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    I've added this to my list of bugs to fix.

    I've added this to my list of bugs to fix.
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    Here is the info where Arduino is considering...

    Here is the info where Arduino is considering trying this.

    https://github.com/arduino/Arduino/pull/10234

    Sorry, been really busy here. Haven't had time to try cobbling together a test copy...
  3. But the only electrical spec about the amount of...

    But the only electrical spec about the amount of hysteresis is only in the part about I2C pins. So hard to know....
  4. Figure 10-5 in the ATMEGA32U4 datasheet seems to...

    Figure 10-5 in the ATMEGA32U4 datasheet seems to say all the digital inputs have schmitt trigger.

    20303
  5. Are there forum threads or blog posts I can use...

    Are there forum threads or blog posts I can use for links?
  6. I've learned the hard way about publishing...

    I've learned the hard way about publishing documentation on the main website for new features before or during beta testing. That's why I'm working now to get all the documentation updated for the...
  7. Have you considered adding a library.properties...

    Have you considered adding a library.properties file, and submitting it to Arduino for inclusion in the library manager?

    Details here, under "How can I add my library to Library Manager?"
    ...
  8. As a quick check, try running the Wire library's...

    As a quick check, try running the Wire library's Scanner example.

    Does it correctly detect when the BNO055 is disconnected?
  9. If you're familiar with serial MIDI on Arduino...

    If you're familiar with serial MIDI on Arduino Mega, one minor detail that commonly comes up is the need for different resistors with 3.3V signals. Details here:
    ...
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    Pretty sure you didn't select Triple Serial...

    Pretty sure you didn't select Triple Serial (which is the *only* way that works). I tried it here as a quick sanity check. It definitely does work. Here's a screenshot where you can see clicking...
  11. Use SD.begin(BUILTIN_SDCARD) to cause the SD...

    Use SD.begin(BUILTIN_SDCARD) to cause the SD library to access the SD socket on Teensy 4.1.

    The comments in all the SD library examples mention this only for Teensy 3.5 and 3.6. I've committed an...
  12. Did you buy it directly from PJRC? If so, send...

    Did you buy it directly from PJRC? If so, send Robin an email with your 6 digit order number in the subject. Or just reply to the messages you received while ordering, which have that order number....
  13. I recently learned these PSRAM chips are actually...

    I recently learned these PSRAM chips are actually made by AP Memory. Their part number is APS6404L-3SQR-SN.

    http://www.apmemory.com/html/product_psram.php

    But buying the AP Memory chips seems...
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    Yes, a lot of work indeed. I will look at trying...

    Yes, a lot of work indeed. I will look at trying this in a couple days.
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    Awesome. I gave it a quick shout-out on Twitter....

    Awesome. I gave it a quick shout-out on Twitter. ;)
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    Generally speaking, it's fine to use the other...

    Generally speaking, it's fine to use the other pins, as long as you add the necessary software to do so. But I hope you can understand my reluctance to specifically recommend changes we haven't...
  17. With PWM, up to 18 different frequencies are...

    With PWM, up to 18 different frequencies are possible on Teensy 4.0.

    https://forum.pjrc.com/threads/59677-12-tones-at-once-(an-entire-octave)-is-it-possible

    With the audio library, you can...
  18. I changed the color of the 3 inputs & outputs...

    I changed the color of the 3 inputs & outputs which run at an externally controlled sample rate. I also added warning in red that they're incompatible with most of the rest of the inputs and outputs.
  19. I've added more, all the inputs & outputs have at...

    I've added more, all the inputs & outputs have at least some documentation.

    https://www.pjrc.com/teensy/gui2/

    I added WM8731 to the list of known compatible I2S chips.

    On CS4244 and CS4334,...
  20. So many good but long term software...

    So many good but long term software suggestions... much of this stuff is planned. The file abstraction is the one that’s on my list for 1.53.

    Right now, my goal is merely documentation. Not...
  21. I've added a "Install Step 1: (Macintosh...

    I've added a "Install Step 1: (Macintosh 10.10-10.15 only) Complete Software" to that page.

    In the future I'm planning to move this to a top-level "Downloads" page, where we'll offer a complete...
  22. Added a few days ago, and also a couple weeks ago...

    Added a few days ago, and also a couple weeks ago but then accidentally reverted to the old copy.



    Fixed



    Fixed
  23. I've added this to my list of bugs, but I'm...

    I've added this to my list of bugs, but I'm considering it a low priority.

    Best to remind me when 1.53-beta1 or 1.53-beta2 is posted. I do not intend to look at this until we're into the 1.53...
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    A bootloader chip is coming. Details here: ...

    A bootloader chip is coming. Details here:

    https://forum.pjrc.com/threads/57132-Bootloader-Chip-For-Teensy-4-0?p=221811&viewfull=1#post221811

    As Kurt explained, we're short staffed here due to...
  25. Glad it finally started working. The "[no...

    Glad it finally started working.

