where to start to learn programming teensy audio?

benwadub

Active member
hi, i m new to world of programming, can anyone send me a link where I could learn how to use teensy audio library please? I already read the workshop tutorial but I need more basic knowledge by exemple learning how to receive midi note from my controller and learn to implement controls to mixer volume or controlling a delay feedback...
English is not my native language so I d prefer reading than watching video,
the goal is to make a simple synth then implement more functions step by step.
thanks for help!
 
There are MIDI examples in :: ...\hardware\teensy\avr\libraries\Audio\examples\Synthesis\

Also the online GUI here :: pjrc.com/teensy/gui/?info=AudioSynthWavetable
That link opens the first SYNTH item in the RIGHT frame - then lower LEFT frame under SYNTH are other SYNTH elements after AudioSynthWavetable that note examples for each in context.

Hope that helps and one fits the ideas in mind - there may be other better - but not ever worked with Midi here.
 
thanks, I have never seen that function were explain a little bit here! I ll try to understand a little bit more with it!
thank you very much!
i ll check if I find a way to use midi input
 
i start making my code, do you think I m on a good way to declare button and potentiometer?
does including the playsynthmusic.h will allow me to play midi notes according to fréquemment? it s what I thought I understood.

```cpp
// 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 <Encoder.h>
#include <Control_Surface.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
#include <Bounce.h>
#include "PlaySynthMusic.h"

unsigned char *sp = score;

USBMIDI_Interface usbmidi;

AudioControlSGTL5000 sgtl5000_1; //xy=239,232

// GUItool: begin automatically generated code
AudioSynthWaveform waveform1; //xy=91,111
AudioSynthWaveform waveform2; //xy=92,199
AudioMixer4 mixer1; //xy=241,189
AudioEffectDelay delay1; //xy=283,351
AudioOutputI2S i2s2; //xy=305,140
AudioEffectFreeverb freeverb1; //xy=429,435
AudioOutputUSB usb1; //xy=567,331
AudioConnection patchCord1(waveform1, 0, mixer1, 0);
AudioConnection patchCord2(waveform2, 0, mixer1, 1);
AudioConnection patchCord3(mixer1, delay1);
AudioConnection patchCord4(delay1, 0, freeverb1, 0);
AudioConnection patchCord5(freeverb1, 0, usb1, 0);
AudioConnection patchCord6(freeverb1, 0, usb1, 1);
// GUItool: end automatically generated code



CD74HC4067 mux1 = {//déclare un multiplexeur
A3, // numéro de broche de l'arduino
{2, 3, 4, 5} // numéro de pins de l'arduino sur lesquels sont branchés tous les multiplexeurs apellés mux S0, S1, S2,S3
};
Bounce button0 = Bounce(mux1.pin(7), 15);
Bounce button1 = Bounce(mux1.pin(8), 15);
Bounce button2 = Bounce(mux1.pin(9), 15);
Bounce button3 = Bounce(mux1.pin(10), 15);
Bounce button4 = Bounce(mux1.pin(11), 15);
Bounce button5 = Bounce(mux1.pin(12), 15);
Bounce button6 = Bounce(mux1.pin(13), 15);
Bounce button7 = Bounce(mux1.pin(14), 15);
Bounce button8 = Bounce(mux1.pin(15), 15);

int current_waveform=0;

extern const int16_t myWaveform[256]; // defined in myWaveform.ino

void setup() {
Control_Surface.begin();
Serial.begin(9600);
pinMode(mux1.pin(7), INPUT_PULLUP);
pinMode(mux1.pin(8), INPUT_PULLUP);
pinMode(mux1.pin(9), INPUT_PULLUP);
pinMode(mux1.pin(10), INPUT_PULLUP);
pinMode(mux1.pin(11), INPUT_PULLUP);
pinMode(mux1.pin(12), INPUT_PULLUP);
pinMode(mux1.pin(13), INPUT_PULLUP);
pinMode(mux1.pin(14), INPUT_PULLUP);
pinMode(mux1.pin(15), 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(0.5);
waveform2.amplitude(0.5);

current_waveform = WAVEFORM_TRIANGLE;
waveform1.begin(current_waveform);
}
mixer1.gain(0, 0.5);
mixer1.gain(1, 0.5);
CD74HC4067 mux4 = {
A2
, // Analog input pin
{2, 3, 4, 5} // Address pins S0, S1, S2};
};
void loop() {
Control_Surface.loop();
// Read the buttons and knobs, scale knobs to 0-1.0
button0.update();
button1.update();
button2.update();
button3.update();
button4.update();
button5.update();
button6.update();
button7.update();
button8.update();
int knob_1 = (float)analogRead(mux4.pin(7)) / 1023.0;
int knob_2 = (float)analogRead(mux4.pin(6)) / 1023.0;
int knob_3 = (float)analogRead(mux4.pin(5)) / 1023.0;
int knob_4 = (float)analogRead(mux4.pin(4)) / 1023.0;
int knob_5 = (float)analogRead(mux4.pin(3)) / 1023.0;
int knob_6 = (float)analogRead(mux4.pin(2)) / 1023.0;
int knob_7 = (float)analogRead(mux4.pin(1)) / 1023.0;
int knob_8 = (float)analogRead(mux4.pin(0)) / 1023.0;
int knob_1 = (float)analogRead(mux4.pin(8)) / 1023.0;
int knob_2 = (float)analogRead(mux4.pin(9)) / 1023.0;
int knob_3 = (float)analogRead(mux4.pin(10)) / 1023.0;
int knob_4 = (float)analogRead(mux4.pin(11)) / 1023.0;
int knob_5 = (float)analogRead(mux4.pin(12)) / 1023.0;
int knob_6 = (float)analogRead(mux4.pin(13)) / 1023.0;
int knob_7 = (float)analogRead(mux4.pin(14)) / 1023.0;
int knob_8 = (float)analogRead(mux4.pin(15)) / 1023.0;

float gain1 = (float)analogRead(mux4.pin(7)) / 1023.0;
float gain2 = (float)analogRead(mux4.pin(6)) / 1023.0;
float knob_3 = (float)analogRead(mux4.pin(5)) / 1023.0;
float knob_4 = (float)analogRead(mux4.pin(4)) / 1023.0;
float knob_5 = (float)analogRead(mux4.pin(3)) / 1023.0;
float knob_6 = (float)analogRead(mux4.pin(2)) / 1023.0;
float knob_7 = (float)analogRead(mux4.pin(1)) / 1023.0;
float knob_8 = (float)analogRead(mux4.pin(0)) / 1023.0;
float knob_1 = (float)analogRead(mux4.pin(8)) / 1023.0;
float knob_2 = (float)analogRead(mux4.pin(9)) / 1023.0;
float knob_3 = (float)analogRead(mux4.pin(10)) / 1023.0;
float knob_4 = (float)analogRead(mux4.pin(11)) / 1023.0;
float knob_5 = (float)analogRead(mux4.pin(12)) / 1023.0;
float knob_6 = (float)analogRead(mux4.pin(13)) / 1023.0;
float knob_7 = (float)analogRead(mux4.pin(14)) / 1023.0;
float knob_8 = (float)analogRead(mux4.pin(15)) / 1023.0;

AudioNoInterrupts();
// use Knob 1 to adjust the frequency of both waveforms
waveform1.frequency(100.0 + knob_1 * 900.0);
waveform2.frequency(100.0 + knob_1 * 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_TRIANGLE_VARIABLE;
Serial.println("Variable Triangle");
break;
case WAVEFORM_TRIANGLE_VARIABLE:
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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