first commit
This commit is contained in:
nick6x
commit
5dd3c9df92
|
|
@ -0,0 +1,10 @@
|
|||
name=DDS
|
||||
version=1.0.2
|
||||
author=Morgan Redfield <morgan@enhancedradio.com>, Casey Halverson <casey@enhancedradio.com>
|
||||
maintainer=Morgan Redfield <morgan@enhancedradio.com>
|
||||
sentence=A library for use with HamShield by Enhanced Radio Devices.
|
||||
paragraph=
|
||||
category=Device Control
|
||||
url=http://www.hamshield.com
|
||||
architectures=*
|
||||
includes=DDS.h
|
||||
|
|
@ -0,0 +1,175 @@
|
|||
#include <Arduino.h>
|
||||
#include "DDS.h"
|
||||
|
||||
// To start the DDS, we use Timer1, set to the reference clock
|
||||
// We use Timer2 for the PWM output, running as fast as feasible
|
||||
void DDS::start() {
|
||||
// Use the clkIO clock rate
|
||||
ASSR &= ~(_BV(EXCLK) | _BV(AS2));
|
||||
|
||||
// First, the timer for the PWM output
|
||||
// Setup the timer to use OC2B (pin 3) in fast PWM mode with a configurable top
|
||||
// Run it without the prescaler
|
||||
#ifdef DDS_PWM_PIN_3
|
||||
TCCR2A = (TCCR2A | _BV(COM2B1)) & ~(_BV(COM2B0) | _BV(COM2A1) | _BV(COM2A0)) |
|
||||
_BV(WGM21) | _BV(WGM20);
|
||||
TCCR2B = (TCCR2B & ~(_BV(CS22) | _BV(CS21))) | _BV(CS20) | _BV(WGM22);
|
||||
#else
|
||||
// Alternatively, use pin 11
|
||||
// Enable output compare on OC2A, toggle mode
|
||||
TCCR2A = _BV(COM2A1) | _BV(WGM21) | _BV(WGM20);
|
||||
//TCCR2A = (TCCR2A | _BV(COM2A1)) & ~(_BV(COM2A0) | _BV(COM2B1) | _BV(COM2B0)) |
|
||||
// _BV(WGM21) | _BV(WGM20);
|
||||
TCCR2B = _BV(CS20);
|
||||
#endif
|
||||
|
||||
// Set the top limit, which will be our duty cycle accuracy.
|
||||
// Setting Comparator Bits smaller will allow for higher frequency PWM,
|
||||
// with the loss of resolution.
|
||||
#ifdef DDS_PWM_PIN_3
|
||||
OCR2A = pow(2,COMPARATOR_BITS)-1;
|
||||
OCR2B = 0;
|
||||
#else
|
||||
OCR2A = 0;
|
||||
#endif
|
||||
|
||||
#ifdef DDS_USE_ONLY_TIMER2
|
||||
TIMSK2 |= _BV(TOIE2);
|
||||
#endif
|
||||
|
||||
// Second, setup Timer1 to trigger the ADC interrupt
|
||||
// This lets us use decoding functions that run at the same reference
|
||||
// clock as the DDS.
|
||||
// We use ICR1 as TOP and prescale by 8
|
||||
TCCR1B = _BV(CS10) | _BV(WGM13) | _BV(WGM12);
|
||||
TCCR1A = 0;
|
||||
ICR1 = ((F_CPU / 1) / refclk) - 1;
|
||||
#ifdef DDS_DEBUG_SERIAL
|
||||
Serial.print(F("DDS SysClk: "));
|
||||
Serial.println(F_CPU/8);
|
||||
Serial.print(F("DDS RefClk: "));
|
||||
Serial.println(refclk, DEC);
|
||||
Serial.print(F("DDS ICR1: "));
|
||||
Serial.println(ICR1, DEC);
|
||||
#endif
|
||||
|
||||
// Configure the ADC here to automatically run and be triggered off Timer1
|
||||
ADMUX = _BV(REFS0) | _BV(ADLAR) | 0; // Channel 0, shift result left (ADCH used)
|
||||
DDRC &= ~_BV(0);
|
||||
PORTC &= ~_BV(0);
|
||||
DIDR0 |= _BV(0);
|
||||
ADCSRB = _BV(ADTS2) | _BV(ADTS1) | _BV(ADTS0);
|
||||
ADCSRA = _BV(ADEN) | _BV(ADSC) | _BV(ADATE) | _BV(ADIE) | _BV(ADPS2); // | _BV(ADPS0);
|
||||
}
|
||||
|
||||
void DDS::stop() {
|
||||
// TODO: Stop the timers.
