NCO/NCO.c File Reference

#include <NCO.h>
#include <inttypes.h>
#include <avr/interrupt.h>
#include <avr/io.h>
#include "WConstants.h"

Go to the source code of this file.

Defines
#define	nco_dac_toggle_latch   { PORTB&=~(1<<NCO_DAC_LATCH); PORTB|=(1<<NCO_DAC_LATCH);}
	toggles the NB1A DAC latch bit low then high
#define	nco_dac_toggle_load   { PORTB&=~(1<<NCO_DAC_LOAD); PORTB|=(1<<NCO_DAC_LOAD);}
	toggles the NB1A DAC load bit low then high
Functions
void	nco_inc (void)
	Call this function to increment all of the phase accumulators.
void	nco_set_freq (unsigned char ch, double freq)
	Sets the phase increment of an NCO channel.
void	nco_init (void)
	Initializes the NCO structure.
void	nco_update (void)
	Updates all of the NCO channels.
Variables
struct nco_struct	nco [NCO_NUM_CHS-1]

Detailed Description

Definition in file NCO.c.

Function Documentation

void nco_inc

(

void

)

Call this function to increment all of the phase accumulators.

Returns:

VOID

Definition at line 16 of file NCO.c.

void nco_init

(

void

)

Initializes the NCO structure.

Resets the phase accumulator, phase increment and the DAC control bytes. This should be called once at the start of program before calling any other NCO functions or enabling interrupts.

Definition at line 42 of file NCO.c.

void nco_set_freq	(	unsigned char	ch,
		double	freq
	)

Sets the phase increment of an NCO channel.

The value of the frequency must be less than half the sampling rate.

Parameters:

[in]	ch	oscillator channel number (0..3)
[in]	freq	oscillator frequency

Returns:

VOID

Definition at line 31 of file NCO.c.

void nco_update

(

void

)

Updates all of the NCO channels.

This function should be called every time the timer interrupt occurs.

Definition at line 74 of file NCO.c.