So I'm following the Teensy Synth tutorial by Dave (https://www.youtube.com/watch?v=UJcZxyB5rVc), but with a few differences:
- I'm using PureData solely as a MIDI passthrough
- I'm using an ILI9341 touchscreen for controlling parameters instead
- I have a Teensy 3.5 with Audio Shield
- I want my Synth to be 8 tone polyphonic
Here is my code:
And here is what the audio system looks like:
And here is my problem: Everything works just fine, but there won't be any audio output coming from the Teensy.
The MIDI works, the audio objects are connected properly, the oscillators are supposed to generate sound, but they don't.
And for some unknown reason, the peak objects all return a value of 1.0, even if the oscillators aren't playing.
EDIT: Also the hardware is fine. If I upload the sketch Dave provided in part 3 of his tutorial, I get audio output.
- I'm using PureData solely as a MIDI passthrough
- I'm using an ILI9341 touchscreen for controlling parameters instead
- I have a Teensy 3.5 with Audio Shield
- I want my Synth to be 8 tone polyphonic
Here is my code:
Code:
#include <ILI9341_t3.h>
#include <font_Arial.h>
#include <XPT2046_Touchscreen.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code
AudioSynthWaveform waveform00; //xy=425,109
AudioSynthWaveform waveform40; //xy=422.8571472167969,715.7142944335938
AudioSynthWaveform waveform20; //xy=424.2857360839844,378.5714416503906
AudioSynthWaveform waveform60; //xy=422.14288330078125,985.2857360839844
AudioSynthWaveform waveform30; //xy=424.2857360839844,507.1428527832031
AudioSynthWaveform waveform70; //xy=422.14288330078125,1113.8571472167969
AudioSynthWaveform waveform10; //xy=425.71429443359375,245.7142677307129
AudioSynthWaveform waveform50; //xy=423.5714416503906,852.4285621643066
AudioSynthWaveform waveform01; //xy=428.7142791748047,149.28571701049805
AudioSynthWaveform waveform41; //xy=426.57142639160156,756.0000114440918
AudioSynthWaveform waveform21; //xy=428.00001525878906,418.8571586608887
AudioSynthWaveform waveform61; //xy=425.85716247558594,1025.5714530944824
AudioSynthWaveform waveform31; //xy=428.00001525878906,547.4285697937012
AudioSynthWaveform waveform71; //xy=425.85716247558594,1154.142864227295
AudioSynthWaveform waveform11; //xy=429.42857360839844,285.99998474121094
AudioSynthWaveform waveform51; //xy=427.2857208251953,892.7142791748047
AudioSynthNoisePink noise0; //xy=435.00000762939453,189.2857265472412
AudioSynthNoisePink noise4; //xy=432.8571548461914,796.000020980835
AudioSynthNoisePink noise2; //xy=434.2857437133789,458.85716819763184
AudioSynthNoisePink noise6; //xy=432.1428909301758,1065.5714626312256
AudioSynthNoisePink noise3; //xy=434.2857437133789,587.4285793304443
AudioSynthNoisePink noise7; //xy=432.1428909301758,1194.142873764038
AudioSynthNoisePink noise1; //xy=435.7143020629883,325.9999942779541
AudioSynthNoisePink noise5; //xy=433.57144927978516,932.7142887115479
