/*!
 LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

@verbatim
 SPI DATA FORMAT (MSB First):

 Write Sequence:
       Byte #1                    Byte #2
 MOSI: A6 A5 A4 A3 A2 A1 A0 W   D7 D6 D5 D4 D3 D2 D1 D0
 MISO: X  X  X  X  X  X  X  X   X  X  X  X  X  X  X  X

 Read Sequence:
       Byte #1                    Byte #2
 MOSI: A6 A5 A4 A3 A2 A1 A0 R   X  X  X  X  X  X  X  X
 MISO: X  X  X  X  X  X  X  X   D7 D6 D5 D4 D3 D2 D1 D0

 W    : SPI Write (0)
 R    : SPI Read  (1)
 Ax   : Address
 Dx   : Data Bits
 X    : Don't care

@endverbatim

http://www.linear.com/product/LTC6945

http://www.linear.com/product/LTC6945#demoboards


Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

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   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
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/*! @file
    @ingroup LTC6945
    Header for LTC6945: Ultralow Noise and Spurious 0.35GHz to 6.39GHz Integer-N Synthesizer
*/

#ifndef LTC6945_H

#define LTC6945_H


//! Define the SPI CS pin
#ifndef LTC6945_CS
#define LTC6945_CS QUIKEVAL_CS  //! SPI Chip Select Pin
#endif


/*! @name LTC6945 Registers Fields in Alphabetical Order */
#define LTC6945_BST 1   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CP 2   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPCHI 3   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPCLO 4   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPDN 5   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPINV 6   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPMID 7   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPRST 8   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPUP 9   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_CPWIDE 10   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_FILT 11   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_LKCT 12   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_LKEN 13   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_LKWIN 14   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_LOCK 15   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_ND 16   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_OD 17   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_OMUTE 18   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_PART 19   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_PDALL 20   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_PDOUT 21   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_PDPLL 22   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_PDREFO 23   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_POR 24   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_RD 25   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_REV 26   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_RFO 27   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_THI 28   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_TLO 29   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_UNLOCK 30   //!<  for spi_map array, defines location for field specific information used to create the spi map
#define LTC6945_x 31   //!<  for spi_map array, defines location for field specific information used to create the spi map

#define LTC6945_NUM_REGADDR 12  //!< Defines number of LTC6945 SPI registers, used in spi_map array
#define LTC6945_NUM_REGFIELD 31 //!< Defines number of LTC6945 SPI fields, used in spi_map array

#define ADDRx 0                 //!< used for 2nd dim of 2d spi_map array
#define DxMSB 1                 //!< used for 2nd dim of 2d spi_map array
#define NUMBITS 2               //!< used for 2nd dim of 2d spi_map array
#define R_ONLY 3                //!< used for 2nd dim of 2d spi_map array

#define OneMHz 1000000L         //!< 1MHz in long format, used in 64 bit math

#define LTC6945_MINFREQ 350   //!< LTC6945 lower freq limit
#define LTC6945_MAXFREQ 6000  //!< LTC6945 upper freq limit

#define LTC6945_MIN_REF_FREQ 10  //!< LTC6945 lower reference frequency limit
#define LTC6945_MAX_REF_FREQ 250 //!< LTC6945 upper reference frequency limit

//! @} */

/* ------------------------------------------------------------------------- */
//! LTC6945 Read Single Address
//!  reads 8 bit Data field to LTC6945.
//!  has to shift data by one bit to account for RW bit
//! @return data that was read from address
uint8_t LTC6945_read(uint8_t cs,    //!< Chip Select Pin
                     int8_t address //!< Register address for the LTC6945.
                    );


/* ------------------------------------------------------------------------- */
//! LTC6945 Read Single Field
//! For SPI FIELDS located in 1 or multiple address location
//!  reads specific address locations
//!  identifies and returns specific field in question
//!  can handle SPI fields in multiple addresses, if MSB bit is in the lower number address
//! @return data that was read from field
long LTC6945_read_field(uint8_t cs,       //!< Chip Select Pin
                        uint8_t address,  //!< Register address for the LTC6945.
                        uint8_t MSB_loc,  //!< MSB bit location of field
                        uint8_t numbits   //!< length of field (i.e. number of bits in field)
                       );


