www.linear.com/product/LTC2315-12

http://www.linear.com/product/LTC2312-12#demoboards
http://www.linear.com/product/LTC2312-14#demoboards
http://www.linear.com/product/LTC2313-12#demoboards
http://www.linear.com/product/LTC2313-14#demoboards
http://www.linear.com/product/LTC2314-14#demoboards
http://www.linear.com/product/LTC2315-12#demoboards


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*/

//! @ingroup Analog_to_Digital_Converters
//! @{
//! @defgroup LTC2315 LTC2315: 12/14-Bit 1Msps ADC
//! @}

/*! @file
    @ingroup LTC2315
    Library for LTC2315: 12/14-Bit 1Msps ADC
*/

#include <Arduino.h>
#include <stdint.h>
#include "Linduino.h"
#include "LT_SPI.h"
#include "LTC2315.h"
#include <SPI.h>


// Reads the ADC  and returns 16-bit data
void LTC2315_read(uint8_t cs, uint16_t *adc_code)
{
  uint16_t dummy_command = 0;

  spi_transfer_word(cs, dummy_command, adc_code);
}


// Calculates the voltage corresponding to an adc code in offset binary, given the reference voltage (in volts)
float LTC2315_code_to_voltage(uint16_t adc_code, uint8_t shift, float vref)
{
  float voltage;

  adc_code = adc_code << shift;  //the data is left justified to bit_14 of a 16 bit word

  voltage = (float)adc_code;
  voltage = voltage / (pow(2,16)-1);    //! 2) This calculates the input as a fraction of the reference voltage (dimensionless)
  voltage = voltage * vref;           //! 3) Multiply fraction by Vref to get the actual voltage at the input (in volts)

  return(voltage);
}