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  • shawn's Avatar
    01-09-2021, 05:02 PM
    Ok, I think I understand what's going on, now. @luni that link helped, thanks. Fact: The `printf` family of functions need a `_write` function defined somewhere (this is how the current libraries do it, at...
    6 replies | 1126 view(s)
  • shawn's Avatar
    01-09-2021, 05:41 AM
    I'll add another interesting detail: The code compiles and operates fine for Teensy 3 with the Teensyduino IDE but not with PlatformIO. With PlatformIO, it complains of the missing `_write`. Maybe PlatformIO is doing...
    6 replies | 1126 view(s)
  • shawn's Avatar
    01-08-2021, 09:27 PM
    I should add: This works for Teensy 4 compilation but not for earlier versions, as the original poster stated about the unresolved reference to `_write`.
    6 replies | 1126 view(s)
  • shawn's Avatar
    01-08-2021, 04:54 AM
    I wanted this same behaviour and found that this works for me, to replace `stdout`: stdout = fwopen(&Serial, (void *cookie, const char *buf, int count) { return reinterpret_cast<Print *>(cookie)->write(buf,...
    6 replies | 1126 view(s)
  • shawn's Avatar
    12-24-2020, 02:26 AM
    https://forum.pjrc.com/threads/63231-FastLED-with-Teensy-4-1-fast-parallel-DMA-output-on-any-pin] Maybe some will find this useful. I've attached a FastLED controller () that uses DMX to output pixels. Specify the...
    0 replies | 99 view(s)
  • shawn's Avatar
    12-22-2020, 08:41 PM
    Thanks, @PaulS. I just released TeensyDMX v4.1.0 and it works fine on the Teensy 4. I tested send, receive, and RDM. It should also be able to retransmit as you wish, per your question above. There's actually two...
    2 replies | 293 view(s)
  • shawn's Avatar
    12-22-2020, 07:55 PM
    I just released TeensyDMX v4.1.0: https://github.com/ssilverman/TeensyDMX/releases/tag/v4.1.0 Changes since v4.1.0-beta.2: 7- and 9-bit format support when using serial parameters to accomplish BREAK and MAB...
    17 replies | 1314 view(s)
  • shawn's Avatar
    12-22-2020, 07:49 AM
    Check out some of the examples with TeensyDMX. It’s accessible through the Arduino IDE (or Teensyduino); just search for “TeensyDMX” in the Library Manager (v4.1.0-beta.2 is the current, but v4.1.0 will appear very...
    3 replies | 261 view(s)
  • shawn's Avatar
    12-07-2020, 03:47 AM
    Released TeensyDMX v4.1.0-beta.2 with a few fixes: https://github.com/ssilverman/TeensyDMX/releases/tag/v4.1.0-beta.2 The changes: Fixed NativeEthernet interoperability by changing from a custom use of the PIT...
    17 replies | 1314 view(s)
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About shawn

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About shawn
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Oakland, CA, USA
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Electrical/Power/Software Engineer, LED artist

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Quick Guide: Using printf() on Teensy ARM 01-09-2021 05:02 PM
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03-24-2017