|
||||
#ifndef DDS_USE_ONLY_TIMER2
|
||||
TCCR1B = 0;
|
||||
#endif
|
||||
TCCR2B = 0;
|
||||
}
|
||||
|
||||
// Set our current sine wave frequency in Hz
|
||||
ddsAccumulator_t DDS::calcFrequency(unsigned short freq) {
|
||||
// Fo = (M*Fc)/2^N
|
||||
// M = (Fo/Fc)*2^N
|
||||
ddsAccumulator_t newStep;
|
||||
if(refclk == DDS_REFCLK_DEFAULT) {
|
||||
// Try to use precalculated values if possible
|
||||
if(freq == 2200) {
|
||||
newStep = (2200.0 / (DDS_REFCLK_DEFAULT+DDS_REFCLK_OFFSET)) * pow(2,ACCUMULATOR_BITS);
|
||||
} else if (freq == 1200) {
|
||||
newStep = (1200.0 / (DDS_REFCLK_DEFAULT+DDS_REFCLK_OFFSET)) * pow(2,ACCUMULATOR_BITS);
|
||||
} else if(freq == 2400) {
|
||||
newStep = (2400.0 / (DDS_REFCLK_DEFAULT+DDS_REFCLK_OFFSET)) * pow(2,ACCUMULATOR_BITS);
|
||||
} else if (freq == 1500) {
|
||||
newStep = (1500.0 / (DDS_REFCLK_DEFAULT+DDS_REFCLK_OFFSET)) * pow(2,ACCUMULATOR_BITS);
|
||||
} else if (freq == 600) {
|
||||
newStep = (600.0 / (DDS_REFCLK_DEFAULT+DDS_REFCLK_OFFSET)) * pow(2,ACCUMULATOR_BITS);
|
||||
}
|
||||
} else {
|
||||
newStep = pow(2,ACCUMULATOR_BITS)*freq / (refclk+refclkOffset);
|
||||
}
|
||||
return newStep;
|
||||
}
|
||||
|
||||
// Degrees should be between -360 and +360 (others don't make much sense)
|
||||
void DDS::setPhaseDeg(int16_t degrees) {
|
||||
accumulator = degrees * (pow(2,ACCUMULATOR_BITS)/360.0);
|
||||
}
|
||||
void DDS::changePhaseDeg(int16_t degrees) {
|
||||
accumulator += degrees * (pow(2,ACCUMULATOR_BITS)/360.0);
|
||||
}
|
||||
|
||||
// TODO: Clean this up a bit..
