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/*
* AD9833.cpp
*
* Copyright 2016 Bill Williams <wlwilliams1952@gmail.com, github/BillWilliams1952>
*
* Thanks to john@vwlowen co uk for his work on the AD9833. His web page
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include "AD9833.h"
/*
* Create an AD9833 object
*/
AD9833 :: AD9833 ( uint8_t FNCpin, uint32_t referenceFrequency ) {
// Pin used to enable SPI communication (active LOW)
#ifdef FNC_PIN
pinMode(FNC_PIN,OUTPUT);
#else
this->FNCpin = FNCpin;
pinMode(FNCpin,OUTPUT);
#endif
WRITE_FNCPIN(HIGH);
/* TODO: The minimum resolution and max frequency are determined by
* by referenceFrequency. We should calculate these values and use
* them during setFrequency. The problem is if the user programs a
* square wave at refFrequency/2, then changes the waveform to sine.
* The sine wave will not have enough points?
*/
refFrequency = referenceFrequency;
// Setup some defaults
DacDisabled = false;
IntClkDisabled = false;
outputEnabled = false;
waveForm0 = waveForm1 = SINE_WAVE;
frequency0 = frequency1 = 1000; // 1 KHz sine wave to start
phase0 = phase1 = 0.0; // 0 phase
activeFreq = REG0; activePhase = REG0;
}
/*
* This MUST be the first command after declaring the AD9833 object
* Start SPI and place the AD9833 in the RESET state
*/
void AD9833 :: Begin ( void ) {
SPI.begin();
delay(100);
Reset(); // Hold in RESET until first WriteRegister command
}
/*
* Setup and apply a signal. phaseInDeg defaults to 0.0 if not supplied.
* phaseReg defaults to value of freqReg if not supplied.
* Note that any previous calls to EnableOut,
* SleepMode, DisableDAC, or DisableInternalClock remain in effect.
*/
void AD9833 :: ApplySignal ( WaveformType waveType,
Registers freqReg, float frequencyInHz,
Registers phaseReg, float phaseInDeg ) {
SetFrequency ( freqReg, frequencyInHz );
SetPhase ( phaseReg, phaseInDeg );
SetWaveform ( freqReg, waveType );
SetOutputSource ( freqReg, phaseReg );
}
/***********************************************************************
Control Register
------------------------------------------------------------------------
D15,D14(MSB) 10 = FREQ1 write, 01 = FREQ0 write,
11 = PHASE write, 00 = control write
D13 If D15,D14 = 00, 0 = individual LSB and MSB FREQ write,
1 = both LSB and MSB FREQ writes consecutively
If D15,D14 = 11, 0 = PHASE0 write, 1 = PHASE1 write
D12 0 = writing LSB independently
1 = writing MSB independently
D11 0 = output FREQ0,
1 = output FREQ1
D10 0 = output PHASE0
1 = output PHASE1
D9 Reserved. Must be 0.
D8 0 = RESET disabled
1 = RESET enabled
D7 0 = internal clock is enabled
1 = internal clock is disabled
D6 0 = onboard DAC is active for sine and triangle wave output,
1 = put DAC to sleep for square wave output
D5 0 = output depends on D1
1 = output is a square wave
D4 Reserved. Must be 0.
D3 0 = square wave of half frequency output
1 = square wave output
D2 Reserved. Must be 0.
D1 If D5 = 1, D1 = 0.
Otherwise 0 = sine output, 1 = triangle output
D0 Reserved. Must be 0.
***********************************************************************/
/*
* Hold the AD9833 in RESET state.
* Resets internal registers to 0, which corresponds to an output of
* midscale - digital output at 0.
*
* The difference between Reset() and EnableOutput(false) is that
* EnableOutput(false) keeps the AD9833 in the RESET state until you
* specifically remove the RESET state using EnableOutput(true).
* With a call to Reset(), ANY subsequent call to ANY function (other
* than Reset itself and Set/IncrementPhase) will also remove the RESET
* state.
