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libraries/audio-tools/examples/examples-dsp/examples-maximilian/20-FFT/20-FFT.ino

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+
+// WARNNG: This sketch is too big to fit on an ESP32 w/o PSRAM !
+
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/MaximilianDSP.h"
+#include "libs/maxim.h"
+
+// Define Arduino output
+I2SStream out;
+Maximilian maximilian(out);
+
+// Maximilian
+maxiOsc mySine, myPhasor; // This is the oscillator we will use to generate the test tone
+maxiFFT myFFT;
+
+void setup() {
+    // setup logging
+    Serial.begin(115200);
+    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+    // setup audio output
+    auto cfg = out.defaultConfig(TX_MODE);
+    out.begin(cfg);
+    maximilian.begin(cfg);
+
+    // setup maximilian       
+    myFFT.setup(512, 512, 256);
+    
+}
+
+void play(float *output) {    
+    float myOut=mySine.sinewave(myPhasor.phasorBetween(0.2,100,5000));
+    //output[0] is the left output. output[1] is the right output
+    
+    if (myFFT.process(myOut)) {
+        //if you want you can mess with FFT frame values in here
+        
+    }
+    
+    output[0]=myOut;//simple as that!
+    output[1]=output[0];
+}
+
+
+// Arduino loop
+void loop() {
+    maximilian.copy();
+}