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98 lines
3.3 KiB
98 lines
3.3 KiB
// 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 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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#include "AudioStream_F32.h"
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// Memory for IQ FFT
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float32_t fftOutput[4096]; // Array to allow fftBuffer[] to be available for new in data
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float32_t window[2048]; // Half size window storage
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float32_t fftBuffer[8192]; // Used for FFT, 4096 real, 4096 imag, interleaved
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float32_t sumsq[4096]; // Required if power averaging is being done
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int jj;
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// GUItool: begin automatically generated code
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AudioSynthSineCosine_F32 sine_cos1; //xy=76,532
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// Optional
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// (float32_t* _pOutput, float32_t* _pWindow, float32_t* _pFFT_buffer, float32_t* _pSumsq)
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//AudioAnalyzeFFT4096_IQEM_F32 FFT4096iqEM1(fftOutput, window, fftBuffer); //xy=243,532
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AudioAnalyzeFFT4096_IQEM_F32 FFT4096iqEM1(fftOutput, window, fftBuffer, sumsq); // w/ power ave
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AudioOutputI2S_F32 audioOutI2S1; //xy=246,591
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AudioConnection_F32 patchCord1(sine_cos1, 0, FFT4096iqEM1, 0);
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AudioConnection_F32 patchCord2(sine_cos1, 1, FFT4096iqEM1, 1);
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// GUItool: end automatically generated code
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void setup(void) {
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Serial.begin(9600);
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delay(1000);
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// The 4096 complex FFT needs 32 F32 memory for real and 32 for imag.
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// Set memory to more than 64, depending on other useage.
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AudioMemory_F32(100);
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Serial.println("FFT4096IQem Test");
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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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// or pick any old frequency
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sine_cos1.frequency(1000.0f);
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// elect the output format, FFT_RMS, FFT_POWER, or FFT_DBFS
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FFT4096iqEM1.setOutputType(FFT_DBFS);
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// Select the wndow function, designed by FFT object
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//FFT4096iqEM1.windowFunction(AudioWindowNone);
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//FFT4096iqEM1.windowFunction(AudioWindowHanning4096);
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//FFT4096iqEM1.windowFunction(AudioWindowKaiser4096, 55.0f);
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FFT4096iqEM1.windowFunction(AudioWindowBlackmanHarris4096);
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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, 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(4);
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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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// Print output, once
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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)); // 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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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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