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