DDS.h File Reference

Containing everything needed for the direct digital synthesis. More...

#include "../Configuration.h"
#include "../Pins/Pins.h"
#include <avr/interrupt.h>
#include <avr/pgmspace.h>

Go to the source code of this file.

Functions
void	InitDDSTimer ()
	Initialize the DDS timer.
void	StartDDSTimer ()
	Start the DDS timer.
void	DisableDDSTimer ()
	Disable the DDS timer.
void	DisableDDS1 ()
	Set the voltage of DDS channel 1 to zero.
void	DisableDDS2 ()
	Set the voltage of DDS channel 2 to zero.

Variables
volatile uint32_t	dds_channel1_increment
	Variable holding the increment value of DDS channel 1.
volatile uint32_t	dds_channel2_increment
	Variable holding the increment value of DDS channel 2.
volatile uint16_t	dds_channel1_waveTable [(1<< DDS_QUANTIZER_BITS)]
	Array holding the waveform that should be created on DDS channel 1.
volatile uint16_t	dds_channel2_waveTable [(1<< DDS_QUANTIZER_BITS)]
	Array holding the waveform that should be created on DDS channel 2.
volatile bool	dds_channel1_enabled
	Variable holding the information if DDS channel 1 is enabled.
volatile bool	dds_channel2_enabled
	Variable holding the information if DDS channel 2 is enabled.
const uint16_t SINE_WAVE_TABLE_12BIT[]	PROGMEM

Detailed Description

Containing everything needed for the direct digital synthesis.

Date

23.12.2020 18:23:27

Author

Markus Scheich

See also

https://www.avrfreaks.net/forum/dds-function-generator-using-atmega328p

https://www.digikey.de/de/articles/the-basics-of-direct-digital-synthesizers-ddss

Function Documentation

InitDDSTimer()

void InitDDSTimer

(

)

Initialize the DDS timer.

This initializes all neccessary registers of the DDS timer and resets the phase accumulators.

Variable Documentation

dds_channel1_increment

volatile uint32_t dds_channel1_increment

extern

Variable holding the increment value of DDS channel 1.

This value depends on the configured frequency of the channel.

dds_channel2_increment

volatile uint32_t dds_channel2_increment

extern

Variable holding the increment value of DDS channel 2.

This value depends on the configured frequency of the channel.

PROGMEM

const uint16_t SAWTOOTH_WAVE_TABLE_12BIT [] PROGMEM

Initial value:

=
{
    0x7FF,0x831,0x863,0x896,0x8C8,0x8FA,0x92B,0x95D,0x98E,0x9C0,0x9F1,0xA21,0xA51,0xA81,0xAB1,0xAE0,
    0xB0F,0xB3D,0xB6A,0xB98,0xBC4,0xBF0,0xC1C,0xC46,0xC71,0xC9A,0xCC3,0xCEB,0xD12,0xD38,0xD5E,0xD83,
    0xDA7,0xDCA,0xDEC,0xE0D,0xE2E,0xE4D,0xE6C,0xE89,0xEA5,0xEC1,0xEDB,0xEF5,0xF0D,0xF24,0xF3A,0xF4F,
    0xF63,0xF75,0xF87,0xF97,0xFA6,0xFB4,0xFC1,0xFCD,0xFD7,0xFE0,0xFE8,0xFEF,0xFF5,0xFF9,0xFFC,0xFFE,
    0xFFF,0xFFE,0xFFC,0xFF9,0xFF5,0xFEF,0xFE8,0xFE0,0xFD7,0xFCD,0xFC1,0xFB4,0xFA6,0xF97,0xF87,0xF75,
    0xF63,0xF4F,0xF3A,0xF24,0xF0D,0xEF5,0xEDB,0xEC1,0xEA5,0xE89,0xE6C,0xE4D,0xE2E,0xE0D,0xDEC,0xDCA,
    0xDA7,0xD83,0xD5E,0xD38,0xD12,0xCEB,0xCC3,0xC9A,0xC71,0xC46,0xC1C,0xBF0,0xBC4,0xB98,0xB6A,0xB3D,
    0xB0F,0xAE0,0xAB1,0xA81,0xA51,0xA21,0x9F1,0x9C0,0x98E,0x95D,0x92B,0x8FA,0x8C8,0x896,0x863,0x831,
    0x7FF,0x7CD,0x79B,0x768,0x736,0x704,0x6D3,0x6A1,0x670,0x63E,0x60D,0x5DD,0x5AD,0x57D,0x54D,0x51E,
    0x4EF,0x4C1,0x494,0x466,0x43A,0x40E,0x3E2,0x3B8,0x38D,0x364,0x33B,0x313,0x2EC,0x2C6,0x2A0,0x27B,
    0x257,0x234,0x212,0x1F1,0x1D0,0x1B1,0x192,0x175,0x159,0x13D,0x123,0x109,0x0F1,0x0DA,0x0C4,0x0AF,
    0x09B,0x089,0x077,0x067,0x058,0x04A,0x03D,0x031,0x027,0x01E,0x016,0x00F,0x009,0x005,0x002,0x000,
    0x000,0x000,0x002,0x005,0x009,0x00F,0x016,0x01E,0x027,0x031,0x03D,0x04A,0x058,0x067,0x077,0x089,
    0x09B,0x0AF,0x0C4,0x0DA,0x0F1,0x109,0x123,0x13D,0x159,0x175,0x192,0x1B1,0x1D0,0x1F1,0x212,0x234,
    0x257,0x27B,0x2A0,0x2C6,0x2EC,0x313,0x33B,0x364,0x38D,0x3B8,0x3E2,0x40E,0x43A,0x466,0x494,0x4C1,
    0x4EF,0x51E,0x54D,0x57D,0x5AD,0x5DD,0x60D,0x63E,0x670,0x6A1,0x6D3,0x704,0x736,0x768,0x79B,0x7CD,
}