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  1. No this is very helpful. I haven't tried the...

    No this is very helpful. I haven't tried the other I2C ports so will test them out too as well as your other suggestions.

    For 2), the Portenta I2C through the breakout board is 3.3v and is using...
  2. Not a problem and happy to elaborate. I'm...

    Not a problem and happy to elaborate.

    I'm using an Arduino Portenta as the Master on an I2C bus with all the other devices as Slave one of which is this Teensy setup. The bus runs at 3.3V as all...
  3. No, I don't see the same issue occuring with the...

    No, I don't see the same issue occuring with the samples. I am realising there is something in the program written, i just can't understand what might be causing it though.

    Specifically why would...
  4. While I can't share the software (unreleased...

    While I can't share the software (unreleased project i'm contributing to), the odd thing is that has occured across two shields only when using I2C in slave. When using the serial pins or just USB,...
  5. Good question, The shield is mounted...

    Good question,

    The shield is mounted underneath with/without the Sparkfun I2C shield in between (I’ve isolated it from the test and it appears to not be a factor)

    The increase in temp happens...
  6. Loss of Audio Shield Rev D due to Overheating

    Hi everyone,

    I've got a overheating issue occuring that resulted in the loss of two Audio Shields Rev D and the issue is difficult to reproduce.

    Using the teensyDuino 1.57 on a TeensyBoard 4.1...
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    @PaulSoffregen I switched to the Richard-Gemmell...

    @PaulSoffregen I switched to the Richard-Gemmell I2C and repointed the Audio.h libraries to that instead of Wire and this has restored I2C connectivitiy while using I2S Output
    ...
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    @PaulSoffregen, I'm stumped as to why this is...

    @PaulSoffregen, I'm stumped as to why this is happening. Board responds to I2C commands when the AudioOutput is PWM or others but not I2S.

    On Teensy 4.1 with Audio Shield

    #include <Audio.h>...
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    This line appears to be conflicting with the I2C...

    This line appears to be conflicting with the I2C onRecieve

    AudioOutputI2S i2s2;
    If i comment it out, the I2C works but if I put it in, it prevents the communication.

    Teensy as Slave Code
    ...
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    @PaulSoffregen it's worth noting that I still get...

    @PaulSoffregen it's worth noting that I still get more errors than other boards but it is massively reduced when shielding the wires and removing nearby potential interference.
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    Update: I think it is safe to say this is a...

    Update: I think it is safe to say this is a user/hardware issue not a software/firmware issue.

    I replaced the I2C cables and rewired with untwisted cables between the I2C shields and it is...
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    @tonton81 Switched it over and repeated the test...

    @tonton81 Switched it over and repeated the test but got the same results :(

    Also I tested directly with Sparkfun I2C shield and same results. Works great as the master, horrible as the slave.
    ...
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    Hi Paul, Updated to 1.57 and still no luck. ...

    Hi Paul,

    Updated to 1.57 and still no luck.

    Test setup is msg#1 with the Portenta as the "Master" Script above and the teensy with "Slave" Script. i've attached an image of the teensy on the...
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    @PaulSoffregen I2C is running ok however I'm...

    @PaulSoffregen I2C is running ok however I'm getting a lot of bad character read and transmission. I've isolated and tested with Teensy 4.1 and other boards in identical configuration however while...
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    I've added the updated Wire library with the core...

    I've added the updated Wire library with the core update. It looks to be working as planned and I have not required the work around library at all :) This has made using the Audio Library now...
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    Awesome, thanks for the heads up. I'll definitely...

    Awesome, thanks for the heads up. I'll definitely update to 1.57 when it's ready.
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    I realised that Teensy 4.1 with Wire library does...

    I realised that Teensy 4.1 with Wire library does not work as expected.

    Switched to using the following worked in replacement of the wire library on the slave teensy.
    ...
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    Teensy 4.1 I2C to Arduino Portenta

    Hi, long time reader, first time poster.

    I purchased a Teensy 4.1 with Audio Shield a while ago and it has been perfect. I recently set it up to accept I2C commands from an Arduino Portenta...
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