| Linduino 1.3.0 Linear Technology Arduino-Compatible Demonstration Board

Functions | Variables
LTC6945.cpp File Reference
RF, Silicon Oscillators, PLL Synthesizers, and VCOs » LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

Library for LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer. More...

## Detailed Description

Library for LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer.

Definition in file LTC6945.cpp.

Go to the source code of this file.

## Functions
uint8_t | LTC6945_read (uint8_t cs, int8_t address)
| LTC6945 Read Single Address reads 8 bit Data field to LTC6945. More...
long | LTC6945_read_field (uint8_t cs, uint8_t address, uint8_t MSB_loc, uint8_t numbits)
| 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. More...
long | get_LTC6945_SPI_FIELD (uint8_t cs, uint8_t f)
| 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. More...
void | LTC6945_write (uint8_t cs, uint8_t address, uint8_t Data)
| LTC6945 Write Single Address writes 8 bit Data field to LTC6945. More...
uint8_t | LTC6945_write_field (uint8_t cs, long field_data, uint8_t address, uint8_t MSB_loc, uint8_t numbits)
| 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. More...
uint8_t | get_LTC6945_REGSIZE ()
| returns # of addresses in parts register map (array size) More...
uint8_t | get_LTC6945_SPI_FIELD_NUMBITS (uint8_t f)
| returns the number of bits for a given field name in the SPI map More...
uint8_t | get_LTC6945_SPI_FIELD_RW (uint8_t f)
| returns if the given field name is (0)read/write or (1)read_only field More...
void | set_LTC6945_SPI_FIELD (uint8_t cs, uint8_t f, long field_data)
| 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. More...
void | set_LTC6945_ALLREGS (uint8_t cs, uint8_t reg01, uint8_t reg02, uint8_t reg03, uint8_t reg04, uint8_t reg05, uint8_t reg06, uint8_t reg07, uint8_t reg08, uint8_t reg09, uint8_t reg0A)
| Writes values to ALL LTC6945 RW addresses. More...
void | LTC6945_init ()
| 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) More...
void | set_LTC6945_global_fref (unsigned long fref_MHz, unsigned long fref_Hz)
| sets globals LTC6945_Fref_MHz and LTC6945_Fref_Hz More...
void | set_LTC6945_global_frf (unsigned long frf_MHz, unsigned long frf_Hz)
| sets globals LTC6945_Frf_MHz and LTC6945_Frf_Hz More...
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)
| sets globals LTC6945_VCO_Max_Freq_MHz, LTC6945_VCO_Max_Freq_Hz, LTC6945_VCO_Min_Freq_MHz and LTC6945_VCO_Min_Freq_Hz More...
unsigned long | get_LTC6945_global_fref_MHz ()
| returns global LTC6945_Fref_MHz More...
unsigned long | get_LTC6945_global_fref_Hz ()
| returns global LTC6945_Fref_Hz More...
unsigned long | get_LTC6945_global_frf_MHz ()
| returns global LTC6945_Frf_MHz More...
unsigned long | get_LTC6945_global_frf_Hz ()
| returns global LTC6945_Frf_Hz More...
unsigned long | get_LTC6945_global_VCO_MAX_MHz ()
| returns global LTC6945_VCO_Max_Freq_MHz More...
unsigned long | get_LTC6945_global_VCO_MIN_MHz ()
| returns global LTC6945_VCO_Min_Freq_MHz More...
unsigned long | get_LTC6945_global_VCO_MAX_Hz ()
| returns global LTC6945_VCO_Max_Freq_Hz More...
unsigned long | get_LTC6945_global_VCO_MIN_Hz ()
| returns global LTC6945_VCO_Min_Freq_Hz More...
unsigned long | LTC6945_calc_odiv (unsigned long frf[2])
| calculates the output divider setting based on the frf and on board VCO frequencies of LTC6945 More...
void | LTC6945_set_frf ()
| FUNCTION: LTC6945_set_frf Calculates the integer (N), fractional (NUM) and output divider (OD) SPI values using self created 64bit math functions. More...
void | prt (unsigned long an[])
| Prints HEX representation of 64 bit an. More...
void | init64 (unsigned long an[], unsigned long bigPart, unsigned long littlePart)
| Creates a equivalent 64 bit number from 2 32 bit numbers. More...
void | HZto64 (unsigned long an[], unsigned long MHzPart, unsigned long HzPart)
| create a 64 bit Hz number from 32 bit xxxx MHz number and 32 bit yyy yyy Hz number. More...
void | shl64 (unsigned long an[])
| Single Bit shift left of equivalent 64 bit number (an[] = an[]<<1) More...
void | shr64 (unsigned long an[])
| Single Bit shift right of equivalent 64 bit number (an[] = an[]<<1) More...
void | shl64by (unsigned long an[], uint8_t shiftnum)
| Multi Bit shift left of equivalent 64 bit number (an[] = an[]<<shiftnum) More...
void | shr64by (unsigned long an[], uint8_t shiftnum)
| Multi Bit shift right of equivalent 64 bit number (an[] = an[]>>shiftnum) More...
void | add64 (unsigned long an[], unsigned long ann[])
| 64 bit Add ann to an (an[] = an[] + ann[]) More...
void | sub64 (unsigned long an[], unsigned long ann[])
| 64 bit Subtract ann from an (an[] = an[] - ann[]) More...
boolean | eq64 (unsigned long an[], unsigned long ann[])
| 64 bit, if an == ann, then true More...
boolean | lt64 (unsigned long an[], unsigned long ann[])
| 64 bit, if an < ann, then true More...
void | div64 (unsigned long num[], unsigned long den[])
| 64 bit Divide, num=num/div More...
void | mul64 (unsigned long an[], unsigned long ann[])
| 64 bit multiply, an=an*ann More...

