snapshot

libraries/audio-tools/examples/tests/fft/fft-esp32/fft-esp32.ino

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+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioESP32FFT.h" // Using ESP32FFT
+
+AudioESP32FFT fftc; // or AudioKissFFT
+SineWaveGenerator<int16_t> sineWave(32000);
+GeneratedSoundStream<int16_t> in(sineWave);
+StreamCopy copier(fftc, in);
+AudioInfo info(44100, 1, 16);
+float value = 0;
+
+// display fftc result
+void fftcResult(AudioFFTBase &fftc) {
+  float diff;
+  auto result = fftc.result();
+  if (result.magnitude > 100) {
+    Serial.print(result.frequency);
+    Serial.print(" ");
+    Serial.print(result.magnitude);
+    Serial.print(" => ");
+    Serial.print(result.frequencyAsNote(diff));
+    Serial.print(" diff: ");
+    Serial.print(diff);
+    Serial.print(" - time ms ");
+    Serial.print(fftc.resultTime() - fftc.resultTimeBegin());
+    Serial.println();
+
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // set the frequency
+  sineWave.setFrequency(N_B4);
+
+  // Setup sine wave
+  auto cfg = in.defaultConfig();
+  cfg.copyFrom(info);
+  in.begin(cfg);
+
+  // Setup FFT
+  auto tcfg = fftc.defaultConfig();
+  tcfg.copyFrom(info);
+  tcfg.length = 4096;
+  tcfg.callback = &fftcResult;
+  fftc.begin(tcfg);
+}
+
+void loop() { copier.copy(); }