Audio Adapter Troubleshooting

[Nobdy]

Somewhere between the Teensy (3.2) and the Audio Adapter, something has stopped working where I can no longer hear sound. I assume it is the audio adapter, but I'd like to get a better idea as to what the issue may be before I go out and spend $20 to fix it (ie: get a new one).

I'll start with what I think could possibly have caused an issue:
The only thing I can think of that I have done that could potentially cause a part to fail is, during a brief lapse in attention, I accidentally connected the audio adapter and the Teensy transposed by one. As opposed to the normal mapping of pins, this would have resulted in the following:

Teensy	Audio Adapter
GND	---
+3.3V	---
7	MEMCS
8	MOSI
10	BCLK
11	SDCS
12	MCLK
---	MOSI
23	+3.3V
22	LRCLK
21	TX
18	SCL
17	SDA
14	VOL
13	SCLK
---	RX

[tr]
I worry that this may have caused a short, unexpected/unpredictable voltages (given that GND/3.3V were not correctly mapped) or otherwise cause unexpected results causing the SGTL5000 chip to fail.

Below is a simple example sketch that has worked for me in the past and should be independent of wiring configuration, it also uses an LED, which is still working, so I know that, if there is an issue with the Teensy rather than the audio board, it is at least limited in scope.

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

// GUItool: begin automatically generated code
AudioSynthWaveform       waveform1;      //xy=415,314
AudioEffectEnvelope      envelope1;      //xy=617,310
AudioOutputI2S           i2s1;           //xy=865,324
AudioConnection          patchCord1(waveform1, envelope1);
AudioConnection          patchCord2(envelope1, 0, i2s1, 0);
AudioConnection          patchCord3(envelope1, 0, i2s1, 1);
AudioControlSGTL5000     codec;     //xy=877,265
// GUItool: end automatically generated code


int ledPin = 13;

// Helper function for converting MIDI note to frequency
float calcFreq(byte note){
  return (pow(2,(note-69)/12.0)*440);
}

// Handler function for MIDI note on
void OnNoteOn(byte channel, byte note, byte velocity)
{
  AudioNoInterrupts();
  waveform1.frequency(calcFreq(note));
  waveform1.amplitude(velocity/127.0);
  envelope1.noteOn();
  AudioInterrupts();
  digitalWrite(ledPin, HIGH);
}

// Handler function for MIDI note off
void OnNoteOff(byte channel, byte note, byte velocity)
{
  envelope1.noteOff();
  digitalWrite(ledPin, LOW);
}

void setup() {
  pinMode(ledPin, OUTPUT);

  AudioMemory(18); // Way more audio memory than needed
  codec.enable();
  codec.volume(0.45);
  waveform1.begin(0,0,WAVEFORM_SINE);

  usbMIDI.setHandleNoteOff(OnNoteOff);
  usbMIDI.setHandleNoteOn(OnNoteOn);

  envelope1.attack(9.2);
  envelope1.hold(2.1);
  envelope1.decay(31.4);
  envelope1.sustain(0.6);
  envelope1.release(84.5);

  digitalWrite(ledPin, HIGH);
  delay(1000);
  digitalWrite(ledPin, LOW);
  delay(1000);
}

void loop() {
  usbMIDI.read();
}

If nothing here is sufficient to declare it dead, I can provide more information or run some additional tests (I don't have an oscilloscope, though).

 

[PaulStoffregen]

I tested it here (out of curiosity...), like this:



I was able to upload the Guitar example while the Teensy was misaligned like this.

When I plugged it back in correctly, the guitar example played correctly. The Teensy and audio board both survived.