SPUC::nco Class Reference

NCO with 32 bit accumulator. More...

#include <nco.h>

Public Member Functions
	nco (long bits=8)
	Constructor. More...
void	reset ()
	Reset object. More...
void	set_frequency (unsigned long freq)
	Set frequency control word. More...
void	reset_frequency (unsigned long freq)
	Set frequency control word and register for frequency control word. More...
long	get_phase (void)
	Return current phase. More...
void	load (long loop_filter_out)
	Load new frequency control word. More...
long	clock (long loop_filter_out)
	Clock NCO with new frequency control word input. More...
long	clock ()
	Clock NCO without changing frequency control word. More...

Public Attributes
unsigned long	phase

Protected Attributes
unsigned long	acc
unsigned long	fcw
unsigned long	new_fcw
unsigned long	mask_bits

Detailed Description

NCO with 32 bit accumulator.

Numerically controlled oscillator (with 32 bits accumulator) returns the top (mask_bits) MSBs from accumulator Useful for carrier recovery where top bits used for input to sine,cos lookup table. FCW : frequency control word ACC : accumulator Frequency must be set through interface routines set_frequency or reset_frequency. Load routine is to allow frequency to be updated (typically with a loop filter). When not changing frequency call "clock" routine.

Author

Tony Kirke

Constructor & Destructor Documentation

SPUC::nco::nco

(

long

bits = 8

)

Constructor.

References acc, fcw, mask_bits, MASK_NEG_HI, new_fcw, and phase.

Member Function Documentation

long SPUC::nco::clock

(

long

loop_filter_out

)

Clock NCO with new frequency control word input.

References clock(), fcw, and new_fcw.

Here is the call graph for this function:

long SPUC::nco::clock

(

void

)

Clock NCO without changing frequency control word.

References acc, mask_bits, new_fcw, and phase.

Referenced by clock().

long SPUC::nco::get_phase ( void  )

inline

Return current phase.

void SPUC::nco::load ( long  loop_filter_out )

inline

Load new frequency control word.

void SPUC::nco::reset ( void  )

inline

Reset object.

void SPUC::nco::reset_frequency ( unsigned long  freq )

inline

Set frequency control word and register for frequency control word.

void SPUC::nco::set_frequency ( unsigned long  freq )

inline

Set frequency control word.

Member Data Documentation

unsigned long SPUC::nco::acc

protected

Referenced by clock(), and nco().

unsigned long SPUC::nco::fcw

protected

Referenced by clock(), and nco().

unsigned long SPUC::nco::mask_bits

protected

Referenced by clock(), and nco().

unsigned long SPUC::nco::new_fcw

protected

Referenced by clock(), and nco().

unsigned long SPUC::nco::phase

Referenced by clock(), and nco().

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The documentation for this class was generated from the following files:

• nco.h
• nco.cpp