35 lines
944 B
C++
35 lines
944 B
C++
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/**
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* We use the default Arduino SPI API to send/write the data as SPI Master.
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* For a sample rate of 44100 with 2 channels and 16 bit data you need to be
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* able to transmit faster then 44100 * 2 channels * 2 bytes = 176400 bytes per
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* second. Using a SPI communication this gives 176400 * 8 =
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* 1'411'200 bps!
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*
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* Untested DRAFT implementation!
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*/
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#include <SPI.h>
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#include "AudioTools.h"
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const size_t BUFFER_SIZE = 1024;
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const int SPI_CLOCK = 2000000; // 2 MHz
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AudioInfo info(44100, 2, 16); //
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Vector<uint8_t> buffer(BUFFER_SIZE);
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SineWaveGenerator<int16_t> sineWave(32000);
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GeneratedSoundStream<int16_t> sound(sineWave);
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void setup() {
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SPI.begin();
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sineWave.begin(info, N_B4);
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SPI.beginTransaction(SPISettings(SPI_CLOCK, MSBFIRST, SPI_MODE0));
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}
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void loop() {
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// get data
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size_t result = sound.readBytes(&buffer[0], buffer.size());
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// transmit data
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SPI.transfer(&buffer[0], result);
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//SPI.endTransaction();
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}
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