AudioMixer4 mixer0; //xy=621.2500076293945,169.25000190734863
AudioMixer4 mixer4; //xy=622.8571472167969,759.7142944335938
AudioMixer4 mixer2; //xy=624.2857360839844,422.5714416503906
AudioMixer4 mixer6; //xy=622.1428833007812,1029.2857360839844
AudioMixer4 mixer3; //xy=624.2857360839844,551.1428527832031
AudioMixer4 mixer7; //xy=622.1428833007812,1157.8571472167969
AudioMixer4 mixer1; //xy=625.7142944335938,289.7142677307129
AudioMixer4 mixer5; //xy=623.5714416503906,896.4285621643066
AudioAnalyzePeak peak1; //xy=801.4285714285713,85.71428571428571
AudioMixer4 mixer8; //xy=808.5713958740234,361.4285831451416
AudioMixer4 mixer9; //xy=832.857120513916,970.000036239624
AudioAnalyzePeak peak2; //xy=909.9999999999999,158.57142857142856
AudioMixer4 mixer10; //xy=1127.142857142857,617.1428571428571
AudioAnalyzePeak peak3; //xy=1154.2857142857142,281.4285714285714
AudioOutputI2S i2s1; //xy=1375.5713539123535,615.285722732544
AudioAnalyzePeak peak4; //xy=1395.7142857142856,499.99999999999994
AudioConnection patchCord1(waveform00, 0, mixer0, 0);
AudioConnection patchCord2(waveform00, peak1);
AudioConnection patchCord3(waveform40, 0, mixer4, 0);
AudioConnection patchCord4(waveform20, 0, mixer2, 0);
AudioConnection patchCord5(waveform60, 0, mixer6, 0);
AudioConnection patchCord6(waveform30, 0, mixer3, 0);
AudioConnection patchCord7(waveform70, 0, mixer7, 0);
AudioConnection patchCord8(waveform10, 0, mixer1, 0);
AudioConnection patchCord9(waveform50, 0, mixer5, 0);
AudioConnection patchCord10(waveform01, 0, mixer0, 1);
AudioConnection patchCord11(waveform41, 0, mixer4, 1);
AudioConnection patchCord12(waveform21, 0, mixer2, 1);
AudioConnection patchCord13(waveform61, 0, mixer6, 1);
AudioConnection patchCord14(waveform31, 0, mixer3, 1);
AudioConnection patchCord15(waveform71, 0, mixer7, 1);
AudioConnection patchCord16(waveform11, 0, mixer1, 1);
AudioConnection patchCord17(waveform51, 0, mixer5, 1);
AudioConnection patchCord18(noise0, 0, mixer0, 2);
AudioConnection patchCord19(noise4, 0, mixer4, 2);
AudioConnection patchCord20(noise2, 0, mixer2, 2);
AudioConnection patchCord21(noise6, 0, mixer6, 2);
AudioConnection patchCord22(noise3, 0, mixer3, 2);
AudioConnection patchCord23(noise7, 0, mixer7, 2);
AudioConnection patchCord24(noise1, 0, mixer1, 2);
AudioConnection patchCord25(noise5, 0, mixer5, 2);
AudioConnection patchCord26(mixer0, 0, mixer8, 0);
AudioConnection patchCord27(mixer0, peak2);
AudioConnection patchCord28(mixer4, 0, mixer9, 0);
AudioConnection patchCord29(mixer2, 0, mixer8, 2);
AudioConnection patchCord30(mixer6, 0, mixer9, 2);
AudioConnection patchCord31(mixer3, 0, mixer8, 3);
AudioConnection patchCord32(mixer7, 0, mixer9, 3);
AudioConnection patchCord33(mixer1, 0, mixer8, 1);
AudioConnection patchCord34(mixer5, 0, mixer9, 1);
AudioConnection patchCord35(mixer8, 0, mixer10, 0);
AudioConnection patchCord36(mixer8, peak3);
AudioConnection patchCord37(mixer9, 0, mixer10, 1);
