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95 lines
2.8 KiB
95 lines
2.8 KiB
4 years ago
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// TestFFT1024.ino Bob Larkin W7PUA
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// Started from PJRC Teensy Examples/Audio/Analysis/FFT
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//
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// Compute a 1024 point Fast Fourier Transform (spectrum analysis)
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// on audio connected to the Left Line-In pin. By changing code,
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// a synthetic sine wave can be input instead.
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//
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// The first 40 (of 512) frequency analysis bins are printed to
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// the Arduino Serial Monitor.
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//
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// T4.0: Uses 6.1% processor and 9 F32 memory blocks, both max.
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//
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// This example code is in the public domain.
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#include <Audio.h>
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#include "OpenAudio_ArduinoLibrary.h"
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const int myInput = AUDIO_INPUT_LINEIN;
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//const int myInput = AUDIO_INPUT_MIC;
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// Create the Audio components. These should be created in the
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// order data flows, inputs/sources -> processing -> outputs
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//
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// AudioInputI2S_F32 audioInput; // audio shield: mic or line-in
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AudioSynthSineCosine_F32 sinewave;
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AudioAnalyzeFFT1024_F32 myFFT;
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AudioOutputI2S_F32 audioOutput; // audio shield: headphones & line-out NU
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// Connect either the live input or synthesized sine wave
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// AudioConnection_F32 patchCord1(audioInput, 0, myFFT, 0);
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AudioConnection_F32 patchCord1(sinewave, 0, myFFT, 0);
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AudioControlSGTL5000 audioShield;
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uint32_t count = 0;
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void setup() {
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Serial.begin(300); // Any speed works
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delay(1000);
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AudioMemory_F32(20);
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// Enable the audio shield and set the output volume.
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audioShield.enable();
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audioShield.inputSelect(myInput);
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audioShield.volume(0.5);
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// Set windowing function
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// myFFT.windowFunction(NULL);
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// myFFT.windowFunction(AudioWindowNone); // Same as NULL
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// myFFT.windowFunction(AudioWindowHanning1024); // default
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// The next Kaiser window needs a dB peak sidelobe number
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myFFT.windowFunction(AudioWindowKaiser1024, 70.0f);
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// myFFT.windowFunction(AudioWindowBlackmanHarris1024);
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// To print the window function:
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// float* pw=myFFT.getWindow();
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// for(int jj=0; jj<1024; jj++)
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// Serial.println(*pw++, 6);
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// Create a synthetic sine wave, for testing
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// To use this, edit the connections above
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sinewave.frequency(1034.0); // Bin 24
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// sinewave.frequency(1055.0f); // Bin 24.5, demonstrates windowing
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myFFT.setOutputType(FFT_DBFS); // FFT_RMS or FFT_POWER or FFT_DBFS
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}
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void loop() {
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if (myFFT.available()) {
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// each time new FFT data is available
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// print it all to the Arduino Serial Monitor
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Serial.print("FFT: ");
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for (int i=0; i<40; i++) {
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Serial.print(myFFT.read(i), 2);
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Serial.print(",");
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}
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Serial.println();
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}
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/* if(count++ == 3000) {
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Serial.print("CPU: Percent Usage, Max: ");
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Serial.print(AudioProcessorUsage());
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Serial.print(", ");
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Serial.println(AudioProcessorUsageMax());
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Serial.print(" Float 32 Memory: ");
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Serial.print(AudioMemoryUsage_F32());
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Serial.print(", ");
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Serial.println(AudioMemoryUsageMax_F32());
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}
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delay(2);
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*/
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}
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