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OpenAudio_ArduinoLibrary/examples/TestFFT2048iq/TestFFT2048iq.ino

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1.8 KiB

// TestFFT2048iq.ino for Teensy 4.x
// Bob Larkin 9 March 2021
// Generate Sin and Cosine pair and input to IQ FFT.
// Serial Print out powers of all 2048 bins in
// dB relative to Sine Wave Full Scale
// Public Domain
#include "OpenAudio_ArduinoLibrary.h"
#include "AudioStream_F32.h"
// GUItool: begin automatically generated code
AudioSynthSineCosine_F32 sine_cos1; //xy=76,532
AudioAnalyzeFFT2048_IQ_F32 FFT2048iq1; //xy=243,532
AudioOutputI2S_F32 audioOutI2S1; //xy=246,591
AudioConnection_F32 patchCord1(sine_cos1, 0, FFT2048iq1, 0);
AudioConnection_F32 patchCord2(sine_cos1, 1, FFT2048iq1, 1);
// GUItool: end automatically generated code
void setup(void) {
float* pPwr;
Serial.begin(9600);
delay(1000);
AudioMemory_F32(50);
Serial.println("FFT2048IQ Test");
sine_cos1.amplitude(1.0f); // Initialize Waveform Generator
// Pick T4.x bin center
sine_cos1.frequency(689.0625f);
// or pick any old frequency
//sine_cos1.frequency(7100.0);
// elect the output format
FFT2048iq1.setOutputType(FFT_DBFS);
// Select the wndow function
//FFT2048iq1.windowFunction(AudioWindowNone);
//FFT2048iq1.windowFunction(AudioWindowHanning2048);
//FFT2048iq1.windowFunction(AudioWindowKaiser2048, 55.0f);
FFT2048iq1.windowFunction(AudioWindowBlackmanHarris2048);
// Uncomment to Serial print window function
//float* pw = FFT2048iq1.getWindow(); // Print window
//for (int i=0; i<2048; i++) Serial.println(pw[i], 4);
// xAxis, bit 0 left/right; bit 1 low to high; default 0X03
FFT2048iq1.setXAxis(0X03);
delay(1000);
// Print output, once
if( FFT2048iq1.available() ) {
pPwr = FFT2048iq1.getData();
for(int i=0; i<2048; i++)
Serial.println(*(pPwr + i), 8 );
}
Serial.println("");
}
void loop(void) {
}