## Variables
uint8_t | LTC6945_reg [LTC6945_NUM_REGADDR]
| number of LTC6945 spi addresses More...
uint8_t | LTC6945_spi_map [(LTC6945_NUM_REGFIELD+1)][4]
| LTC6945 spi map, stores MSB address location, MSB bit location, field length in bits, and R or RW capability. More...
unsigned long | LTC6945_Fref_MHz = 100
| Default Fref frequency - MHz portion (xxx); Fref = xxx, yyy,yyy. More...
unsigned long | LTC6945_Fref_Hz = 0
| Default Fref frequency - Hz portion (yyy,yyy); Fref = x,xxx, yyy,yyy. More...
unsigned long | LTC6945_Frf_MHz = 914
| Default Frf frequency - MHz portion (xxxx); Frf = x,xxx, yyy,yyy. More...
unsigned long | LTC6945_Frf_Hz = 0
| Default Frf frequency - Hz portion (yyy,yyy); Frf = x,xxx, yyy,yyy. More...
unsigned long | LTC6945_VCO_Max_Freq_MHz = 928
| Max Vco frequency for default on board VCO - MHz portion (xxxx); Fvco max = xxx, yyy,yyy. More...
unsigned long | LTC6945_VCO_Min_Freq_MHz = 902
| Min Vco frequency for default on board VCO - MHz portion (xxxx); Fvco min = x,xxx, yyy,yyy. More...
unsigned long | LTC6945_VCO_Max_Freq_Hz = 0
| Max Vco frequency for default on board VCO - Hz portion (yyy,yyy); Fvco max = x,xxx, yyy,yyy. More...
unsigned long | LTC6945_VCO_Min_Freq_Hz = 0
| Min Vco frequency for default on board VCO - Hz portion (yyy,yyy); Fvco min= x,xxx, yyy,yyy. More...
unsigned long | zero64 [] = {0,0}
| for 64bit math functions More...

## Function Documentation

## ◆ add64()

void add64 | ( | unsigned long | an[],
|  | unsigned long | ann[]
| ) |  |

64 bit Add ann to an (an[] = an[] + ann[])

Returns
  void

Parameters

  an | 64 bit number, in 1x2 32bit array
  ann | 64 bit number, in 1x2 32bit array

Definition at line 810 of file LTC6945.cpp.