AudioConnection patchCord38(mixer10, 0, i2s1, 0);
AudioConnection patchCord39(mixer10, 0, i2s1, 1);
AudioConnection patchCord40(mixer10, peak4);
AudioControlSGTL5000 audioShield; //xy=1126.5357818603516,419.28571128845215
// GUItool: end automatically generated code
AudioAnalyzePeak peaks[4] = {peak1, peak2, peak3, peak4};
AudioSynthWaveform primOscs[8] = {waveform00, waveform10, waveform20, waveform30, waveform40, waveform50, waveform60, waveform70};
AudioSynthWaveform secondOscs[8] = {waveform01, waveform11, waveform21, waveform31, waveform41, waveform51, waveform61, waveform71};
AudioSynthNoisePink noises[8] = {noise0, noise1, noise2, noise3, noise4, noise5, noise6, noise7};
AudioMixer4 mixers[11] = {mixer0, mixer1, mixer2, mixer3, mixer4, mixer5, mixer6, mixer7, mixer8, mixer9, mixer10};
ILI9341_t3 tft = ILI9341_t3(21, 20, 255, 7, 14, 12);
XPT2046_Touchscreen ts(8);
bool wasTouched = false;
int lastbtn = 0;
bool isNewMenu = false;
int currentMenu = 0;
const String menu0[8] = {"Waveform", "Button 2", "Button 3", "Button 4", "Button 5", "Button 6", "Button 7", "Button 8"};
const String menu1[8] = {"Go Back", "Sine", "Saw", "Saw Rev", "Square", "Triangle", "", ""};
const String menuArray[2][8] = {menu0, menu1};
const float div127 = (1.0 / 127.0);
const float noteFreqs[128] = {8.176, 8.662, 9.177, 9.723, 10.301, 10.913, 11.562, 12.25, 12.978, 13.75, 14.568, 15.434, 16.352, 17.324, 18.354, 19.445, 20.602, 21.827, 23.125, 24.5, 25.957, 27.5, 29.135, 30.868, 32.703, 34.648, 36.708, 38.891, 41.203, 43.654, 46.249, 48.999, 51.913, 55, 58.27, 61.735, 65.406, 69.296, 73.416, 77.782, 82.407, 87.307, 92.499, 97.999, 103.826, 110, 116.541, 123.471, 130.813, 138.591, 146.832, 155.563, 164.814, 174.614, 184.997, 195.998, 207.652, 220, 233.082, 246.942, 261.626, 277.183, 293.665, 311.127, 329.628, 349.228, 369.994, 391.995, 415.305, 440, 466.164, 493.883, 523.251, 554.365, 587.33, 622.254, 659.255, 698.456, 739.989, 783.991, 830.609, 880, 932.328, 987.767, 1046.502, 1108.731, 1174.659, 1244.508, 1318.51, 1396.913, 1479.978, 1567.982, 1661.219, 1760, 1864.655, 1975.533, 2093.005, 2217.461, 2349.318, 2489.016, 2637.02, 2793.826, 2959.955, 3135.963, 3322.438, 3520, 3729.31, 3950.566, 4186.009, 4434.922, 4698.636, 4978.032, 5274.041, 5587.652, 5919.911, 6271.927, 6644.875, 7040, 7458.62, 7902.133, 8372.018, 8869.844, 9397.273, 9956.063, 10548.08, 11175.3, 11839.82, 12543.85};
const int octave = 12;
bool isPlaying[8];
byte oscNotes[8];
unsigned long timestamp = 0;
void setup(){
Serial.begin(115200);
setupAudio();
usbMIDI.setHandleNoteOff(myNoteOff);
usbMIDI.setHandleNoteOn(myNoteOn);
tft.begin();
tft.setRotation(0);
ts.begin();
ts.setRotation(0);
tft.setFont(Arial_16);
resetAllButtons();
}
void setupAudio(){
AudioMemory(400);
audioShield.enable();
audioShield.volume(0.7);
for(int i = 0; i < 8; i++){
primOscs[i].begin(WAVEFORM_SAWTOOTH);
secondOscs[i].begin(WAVEFORM_SAWTOOTH);
primOscs[i].amplitude(0.0);
