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@ -1,10 +1,10 @@ |
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// TestFFT2048iqEM.ino for Teensy 4.x
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// *** EXTERNAL MEMORY VERSION of 4095 FFT ***
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// Bob Larkin 9 March 2021
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// Generate Sin and Cosine pair and input to IQ FFT.
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// Serial Print out powers of all 4096 bins in
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// dB relative to Sine Wave Full Scale
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// EXTERNAL MEMORY FFT
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// Serial Print outputs of all 4096 bins.
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//
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// Public Domain
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#include "OpenAudio_ArduinoLibrary.h" |
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@ -41,8 +41,11 @@ void setup(void) { |
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sine_cos1.amplitude(1.0f); // Initialize Waveform Generator
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// Engage the identical BP Filters on sine/cosine outputs (true).
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sine_cos1.pureSpectrum(true); |
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// Pick T4.x bin center
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//sine_cos1.frequency(689.0625f);
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// sine_cos1.frequency(689.0625f);
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// or pick any old frequency
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sine_cos1.frequency(1000.0f); |
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@ -59,36 +62,38 @@ void setup(void) { |
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// Uncomment to Serial print window function
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// for (int i=0; i<2048; i++) Serial.println(*(window+i), 7);
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// xAxis, bit 0 left/right; bit 1 low to high; default 0X03
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FFT4096iqEM1.setXAxis(0X01); |
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// xAxis, See leadin discussion at analyze_fft4096_iqem_F32.h
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FFT4096iqEM1.setXAxis(0X03); // 0X03 default
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// In order to average powers, a buffer for sumsq[4096] must be
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// globally declared and that pointer, sumsq, set as the last
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// parameter in the object creation. Then the following will
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// cause averaging of 4 powers:
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FFT4096iqEM1.setNAverage(20); |
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FFT4096iqEM1.setNAverage(4); |
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jj = 0; // This is todelay data gathering to get steady state
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jj = 0; // This is to delay data gathering to get steady state
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} |
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void loop(void) { |
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static bool doPrint=true; |
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float *pPwr; |
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delay(10); |
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// Print output, once
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if( FFT4096iqEM1.available() && doPrint ) { |
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if( FFT4096iqEM1.available() && jj++>2 && doPrint ) { |
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if(jj++ < 3)return; |
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for(int i=0; i<4096; i++) |
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{ |
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Serial.print((int)((float32_t)i * 44100.0/4096.0)); |
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// Serial.print((int)((float32_t)i * 44100.0/4096.0)); // Print freq
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Serial.print(i); // FFT Output index (0, 4095)
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Serial.print(" "); |
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Serial.println(*(fftOutput + i), 8 ); |
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} |
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doPrint = false; |
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} |
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Serial.print(" Audio MEM Float32 Peak: "); |
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Serial.println(AudioMemoryUsageMax_F32()); |
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delay(500); |
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if(doPrint) |
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{ |
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Serial.print(" Audio MEM Float32 Peak: "); |
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Serial.println(AudioMemoryUsageMax_F32()); |
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} |
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delay(100); |
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} |
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