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107 lines
3.4 KiB
107 lines
3.4 KiB
/* ReceiverFM.ino Bob Larkin 26 April 2020
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* This is a simple test of introducing a sine wave to the
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* FM Detector and taking 512 samples of the output. It is
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* a static test with a fixed frequency for test and so
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* the output DC value and noise can be tested. Note that the 512
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* samples include the startup transient, so the first 300,
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* or so, points should be ignored in seeing the DC value.
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*
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* Change the value of sine1.frequency to see the DC output change.
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* See FMReceiver2.ino for testing with real AC modulation.
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*/
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#include "Audio.h"
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#include <OpenAudio_ArduinoLibrary.h>
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// Uncomment the lines "SINE" for internally generated sine wave.
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// Uncomment the lines "ADC" to use the SGTL5000 Teensy audio adaptor
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// AudioInputI2S_F32 i2sIn; // ADC
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AudioSynthWaveformSine_F32 sine1; // SINE
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RadioFMDetector_F32 fmDet1;
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AudioRecordQueue_F32 queue1;
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AudioOutputI2S_F32 i2sOut; // Leave in for timing
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// AudioControlSGTL5000 sgtl5000_1; // ADC
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// AudioConnection_F32 connect0(i2sIn, 0, fmDet1, 0); // ADC
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AudioConnection_F32 connect0(sine1, 0, fmDet1, 0); // SINE
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// AudioConnection_F32 connect1(sine1, 0, queue1, 0);
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AudioConnection_F32 connect3(fmDet1, 0, i2sOut, 0);
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AudioConnection_F32 connect5(fmDet1, 0, queue1, 0);
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float dt1[512]; // Place to save output
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float *pq1, *pd1;
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uint16_t k;
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int i;
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void setup(void) {
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AudioMemory(5);
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AudioMemory_F32(5);
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Serial.begin(300); delay(1000); // Any rate is OK
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Serial.println("Serial Started");
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// sgtl5000_1.enable(); // ADC
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// sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN); //ADC
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sine1.frequency(14000.0); // SINE
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// The FM detector has error checking during object construction
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// when Serial.print is not available. See RadioFMDetector_F32.h:
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Serial.print("FM Initialization errors: ");
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Serial.println( fmDet1.returnInitializeFMError() );
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// The following enables error checking inside of the "ubdate()"
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// Output goes to the Serial (USB) Monitor. Normally, this is quiet.
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fmDet1.showError(1);
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queue1.begin();
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i = 0; k=0;
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}
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void loop(void) {
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// Collect 512 samples and output to Serial
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// This "if" will be active for i = 0,1,2,3
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if (queue1.available() >= 1) {
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if( i>=0 && i<4) {
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pq1 = queue1.readBuffer();
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pd1 = &dt1[i*128];
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for(k=0; k<128; k++) {
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*pd1++ = *pq1++;
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}
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queue1.freeBuffer();
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if(i++==3) {
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i=4; // Only collect 4 blocks
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queue1.end(); // No more data to queue1
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}
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}
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else {
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queue1.freeBuffer();
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}
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}
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// We have 512 data samples. Serial.print them
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if(i == 4) {
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Serial.println("512 Time in seconds and FM Output samples:");
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for (k=0; k<512; k++) {
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Serial.print (0.000022667*(float32_t)k, 6); Serial.print (",");
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Serial.println (dt1[k],7);
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}
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i = 5;
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}
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if(i==5) {
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i = 6;
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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("Int16 Memory Usage, Max: ");
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Serial.print(AudioMemoryUsage());
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Serial.print(", ");
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Serial.println(AudioMemoryUsageMax());
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Serial.print("Float Memory Usage, Max: ");
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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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Serial.println();
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}
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}
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