## ◆ div64()

void div64 | ( | unsigned long | num[],
|  | unsigned long | den[]
| ) |  |

64 bit Divide, num=num/div

Returns
  void

Parameters

  num | numerator: 64 bit number, in 1x2 32bit array
  den | denominator: 64 bit number, in 1x2 32bit array

Definition at line 859 of file LTC6945.cpp.

## ◆ eq64()

boolean eq64 | ( | unsigned long | an[],
|  | unsigned long | ann[]
| ) |  |

64 bit, if an == ann, then true

Returns
  true, if an==ann; false, if an<>ann

Parameters

  an | 64 bit number, in 1x2 32bit array
  ann | 64 bit number, in 1x2 32bit array

Definition at line 838 of file LTC6945.cpp.

## ◆ get_LTC6945_global_fref_Hz()

unsigned long get_LTC6945_global_fref_Hz | ( |  | ) |

returns global LTC6945_Fref_Hz

Returns
  LTC6945_Fref_Hz

Definition at line 467 of file LTC6945.cpp.

## ◆ get_LTC6945_global_fref_MHz()

unsigned long get_LTC6945_global_fref_MHz | ( |  | ) |

returns global LTC6945_Fref_MHz

Returns
  LTC6945_Fref_MHz

Definition at line 462 of file LTC6945.cpp.

## ◆ get_LTC6945_global_frf_Hz()

unsigned long get_LTC6945_global_frf_Hz | ( |  | ) |

returns global LTC6945_Frf_Hz

Returns
  LTC6945_Frf_Hz

Definition at line 477 of file LTC6945.cpp.

## ◆ get_LTC6945_global_frf_MHz()

unsigned long get_LTC6945_global_frf_MHz | ( |  | ) |

returns global LTC6945_Frf_MHz

Returns
  LTC6945_Frf_MHz

Definition at line 472 of file LTC6945.cpp.

## ◆ get_LTC6945_global_VCO_MAX_Hz()

unsigned long get_LTC6945_global_VCO_MAX_Hz | ( |  | ) |

returns global LTC6945_VCO_Max_Freq_Hz

Returns
  LTC6945_VCO_Max_Freq_Hz

Definition at line 492 of file LTC6945.cpp.

## ◆ get_LTC6945_global_VCO_MAX_MHz()

unsigned long get_LTC6945_global_VCO_MAX_MHz | ( |  | ) |

returns global LTC6945_VCO_Max_Freq_MHz

Returns
  LTC6945_VCO_Max_Freq_MHz

Definition at line 482 of file LTC6945.cpp.

## ◆ get_LTC6945_global_VCO_MIN_Hz()

unsigned long get_LTC6945_global_VCO_MIN_Hz | ( |  | ) |

returns global LTC6945_VCO_Min_Freq_Hz

Returns
  LTC6945_VCO_Min_Freq_Hz

Definition at line 497 of file LTC6945.cpp.

## ◆ get_LTC6945_global_VCO_MIN_MHz()

unsigned long get_LTC6945_global_VCO_MIN_MHz | ( |  | ) |

returns global LTC6945_VCO_Min_Freq_MHz

Returns
  LTC6945_VCO_Min_Freq_MHz

Definition at line 487 of file LTC6945.cpp.

## ◆ get_LTC6945_REGSIZE()

uint8_t get_LTC6945_REGSIZE | ( |  | ) |

returns # of addresses in parts register map (array size)

Returns
  # of addresses in parts register map

Definition at line 241 of file LTC6945.cpp.

## ◆ get_LTC6945_SPI_FIELD()

long get_LTC6945_SPI_FIELD | ( | uint8_t | cs,
|  | uint8_t | f
| ) |  |

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.

Returns
  data that was read from field

Parameters

  cs | Chip Select Pin
  f | SPI field number

Definition at line 163 of file LTC6945.cpp.

## ◆ get_LTC6945_SPI_FIELD_NUMBITS()

uint8_t get_LTC6945_SPI_FIELD_NUMBITS | ( | uint8_t | f | ) |

returns the number of bits for a given field name in the SPI map

Returns
  the number of bits for a given field name in the SPI map

Parameters

  f | SPI field number

Definition at line 251 of file LTC6945.cpp.