/* ------------------------------------------------------------------------- */
//! Gets the LTC6945 SPI field value
//! calls function LTC6945_read_field, which
//!  reads specific address locations
//!  identifies and returns specific field in question
//!  can handle SPI fields in multiple addresses, if MSB bit is in the lower number address
//! @return data that was read from field
long get_LTC6945_SPI_FIELD(uint8_t cs,          //!< Chip Select Pin
                           uint8_t f            //!< SPI field number
                          );


/* ------------------------------------------------------------------------- */
//! LTC6945 Write Single Address
//!  writes 8 bit Data field to LTC6945.
//!  has to shift data by one bit to account for RW bit
//! @return void
void LTC6945_write(uint8_t cs,                  //!< Chip Select Pin
                   uint8_t address,             //!< Register address for the LTC6945.
                   uint8_t Data                 //!< 8-bit data to be written to register
                  );


/* ------------------------------------------------------------------------- */
//! LTC6945 Write Single Field
//!  For SPI FIELDS in 1 or multiple address locations
//!  reads specific address/field location then writes to specific field
//!  can handle SPI fields in multiple addresses, if MSB bit is in the lower number address
//! @return void
uint8_t LTC6945_write_field(uint8_t cs,        //!< Chip Select Pin
                            long field_data,   //!< Value field value to be set to
                            uint8_t address,   //!< Register address for the LTC6945.
                            uint8_t MSB_loc,   //!< MSB bit location of field
                            uint8_t numbits   //!< length of field (i.e. number of bits in field)
                           );


/* ------------------------------------------------------------------------- */
//! Sets the LTC6945 SPI field value
//! calls function LTC6945_read_field, which
//!  reads specific address/field location then writes to specific field
//!  can handle SPI fields in multiple addresses, if MSB bit is in the lower number address
//! @return void
void set_LTC6945_SPI_FIELD(uint8_t cs,          //!< Chip Select Pin
                           uint8_t f,           //!< SPI field number
                           long field_data      //!< Value field value to be set to
                          );


/* ------------------------------------------------------------------------- */
//! Writes values to ALL LTC6945 RW addresses
//! @return void
void set_LTC6945_ALLREGS(uint8_t cs,            //!< Chip Select Pin
                         uint8_t reg01,         //!< LTC6945 register 1
                         uint8_t reg02,         //!< LTC6945 register 2
                         uint8_t reg03,         //!< LTC6945 register 3
                         uint8_t reg04,         //!< LTC6945 register 4
                         uint8_t reg05,         //!< LTC6945 register 5
                         uint8_t reg06,         //!< LTC6945 register 6
                         uint8_t reg07,         //!< LTC6945 register 7
                         uint8_t reg08,         //!< LTC6945 register 8
                         uint8_t reg09,         //!< LTC6945 register 9
                         uint8_t reg0A          //!< LTC6945 register 10
                        );

/* ------------------------------------------------------------------------- */
//! Initializes the SPI MAP arrays
//! The values set in initialization are used for all the LTC6945 SPI/WRITE and
//! read functions (set_LTC6945_SPI_FIELD, get_LTC6945_SPI_FIELD,
//! LTC6945_read, LTC6945_write, etc, etc)
//! @return void
void LTC6945_init();


/* ------------------------------------------------------------------------- */
//! returns # of addresses in parts register map (array size)
//! @return # of addresses in parts register map
uint8_t get_LTC6945_REGSIZE();


/* ------------------------------------------------------------------------- */
//! returns the number of bits for a given field name in the SPI map
//! @return the number of bits for a given field name in the SPI map
uint8_t get_LTC6945_SPI_FIELD_NUMBITS(uint8_t f //!< SPI field number
                                     );


/* ------------------------------------------------------------------------- */
//! returns if the given field name is (0)read/write or (1)read_only field
//! @return if the given field is a (0)read/write or (1)read_only field
uint8_t get_LTC6945_SPI_FIELD_RW(uint8_t f   //!< SPI field number
                                ) ;


/* ------------------------------------------------------------------------- */
//! calculates the output divider setting based on the frf and on board
//! VCO frequencies of LTC6945
//! @return odiv = 1-6 divider setting for valid frequency, or 999 for invalid frequency
unsigned long LTC6945_calc_odiv(unsigned long frf[2]    //!< output frequency
                               );

