PaulStoffregen
6 years ago
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examples/Synthesis/Waveforms/Waveforms.ino
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| // Waveform Example - Create 2 waveforms with adjustable | |||
| // frequency and phase | |||
| // | |||
| // This example is meant to be used with 3 buttons (pin 0, | |||
| // 1, 2) and 2 knobs (pins 16/A2, 17/A3), which are present | |||
| // on the audio tutorial kit. | |||
| // https://www.pjrc.com/store/audio_tutorial_kit.html | |||
| // | |||
| // Use an oscilloscope to view the 2 waveforms. | |||
| // | |||
| // Button0 changes the waveform shape | |||
| // | |||
| // Knob A2 changes the frequency of both waveforms | |||
| // You should see both waveforms "stretch" as you turn | |||
| // | |||
| // Knob A3 changes the phase of waveform #1 | |||
| // You should see the waveform shift horizontally | |||
| // | |||
| // This example code is in the public domain. | |||
| #include <Audio.h> | |||
| #include <Wire.h> | |||
| #include <SPI.h> | |||
| #include <SD.h> | |||
| #include <SerialFlash.h> | |||
| #include <Bounce.h> | |||
| AudioSynthWaveform waveform1; //xy=171,84 | |||
| AudioSynthWaveform waveform2; //xy=178,148 | |||
| AudioOutputI2S i2s1; //xy=360,98 | |||
| AudioOutputAnalogStereo dacs1; //xy=372,173 | |||
| AudioConnection patchCord1(waveform1, 0, i2s1, 0); | |||
| AudioConnection patchCord2(waveform1, 0, dacs1, 0); | |||
| AudioConnection patchCord3(waveform2, 0, i2s1, 1); | |||
| AudioConnection patchCord4(waveform2, 0, dacs1, 1); | |||
| AudioControlSGTL5000 sgtl5000_1; //xy=239,232 | |||
| Bounce button0 = Bounce(0, 15); | |||
| Bounce button1 = Bounce(1, 15); | |||
| Bounce button2 = Bounce(2, 15); | |||
| int current_waveform=0; | |||
| extern const int16_t myWaveform[256]; // defined in myWaveform.ino | |||
| void setup() { | |||
| Serial.begin(9600); | |||
| pinMode(0, INPUT_PULLUP); | |||
| pinMode(1, INPUT_PULLUP); | |||
| pinMode(2, INPUT_PULLUP); | |||
| // Audio connections require memory to work. For more | |||
| // detailed information, see the MemoryAndCpuUsage example | |||
| AudioMemory(10); | |||
| // Comment these out if not using the audio adaptor board. | |||
| // This may wait forever if the SDA & SCL pins lack | |||
| // pullup resistors | |||
| sgtl5000_1.enable(); | |||
| sgtl5000_1.volume(0.8); // caution: very loud - use oscilloscope only! | |||
| // Confirgure both to use "myWaveform" for WAVEFORM_ARBITRARY | |||
| waveform1.arbitraryWaveform(myWaveform, 172.0); | |||
| waveform2.arbitraryWaveform(myWaveform, 172.0); | |||
| // configure both waveforms for 440 Hz and maximum amplitude | |||
| waveform1.frequency(440); | |||
| waveform2.frequency(440); | |||
| waveform1.amplitude(1.0); | |||
| waveform2.amplitude(1.0); | |||
| current_waveform = WAVEFORM_TRIANGLE; | |||
| waveform1.begin(current_waveform); | |||
| } | |||
| void loop() { | |||
| // Read the buttons and knobs, scale knobs to 0-1.0 | |||
| button0.update(); | |||
| button1.update(); | |||
| button2.update(); | |||
| float knob_A2 = (float)analogRead(A2) / 1023.0; | |||
| float knob_A3 = (float)analogRead(A3) / 1023.0; | |||
| AudioNoInterrupts(); | |||
| // use Knob A2 to adjust the frequency of both waveforms | |||
| waveform1.frequency(100.0 + knob_A2 * 900.0); | |||
| waveform2.frequency(100.0 + knob_A2 * 900.0); | |||
| // use Knob A3 to adjust the phase of only waveform #1 | |||
| waveform1.phase(knob_A3 * 360.0); | |||
| AudioInterrupts(); | |||
| // Button 0 changes the waveform type | |||
| if (button0.fallingEdge()) { | |||
| switch (current_waveform) { | |||
| case WAVEFORM_SINE: | |||
| current_waveform = WAVEFORM_SAWTOOTH; | |||
| Serial.println("Sawtooth"); | |||
| break; | |||
| case WAVEFORM_SAWTOOTH: | |||
| current_waveform = WAVEFORM_SAWTOOTH_REVERSE; | |||
