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    I've never done this and I'm not really sure how...

    I've never done this and I'm not really sure how MTC actually works at a low level. However, I can say that using this library you will be able to derive the incoming time code. I did a quick google...
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    Ok, I'm a bit stymied here. Based on the official...

    Ok, I'm a bit stymied here. Based on the official combinations in output_i2s_quad.cpp (7 and 32, 32 and 9, or 9 and 6) it would appear the the two output channels need to be consecutive. This may be...
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    Well, I finally had enough time to play with...

    Well, I finally had enough time to play with this!

    I started out by testing both hex and quad output with a simple sine wave object feeding them. That all worked well. Then I started hacking...
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    Ah, thank you very much Paul! So based on this...

    Ah, thank you very much Paul!

    So based on this I'm seeing 4ma? Am I reading that right?

    Thank you!
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    I'm running out of pins... Yes I could go to...

    I'm running out of pins...

    Yes I could go to the Teensy 4.1, or I could use the backside pins on the T4.0, but I'd like to try solving this another way. So, some questions...

    On the ST7735...
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    Teensy 4.0 Pin Current Capability

    Hi all,

    I can't seem to find a reliable answer for the current capability (source/sink) of the I/O pins on the Teensy 4.0.

    I thought that info would be in here:
    ...
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    Semi-related question - Kurt, am I able to use a...

    Semi-related question - Kurt, am I able to use a different pin for D/C (other than pin 9)? I might need that for I2S audio...

    Thank you!
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    Just an update. I left one of the working...

    Just an update. I left one of the working displays for a couple days, and when I powered up my test setup today, it didn't work. I swapped to my other working display and...nothing again. I'm...
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    Teensy 4.0 Alternate I2S Pins

    Hi all,

    I'd love a double check on this. I've been spending a bit of time learning about I2S on the Teensy 4.0. I understand that there are a maximum of 5 pins can can do I2S. I'm looking at going...
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    I'm starting to switch to VSCode with PlatformIO....

    I'm starting to switch to VSCode with PlatformIO. Still early in the transition as I'm working on a few things and haven't had time to properly dive in.

    Agreed on the usefulness of the plotter....
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    Great thought! I gave it a try but no dice. I...

    Great thought! I gave it a try but no dice. I couldn't get the actual LCD off the board, so I started closely inspecting the module. There appear to be 5 diodes (D1-5, you can see them in this photo:...
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    Here's the latest! It looks like of the 5...

    Here's the latest!

    It looks like of the 5 modules I have, only 2 are working. When I started I must have grabbed a bad one, then when I grabbed another to double check, it was also bad. Luckily...
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    Hi Kurt, Yep, I moved to a Teensy 3.2 as I...

    Hi Kurt,

    Yep, I moved to a Teensy 3.2 as I knew I had that exact setup working with an ST7735.

    So interestingly, I grabbed another LCD randomly from the pile, and this one worked. I'm working...
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    Still plugging away at this. Haven't had time to...

    Still plugging away at this. Haven't had time to solder up shorter wires, but I will hopefully do that soon. I did jump back a few steps to double check myself. I went back to a Teensy 3.2, and ran...
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    Thanks for trying it out, I appreciate it. I gave...

    Thanks for trying it out, I appreciate it. I gave your version a try but still no love here. The only modification I made was to the reset pin definition.

    I'm going to rewire everything tomorrow...
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    Hi Kurt! Thanks for the confirmation that my...

    Hi Kurt!

    Thanks for the confirmation that my pin choice was ok. I do have pin 0 connected to the reset pin, I also tried pin 1 just in case. I wasn't sure if there were limitations on the DC and...
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    Teensy 4.0 and ST7789_t3

    Hi all,

    I'm trying my first ST7789 based LCD (320x240) with a Teensy 4.0 and I'm having a bit of trouble getting it to work. This is a generic LCD, nothing fancy. So far I've been unable to get...
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    Ok, I have done some tests, and here are my...

    Ok, I have done some tests, and here are my results!

    Since I have the two Teensys connected to two computers, I left DEBUG defined on both so I could get the serial output. When running both with...
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    Apologies for the delay, but I am back and...

    Apologies for the delay, but I am back and sorting through things. I will try out that code as soon as I can. I'm hoping this eliminates the SPDIF hardware as the culprit and perhaps makes me focus...
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    Not a rush, I'm slammed this weekend and won't...

    Not a rush, I'm slammed this weekend and won't have time to test anything until Monday at the earliest. It wouldn't surprise me if this was something on my end.

    What you're describing was...
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    Nah, not only two connections but I wanted to...

    Nah, not only two connections but I wanted to clean up the wiring, get everything as short as possible to eliminate issues there, etc. I guess "tearing it apart" sounds a bit more intense than it...
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    Sounds good. I am going to try tearing...

    Sounds good.

    I am going to try tearing everything apart and starting again. Do you have any recommendations for the links between the two Teensys? Should I connect out->in directly, or put in a...
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    I did a bit more experimenting this morning. I...

    I did a bit more experimenting this morning. I still can't get the startup distortion to reappear. I'll keep trying to see if I can characterize that one better.

    On to the return path issue. I...
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    I agree that it's weird i can't reproduce it....

    I agree that it's weird i can't reproduce it. I'll try again in the morning to see if the computer it more likely to make it happen after having slept awhile. Honestly I have no idea why that would...
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    Sounds good, I'm happy to follow any...

