I2S input -> Mixer <- playSDWav: should that be possible?

[cdouglass]

I'm in the process of building an audio loop station as my final school project and I've hit a snag.
I have a stereo source going to the audio inputs of an audio shield on a Teensy 3.6, and audio files on the card. I'm just at the point where I'm trying to get audio to come through from both the input and the SD card simultaneously, but I can't seem to make that happen. SD audio comes across fine, but I2S inputs does not. I've duplicated the I2S setup in a separate sketch and it works fine, but as soon as the playSdWav is added, the I2S input stops working.

Here's my current (scaled down) test that is not working:

// A test for input controls to AudNauseum


#include <Bounce.h>
#include <Encoder.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

// Use these with the Teensy 3.5 & 3.6 SD card
#define SDCARD_CS_PIN    BUILTIN_SDCARD
#define SDCARD_MOSI_PIN  11  // not actually used
#define SDCARD_SCK_PIN   13  // not actually used

// GUItool: begin automatically generated code
AudioInputI2S            i2s1;           //xy=78,48
AudioPlaySdWav           playSdWav2;     //xy=79,214
AudioPlaySdWav           playSdWav1;     //xy=81,159
AudioMixer4              mixer1;         //xy=398,157
AudioOutputI2S           i2s2;           //xy=649,128
AudioConnection          patchCord1(i2s1, 0, mixer1, 2);
AudioConnection          patchCord2(i2s1, 1, mixer1, 3);
AudioConnection          patchCord3(playSdWav2, 0, mixer1, 1);
AudioConnection          patchCord4(playSdWav1, 0, mixer1, 0);
AudioConnection          patchCord5(mixer1, 0, i2s2, 0);
AudioConnection          patchCord6(mixer1, 0, i2s2, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=421,496
// GUItool: end automatically generated code




Encoder selector(25, 26);

Bounce rotaryButton = Bounce(24, 15);
Bounce shiftButton = Bounce(27, 15);
Bounce recButton = Bounce(28, 15);
Bounce playButton = Bounce(29, 15);
Bounce stopButton = Bounce(30, 15);
Bounce metButton = Bounce(31, 15);
Bounce addRemButton = Bounce(32, 15);
Bounce newButton = Bounce(33, 15);
Bounce soloButton = Bounce(34, 15);
Bounce fxButton = Bounce(35, 15);
long selectorPosition = 0;

void setup() {

  Serial.begin(9600);
  AudioMemory(8);
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.9);
  sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN);
  sgtl5000_1.micGain(36);
  SPI.setMOSI(SDCARD_MOSI_PIN);
  SPI.setSCK(SDCARD_SCK_PIN);
  if (!(SD.begin(SDCARD_CS_PIN))) {
    while (1) {
      Serial.println("Unable to access the SD card");
      delay(500);
    }
  }
  
  pinMode(13, OUTPUT); // LED on pin 13
  pinMode(24, INPUT_PULLUP);
  pinMode(27, INPUT_PULLUP);
  pinMode(28, INPUT_PULLUP);
  pinMode(29, INPUT_PULLUP);
  pinMode(30, INPUT_PULLUP);
  pinMode(31, INPUT_PULLUP);
  pinMode(32, INPUT_PULLUP);
  pinMode(33, INPUT_PULLUP);
  pinMode(34, INPUT_PULLUP);  
  pinMode(35, INPUT_PULLUP);  
  mixer1.gain(0, 0.25);
  mixer1.gain(1, 0.25);
  mixer1.gain(2, 0.25);
  mixer1.gain(3, 0.25);
  delay(1000);
}

int filenumber = 0; //while file to play
const char * filelist[4] = { "00000003.wav", "00000004.wav"};
  
elapsedMillis blinkTime;

void loop() {

    if (playSdWav1.isPlaying() == false) {
    const char *filename = filelist[0];
    Serial.print("Start playing ");
    Serial.println(filename);
    playSdWav1.play(filename);
    delay(10); // wait for library to parse WAV info
  }

  if(playSdWav2.isPlaying() == false) {
    const char *filename = filelist[1];
    Serial.print("Start playing ");
    Serial.println(filename);
    playSdWav2.play(filename);
    delay(10);
    }
  
  // blink the LED without delays
  if (blinkTime < 250) {
    digitalWrite(13, LOW);
  } else if (blinkTime < 500) {
    digitalWrite(13, HIGH);
  } else {
    blinkTime = 0; // start blink cycle over again
  }

  // read selector

  long newSelectorPosition = 0;
  newSelectorPosition = selector.read();
  if(newSelectorPosition != selectorPosition){
      selectorPosition = newSelectorPosition;
      Serial.print("SELECTOR VALUE: ");
      Serial.println(selectorPosition);
    } 
  
  
  // read pushbuttons
  
  rotaryButton.update();
  if(rotaryButton.fallingEdge()){
    Serial.println("ROTARY BOOP");
  }
  
  shiftButton.update();
  if (shiftButton.fallingEdge()) {
    Serial.println("SHIFT BOOP");
  }
  playButton.update();
  if (playButton.fallingEdge()) {
    Serial.println("PLAY BOOP");
  }

  recButton.update();
  if(recButton.fallingEdge()){
      Serial.println("REC BOOP");
    }
    
  stopButton.update();
  if(stopButton.fallingEdge()){
      playSdWav1.stop();
      Serial.println("STOP BOOP");
  }

  metButton.update();
  if(metButton.fallingEdge()){
      Serial.println("MET BOOP");
    }

  addRemButton.update();
  if(addRemButton.fallingEdge()){
      Serial.println("ADD/REM BOOP");
    }

  newButton.update();
  if(newButton.fallingEdge()){
      Serial.println("NEW BOOP");
    }

  soloButton.update();
  if(soloButton.fallingEdge()){
      Serial.println("SOLO BOOP");
    }
  fxButton.update();
  if(fxButton.fallingEdge()){
      Serial.println("FX BOOP");
    }

}

Do I need to be checking something in the loop to keep the I2S input active?

 

[WMXZ]

as I2S uses PIN13 for data input, you mast use Pin14 as alternate SPI_CLK (Assume you are using T3.x)

 

[cdouglass]

Thank you!