|
||||
void DDS::clockTick() {
|
||||
/* if(running) {
|
||||
accumulator += stepRate;
|
||||
OCR2A = getDutyCycle();
|
||||
}
|
||||
return;*/
|
||||
if(running) {
|
||||
accumulator += stepRate;
|
||||
if(timeLimited && tickDuration == 0) {
|
||||
#ifndef DDS_PWM_PIN_3
|
||||
OCR2A = 0;
|
||||
#else
|
||||
#ifdef DDS_IDLE_HIGH
|
||||
// Set the duty cycle to 50%
|
||||
OCR2B = pow(2,COMPARATOR_BITS)/2;
|
||||
#else
|
||||
// Set duty cycle to 0, effectively off
|
||||
OCR2B = 0;
|
||||
#endif
|
||||
#endif
|
||||
running = false;
|
||||
accumulator = 0;
|
||||
} else {
|
||||
#ifdef DDS_PWM_PIN_3
|
||||
OCR2B = getDutyCycle();
|
||||
#else
|
||||
OCR2A = getDutyCycle();
|
||||
#endif
|
||||
}
|
||||
// Reduce our playback duration by one tick
|
||||
tickDuration--;
|
||||
} else {
|
||||
// Hold it low
|
||||
#ifndef DDS_PWM_PIN_3
|
||||
OCR2A = 0;
|
||||
#else
|
||||
#ifdef DDS_IDLE_HIGH
|
||||
// Set the duty cycle to 50%
|
||||
OCR2B = pow(2,COMPARATOR_BITS)/2;
|
||||
#else
|
||||
// Set duty cycle to 0, effectively off
|
||||
OCR2B = 0;
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
uint8_t DDS::getDutyCycle() {
|
||||
#if ACCUMULATOR_BIT_SHIFT >= 24
|
||||
uint16_t phAng;
|
||||
#else
|
||||
uint8_t phAng;
|
||||
#endif
|
||||
if(amplitude == 0) // Shortcut out on no amplitude
|
||||
return 128>>(8-COMPARATOR_BITS);
|
||||
phAng = (accumulator >> ACCUMULATOR_BIT_SHIFT);
|
||||
int8_t position = pgm_read_byte_near(ddsSineTable + phAng); //>>(8-COMPARATOR_BITS);
|
||||
// Apply scaling and return
|
||||
int16_t scaled = position;
|
||||
// output = ((duty * amplitude) / 256) + 128
|
||||
// This keeps amplitudes centered around 50% duty
|
||||
if(amplitude != 255) { // Amplitude is reduced, so do the full math
|
||||
scaled *= amplitude;
|
||||
scaled >>= 8+(8-COMPARATOR_BITS);
|
||||
} else { // Otherwise, only shift for the comparator bits
|
||||
scaled >>= (8-COMPARATOR_BITS);
|
||||
}
|
||||
scaled += 128>>(8-COMPARATOR_BITS);
|
||||
return scaled;
|
||||
}
|
||||
|
|
@ -0,0 +1,228 @@
|
|||
#ifndef _DDS_H_
|
||||
#define _DDS_H_
|
||||
|
||||
#include <avr/pgmspace.h>
|
||||
|
||||
// Use pin 3 for PWM? If not defined, use pin 11
|
||||
// Quality on pin 3 is higher than on 11, as it can be clocked faster
|
||||
// when the COMPARATOR_BITS value is less than 8
|
||||
#define DDS_PWM_PIN_3
|
||||
|
||||
// Normally, we turn on timer2 and timer1, and have ADC sampling as our clock
|
||||
// Define this to only use Timer2, and not start the ADC clock
|
||||
// #define DDS_USE_ONLY_TIMER2
|
||||
|
||||
// Use a short (16 bit) accumulator. Phase accuracy is reduced, but speed
|
||||
// is increased, along with a reduction in memory use.
|
||||
#define SHORT_ACCUMULATOR
|
||||
|
||||
#ifdef SHORT_ACCUMULATOR
|
||||
#define ACCUMULATOR_BITS 16
|
||||
typedef uint16_t ddsAccumulator_t;
|
||||
#else
|
||||
#define ACCUMULATOR_BITS 32
|
||||
typedef uint32_t ddsAccumulator_t;
|
||||
#endif
|
||||
|
||||
// If defined, the timer will idle at 50% duty cycle
|
||||
// This leaves it floating in the centre of the PWM/DAC voltage range
|
||||
#define DDS_IDLE_HIGH
|
||||
|
||||
// Select how fast the PWM is, at the expense of level accuracy.
|
||||
// A faster PWM rate will make for easier filtering of the output wave,
|
||||
// while a slower one will allow for more accurate voltage level outputs,
|
||||
// but will increase the filtering requirements on the output.