## ◆ get_LTC6945_SPI_FIELD_RW()

uint8_t get_LTC6945_SPI_FIELD_RW | ( | uint8_t | f | ) |

returns if the given field name is (0)read/write or (1)read_only field

Returns
  if the given field is a (0)read/write or (1)read_only field

Parameters

  f | SPI field number

Definition at line 261 of file LTC6945.cpp.

## ◆ HZto64()

void HZto64 | ( | unsigned long | an[],
|  | unsigned long | MHzPart,
|  | unsigned long | HzPart
| ) |  |

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
  Returns
    void

Parameters

  an | 64 bit number, 1x2 32 bit array
  MHzPart | integer in MHZ
  HzPart | integer in Hz

Definition at line 729 of file LTC6945.cpp.

## ◆ init64()

void init64 | ( | unsigned long | an[],
|  | unsigned long | bigPart,
|  | unsigned long | littlePart
| ) |  |

Creates a equivalent 64 bit number from 2 32 bit numbers.

- an[0]=bigPart upper 32 bits
- an[1]=littlePart lower 32 bits
  Returns
    void

Parameters

  an | 64 bit number, 1x2 32 bit array
  bigPart | upper 32 bits
  littlePart | lower 32 bits

Definition at line 712 of file LTC6945.cpp.

## ◆ lt64()

boolean lt64 | ( | unsigned long | an[],
|  | unsigned long | ann[]
| ) |  |

64 bit, if an < ann, then true

Returns
  true, if an<ann; false, if an=>ann

Parameters

  an | 64 bit number, in 1x2 32bit array
  ann | 64 bit number, in 1x2 32bit array

Definition at line 848 of file LTC6945.cpp.

## ◆ LTC6945_calc_odiv()

unsigned long LTC6945_calc_odiv | ( | unsigned long | frf[2] | ) |

calculates the output divider setting based on the frf and on board VCO frequencies of LTC6945

Returns
  odiv = 1-6 divider setting for valid frequency, or 999 for invalid frequency

Parameters

  frf | output frequency

Definition at line 508 of file LTC6945.cpp.

## ◆ LTC6945_init()

void LTC6945_init | ( |  | ) |

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)

Returns
  void

Definition at line 308 of file LTC6945.cpp.

## ◆ LTC6945_read()

uint8_t LTC6945_read | ( | uint8_t | cs,
|  | int8_t | address
| ) |  |

LTC6945 Read Single Address reads 8 bit Data field to LTC6945.

has to shift data by one bit to account for RW bit

Returns
  data that was read from address

Parameters

  cs | Chip Select Pin
  address | Register address for the LTC6945.

Definition at line 107 of file LTC6945.cpp.

## ◆ LTC6945_read_field()

long LTC6945_read_field | ( | uint8_t | cs,
|  | uint8_t | address,
|  | uint8_t | MSB_loc,
|  | uint8_t | numbits
| ) |  |

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.

Returns
  data that was read from field

Parameters

  cs | Chip Select Pin
  address | Register address for the LTC6945.
  MSB_loc | MSB bit location of field
  numbits | length of field (i.e. number of bits in field)

Definition at line 127 of file LTC6945.cpp.

## ◆ LTC6945_set_frf()

void LTC6945_set_frf | ( |  | ) |

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

Returns
  void

Definition at line 583 of file LTC6945.cpp.

## ◆ LTC6945_write()

void LTC6945_write | ( | uint8_t | cs,
|  | uint8_t | address,
|  | uint8_t | Data
| ) |  |

LTC6945 Write Single Address writes 8 bit Data field to LTC6945.

has to shift data by one bit to account for RW bit

Returns
  void

Parameters

  cs | Chip Select Pin
  address | Register address for the LTC6945.
  Data | 8-bit data to be written to register

Definition at line 174 of file LTC6945.cpp.

## ◆ LTC6945_write_field()

uint8_t LTC6945_write_field | ( | uint8_t | cs,
|  | long | field_data,
|  | uint8_t | address,
|  | uint8_t | MSB_loc,
|  | uint8_t | numbits
| ) |  |

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.