/* ------------------------------------------------------------------------- */
//! FUNCTION: LTC6945_set_frf
//!  Calculates the integer (N), fractional (NUM) and output divider (OD) SPI values
//!  using self created 64bit math functions.
//!
//! Datasheet equations:
//! - fvco = fpfd*(N + F)
//! - frf  = fvco/O
//! - fpfd = fref/R
//!
//!    can be modified to the following equations:
//!    - N   = (int) (fvco/fpfd)  = (int) frf*O*R/fref
//!
//!    where:
//!    - N = ndiv, O= odiv in the code below
//!
//!    Linduino One (Arduino Uno) is limited to 32 bit floats/double/long.
//!    32 bit math functions will create rounding errors with the above equations,
//!    that can result in frequency errors.
//!    Therefore, the following code uses self created 64bit functions for 64bit integer math.
//!
//!    - frf (33 bits) LTC6945 max frf/fvco = 6.0GHZ, which is 23 bit number (2^33 = 8.59G)
//!    - fref (23 bits) LTC6945 min fref = 10MHz, which is a 23 bit number (2^23 = 8.3M)
//!    - O   (3 bits)
//!    - R   (10 bits)
//!
//!    step 1: create 64 bit frf and fref numbers
//!
//!    step 2: calculate O (output divider)
//!
//!    step 3: get current R-divider setting
//!
//!    step 4: calculate frf*O*R
//!    - max bit count/resolution: 33b+3b+10b= 46b
//!
//!    step 5: calculate N(16b), using value from step 1
//!    - N = (int) frf*O*R/fref
//!    - max bit count/resolution: 46b-23b = 13b
//!
//! @return void
void LTC6945_set_frf();


/* ------------------------------------------------------------------------- */
//! sets globals LTC6945_Fref_MHz and LTC6945_Fref_Hz
//! @return void
void set_LTC6945_global_fref(unsigned long fref_MHz, unsigned long fref_Hz);


/* ------------------------------------------------------------------------- */
//! sets globals LTC6945_Frf_MHz and LTC6945_Frf_Hz
//! @return void
void set_LTC6945_global_frf(unsigned long frf_MHz, unsigned long frf_Hz);

/* ------------------------------------------------------------------------- */
//! sets globals LTC6945_VCO_Max_Freq_MHz, LTC6945_VCO_Max_Freq_Hz, LTC6945_VCO_Min_Freq_MHz and LTC6945_VCO_Min_Freq_Hz
//! @return void
void set_LTC6945_global_vcolim(unsigned long fvco_max_MHz, unsigned long fvco_max_Hz, unsigned long fvco_min_MHz, unsigned long fvco_min_Hz);


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_Fref_MHz
//! @return LTC6945_Fref_MHz
unsigned long get_LTC6945_global_fref_MHz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_Fref_Hz
//! @return LTC6945_Fref_Hz
unsigned long get_LTC6945_global_fref_Hz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_Frf_MHz
//! @return LTC6945_Frf_MHz
unsigned long get_LTC6945_global_frf_MHz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_Frf_Hz
//! @return LTC6945_Frf_Hz
unsigned long get_LTC6945_global_frf_Hz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_VCO_Max_Freq_MHz
//! @return LTC6945_VCO_Max_Freq_MHz
unsigned long get_LTC6945_global_VCO_MAX_MHz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_VCO_Min_Freq_MHz
//! @return LTC6945_VCO_Min_Freq_MHz
unsigned long get_LTC6945_global_VCO_MIN_MHz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_VCO_Max_Freq_Hz
//! @return LTC6945_VCO_Max_Freq_Hz
unsigned long get_LTC6945_global_VCO_MAX_Hz();


/* ------------------------------------------------------------------------- */
//! returns global LTC6945_VCO_Min_Freq_Hz
//! @return LTC6945_VCO_Min_Freq_Hz
unsigned long get_LTC6945_global_VCO_MIN_Hz();