| Serial.println("Reverse Sawtooth"); | |||
| break; | |||
| case WAVEFORM_SAWTOOTH_REVERSE: | |||
| current_waveform = WAVEFORM_SQUARE; | |||
| Serial.println("Square"); | |||
| break; | |||
| case WAVEFORM_SQUARE: | |||
| current_waveform = WAVEFORM_TRIANGLE; | |||
| Serial.println("Triangle"); | |||
| break; | |||
| case WAVEFORM_TRIANGLE: | |||
| current_waveform = WAVEFORM_ARBITRARY; | |||
| Serial.println("Arbitary Waveform"); | |||
| break; | |||
| case WAVEFORM_ARBITRARY: | |||
| current_waveform = WAVEFORM_PULSE; | |||
| Serial.println("Pulse"); | |||
| break; | |||
| case WAVEFORM_PULSE: | |||
| current_waveform = WAVEFORM_SAMPLE_HOLD; | |||
| Serial.println("Sample & Hold"); | |||
| break; | |||
| case WAVEFORM_SAMPLE_HOLD: | |||
| current_waveform = WAVEFORM_SINE; | |||
| Serial.println("Sine"); | |||
| break; | |||
| } | |||
| AudioNoInterrupts(); | |||
| waveform1.begin(current_waveform); | |||
| waveform2.begin(WAVEFORM_SINE); | |||
| AudioInterrupts(); | |||
| } | |||
| } | |||
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examples/Synthesis/Waveforms/myWaveform.ino
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| const int16_t myWaveform[256] = { | |||
| 0, 1895, 3748, 5545, 7278, 8934, 10506, 11984, 13362, 14634, | |||
| 15794, 16840, 17769, 18580, 19274, 19853, 20319, 20678, 20933, 21093, | |||
| 21163, 21153, 21072, 20927, 20731, 20492, 20221, 19929, 19625, 19320, | |||
| 19022, 18741, 18486, 18263, 18080, 17942, 17853, 17819, 17841, 17920, | |||
| 18058, 18254, 18507, 18813, 19170, 19573, 20017, 20497, 21006, 21538, | |||
| 22085, 22642, 23200, 23753, 24294, 24816, 25314, 25781, 26212, 26604, | |||
| 26953, 27256, 27511, 27718, 27876, 27986, 28049, 28068, 28047, 27989, | |||
| 27899, 27782, 27644, 27490, 27326, 27159, 26996, 26841, 26701, 26582, | |||
| 26487, 26423, 26392, 26397, 26441, 26525, 26649, 26812, 27012, 27248, | |||
| 27514, 27808, 28122, 28451, 28787, 29124, 29451, 29762, 30045, 30293, | |||
| 30495, 30643, 30727, 30738, 30667, 30509, 30254, 29897, 29433, 28858, | |||
| 28169, 27363, 26441, 25403, 24251, 22988, 21620, 20150, 18587, 16939, | |||
| 15214, 13423, 11577, 9686, 7763, 5820, 3870, 1926, 0, -1895, | |||
| -3748, -5545, -7278, -8934,-10506,-11984,-13362,-14634,-15794,-16840, | |||
| -17769,-18580,-19274,-19853,-20319,-20678,-20933,-21093,-21163,-21153, | |||
| -21072,-20927,-20731,-20492,-20221,-19929,-19625,-19320,-19022,-18741, | |||
| -18486,-18263,-18080,-17942,-17853,-17819,-17841,-17920,-18058,-18254, | |||
| -18507,-18813,-19170,-19573,-20017,-20497,-21006,-21538,-22085,-22642, | |||
| -23200,-23753,-24294,-24816,-25314,-25781,-26212,-26604,-26953,-27256, | |||
| -27511,-27718,-27876,-27986,-28049,-28068,-28047,-27989,-27899,-27782, | |||
| -27644,-27490,-27326,-27159,-26996,-26841,-26701,-26582,-26487,-26423, | |||
| -26392,-26397,-26441,-26525,-26649,-26812,-27012,-27248,-27514,-27808, | |||
| -28122,-28451,-28787,-29124,-29451,-29762,-30045,-30293,-30495,-30643, | |||
| -30727,-30738,-30667,-30509,-30254,-29897,-29433,-28858,-28169,-27363, | |||
| -26441,-25403,-24251,-22988,-21620,-20150,-18587,-16939,-15214,-13423, | |||
| -11577, -9686, -7763, -5820, -3870, -1926 | |||
| }; | |||
| /* | |||
| #! /usr/bin/perl | |||
| $len = 256; | |||
| print "const int16_t myWaveform[256] = {\n"; | |||
| for ($i=0; $i < $len; $i++) { | |||
| $x = $i / $len * 2 * 3.141592654; | |||
| $r = $x - 0.12486762; | |||
| $y = 0.95 * sin($r) + 0.25 * sin($r * 3 + 0.7) + 0.15 * sin($r * 5 - 5.4); | |||
| #print "$x $y\n"; | |||
| $d = sprintf "%.0f", $y * 32767.0; | |||
| printf "%6d", $d + 0; | |||
| print "," if ($i < $len-1); | |||
| print "\n" if ($i % 10) == 9; | |||
| } | |||
| print "\n" unless ($len % 10) == 9; | |||
| print "};\n"; | |||
| */ | |||
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