mirror of https://github.com/JorjBauer/aiie.git
66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
#include <Arduino.h>
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#include "teensy-speaker.h"
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#include "globals.h"
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TeensySpeaker::TeensySpeaker(uint8_t pinNum) : PhysicalSpeaker()
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{
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toggleState = 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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mixerValue = numMixed = 0;
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toggleCount = toggleReadPtr = toggleWritePtr = 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::toggle(uint32_t c)
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{
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toggleTimes[toggleWritePtr] = c;
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if (toggleCount < SPEAKERQUEUESIZE-1) {
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toggleWritePtr++;
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if (toggleWritePtr >= SPEAKERQUEUESIZE)
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toggleWritePtr = 0;
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toggleCount++;
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} else {
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// speaker overflow
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Serial.println("spkr overflow");
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}
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}
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void TeensySpeaker::maintainSpeaker(uint32_t c)
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{
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bool didChange = false;
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while (toggleCount && c >= toggleTimes[toggleReadPtr]) {
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toggleState = !toggleState;
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toggleCount--;
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toggleReadPtr++;
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if (toggleReadPtr >= SPEAKERQUEUESIZE)
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toggleReadPtr = 0;
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didChange = true;
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}
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if (didChange) {
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mixerValue = (toggleState ? 0x1FF : 0x00);
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mixerValue >>= (16-g_volume);
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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(mixerValue);
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}
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}
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void TeensySpeaker::beginMixing()
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{
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// unused
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}
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void TeensySpeaker::mixOutput(uint8_t v)
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{
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// unused
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}
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