secondOscs[i].amplitude(0.0);
primOscs[i].pulseWidth(0.15);
secondOscs[i].pulseWidth(0.15);
}
for(int i = 0; i < 8; i++){
mixers[i].gain(0, 0.3);
mixers[i].gain(1, 0.3);
mixers[i].gain(2, 0.3);
}
for(int i = 0; i < 4; i++){
mixers[8].gain(i, 0.25);
mixers[9].gain(i, 0.25);
}
mixers[10].gain(0, 0.5);
mixers[10].gain(1, 0.5);
}
void loop() {
usbMIDI.read();
if(millis() - timestamp >= 250){
timestamp = millis();
Serial.print("wave00 peak: ");
Serial.print(peak1.read());
Serial.print(", mixer0 peak: ");
Serial.print(peak2.read());
Serial.print(", mixer8 peak: ");
Serial.print(peak3.read());
Serial.print(", mixer10 peak: ");
Serial.println(peak4.read());
}
if(ts.touched() == true && wasTouched == false){
wasTouched = true;
TS_Point p = ts.getPoint();
int y = p.y - 220;
int x = p.x - 300;
if(y <= 920){
if(x >= 1700) button4();
else button8();
}
else if(y <= 1840){
if(x >= 1700) button3();
else button7();
}
else if(y <= 2760){
if(x >= 1700) button2();
else button6();
}
else{
if(x >= 1700) button1();
else button5();
}
}else if(ts.touched() == false && wasTouched == true){
wasTouched = false;
if(isNewMenu) resetAllButtons();
else resetButton(lastbtn);
}
}
void myNoteOn(byte channel, byte note, byte velocity){
if ( note > 23 && note < 108 ){
for(int i = 0; i < 8; i++){
if(!isPlaying[i]){
primOscs[i].frequency(noteFreqs[note]);
float vel = (velocity * div127);
primOscs[i].amplitude(vel);
isPlaying[i] = true;
oscNotes[i] = note;
Serial.print("Playing oscillator ");
Serial.print(i);
Serial.print(" with amplitude ");
Serial.println(vel);
break;
}
}
}
}
void myNoteOff(byte channel, byte note, byte velocity){
Serial.println("key released");
if ( note > 23 && note < 108 ){
for(int i = 0; i < 8; i++){
if(oscNotes[i] == note){
primOscs[i].amplitude(0.0);
isPlaying[i] = false;
break;
}
}
}
}
void setMenu(int m){
currentMenu = m;
isNewMenu = true;
}
void button1(){
lastbtn = 1;
Serial.println("You pressed BUTTON 1");
tft.fillRect(0, 0, 120, 80, ILI9341_BLACK);
tft.setCursor(10, 20);
tft.setTextColor(ILI9341_RED);
tft.print(menuArray[currentMenu][0]);
if(currentMenu == 0) setMenu(1);
else if(currentMenu == 1) setMenu(0);
}
void button2(){
lastbtn = 2;
Serial.println("You pressed BUTTON 2");
tft.fillRect(0, 80, 120, 80, ILI9341_BLACK);
tft.setCursor(10, 100);
tft.setTextColor(ILI9341_GREEN);
tft.print(menuArray[currentMenu][1]);
//if(currentMenu == 1) waveform.begin(WAVEFORM_SINE);
}
void button3(){
lastbtn = 3;
Serial.println("You pressed BUTTON 3");
tft.fillRect(0, 160, 120, 80, ILI9341_BLACK);
tft.setCursor(10, 180);
tft.setTextColor(ILI9341_BLUE);
tft.print(menuArray[currentMenu][2]);
//if(currentMenu == 1) waveform.begin(WAVEFORM_SAWTOOTH);
}
void button4(){
lastbtn = 4;
Serial.println("You pressed BUTTON 4");
tft.fillRect(0, 240, 120, 80, ILI9341_WHITE);
tft.setCursor(10, 260);
tft.setTextColor(ILI9341_BLACK);
tft.print(menuArray[currentMenu][3]);
//if(currentMenu == 1) waveform.begin(WAVEFORM_SAWTOOTH_REVERSE);