|
||||
// 8 = 62.5kHz PWM
|
||||
// 7 = 125kHz PWM
|
||||
// 6 = 250kHz PWM
|
||||
#ifdef DDS_PWM_PIN_3
|
||||
#define COMPARATOR_BITS 6
|
||||
#else // When using pin 11, we always want 8 bits
|
||||
#define COMPARATOR_BITS 8
|
||||
#endif
|
||||
|
||||
// This is how often we'll perform a phase advance, as well as ADC sampling
|
||||
// rate. The higher this value, the smoother the output wave will be, at the
|
||||
// expense of CPU time. It maxes out around 62000 (TBD)
|
||||
// May be overridden in the sketch to improve performance
|
||||
#ifndef DDS_REFCLK_DEFAULT
|
||||
#define DDS_REFCLK_DEFAULT 9600
|
||||
#endif
|
||||
// As each Arduino crystal is a little different, this can be fine tuned to
|
||||
// provide more accurate frequencies. Adjustments in the range of hundreds
|
||||
// is a good start.
|
||||
#ifndef DDS_REFCLK_OFFSET
|
||||
#define DDS_REFCLK_OFFSET 0
|
||||
#endif
|
||||
|
||||
#ifdef DDS_USE_ONLY_TIMER2
|
||||
// TODO: Figure out where this clock value is generated from
|
||||
#define DDS_REFCLK_DEFAULT (62500/4)
|
||||
#endif
|
||||
|
||||
// Output some of the calculations and information about the DDS over serial
|
||||
//#define DDS_DEBUG_SERIAL
|
||||
|
||||
// When defined, use the 1024 element sine lookup table. This improves phase
|
||||
// accuracy, at the cost of more flash and CPU requirements.
|
||||
// #define DDS_TABLE_LARGE
|
||||
|
||||
#ifdef DDS_TABLE_LARGE
|
||||
// How many bits to keep from the accumulator to look up in this table
|
||||
#define ACCUMULATOR_BIT_SHIFT (ACCUMULATOR_BITS-10)
|
||||
static const int8_t ddsSineTable[1024] PROGMEM = {
|
||||
0, 0, 1, 2, 3, 3, 4, 5, 6, 7, 7, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 23, 24,
|
||||
24, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 33, 33, 34, 35, 36, 36, 37, 38, 39, 39, 40, 41, 42, 42, 43, 44, 44, 45, 46, 47, 47,
|
||||
48, 49, 50, 50, 51, 52, 52, 53, 54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 63, 63, 64, 65, 65, 66, 67, 67, 68, 69, 69,
|
||||
70, 71, 71, 72, 73, 73, 74, 75, 75, 76, 76, 77, 78, 78, 79, 79, 80, 81, 81, 82, 82, 83, 84, 84, 85, 85, 86, 87, 87, 88, 88, 89,
|
||||
89, 90, 90, 91, 91, 92, 93, 93, 94, 94, 95, 95, 96, 96, 97, 97, 98, 98, 99, 99, 100, 100, 101, 101, 102, 102, 102, 103, 103, 104, 104, 105,
|
||||
105, 106, 106, 106, 107, 107, 108, 108, 108, 109, 109, 110, 110, 110, 111, 111, 112, 112, 112, 113, 113, 113, 114, 114, 114, 115, 115, 115, 116, 116, 116, 117,
|
||||
117, 117, 117, 118, 118, 118, 119, 119, 119, 119, 120, 120, 120, 120, 121, 121, 121, 121, 121, 122, 122, 122, 122, 123, 123, 123, 123, 123, 123, 124, 124, 124,
|
||||
124, 124, 124, 124, 125, 125, 125, 125, 125, 125, 125, 125, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126,
|
||||
127, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 126, 125, 125, 125, 125, 125, 125, 125, 125, 124, 124, 124,
