AD9833.c File Reference

#include "AD9833.h"

Go to the source code of this file.

Functions
void	AD9833_write_data (unsigned int data)
unsigned int	AD9833_compose_control_word (unsigned char function_type)
void	AD9833_initialize (unsigned char fmclk)
void	AD9833_set_frequency (unsigned long freq_value, unsigned char frequency_register)
void	AD9833_tuning_frequency (unsigned char tuning_step, unsigned char direction, unsigned char frequency_register)
void	AD9833_set_phase (unsigned long phase_value, unsigned char phase_register)
void	AD9833_set_function (unsigned char function_type)

Variables
unsigned int	K
unsigned int	register_word
unsigned int	tuning_freq

Function Documentation

unsigned int AD9833_compose_control_word

(

unsigned char

function_type

)

This function compose the configuration word to set AD9833 features

Parameters

function_type

is a type of function to activate

Returns

configuration word to activate the functionality required

Note

This is a private function, the user should not use it.

Definition at line 71 of file AD9833.c.

References register_word.

void AD9833_initialize

(

unsigned char

fmclk

)

AD9833 Initialization. This function should be called before using the AD9833 RESET command, write 0 into register FREQ0,FREQ1,PHASE0 and PHASE1 Set sinusoidal waveform, FREQ0 and PHASEO out

Parameters

fmclk

is a master frequency [0...25MHz]

Returns

void

Definition at line 154 of file AD9833.c.

References AD9833_FREQUENCY0_OUT, AD9833_PHASE0_OUT, AD9833_REG0, AD9833_REG1, AD9833_RESET, AD9833_set_frequency(), AD9833_set_function(), AD9833_set_phase(), AD9833_SIN, AD9833_write_data(), K, register_word, and tuning_freq.

void AD9833_set_frequency	(	unsigned long	freq_value,
		unsigned char	frequency_register
	)

This function write the frequency value into FREQ0 or FREQ1 register

Parameters

freq_value	is a frequency [0...12500000Hz]
frequency_register	is the register to write 0,REG0–>REGISTER0 1,REG1–>REGISTER1

Returns

void

Definition at line 178 of file AD9833.c.

References AD9833_compose_control_word(), AD9833_write_data(), K, and tuning_freq.

void AD9833_set_function

(

unsigned char

function_type

)

This function activate features AD9833 waveform generator

Parameters

function_type

is the function to activate 1,SIN–>sinusoidal waveform 2,TRIANGLE–>triangular waveform 3,SQUARE–>square waveform 4,FREQUENCY0_OUT–>FREQ0 register is used in the phase accumulator 5,FREQUENCY1_OUT–>FREQ1 register is used in the phase accumulator 6,PHASE0_OUT–>PHASE0 register data is added to the output of the phase accumulator 7,PHASE1_OUT–>PHASE1 register data is added to the output of the phase accumulator 9,SLEEP_MODE–>DAC powered down and internal clock disabled 10,POWER_ON–>no power down

Returns

void

Definition at line 293 of file AD9833.c.

References AD9833_compose_control_word(), AD9833_FREQUENCY0_OUT, AD9833_FREQUENCY1_OUT, AD9833_PHASE0_OUT, AD9833_PHASE1_OUT, AD9833_POWER_ON, AD9833_SIN, AD9833_SLEEP_MODE, AD9833_SQUARE, AD9833_TRIANGLE, and AD9833_write_data().

void AD9833_set_phase	(	unsigned long	phase_value,
		unsigned char	phase_register
	)

This function write the phase value into PHASE0 or PHASE1 register

Parameters

phase_value	is a phase [0...3600]
phase_register	is the register to write 0,REG0–>REGISTER0 1,REG1–>REGISTER1

Returns

void

Definition at line 264 of file AD9833.c.

References AD9833_write_data().

void AD9833_tuning_frequency	(	unsigned char	tuning_step,
		unsigned char	direction,
		unsigned char	frequency_register
	)

This function increases or decreases the LSB register frequency value of a step bit for a tuning frequency

Parameters

tuning_step	is a step bit [0...255]
direction	is a direction of increases or decreases 0,DOWN–>decrease 1,UP –>increase
frequency_register	is the register to write 0,REG0–>REGISTER0 1,REG1–>REGISTER1

Returns

void

Definition at line 225 of file AD9833.c.

References AD9833_compose_control_word(), AD9833_write_data(), and tuning_freq.

void AD9833_write_data

(

unsigned int

data

)

This function write the data to the SPI bus

Parameters

data	to write to the SPI bus

Returns

void

Note

This is a private function, the user should not use it. Change this function to fit other microcontroller models.

Definition at line 49 of file AD9833.c.

References FSYNC.

Variable Documentation

unsigned int K

Definition at line 41 of file AD9833.c.

unsigned int register_word

Definition at line 42 of file AD9833.c.

unsigned int tuning_freq

Definition at line 43 of file AD9833.c.