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libraries/audio-tools/examples/tests/etc/test-tdm/test-tdm.ino

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+// TDM test using a RP2040 with a CS42448 DAC
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+const AudioInfo info_in(44100, 1, 16);
+const AudioInfo info_out(44100, 8, 16);
+const MusicalNotes notes;
+Vector<SineWaveGenerator<int16_t>> sineWaves{info_out.channels};
+Vector<GeneratedSoundStream<int16_t>> sound{info_out.channels};
+InputMerge<int16_t> imerge;  // merge to 8 channels
+DriverPins dac_pins;
+AudioBoard board(AudioDriverCS42448, dac_pins);
+AudioBoardStream tdm(board); 
+StreamCopy copier(tdm, imerge);
+
+// we use the AudioBoard API to set up the pins for the DAC
+void setupDACPins() {
+  // add i2c codec pins: scl, sda, port
+  dac_pins.addI2C(PinFunction::CODEC, 4, 5);
+  // add i2s pins: mclk, bck, ws,data_out, data_in ,(port)
+  dac_pins.addI2S(PinFunction::CODEC,-1, 3, 4, 5, -1);
+}
+
+// Arduino Setup
+void setup(void) {
+  // Open Serial
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup input sound and merge -> we get an merge with 8 channels
+  for (int j = 0; j < info_out.channels; j++) {
+    // use a different tone for each channel
+    sineWaves[j].begin(info_in, notes.frequency(j * 2));
+    // setup GeneratedSoundStream 
+    sound[j].setInput(sineWaves[j]);
+    sound[j].begin(info_in);
+    // setup merge input stream channels
+    imerge.add(sound[j], 1);
+  }
+
+  // setup DAC pins
+  setupDACPins();
+
+  // setup DAC & I2S
+  auto cfg = tdm.defaultConfig();
+  cfg.copyFrom(info_out);
+  cfg.input_device = ADC_INPUT_NONE;
+  cfg.output_device = DAC_OUTPUT_ALL;
+  cfg.signal_type = TDM;
+  tdm.begin();
+
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out
+void loop() { copier.copy(); }