|
||||
124, 124, 124, 124, 123, 123, 123, 123, 123, 123, 122, 122, 122, 122, 121, 121, 121, 121, 121, 120, 120, 120, 120, 119, 119, 119, 119, 118, 118, 118, 117, 117,
|
||||
117, 117, 116, 116, 116, 115, 115, 115, 114, 114, 114, 113, 113, 113, 112, 112, 112, 111, 111, 110, 110, 110, 109, 109, 108, 108, 108, 107, 107, 106, 106, 106,
|
||||
105, 105, 104, 104, 103, 103, 102, 102, 102, 101, 101, 100, 100, 99, 99, 98, 98, 97, 97, 96, 96, 95, 95, 94, 94, 93, 93, 92, 91, 91, 90, 90,
|
||||
89, 89, 88, 88, 87, 87, 86, 85, 85, 84, 84, 83, 82, 82, 81, 81, 80, 79, 79, 78, 78, 77, 76, 76, 75, 75, 74, 73, 73, 72, 71, 71,
|
||||
70, 69, 69, 68, 67, 67, 66, 65, 65, 64, 63, 63, 62, 61, 61, 60, 59, 59, 58, 57, 57, 56, 55, 55, 54, 53, 52, 52, 51, 50, 50, 49,
|
||||
48, 47, 47, 46, 45, 44, 44, 43, 42, 42, 41, 40, 39, 39, 38, 37, 36, 36, 35, 34, 33, 33, 32, 31, 30, 30, 29, 28, 27, 27, 26, 25,
|
||||
24, 24, 23, 22, 21, 20, 20, 19, 18, 17, 17, 16, 15, 14, 13, 13, 12, 11, 10, 10, 9, 8, 7, 7, 6, 5, 4, 3, 3, 2, 1, 0,
|
||||
0, 0, -1, -2, -3, -3, -4, -5, -6, -7, -7, -8, -9, -10, -10, -11, -12, -13, -13, -14, -15, -16, -17, -17, -18, -19, -20, -20, -21, -22, -23, -24,
|
||||
-24, -25, -26, -27, -27, -28, -29, -30, -30, -31, -32, -33, -33, -34, -35, -36, -36, -37, -38, -39, -39, -40, -41, -42, -42, -43, -44, -44, -45, -46, -47, -47,
|
||||
-48, -49, -50, -50, -51, -52, -52, -53, -54, -55, -55, -56, -57, -57, -58, -59, -59, -60, -61, -61, -62, -63, -63, -64, -65, -65, -66, -67, -67, -68, -69, -69,
|
||||
-70, -71, -71, -72, -73, -73, -74, -75, -75, -76, -76, -77, -78, -78, -79, -79, -80, -81, -81, -82, -82, -83, -84, -84, -85, -85, -86, -87, -87, -88, -88, -89,
|
||||
-89, -90, -90, -91, -91, -92, -93, -93, -94, -94, -95, -95, -96, -96, -97, -97, -98, -98, -99, -99, -100, -100, -101, -101, -102, -102, -102, -103, -103, -104, -104, -105,
|
||||
-105, -106, -106, -106, -107, -107, -108, -108, -108, -109, -109, -110, -110, -110, -111, -111, -112, -112, -112, -113, -113, -113, -114, -114, -114, -115, -115, -115, -116, -116, -116, -117,
|
||||
-117, -117, -117, -118, -118, -118, -119, -119, -119, -119, -120, -120, -120, -120, -121, -121, -121, -121, -121, -122, -122, -122, -122, -123, -123, -123, -123, -123, -123, -124, -124, -124,
|
||||
-124, -124, -124, -124, -125, -125, -125, -125, -125, -125, -125, -125, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126,
|
||||
-127, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -126, -125, -125, -125, -125, -125, -125, -125, -125, -124, -124, -124,
|
||||
-124, -124, -124, -124, -123, -123, -123, -123, -123, -123, -122, -122, -122, -122, -121, -121, -121, -121, -121, -120, -120, -120, -120, -119, -119, -119, -119, -118, -118, -118, -117, -117,
|
||||