*/
void AD9833 :: Reset ( void ) {
WriteRegister(RESET_CMD);
delay(15);
}
/*
* Set the specified frequency register with the frequency (in Hz)
*/
void AD9833 :: SetFrequency ( Registers freqReg, float frequency ) {
// TODO: calculate max frequency based on refFrequency.
// Use the calculations for sanity checks on numbers.
// Sanity check on frequency: Square - refFrequency / 2
// Sine/Triangle - refFrequency / 4
if ( frequency > 12.5e6 ) // TODO: Fix this based on refFreq
frequency = 12.5e6;
if ( frequency < 0.0 ) frequency = 0.0;
// Save frequency for use by IncrementFrequency function
if ( freqReg == REG0 ) frequency0 = frequency;
else frequency1 = frequency;
int32_t freqWord = (frequency * pow2_28) / (float)refFrequency;
int16_t upper14 = (int16_t)((freqWord & 0xFFFC000) >> 14),
lower14 = (int16_t)(freqWord & 0x3FFF);
// Which frequency register are we updating?
uint16_t reg = freqReg == REG0 ? FREQ0_WRITE_REG : FREQ1_WRITE_REG;
lower14 |= reg;
upper14 |= reg;
// I do not reset the registers during write. It seems to remove
// 'glitching' on the outputs.
WriteControlRegister();
// Control register has already been setup to accept two frequency
// writes, one for each 14 bit part of the 28 bit frequency word
WriteRegister(lower14); // Write lower 14 bits to AD9833
WriteRegister(upper14); // Write upper 14 bits to AD9833
}
/*
* Increment the specified frequency register with the frequency (in Hz)
*/
void AD9833 :: IncrementFrequency ( Registers freqReg, float freqIncHz ) {
// Add/subtract a value from the current frequency programmed in
// freqReg by the amount given
float frequency = (freqReg == REG0) ? frequency0 : frequency1;
SetFrequency(freqReg,frequency+freqIncHz);
}
/*
* Set the specified phase register with the phase (in degrees)
* The output signal will be phase shifted by 2π/4096 x PHASEREG
*/
void AD9833 :: SetPhase ( Registers phaseReg, float phaseInDeg ) {
// Sanity checks on input
phaseInDeg = fmod(phaseInDeg,360);
if ( phaseInDeg < 0 ) phaseInDeg += 360;
// Phase is in float degrees ( 0.0 - 360.0 )
// Convert to a number 0 to 4096 where 4096 = 0 by masking
uint16_t phaseVal = (uint16_t)(BITS_PER_DEG * phaseInDeg) & 0x0FFF;
phaseVal |= PHASE_WRITE_CMD;
// Save phase for use by IncrementPhase function
if ( phaseReg == REG0 ) {
phase0 = phaseInDeg;
}
else {
phase1 = phaseInDeg;
phaseVal |= PHASE1_WRITE_REG;
}
WriteRegister(phaseVal);
}
/*
* Increment the specified phase register by the phase (in degrees)
*/
void AD9833 :: IncrementPhase ( Registers phaseReg, float phaseIncDeg ) {
// Add/subtract a value from the current phase programmed in
// phaseReg by the amount given
float phase = (phaseReg == REG0) ? phase0 : phase1;
SetPhase(phaseReg,phase + phaseIncDeg);
}
/*
* Set the type of waveform that is output for a frequency register
* SINE_WAVE, TRIANGLE_WAVE, SQUARE_WAVE, HALF_SQUARE_WAVE
*/
void AD9833 :: SetWaveform ( Registers waveFormReg, WaveformType waveType ) {
// TODO: Add more error checking?
if ( waveFormReg == REG0 )
waveForm0 = waveType;
else
waveForm1 = waveType;
WriteControlRegister();
}
/*
* EnableOutput(false) keeps the AD9833 is RESET state until a call to
* EnableOutput(true). See the Reset function description.
*/
void AD9833 :: EnableOutput ( bool enable ) {
outputEnabled = enable;
WriteControlRegister();
}
/*
* Set which frequency and phase register is being used to output the
* waveform. If phaseReg is not supplied, it defaults to the same
* register as freqReg.
