/*!
LTC1592: 16-bit SoftSpan DAC with Programmable Output Range

@verbatim

The LTC1592 is a 16-bit serial input DAC that operates on a single 5V supply.
It can be software-programmed for either unipolar or bipolar mode. It can
also be programmed for different output voltage ranges - two output ranges in
unipolar mode and four output ranges in bipolar mode.

The device includes an internal deglitcher circuit that reduces the glitch
impulse to less than 2nV-s (typ).

When the CS/LD is brought to a logic low, the data on the SDI input is loaded
into the shift register on the rising edge of the clock.  A 4-bit command word
(C3 C2 C1 C0), followed by four “don’t care” bits and 16 data bits(MSB-first)
is the minimum loading sequence required. When the CS/LD is brought to a logic
high, the clock is disabled internally and the command word is executed.

SPI DIN FORMAT (MSB First):

Byte #1                     Byte #2                        Byte #3
C3 C2 C1 C0  X  X   X   X   D15 D14 D13 D12 D11 D10 D9 D8  D7 D6 D5 D4 D3 D2 D1 D0

@endverbatim

http://www.linear.com/product/LTC1592

http://www.linear.com/product/LTC1592#demoboards

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*/

//! @ingroup Digital_to_Analog_Converters
//! @{
//! @defgroup LTC1592 LTC1592: 16-bit SoftSpan DAC with Programmable Output Range
//! @}

/*! @file
    @ingroup LTC1592
    Library for LTC1592: 16-bit SoftSpan DAC with Programmable Output Range
*/

#include "LT_SPI.h"
#include "Linduino.h"
#include <SPI.h>

// Transmits 24 bit input stream: 4-bit command + 4-bit don't-care + 16-bit data
void LTC1592_write(uint8_t cs, uint8_t dac_command, uint16_t data)
{
  output_low(cs);
  delay(100);
  spi_write(dac_command);
  spi_write((uint8_t)(data >> 8));  //D15:D8
  spi_write((uint8_t)data);     //D7:D0
  delay(100);
  output_high(cs);
}

// Calculates the voltage from ADC output data depending on the channel configuration
float LTC1592_code_to_voltage(uint16_t data, float RANGE_HIGH, float RANGE_LOW)
{
  float voltage;
  voltage = (RANGE_HIGH - RANGE_LOW) * data / 0xFFFF + RANGE_LOW;
  return voltage;
}

// Calculates the 16 bit data code from voltage
uint16_t LTC1592_voltage_to_code(float voltage, float RANGE_HIGH, float RANGE_LOW)
{
  float code;
  code = (voltage - RANGE_LOW) * (0xFFFF / (RANGE_HIGH - RANGE_LOW));
  return code;
}