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34 lines
868 B
C++
34 lines
868 B
C++
#include <Arduino.h>
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#include "teensy-speaker.h"
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extern int16_t g_volume;
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TeensySpeaker::TeensySpeaker(uint8_t pinNum) : PhysicalSpeaker()
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{
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speakerState = false;
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speakerPin = pinNum;
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pinMode(speakerPin, OUTPUT); // analog speaker output, used as digital volume control
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nextTransitionAt = 0;
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}
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TeensySpeaker::~TeensySpeaker()
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{
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}
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void TeensySpeaker::toggleAtCycle(uint32_t c)
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{
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// FIXME: could tell here if we dropped something - is nextTransitionAt already set? If so, we missed a toggle :(
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nextTransitionAt = c;
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}
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void TeensySpeaker::maintainSpeaker(uint32_t c)
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{
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if (nextTransitionAt && c >= nextTransitionAt) {
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nextTransitionAt = 0;
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speakerState = !speakerState;
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// FIXME: glad it's DAC0 and all, but... how does that relate to the pin passed in the constructor?
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analogWriteDAC0(speakerState ? g_volume : 0); // max: 4095
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}
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}
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