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90 lines
2.8 KiB
90 lines
2.8 KiB
/* ReceiverPart1.ino Bob Larkin 20 April 2020
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* This is "Hello World" of Radio design. It can
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* receive a Lower Sideband signal, but that is it.
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* To test the floating point radio receiver blocks:
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* AudioFilter90Deg_F32
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* RadioIQMixer_F32
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*/
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#include "Audio.h"
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#include <OpenAudio_ArduinoLibrary.h>
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#include "DSP_TeensyAudio_F32.h"
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AudioInputI2S i2s1;
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AudioSynthWaveformSine_F32 sine1; // Test signal
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RadioIQMixer_F32 iqmixer1;
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AudioFilter90Deg_F32 hilbert1;
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// NOTE: Use AudioMixer4_F32 *from Tympan*
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AudioMixer4_F32 sum1;
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AudioRecordQueue_F32 queue1; // The LSB output
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AudioRecordQueue_F32 queue2; // The test sine wave
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AudioConnection_F32 patchCord0(sine1, 0, iqmixer1, 0);
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AudioConnection_F32 patchCord2(sine1, 0, iqmixer1, 1);
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AudioConnection_F32 patchCord4(iqmixer1, 0, hilbert1, 0);
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AudioConnection_F32 patchCord5(iqmixer1, 1, hilbert1, 1);
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AudioConnection_F32 patchCord6(hilbert1, 0, sum1, 0);
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AudioConnection_F32 patchCord7(hilbert1, 1, sum1, 1);
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AudioConnection_F32 patchCord8(sum1, 0, queue1, 0);
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AudioConnection_F32 patchCord9(sine1, 0, queue2, 0);
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// Pick one of these
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#include "hilbert19A.h"
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#include "hilbert121A.h"
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#include "hilbert251A.h"
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float dt1[128];
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float dt2[128];
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float *pq1, *pd1, *pq2, *pd2;
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int i, k;
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void setup(void) {
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AudioMemory(5);
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AudioMemory_F32(10);
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Serial.begin(300); delay(1000);
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sine1.frequency(14000.0);
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iqmixer1.frequency(16000.0);
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// Pick one of the three, the 251 does not have
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// enough samples here to show the full build-up.
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// hilbert1.begin(hilbert19A, 19);
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// hilbert1.begin(hilbert121A, 121);
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hilbert1.begin(hilbert121A, 121);
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sum1.gain(0, 1.0); // Leave at 1.0
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sum1.gain(1, -1.0); // -1 for LSB out
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iqmixer1.showError(1); // Prints update() errors
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hilbert1.showError(1);
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queue1.begin();
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queue2.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 128 samples and output to Serial
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// This "if" will be active for i == 0
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if (queue1.available() >= 1 && i==0) {
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pq1 = queue1.readBuffer();
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pd1 = &dt1[0];
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pq2 = queue2.readBuffer();
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pd2 = &dt2[0];
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for(k=0; k<128; k++) {
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*pd1++ = *pq1++;
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*pd2++ = *pq2++;
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}
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i=1; // Only collect 1 block
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Serial.print("Maximum F32 memory usage at loop:");
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Serial.println( AudioMemoryUsageMax_F32() );
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queue1.freeBuffer();
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queue2.freeBuffer();
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queue1.end(); // No more data to queue1
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queue2.end(); // No more data to queue2
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}
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if(i == 1) {
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Serial.println("128 Samples: Time (sec), LSB Out, Sine Wave In");
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for (k=0; k<128; k++) {
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Serial.print (0.000022667*(float32_t)k, 6); Serial.print (",");
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Serial.print (dt1[k],7); Serial.print (",");
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Serial.println (dt2[k],7);
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}
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i = 2;
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}
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}
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