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libraries/audio-tools/examples/examples-communication/usb/adafruit/adafruit.ino

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+#include "AudioTools.h"
+#include "AudioTools/Sandbox/USB/USBDeviceAudioAdafruit.h"
+
+size_t sample_count_mic = 0;
+size_t sample_count_spk = 0;
+
+// Microphone: generate data for USB
+size_t readCB(uint8_t* data, size_t len, USBDeviceAudio& ref) {
+  int16_t* data16 = (int16_t*)data;
+  size_t samples = len / sizeof(int16_t);
+  size_t result = 0;
+  // generate random stereo data
+  for (int j = 0; j < samples; j+=2) {
+    data16[j] = random(-32000, 32000);
+    data16[j+1] = random(-32000, 32000);;
+    result += sizeof(int16_t)*2;
+    sample_count_mic += 2;
+  }
+  return result;
+}
+
+// Speaker: receive data from USB and write them to the final destination
+size_t writeCB(const uint8_t* data, size_t len, USBDeviceAudio & ref) {
+  int16_t* data16 = (int16_t*)data;
+  size_t samples = len / sizeof(int16_t);
+  sample_count_spk += samples;
+  return len;
+}
+
+auto config() {
+  USBAudioConfig result;
+  result.p_read_callback = readCB;
+  result.p_write_callback = writeCB;
+  return result;
+}
+
+USBDeviceAudioAdafruit usb{config()};
+
+void setup() {
+    // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
+  Serial.begin(115200);
+
+  // If already enumerated, additional class driver begin() e.g msc, hid, midi won't take effect until re-enumeration
+  if (TinyUSBDevice.mounted()) {
+    TinyUSBDevice.detach();
+    delay(10);
+    TinyUSBDevice.attach();
+  }
+}
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+  // use LED do display status
+  if (usb.updateLED(LED_BUILTIN)){
+    Serial.print("Total Microphone samples: ");
+    Serial.print(sample_count_mic);
+    Serial.print(" / Speaker samples: ");
+    Serial.print(sample_count_spk);
+    Serial.print(" / Sample rate: ");
+    Serial.println(usb.rate());
+  }
+}

libraries/audio-tools/examples/examples-communication/usb/microphone/microphone.ino

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+/*********************************************************************
+ This example generates a sawtooth that you can output on your PC
+ We use the AudioTools to generate the data input.
+
+ We could use the callback function here as well, but we demo how
+ to integrate with a (fast) Arduino Stream.
+
+ Please read the Wiki of the project for the supported platforms!
+
+*********************************************************************/
+
+#include "Adafruit_TinyUSB.h" // https://github.com/pschatzmann/Adafruit_TinyUSB_Arduino
+#include "AudioTools.h"  // https://github.com/pschatzmann/arduino-audio-tools
+
+Adafruit_USBD_Audio usb;
+AudioInfo info(44100, 2, 16);
+SawToothGenerator<int16_t> sawtooth;               
+GeneratedSoundStream<int16_t> sawthooth_stream(sawtooth);
+
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
+  Serial.begin(115200);
+  //while(!Serial);  // wait for serial
+
+  // generate 493 hz (note B4)
+  sawtooth.begin(info, 493.0f);
+
+  // Start USB device as Audio Source
+  usb.setInput(sawthooth_stream);
+  usb.begin(info.sample_rate, info.channels, info.bits_per_sample);
+
+  // If already enumerated, additional class driverr begin() e.g msc, hid, midi won't take effect until re-enumeration
+  if (TinyUSBDevice.mounted()) {
+    TinyUSBDevice.detach();
+    delay(10);
+    TinyUSBDevice.attach();
+  }
+}
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+  // optional: use LED do display status
+  usb.updateLED();
+}