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  1. Sorry I never wrote back. Many distractions. I'm...

    Sorry I never wrote back. Many distractions. I'm going to revisit this soon, I think.
    I do not have a lot of free time at this point, so I will not try to use the AD5628 for audio, but it would be...
  2. Can I use (2) PT8211 audio boards on my Teensy 4?

    I'm looking for a way to get 4 channels of audio with Teensy Audio Library.
    I'm interested in the TDM solutions but I do not have the means of assembling a TDM pcb.

    Could I use two PT8211 boards...
  3. If I want to use digitalWriteFast(), do I need to...

    If I want to use digitalWriteFast(), do I need to use it with pinModeFast()?

    Thanks,
    Ben
  4. The PMOD interface is just wiring to the dac...

    The PMOD interface is just wiring to the dac chip. I did not make any effort to support the dac as an audio interface for the Teensy Audio Library. But now that I think about it, that would be fun. ...
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    This is part of a larger project using Teensy 4...

    This is part of a larger project using Teensy 4 and LC to control analog synthesizer circuits. The PAIA drum tone board provides the basic percussion sounds, and I am using the Teensy Audio Library...
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    LC documentation says, TPM0 - Controls PWM...

    LC documentation says,


    TPM0 - Controls PWM pins 6, 9, 10, 20, 22, 23. Used by AltSoftSerial library and PulsePosition library.
    TPM1 - Controls PWM pins 16, 17.
    TPM2 - Controls PWM pins 3, 4.
    ...
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    This uses the Audio Library on the DAC port. It...

    This uses the Audio Library on the DAC port.
    It uses a number of PWM pins and digital pins to control a PAIA drum tone board with vactrols added.

    const int numLeds = 6;
    int pwmLeds[numLeds] =...
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    here's the main INO file #include ...

    here's the main INO file


    #include <Audio.h>
    #include <MIDI.h>
    #include <SD.h>
    #include <SPI.h>
    #include <SerialFlash.h>
    #include <Wire.h>
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    Teensy LC + Audio Library + PWM?

    Hello All,

    tldr: Are some PWM pins timers mutually exclusive to the Teensy Audio Library on the LC?

    I can share some snippets when I get on my main laptop this afternoon.

    I wanted a...
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    Love this.

    Love this.
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    Congratulations, I saw the new Teensy MicroMod...

    Congratulations, I saw the new Teensy MicroMod board on SparkFun's website this morning. Being able to build a prototype using one processor and then swap out processors as an afterthought is kind of...
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    Uh, I guess my question is my answer. I'll solder...

    Uh, I guess my question is my answer. I'll solder my own grid. Then I will search the forum for demultiplexer solutions.
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    MIDI retrofit for dinosaur Casiotone

    Hi all,
    I was looking for a way to put an antique Casiotone MT-52 under midi control.
    The keyboard matrix is 6x9 for a 49 key instrument.
    If I were to add a bipolar transistor to each switch...
  14. I don't know why I did not ask this before, but...

    I don't know why I did not ask this before, but is there an example of how to set up SPI with the SD library?
    How do I override the SPI settings the SD library uses?
    Thanks,
    Ben
  15. I will add something to this thread, the obvious...

    I will add something to this thread, the obvious detail I missed. PWM timers will interfere with SPI.
    I tend to use a lot of PWM to generate analog signals. The PWM timer chart given here...
  16. Using Teensy LC stand-alone with Audio Library

    It's amazing to me I can use some features of the Teensy Audio Library with the Teensy LC.
    I am trying to use it stand-alone (no outboard DAC).
    I actually do not need the DAC output. But, I must...
  17. I wanted to follow up on this. I was using an OLD...

    I wanted to follow up on this. I was using an OLD fork of the Adafruit 1306 driver.
    By switching to the new driver, adding the huge capacitor as recommended here, and ensuring I passed in the...
  18. Another note. When I use the Teensy LC with...

    Another note. When I use the Teensy LC with Teensy Audio Library, I must use the Teensy LC 1-channel DAC.
    This DAC gets clobbered when I change PWM frequency. When that happens, the Teensy Audio...
  19. Interesting. It just shows how easily I can...

    Interesting. It just shows how easily I can ignore a problem if I am busy with another problem. I will watch this thread.
  20. I have seen this too. Generally it seems more...

    I have seen this too.
    Generally it seems more stable when I do not use a hub with various other usb peripherals.
  21. (What always happens is, I start out with the...

    (What always happens is, I start out with the Teensy LC on a project, and it works decently! But then I want a few more IO pins, and then I want an SD reader to save presets... Slippery slope of...
  22. A follow-up to this thread. This morning I was...

    A follow-up to this thread. This morning I was able to initialize the code used above in a Teensy LC to make my LC a dedicated envelope chip. For now I am using a Cat Skull TeensyBoy board as a quick...
  23. Really quite off-topic observation, and why I love the Teensy.

