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95 lines
3.1 KiB
95 lines
3.1 KiB
//
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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 power output from 512 frequency analysis bins are printed to
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// the Arduino Serial Monitor. The format is selectable.
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// Output power averaging is an option
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//
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// T4.0: Uses 7.8% 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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// 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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float saveDat[512];
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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(50);
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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(AUDIO_INPUT_LINEIN);
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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(1033.99f); // Bin 24 T3.x
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// sinewave.frequency(1033.59375f); // Bin 24 T4.x at 44100
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// sinewave.frequency(1055.0f); // Bin 24.5, demonstrates windowing
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// Or some random frequency:
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sinewave.frequency(1234.5f);
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sinewave.amplitude(1.0f);
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// Set windowing function
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// myFFT.windowFunction(AudioWindowNone);
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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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myFFT.setNAverage(1);
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myFFT.setOutputType(FFT_DBFS); // FFT_RMS or FFT_POWER or FFT_DBFS
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Serial.println("1024 point real FFT output in dB relative to full scale sine wave");
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}
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void loop() {
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static uint32_t nTimes = 0;
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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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float* pin = myFFT.getData();
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for (int kk=0; kk<512; kk++)
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saveDat[kk]= *(pin + kk);
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if(++nTimes>4 && nTimes<6) {
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for (int i=0; i<512; i++) {
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Serial.print(i);
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Serial.print(", ");
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Serial.println(saveDat[i], 8);
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}
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Serial.println();
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Serial.print("CPU: Max Percent Usage: ");
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Serial.println(AudioProcessorUsageMax());
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Serial.print(" Max Float 32 Memory: ");
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Serial.println(AudioMemoryUsageMax_F32());
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}
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}
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}
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