/* ------------------------------------------------------------------------- */
//!   create a 64 bit Hz number from
//!   32 bit xxxx MHz number and 32 bit yyy yyy Hz number.
//!   A) if an < 2^32 bits:
//!      - an(upper 32b) = 0;
//!      - an(lower 32b) = MHzPart(32b)*1MHz + HzPart (32b)
//!
//!   B) if an > 2^32 bits (4,294,967,296):
//!     - an(upper 32b) = 1
//!     - an(lower 32b) = ((MHzPart-4294)*1MHz+HzPart)-967296
//! @return void
void HZto64(unsigned long  an[],            //!< 64 bit number, 1x2 32 bit array
            unsigned long MHzPart,          //!< integer in MHZ
            unsigned long HzPart            //!< integer in Hz
           );

/* ------------------------------------------------------------------------- */
//! Creates a equivalent 64 bit number from 2 32 bit numbers
//! - an[0]=bigPart    upper 32 bits
//! - an[1]=littlePart lower 32 bits
//! @return void
void init64(unsigned long an[],        //!< 64 bit number, 1x2 32 bit array
            unsigned long bigPart,     //!< upper 32 bits
            unsigned long littlePart   //!< lower 32 bits
           );

/* ------------------------------------------------------------------------- */
//! Single Bit shift left of equivalent 64 bit number (an[] = an[]<<1)
//! @return void
void shl64(unsigned long  an[]         //!<  an[] = an[]<<1
          );

/* ------------------------------------------------------------------------- */
//! Multi Bit shift left of equivalent 64 bit number (an[] = an[]<<shiftnum)
//! @return void
void shl64by(unsigned long  an[],     //!<  an[] = an[]<<shiftnum
             uint8_t shiftnum         //!<  number of bits to shift left
            );

/* ------------------------------------------------------------------------- */
//! Single Bit shift right of equivalent 64 bit number (an[] = an[]<<1)
//! @return void
void shr64(unsigned long  an[]        //!<  an[] = an[]>>shiftnum
          );

/* ------------------------------------------------------------------------- */
//! Multi Bit shift right of equivalent 64 bit number (an[] = an[]>>shiftnum)
//! @return void
void shr64by(unsigned long  an[],     //!<  an[] = an[]>>shiftnum
             uint8_t shiftnum         //!<  number of bits to shift right
            );

/* ------------------------------------------------------------------------- */
//! 64 bit Add ann to an (an[] = an[] + ann[])
//! @return void
void add64(unsigned long  an[],      //!<  64 bit number, in 1x2 32bit array
           unsigned long  ann[]      //!<  64 bit number, in 1x2 32bit array
          );

/* ------------------------------------------------------------------------- */
//! 64 bit Subtract ann from an (an[] = an[] - ann[])
//! @return void
void sub64(unsigned long  an[],      //!<  64 bit number, in 1x2 32bit array
           unsigned long  ann[]      //!<  64 bit number, in 1x2 32bit array
          );

/* ------------------------------------------------------------------------- */
//! 64 bit, if an == ann, then true
//! @return true, if an==ann; false, if an<>ann
boolean eq64(unsigned long  an[],    //!<  64 bit number, in 1x2 32bit array
             unsigned long  ann[]    //!<  64 bit number, in 1x2 32bit array
            );

/* ------------------------------------------------------------------------- */
//! 64 bit, if an < ann, then true
//! @return true, if an<ann; false, if an=>ann
boolean lt64(unsigned long  an[],     //!<  64 bit number, in 1x2 32bit array
             unsigned long  ann[]     //!<  64 bit number, in 1x2 32bit array
            );

/* ------------------------------------------------------------------------- */
//! 64 bit Divide,   num=num/div
//! @return void
void div64(unsigned long num[],    //!<  numerator: 64 bit number, in 1x2 32bit array
           unsigned long den[]     //!<  denominator: 64 bit number, in 1x2 32bit array
          );


/* ------------------------------------------------------------------------- */
//! 64 bit multiply,   an=an*ann
//! @return void
void mul64(unsigned long an[],     //!<  64 bit number, in 1x2 32bit array
           unsigned long ann[]     //!<  64 bit number, in 1x2 32bit array
          );

/* ------------------------------------------------------------------------- */
//! Prints HEX representation of 64 bit an
//! @return void
void prt(unsigned long  an[]       //!<  64 bit number, in 1x2 32bit array
        );

#endif  // LTC6945_H