    Too off-topic. Please remove this post.
  24. hm I don't remember what I did but I'm using the...

    hm I don't remember what I did but I'm using the freeverb all the time now and it's good... my code looks perfunctory
    the reverb at the very end of the mix

    24540
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    Thanks for sharing this. I have the MAX11300...

    Thanks for sharing this.
    I have the MAX11300 evaluation board.
    I would love to try pixi library.
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    I'll be watching this space.

    I'll be watching this space.
  27. Text-To-Speech as Teensy Audio Lib component?

    Just a thought. Are any of the TSS libraries possibly portable to Teensy Audio Library as a "synth" component?
    Being able to generate speech/singing and put it into the audio graph would be kind of...
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    Thanks, PaulStoffregen! I have been thinking...

    Thanks, PaulStoffregen!

    I have been thinking about using various USB MIDI controllers directly with Teensy Audio projects (pads, mixing surfaces). This looks like a green light.
    BTW, if I wanted...
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    AWESOME. I get it. Much thanks.

    AWESOME. I get it.
    Much thanks.
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    ??? ahhh that is what I am missing... usb !=...

    ??? ahhh that is what I am missing... usb != usbhost ?
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    Thanks! I guess what I am trying to understand...

    Thanks!
    I guess what I am trying to understand is, is there any functional difference between "MIDI over USB" and "MIDI over USB via USB HOST"?
    I made a Teensy drum machine and I have USB MIDI...
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    T4 Using USB Host with MIDI?

    Hello!

    I have a Teensy USB Host adapter, and I have a Waldorf Blofeld with USB Midi support.
    I am working on a MIDI Controller made especially for all the knobs in a Blofeld. It would be nice to...
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    Suddenly qwiic peripherals seem more interesting.

    Suddenly qwiic peripherals seem more interesting.
  34. Lovely machine!

    Lovely machine!
  35. What is CPU/Memory usage like on this? Do we see...

    What is CPU/Memory usage like on this? Do we see a polysynth using this? Or more like one teensy in a eurorack module?
  36. No, sorry, I did not know this was not a known...

    No, sorry, I did not know this was not a known issue. I am using Big Sur (I think). When I changed the board manager to use Teensy 4, the loader came up on compile. Seems like something got stuck...
  37. I had to rollback the beta Teensyduino before I...

    I had to rollback the beta Teensyduino before I could test it with the Teensy 4, because I could not compile my project for the LC with that beta.
    (Also, noticed Teensy Loader would not launch.)
    I...
  38. ...where do I download beta Teensyduino? oh, I see

    ...where do I download beta Teensyduino? oh, I see
  39. Will do, thank you!

    Will do, thank you!
  40. Hardware Differences LC vs 4.0, SPI, I2C and decisions to make

    Hello,

    I am working on a hobby project using I2C for an OLED display and SPI for an SD card reader plus 3 digital potentiometers.

    For the Teensy 4, the SD reader does not initialize. It's one...
  41. The display no longer has pixel drift, but runs...

    The display no longer has pixel drift, but runs slower. I tried 2.2K pull-up resistors. Maybe something a little bigger.
  42. Frank B, Wow, that improved things. I'll need...

    Frank B,

    Wow, that improved things. I'll need to determine optimal values.

    Thanks!
  43. Teensy LC and Adafruit_SSD1306 via 12C? Weird scrolling

    I'm seeing some weird scrolling using the Adafruit_SSD1306 (with 128x32 OLED Display) with I2C on my Teensy LC. (Never mind how slow this runs on the LC)
    It seems like there's a small offset error...
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    Nope, itís just a voltage issue on the cheap card...

    Nope, itís just a voltage issue on the cheap card reader. Done.
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    One final question on this thread. I am trying...

    One final question on this thread.
    I am trying to use an SPI SD card reader. One of those really cheap, one-bit ones. It works on my Uno.

    I am trying to use Teensy 4 pin 14 for CS. The test...
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    Hah! Never mind my comments. I can't help myself....

    Hah! Never mind my comments. I can't help myself. The truth is this kind of development is the Wild West, and I would not have it any other way. I like figuring out how to get multiple devices to...
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    Wow. I really like the transaction/settings API.

    Wow. I really like the transaction/settings API.
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    Seems like libraries need to do a little more to...

    Seems like libraries need to do a little more to support multiple spi devices. Like, my program opens up SPI, and then I ask each SPI device library for their respective settings. Then I get to...
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    SPI: is it a Singleton?

    Hello!

    I see my Teensy has multiple sets of SPI pins. Can I run SPI on more than one set of pins simultaneously?
    The documentation suggests no. It seems SPI is a "Singleton": One instance per...
  50. Should I try that branch for myself, or wait for...

    Should I try that branch for myself, or wait for a pull request/merge?
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