-117, -117, -116, -116, -116, -115, -115, -115, -114, -114, -114, -113, -113, -113, -112, -112, -112, -111, -111, -110, -110, -110, -109, -109, -108, -108, -108, -107, -107, -106, -106, -106,
|
||||
-105, -105, -104, -104, -103, -103, -102, -102, -102, -101, -101, -100, -100, -99, -99, -98, -98, -97, -97, -96, -96, -95, -95, -94, -94, -93, -93, -92, -91, -91, -90, -90,
|
||||
-89, -89, -88, -88, -87, -87, -86, -85, -85, -84, -84, -83, -82, -82, -81, -81, -80, -79, -79, -78, -78, -77, -76, -76, -75, -75, -74, -73, -73, -72, -71, -71,
|
||||
-70, -69, -69, -68, -67, -67, -66, -65, -65, -64, -63, -63, -62, -61, -61, -60, -59, -59, -58, -57, -57, -56, -55, -55, -54, -53, -52, -52, -51, -50, -50, -49,
|
||||
-48, -47, -47, -46, -45, -44, -44, -43, -42, -42, -41, -40, -39, -39, -38, -37, -36, -36, -35, -34, -33, -33, -32, -31, -30, -30, -29, -28, -27, -27, -26, -25,
|
||||
-24, -24, -23, -22, -21, -20, -20, -19, -18, -17, -17, -16, -15, -14, -13, -13, -12, -11, -10, -10, -9, -8, -7, -7, -6, -5, -4, -3, -3, -2, -1, 0
|
||||
};
|
||||
#else
|
||||
#define ACCUMULATOR_BIT_SHIFT (ACCUMULATOR_BITS-8)
|
||||
static const int8_t ddsSineTable[256] PROGMEM = {
|
||||
0, 3, 6, 9, 12, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49,
|
||||
51, 54, 57, 60, 63, 65, 68, 71, 73, 76, 78, 81, 83, 85, 88, 90,
|
||||
92, 94, 96, 98, 100, 102, 104, 106, 107, 109, 111, 112, 113, 115,
|
||||
116, 117, 118, 120, 121, 122, 122, 123, 124, 125, 125, 126, 126,
|
||||
126, 127, 127, 127, 127, 127, 127, 127, 126, 126, 126, 125, 125,
|
||||
124, 123, 122, 122, 121, 120, 118, 117, 116, 115, 113, 112, 111,
|
||||
109, 107, 106, 104, 102, 100, 98, 96, 94, 92, 90, 88, 85, 83, 81,
|
||||
78, 76, 73, 71, 68, 65, 63, 60, 57, 54, 51, 49, 46, 43, 40, 37,
|
||||
34, 31, 28, 25, 22, 19, 16, 12, 9, 6, 3, 0, -3, -6, -9, -12, -16,
|
||||
-19, -22, -25, -28, -31, -34, -37, -40, -43, -46, -49, -51, -54,
|
||||
-57, -60, -63, -65, -68, -71, -73, -76, -78, -81, -83, -85, -88,
|
||||
-90, -92, -94, -96, -98, -100, -102, -104, -106, -107, -109, -111,
|
||||
-112, -113, -115, -116, -117, -118, -120, -121, -122, -122, -123,
|
||||
-124, -125, -125, -126, -126, -126, -127, -127, -127, -127, -127,
|
||||
-127, -127, -126, -126, -126, -125, -125, -124, -123, -122, -122,
|
||||
-121, -120, -118, -117, -116, -115, -113, -112, -111, -109, -107,
|
||||
-106, -104, -102, -100, -98, -96, -94, -92, -90, -88, -85, -83,
|
||||
-81, -78, -76, -73, -71, -68, -65, -63, -60, -57, -54, -51, -49,
|
||||
-46, -43, -40, -37, -34, -31, -28, -25, -22, -19, -16, -12, -9, -6, -3
|
||||
};
|
||||
#endif /* DDS_TABLE_LARGE */
|
||||
|
||||
class DDS {
|
||||
public:
|
||||
DDS(): refclk(DDS_REFCLK_DEFAULT), refclkOffset(DDS_REFCLK_OFFSET),
|
||||
accumulator(0), running(false),
|
||||
timeLimited(false), tickDuration(0), amplitude(255)
|
||||
{};
|
||||
|
||||
// Start all of the timers needed
|
||||
void start();
|
||||
// Is the DDS presently producing a tone?