Returns
  void

Parameters

  cs | Chip Select Pin
  field_data | Value field value to be set to
  address | Register address for the LTC6945.
  MSB_loc | MSB bit location of field
  numbits | length of field (i.e. number of bits in field)

Definition at line 190 of file LTC6945.cpp.

## ◆ mul64()

void mul64 | ( | unsigned long | an[],
|  | unsigned long | ann[]
| ) |  |

64 bit multiply, an=an*ann

Returns
  void

Parameters

  an | 64 bit number, in 1x2 32bit array
  ann | 64 bit number, in 1x2 32bit array

Definition at line 906 of file LTC6945.cpp.

## ◆ prt()

void prt | ( | unsigned long | an[] | ) |

Prints HEX representation of 64 bit an.

Returns
  void

Parameters

  an | 64 bit number, in 1x2 32bit array

Definition at line 698 of file LTC6945.cpp.

## ◆ set_LTC6945_ALLREGS()

void set_LTC6945_ALLREGS | ( | uint8_t | cs,
|  | uint8_t | reg01,
|  | uint8_t | reg02,
|  | uint8_t | reg03,
|  | uint8_t | reg04,
|  | uint8_t | reg05,
|  | uint8_t | reg06,
|  | uint8_t | reg07,
|  | uint8_t | reg08,
|  | uint8_t | reg09,
|  | uint8_t | reg0A
| ) |  |

Writes values to ALL LTC6945 RW addresses.

Returns
  void

Parameters

  cs | Chip Select Pin
  reg01 | LTC6945 register 1
  reg02 | LTC6945 register 2
  reg03 | LTC6945 register 3
  reg04 | LTC6945 register 4
  reg05 | LTC6945 register 5
  reg06 | LTC6945 register 6
  reg07 | LTC6945 register 7
  reg08 | LTC6945 register 8
  reg09 | LTC6945 register 9
  reg0A | LTC6945 register 10

Definition at line 284 of file LTC6945.cpp.

## ◆ set_LTC6945_global_fref()

void set_LTC6945_global_fref | ( | unsigned long | fref_MHz,
|  | unsigned long | fref_Hz
| ) |  |

sets globals LTC6945_Fref_MHz and LTC6945_Fref_Hz

Returns
  void

Definition at line 440 of file LTC6945.cpp.

## ◆ set_LTC6945_global_frf()

void set_LTC6945_global_frf | ( | unsigned long | frf_MHz,
|  | unsigned long | frf_Hz
| ) |  |

sets globals LTC6945_Frf_MHz and LTC6945_Frf_Hz

Returns
  void

Definition at line 446 of file LTC6945.cpp.

## ◆ set_LTC6945_global_vcolim()

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
| ) |  |

sets globals LTC6945_VCO_Max_Freq_MHz, LTC6945_VCO_Max_Freq_Hz, LTC6945_VCO_Min_Freq_MHz and LTC6945_VCO_Min_Freq_Hz

Returns
  void

Definition at line 452 of file LTC6945.cpp.

## ◆ set_LTC6945_SPI_FIELD()

void set_LTC6945_SPI_FIELD | ( | uint8_t | cs,
|  | uint8_t | f,
|  | long | field_data
| ) |  |

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.

Returns
  void

Parameters

  cs | Chip Select Pin
  f | SPI field number
  field_data | Value field value to be set to

Definition at line 274 of file LTC6945.cpp.

## ◆ shl64()

void shl64 | ( | unsigned long | an[] | ) |

Single Bit shift left of equivalent 64 bit number (an[] = an[]<<1)

Returns
  void

Parameters

  an | an[] = an[]<<1

Definition at line 748 of file LTC6945.cpp.

## ◆ shl64by()

void shl64by | ( | unsigned long | an[],
|  | uint8_t | shiftnum
| ) |  |

Multi Bit shift left of equivalent 64 bit number (an[] = an[]<<shiftnum)

Returns
  void

Parameters

  an | an[] = an[]<<shiftnum
  shiftnum | number of bits to shift left

Definition at line 774 of file LTC6945.cpp.

