DDS/examples/SimpleSin/SimpleSin.ino

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/* DDS
* Example: Simple Sin
* This is a simple example that outputs a sin
* wave on pin 3.
*/
#define DDS_REFCLK_DEFAULT 9600
#include <DDS.h>
#define PWM_PIN 3
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#define DDS_USE_ONLY_TIMER2 false
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#define TIMER2_PHASE_ADVANCE 24
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DDS dds;
void setup() {
pinMode(PWM_PIN, OUTPUT);
digitalWrite(PWM_PIN, LOW);
dds.start();
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dds.startPhaseAccumulator(DDS_USE_ONLY_TIMER2);
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dds.playWait(600, 3000);
dds.on();
//dds.setAmplitude(31);
}
void loop() {
dds.setFrequency(2200);
}
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#if DDS_USE_ONLY_TIMER2
ISR(TIMER2_OVF_vect) {
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static unsigned char tcnt = 0;
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if(++tcnt == TIMER2_PHASE_ADVANCE) {
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tcnt = 0;
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dds.clockTick();
}
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}
#else // Use the ADC timer instead
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ISR(ADC_vect) {
if(false){
static unsigned char tcnt = 0;
TIFR1 = _BV(ICF1); // Clear the timer flag
if(++tcnt == 4) {
tcnt = 0;
}
dds.clockTick();
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}
}
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#endif