/*!
LTC2642: 16-/14-/12-Bit VOUT DAC with SPI Interface
LTC2641: 16-/14-/12-Bit VOUT DAC with SPI Interface

@verbatim

The LTC2641/LTC2642 are families of 16-,14 and 12-bit unbuffered voltage output
DACs. These DACs operate from 2.7V to 5.5V supply and are monotonic over
temperature.

They communicate via SPI interface. 16 bits of data are loaded through DIN
after a high-to-low transition of CS (MSB first). After 16 data bits have
been loaded into the serial input register, a low-to-high transition on CS
transfers the data to the 16-bit DAC latch, updating the DAC output.

For the 14-bit DACs, (LTC2641-14/LTC2642-14), the MSB remains in the same
(left-justified) position in the input 16-bit data word. Therefore, two
“don’t-care” bits must be loaded after the LSB, to make up the required
16 data bits. Similarly, for the 12-bit family members(LTC2641-12/LTC2642-12)
four “don’t-care” bits must follow the LSB.

@endverbatim

http://www.linear.com/product/LTC2642
http://www.linear.com/product/LTC2641

http://www.linear.com/product/LTC2642#demoboards
http://www.linear.com/product/LTC2641#demoboards

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*/

/*! @file
    @ingroup LTC2642
    Header for LTC2642: 16-/14-/12-Bit VOUT DAC with SPI Interface
*/

#ifndef LTC2642_H
#define LTC2642_H

//! Define the SPI CS pin
#ifndef LTC2642_CS
#define LTC2642_CS QUIKEVAL_CS
#endif

#define UNIPOLAR  1
#define BIPOLAR   2

//! Writes the 16-bit data into the DAC
//! @return void
void LTC2642_write(uint8_t cs,            //!< Chip Select Pin
                   uint16_t data          //!< 16-bit digital input data
                  );
//! Calculates the output voltage from the given digital code and reference voltage
//! @return Floating point voltage
float LTC2642_code_to_voltage(uint16_t data,    //!< 16-bit digital input data
                              float reference_voltage,      //!< Reference voltage
                              uint8_t range  //!< Unipolar/Bipolar
                             );
//! Calculates the 16 bit data code from voltage
//! @return 16-bit code
uint16_t LTC2642_voltage_to_code(float voltage,   //!< Analog voltage to be converted into code
                                 float reference_voltage,     //!< Reference Voltage
                                 uint8_t range  //!< Unipolar/Bipolar
                                );
#endif      //LTC2642_H