    Sounds good, I'm happy to follow any troubleshooting plan you're thinking of.

    You are correct on the setup. The noise/distortion is present when I first connect the sending Teensy. It persists...
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    I hope I am able to explain this all clearly. ...

    I hope I am able to explain this all clearly.

    I reverted to using spdif3 for transmit and spdif3_async for receive. I added the two tests you asked (more info later).

    I started with just the...
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    Hi there, Thanks for the reply! I tried...

    Hi there,

    Thanks for the reply!

    I tried altering the anti-aliasing attenuation but I have the same issue. I added the debug code you had in the example file, and here is a sample of the output:...
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    Well, I just had a bit of a disappointing test. I...

    Well, I just had a bit of a disappointing test. I took two Teensy 4.0 boards, connected SPDIF in on one to SPDIF out on the other, and vice versa. I also connected ground together.

    Here's the...
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    Thank you for the quick reply, and for reminding...

    Thank you for the quick reply, and for reminding me of a few things!

    I completely spaced on the DAC thing, my mistake there. I can dispense with that part.

    I didn't realize that SPDIF on these...
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    Audio Block Compatibility

    Hi all,

    I am planning on migrating my project to the Teensy 4, mostly for more power and greater flexibility with some interfaces.

    I'm trying to double check if various blocks will play nicely...
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    Just a quick update before I head to bed. I've...

    Just a quick update before I head to bed. I've been hacking away at these issues, and I've made a bit of progress.

    I've been working with @gfvalvo's BCLK = 64*Fs I2S blocks (available here:...
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    My issue was just that I was looking for...

    My issue was just that I was looking for documentation. speed12 pointed me the right way, so my current issue is solved.
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    I should also mention that the system works fine...

    I should also mention that the system works fine when taking in audio through the audio board or through USB on the primary Teensy. It worked taking in audio from the secondary USB yesterday, but...
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    I2S Timing Issues

    Hi all,

    I'm working on a project and seeing a weird intermittent problem. I'm trying to learn more about why it's happening so I can figure out a solution or at least a work around.

    This is a...
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    @speed12 Ah thank you very much, that does help!!!

    @speed12 Ah thank you very much, that does help!!!
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    PlatformIO Config Options

    Hi all,

    I'm starting to play around with PlatformIO, and one thing I haven't found yet are the list of specific Teensy related platformio.ini options. For instance, I have been using USB Audio a...
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    An interesting idea. I will have to experiment...

    An interesting idea. I will have to experiment with it further. Though at one point I had pared things down to three objects and two patch cords, while only trying to change one of them. It still...
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    A bit of further info: Adding the following...

    A bit of further info:

    Adding the following code to the start causes the above code to fail:



    AudioInputAnalogStereo adcs1; //xy=214,270
    AudioMixer4 mixer1; ...
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    Dynamic Audio Connection Bug?

    Hi all,

    A while back I looked into creating dynamic patch cords to connect audio components. I wrote a simple test program that took USB audio in, connected it directly to line out, then swapped...
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    That did it, THANK YOU! Now to continue on...

    That did it, THANK YOU!

    Now to continue on breaking my code, but with working hardware...

    Thank you again!
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    To be clear, I don't think anything is...

    To be clear, I don't think anything is unsoldered. The USB cable came out of the connector, that's all.

    Thanks!
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    Dead Teensy 3.2

    Hi all,

    I was just in the middle of uploading some code to a Teensy 3.2 when the cable came loose. The unit no longer seems to show up in Windows or OSX.

    Any chance of reviving this, or is it...
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    Ok, thank you for confirming my understanding. ...

    Ok, thank you for confirming my understanding.

    Interestingly, the Adafruit module uses 10K pullups. I'll stick with 2.2K, it's what Paul uses on the audio board. Thank you for the app note, I'll...
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    Ah of course, I wasn't thinking of that. Thank...

    Ah of course, I wasn't thinking of that. Thank you for the reminder!

    I've been testing with one of the Adafruit Mini 0.8" matricies (https://www.adafruit.com/product/870). This board has pullups...
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    Hi Morgan, thanks for the reply. Yep, you've...

    Hi Morgan, thanks for the reply.

    Yep, you've got the scenario right. The 5V side has a seven segment display and some indicator LEDs, but no analog. Any analog is on the audio board and thus run...
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    Audio Board I2C Voltage Shift?

    Hi all,

    I have a small test setup with a Teensy 3.2, and audio board, and an HT16K33 based LED matrix. Everything is connected via I2C, and it works great. I just realized that the matrix is...
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    It's on my list to try. I hadn't done it since I...

    It's on my list to try. I hadn't done it since I wasn't sure if there was a technical reason Paul hadn't done it officially.
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    Power Sharing Between Two Sources

    Hi all,

    I am working on a project with two Teensys. In regular operation either or both of them will have power coming through their USB ports. If only one is powered, regardless of which one it...
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    Well, I had a look. As of August 2015, all of...

    Well, I had a look. As of August 2015, all of those values were 15 in output_i2s.cpp, including I2S_RCR5_FBT. The rest of the settings appear the same I believe. I tried going back to 15 on FBT but...
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    Ah, great idea. I will check that out this...

    Ah, great idea. I will check that out this afternoon!

    Is there a technical reason that i2s_quad hasn't gone to a ratio of 64 yet on the 3.x series? Or is it just that it's lower on the priority...
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