## ◆ shr64()

void shr64 | ( | unsigned long | an[] | ) |

Single Bit shift right of equivalent 64 bit number (an[] = an[]<<1)

Returns
  void

Parameters

  an | an[] = an[]>>shiftnum

Definition at line 761 of file LTC6945.cpp.

## ◆ shr64by()

void shr64by | ( | unsigned long | an[],
|  | uint8_t | shiftnum
| ) |  |

Multi Bit shift right of equivalent 64 bit number (an[] = an[]>>shiftnum)

Returns
  void

Parameters

  an | an[] = an[]>>shiftnum
  shiftnum | number of bits to shift right

Definition at line 792 of file LTC6945.cpp.

## ◆ sub64()

void sub64 | ( | unsigned long | an[],
|  | unsigned long | ann[]
| ) |  |

64 bit Subtract ann from an (an[] = an[] - ann[])

Returns
  void

Parameters

  an | 64 bit number, in 1x2 32bit array
  ann | 64 bit number, in 1x2 32bit array

Definition at line 823 of file LTC6945.cpp.

## Variable Documentation

## ◆ LTC6945_Fref_Hz

unsigned long LTC6945_Fref_Hz = 0

Default Fref frequency - Hz portion (yyy,yyy); Fref = x,xxx, yyy,yyy.

Definition at line 92 of file LTC6945.cpp.

## ◆ LTC6945_Fref_MHz

unsigned long LTC6945_Fref_MHz = 100

Default Fref frequency - MHz portion (xxx); Fref = xxx, yyy,yyy.

Definition at line 91 of file LTC6945.cpp.

## ◆ LTC6945_Frf_Hz

unsigned long LTC6945_Frf_Hz = 0

Default Frf frequency - Hz portion (yyy,yyy); Frf = x,xxx, yyy,yyy.

Definition at line 94 of file LTC6945.cpp.

## ◆ LTC6945_Frf_MHz

unsigned long LTC6945_Frf_MHz = 914

Default Frf frequency - MHz portion (xxxx); Frf = x,xxx, yyy,yyy.

Definition at line 93 of file LTC6945.cpp.

## ◆ LTC6945_reg

uint8_t LTC6945_reg[LTC6945_NUM_REGADDR]

number of LTC6945 spi addresses

Definition at line 88 of file LTC6945.cpp.

## ◆ LTC6945_spi_map

uint8_t LTC6945_spi_map[(LTC6945_NUM_REGFIELD+1)][4]

LTC6945 spi map, stores MSB address location, MSB bit location, field length in bits, and R or RW capability.

Definition at line 89 of file LTC6945.cpp.

## ◆ LTC6945_VCO_Max_Freq_Hz

unsigned long LTC6945_VCO_Max_Freq_Hz = 0

Max Vco frequency for default on board VCO - Hz portion (yyy,yyy); Fvco max = x,xxx, yyy,yyy.

Definition at line 97 of file LTC6945.cpp.

## ◆ LTC6945_VCO_Max_Freq_MHz

unsigned long LTC6945_VCO_Max_Freq_MHz = 928

Max Vco frequency for default on board VCO - MHz portion (xxxx); Fvco max = xxx, yyy,yyy.

Definition at line 95 of file LTC6945.cpp.

## ◆ LTC6945_VCO_Min_Freq_Hz

unsigned long LTC6945_VCO_Min_Freq_Hz = 0

Min Vco frequency for default on board VCO - Hz portion (yyy,yyy); Fvco min= x,xxx, yyy,yyy.

Definition at line 98 of file LTC6945.cpp.

## ◆ LTC6945_VCO_Min_Freq_MHz

unsigned long LTC6945_VCO_Min_Freq_MHz = 902

Min Vco frequency for default on board VCO - MHz portion (xxxx); Fvco min = x,xxx, yyy,yyy.

Definition at line 96 of file LTC6945.cpp.

## ◆ zero64

unsigned long zero64[] = {0,0}

for 64bit math functions

Definition at line 100 of file LTC6945.cpp.