|
||||
const bool isRunning() { return running; };
|
||||
// Stop the DDS timers
|
||||
void stop();
|
||||
|
||||
// Start and stop the PWM output
|
||||
void on() {
|
||||
timeLimited = false;
|
||||
running = true;
|
||||
}
|
||||
// Provide a duration in ms for the tone
|
||||
void on(unsigned short duration) {
|
||||
// Duration in ticks from milliseconds is:
|
||||
// t = (1/refclk)
|
||||
tickDuration = (unsigned long)((unsigned long)duration * (unsigned long)refclk) / 1000;
|
||||
timeLimited = true;
|
||||
running = true;
|
||||
}
|
||||
void off() {
|
||||
running = false;
|
||||
}
|
||||
|
||||
// Generate a tone for a specific amount of time
|
||||
void play(unsigned short freq, unsigned short duration) {
|
||||
setFrequency(freq);
|
||||
on(duration);
|
||||
}
|
||||
// Blocking version
|
||||
void playWait(unsigned short freq, unsigned short duration) {
|
||||
play(freq, duration);
|
||||
delay(duration);
|
||||
}
|
||||
|
||||
// Use these to get some calculated values for specific frequencies
|
||||
// or to get the current frequency stepping rate.
|
||||
ddsAccumulator_t calcFrequency(unsigned short freq);
|
||||
ddsAccumulator_t getPhaseAdvance() { return stepRate; };
|
||||
|
||||
// Our maximum clock isn't very high, so our highest
|
||||
// frequency supported will fit in a short.
|
||||
void setFrequency(unsigned short freq) { stepRate = calcFrequency(freq); };
|
||||
void setPrecalcFrequency(ddsAccumulator_t freq) { stepRate = freq; };
|
||||
|
||||
// Handle phase shifts
|
||||
void setPhaseDeg(int16_t degrees);
|
||||
void changePhaseDeg(int16_t degrees);
|
||||
|
||||
// Adjustable reference clock. This shoud be done before the timers are
|
||||
// started, or they will need to be restarted. Frequencies will need to
|
||||
// be set again to use the new clock.
|
||||
void setReferenceClock(unsigned long ref) {
|
||||
refclk = ref;
|
||||
}
|
||||
unsigned long getReferenceClock() {
|
||||
return refclk;
|
||||
}
|
||||
|
||||
void setReferenceOffset(int16_t offset) {
|
||||
refclkOffset = offset;
|
||||
}
|
||||
int16_t getReferenceOffset() {
|
||||
return refclkOffset;
|
||||
}
|
||||
|
||||
uint8_t getDutyCycle();
|
||||
|
||||
// Set a scaling factor. To keep things quick, this is a power of 2 value.
|
||||
// Set it with 0 for lowest (which will be off), 8 is highest.
|
||||
void setAmplitude(unsigned char amp) {
|
||||
amplitude = amp;
|
||||
}
|
||||
|
||||
// This is the function called by the ADC_vect ISR to produce the tones
|
||||
void clockTick();
|
||||
|
||||
private:
|
||||
volatile bool running;
|
||||
volatile unsigned long tickDuration;
|
||||
volatile bool timeLimited;
|
||||
volatile unsigned char amplitude;
|
||||
volatile ddsAccumulator_t accumulator;
|
||||
volatile ddsAccumulator_t stepRate;
|
||||
ddsAccumulator_t refclk;
|
||||
int16_t refclkOffset;
|
||||
static DDS *sDDS;
|
||||
};
|
||||
|
||||
#endif /* _DDS_H_ */
|
||||
Loading…
Reference in New Issue