Audio Board Problems: intermittent pauses

[tirandagan]

Folks,

I have accumulated several questions about the audio card and audio library which I am consolidating into a single thread. I have noticed that the questions I have reflect issues others have asked in other threads (which were left unanswered) so feel comfortable this is not duplicative.

I am building a sub simulator for my 9 year old:

https://developer.ibm.com/recipes/tu...ine-simulator/

I am attaching an "architectural design" document so you can see where I am so far with the build (and connections to the teensy)
View attachment 13494

Here are a few problems I am having:

1. Intermittent audio glitches playing a Wav 2 from SD:

After the main setup, I start playing out a 3 minute WAV file from the SD card (using the audio controller SD or the Teensy SD do not fix my issue). I loop this file (re-reading it or reading another sound file after it finishes). However every 30s - 2 minutes I get a "glitch", the entire code seems to halt/pause and then continue. I am attaching a audio recording of this artifact:

View attachment Distortion.zip

My SD card is SDHC and when I ran the SD test , the worst SDblock time was 5.08ms (when reading 4 files at once) at 175.23% of audio frame time. I switched to SD_t3 but unfortunately this breaks the SdCardTest app so I only have the values from the traditional SD library. I am running my app, however, with TD_t3 by uncommenting the #define USE_TEENSY3_OPTIMIZED_CODE in line 35 of SD.h

I have the following libraries invoked by my code:

#include <SD.h>
#include <Adafruit_SSD1306.h>
#include <Led7Segment.h>
#include <Grove_LED_Bar.h>
#include <SparkFunSX1509.h> // Include SX1509 library
#include <Audio.h>

I also added memory usage code and am seeing an average of 30-38% except when this hiccup occurs. At that point the max mem usage jumps from 101% to 180%. I tried setting AudioMemory(50) with not effect.

Before I add more source code - any initial thoughts what could be causing this? I suspect some interrupt conflicts but after adding lots of debug lines I see this happens in random points in the code and random points in the music tracks.

Finally, here's the audio configuration I am running:

// GUItool: begin automatically generated code
AudioPlaySdWav           musicTrack;     //xy=87,134
AudioPlaySdWav           effect1;     //xy=89,236
AudioMixer4              mixerL;         //xy=317,118
AudioMixer4              mixerR;         //xy=321,251
AudioOutputI2S           audioOutput;           //xy=512,219.7142791748047
AudioConnection          patchCord1(musicTrack, 0, mixerL, 0);
AudioConnection          patchCord2(musicTrack, 1, mixerR, 0);
AudioConnection          patchCord3(effect1, 0, mixerL, 1);
AudioConnection          patchCord4(effect1, 1, mixerR, 1);
AudioConnection          patchCord5(mixerL, 0, audioOutput, 0);
AudioConnection          patchCord6(mixerR, 0, audioOutput, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=180,507
// GUItool: end automatically generated code

2. Once I figure out the problem above, I would like to accomplish a few more things:

a. Load an SD Wave file into memory and then...playmem - so I can loop in memory without noise when repeating
b. Control the pitch of the wav sound file (make it sound higher/lower in pitch)

 

[Teenfor3]

Maybe I am missing something here but the code I get from the GUI for your config is as below.......
This code on its own wont do anything, you need to post what you are telling it to do, and that is probably the bits of code that are giving you trouble

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

// GUItool: begin automatically generated code
AudioPlaySdWav           MusicTrack;     //xy=155,289
AudioPlaySdWav           effect1;     //xy=165,423
AudioMixer4              mixerR;         //xy=408,435
AudioMixer4              mixerL;         //xy=410,303
AudioOutputI2S           audioOutput;           //xy=621,370
AudioConnection          patchCord1(MusicTrack, 0, mixerL, 0);
AudioConnection          patchCord2(MusicTrack, 1, mixerR, 0);
AudioConnection          patchCord3(effect1, 0, mixerL, 1);
AudioConnection          patchCord4(effect1, 1, mixerR, 1);
AudioConnection          patchCord5(mixerR, 0, audioOutput, 1);
AudioConnection          patchCord6(mixerL, 0, audioOutput, 0);
AudioControlSGTL5000     sgtl5000_1;     //xy=419,543
// GUItool: end automatically generated code

 

[Teenfor3]

........from above........and that is probably the bits of code that are giving you trouble...........and you need to use AudioNoInterrupts etc to make sure your code does not upset the timing of things