aiie/teensy/teensy-speaker.cpp

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#include <Arduino.h>
#include "teensy-speaker.h"
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#include "globals.h"
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TeensySpeaker::TeensySpeaker(uint8_t pinNum) : PhysicalSpeaker()
{
toggleState = false;
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speakerPin = pinNum;
pinMode(speakerPin, OUTPUT); // analog speaker output, used as digital volume control
mixerValue = numMixed = 0;
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}
TeensySpeaker::~TeensySpeaker()
{
}
void TeensySpeaker::toggle(uint32_t c)
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{
toggleState = !toggleState;
mixerValue = (toggleState ? 0x1FF : 0x00);
mixerValue >>= (16-g_volume);
// FIXME: glad it's DAC0 and all, but... how does that relate to the pin passed in the constructor?
analogWriteDAC0(mixerValue);
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}
void TeensySpeaker::maintainSpeaker(uint32_t c, uint64_t runtimeInMicros)
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{
// Nothing to do here. We can't run the speaker async, b/c not
// enough CPU time. So we run the CPU close to sync and hope that
// the direct pulsing of the speaker is reasonably close to on-time.
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}
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void TeensySpeaker::beginMixing()
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{
// unused
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}
void TeensySpeaker::mixOutput(uint8_t v)
{
// unused
}