*/
void AD9833 :: SetOutputSource ( Registers freqReg, Registers phaseReg ) {
// TODO: Add more error checking?
activeFreq = freqReg;
if ( phaseReg == SAME_AS_REG0 ) activePhase = activeFreq;
else activePhase = phaseReg;
WriteControlRegister();
}
//---------- LOWER LEVEL FUNCTIONS NOT NORMALLY NEEDED -------------
/*
* Disable/enable both the internal clock and the DAC. Note that square
* wave outputs are avaiable if using an external Reference.
* TODO: ?? IS THIS TRUE ??
*/
void AD9833 :: SleepMode ( bool enable ) {
DacDisabled = enable;
IntClkDisabled = enable;
WriteControlRegister();
}
/*
* Enables / disables the DAC. It will override any previous DAC
* setting by Waveform type, or via the SleepMode function
*/
void AD9833 :: DisableDAC ( bool enable ) {
DacDisabled = enable;
WriteControlRegister();
}
/*
* Enables / disables the internal clock. It will override any
* previous clock setting by the SleepMode function
*/
void AD9833 :: DisableInternalClock ( bool enable ) {
IntClkDisabled = enable;
WriteControlRegister();
}
// ------------ STATUS / INFORMATION FUNCTIONS -------------------
/*
* Return actual frequency programmed
*/
float AD9833 :: GetActualProgrammedFrequency ( Registers reg ) {
float frequency = reg == REG0 ? frequency0 : frequency1;
int32_t freqWord = (uint32_t)((frequency * pow2_28) / (float)refFrequency) & 0x0FFFFFFFUL;
return (float)freqWord * (float)refFrequency / (float)pow2_28;
}
/*
* Return actual phase programmed
*/
float AD9833 :: GetActualProgrammedPhase ( Registers reg ) {
float phase = reg == REG0 ? phase0 : phase1;
uint16_t phaseVal = (uint16_t)(BITS_PER_DEG * phase) & 0x0FFF;
return (float)phaseVal / BITS_PER_DEG;
}
/*
* Return frequency resolution
*/
float AD9833 :: GetResolution ( void ) {
return (float)refFrequency / (float)pow2_28;
}
// --------------------- PRIVATE FUNCTIONS --------------------------
/*
* Write control register. Setup register based on defined states
*/
void AD9833 :: WriteControlRegister ( void ) {
uint16_t waveForm;
// TODO: can speed things up by keeping a writeReg0 and writeReg1
// that presets all bits during the various setup function calls
// rather than setting flags. Then we could just call WriteRegister
// directly.
if ( activeFreq == REG0 ) {
waveForm = waveForm0;
waveForm &= ~FREQ1_OUTPUT_REG;
}
else {
waveForm = waveForm1;
waveForm |= FREQ1_OUTPUT_REG;
}
if ( activePhase == REG0 )
waveForm &= ~PHASE1_OUTPUT_REG;
else
waveForm |= PHASE1_OUTPUT_REG;
if ( outputEnabled )
waveForm &= ~RESET_CMD;
else
waveForm |= RESET_CMD;
if ( DacDisabled )
waveForm |= DISABLE_DAC;
else
waveForm &= ~DISABLE_DAC;
if ( IntClkDisabled )
waveForm |= DISABLE_INT_CLK;
else
waveForm &= ~DISABLE_INT_CLK;
WriteRegister ( waveForm );
}
void AD9833 :: WriteRegister ( int16_t dat ) {
/*
* We set the mode here, because other hardware may be doing SPI also
*/
SPI.setDataMode(SPI_MODE2);
/* Improve overall switching speed
* Note, the times are for this function call, not the write.
* digitalWrite(FNCpin) ~ 17.6 usec
* digitalWriteFast2(FNC_PIN) ~ 8.8 usec
*/
WRITE_FNCPIN(LOW); // FNCpin low to write to AD9833
//delayMicroseconds(2); // Some delay may be needed
// TODO: Are we running at the highest clock rate?
SPI.transfer(highByte(dat)); // Transmit 16 bits 8 bits at a time
SPI.transfer(lowByte(dat));
WRITE_FNCPIN(HIGH); // Write done
}

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