}
void button5(){
lastbtn = 5;
Serial.println("You pressed BUTTON 5");
tft.fillRect(120, 0, 120, 80, ILI9341_BLACK);
tft.setCursor(130, 20);
tft.setTextColor(ILI9341_YELLOW);
tft.print(menuArray[currentMenu][4]);
//if(currentMenu == 1) waveform.begin(WAVEFORM_SQUARE);
}
void button6(){
lastbtn = 6;
Serial.println("You pressed BUTTON 6");
tft.fillRect(120, 80, 120, 80, ILI9341_BLACK);
tft.setCursor(130, 100);
tft.setTextColor(ILI9341_CYAN);
tft.print(menuArray[currentMenu][5]);
//if(currentMenu == 1) waveform.begin(WAVEFORM_TRIANGLE);
}
void button7(){
lastbtn = 7;
Serial.println("You pressed BUTTON 7");
tft.fillRect(120, 160, 120, 80, ILI9341_BLACK);
tft.setCursor(130, 180);
tft.setTextColor(ILI9341_MAGENTA);
tft.print(menuArray[currentMenu][6]);
// PASTE BUTTON 7 FUNCTION HERE
}
void button8(){
lastbtn = 8;
Serial.println("You pressed BUTTON 8");
tft.fillRect(120, 240, 120, 80, ILI9341_BLACK);
tft.setCursor(130, 260);
tft.setTextColor(ILI9341_WHITE);
tft.print(menuArray[currentMenu][7]);
// PASTE BUTTON 8 FUNCTION HERE
}
void resetAllButtons(){
for(int i = 1; i < 9; i++){
resetButton(i);
}
}
void resetButton(int btn){
switch(btn){
case 1:
tft.fillRect(0, 0, 120, 80, ILI9341_RED);
tft.setCursor(10, 20);
tft.setTextColor(ILI9341_WHITE);
tft.print(menuArray[currentMenu][0]);
break;
case 2:
tft.fillRect(0, 80, 120, 80, ILI9341_GREEN);
tft.setCursor(10, 100);
tft.setTextColor(ILI9341_WHITE);
tft.print(menuArray[currentMenu][1]);
break;
case 3:
tft.fillRect(0, 160, 120, 80, ILI9341_BLUE);
tft.setCursor(10, 180);
tft.setTextColor(ILI9341_WHITE);
tft.print(menuArray[currentMenu][2]);
break;
case 4:
tft.fillRect(0, 240, 120, 80, ILI9341_BLACK);
tft.setCursor(10, 260);
tft.setTextColor(ILI9341_WHITE);
tft.print(menuArray[currentMenu][3]);
break;
case 5:
tft.fillRect(120, 0, 120, 80, ILI9341_YELLOW);
tft.setCursor(130, 20);
tft.setTextColor(ILI9341_BLACK);
tft.print(menuArray[currentMenu][4]);
break;
case 6:
tft.fillRect(120, 80, 120, 80, ILI9341_CYAN);
tft.setCursor(130, 100);
tft.setTextColor(ILI9341_BLACK);
tft.print(menuArray[currentMenu][5]);
break;
case 7:
tft.fillRect(120, 160, 120, 80, ILI9341_MAGENTA);
tft.setCursor(130, 180);
tft.setTextColor(ILI9341_BLACK);
tft.print(menuArray[currentMenu][6]);
break;
case 8:
tft.fillRect(120, 240, 120, 80, ILI9341_WHITE);
tft.setCursor(130, 260);
tft.setTextColor(ILI9341_BLACK);
tft.print(menuArray[currentMenu][7]);
break;
}
}And here is what the audio system looks like:
And here is my problem: Everything works just fine, but there won't be any audio output coming from the Teensy.
The MIDI works, the audio objects are connected properly, the oscillators are supposed to generate sound, but they don't.
And for some unknown reason, the peak objects all return a value of 1.0, even if the oscillators aren't playing.
EDIT: Also the hardware is fine. If I upload the sketch Dave provided in part 3 of his tutorial, I get audio output.