    The "[no device]" part means MacOS detected the USB device, but didn't load HID drivers and create a HID entry in the MacOS I/O Registry (or if it did, the...
  26. Updating Design Tool for Teensy 4.0 & 4.1

    I've started updating the Audio Design Tool for all the new inputs and outputs on Teensy 4.

    Here is a test copy. (planning to update the main site after some feedback)
    ...
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    Yes, it also works on Teensy 3.2. But you need...

    Yes, it also works on Teensy 3.2. But you need to install Teensyduino 1.52, because this feature did not exist in 1.51 and earlier.

    https://www.pjrc.com/teensy/td_download.html

    In Arduino,...
  28. Those names are a relic of the old 8 bit past. ...

    Those names are a relic of the old 8 bit past. We don't use those names on any of the newer 32 bit boards. The pinout cards for the very old boards have 2 sides, one for Arduino numbers and the...
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    Agreed, SPI probably can work with DMA for this...

    Agreed, SPI probably can work with DMA for this case. But the SPI hardware and DMA controller are both quite complex in this chip. The learning curve is steep to program the SPI hardware directly...
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    IntervalTimer takes a float as its input, so...

    IntervalTimer takes a float as its input, so you're not limited to integer microseconds. Internally it converts the microseconds float into the closes timing the hardware can actually provide.
  31. Use pin 7. Pin 39 is the alternate which...

    Use pin 7.

    Pin 39 is the alternate which should have been printed in gray. I will fix that on future versions of the Teensy 4.1 pinout card.
  32. We might have a subtle USB device detection bug...

    We might have a subtle USB device detection bug on Windows. On the last beta software thread, at least 2 people reported occasionally having to press the button on their Teensy because it wasn't...
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    Yes, confirmed, both Teensy 4.0 and 4.1 work well...

    Yes, confirmed, both Teensy 4.0 and 4.1 work well with this display and the purple test board.

    I tested both just now, and updated the display's page with Teensy 4 info. Here's a photo, so you...
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    They all use DMA. Theoretically you could...

    They all use DMA.

    Theoretically you could build an input or output using only interrupts without DMA. But if you generate 1 interrupt per audio sample, that's only 22 us between interrupts. You...
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    Each one works slightly differently, depending on...

    Each one works slightly differently, depending on the specific hardware it controls.

    For AudioOutputAnalog, the timing is controlled by the PDB timer. You can learn more about this timer in the...
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    Have you tried rebooting? With Serial there is...

    Have you tried rebooting?

    With Serial there is a terribly confusing bug in Windows 7 triggered by programming Teensy (or unplugging the cable) while a program has the port open. The bug manifests...
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    I don't understand the question. Everything...

    I don't understand the question. Everything you've described looks like it's working properly.
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    I've never quite understood what they meant by...

    I've never quite understood what they meant by "required for new designs" in the datasheet. But it said that back in 2014 when I designed the audio shield, so I put that regulator chip on the PCB.
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    Opps, I see what happened. It was pin 7 on the...

    Opps, I see what happened. It was pin 7 on the 1052 chip we used very early in the beta test last year. Then several pin assignments where shifted for the 1062 chip, so pins 7 and 8 would have the...
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    Oh no. Sorry this is so painful. Since the...

    Oh no. Sorry this is so painful. Since the switch to OpenJDK, there have been problems with certain Macs running Catalina. It doesn't happen on Macbook Air running 10.15.4, which makes testing and...
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    Please give this one a try. Does it run on your...

    Please give this one a try. Does it run on your Mac?

    https://www.pjrc.com/teensy/td_152/Teensyduino_MacOS_Catalina_Java8u252.zip

    This copy is the same, except the OpenJDK Java JRE is updated...
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    Maybe you're using the wrong library? Could you...

    Maybe you're using the wrong library? Could you be more specific about what example you're running? The Arduino ecosystem is filled with lots of libraries for specific hardware which do not work...
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    In Arduino, click Tools > Boards and select...

    In Arduino, click Tools > Boards and select Teensy LC.

    Then click Tools > USB Type to see the USB device configurations which are supported on Teensy LC.

    If you select other Teensy models, you...
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    Can you try it with all the LEDs disconnected, so...

    Can you try it with all the LEDs disconnected, so Teensy does all the same things but no LEDs actually receive the data. The idea is to check whether their massive changes in power consumption are...
  45. No. Teensy 3.6 has 1024K for program memory. ...

    No. Teensy 3.6 has 1024K for program memory.

    Teensy 4.0 has 512K which is partitioned between ITCM and DTCM. So if you have a huge program and all of it tries to use ITCM, you could easily get a...
  46. On Teensy 4.x, the main 512K RAM1 bank is divided...

    On Teensy 4.x, the main 512K RAM1 bank is divided into ITCM and DTCM, where I=Instructions and D=Data. ITCM is used by default for functions, unless you add "FLASHMEM" to them. The FlexRAM hardware...
  47. Not surprising, since Arduino has consistently...

    Not surprising, since Arduino has consistently rejected this proposal every time someone brings it up. And believe me, it has indeed come up over and over throughout Arduino's long history.
    ...
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    Yes, Teensy 4.1 has basically the same restore...

    Yes, Teensy 4.1 has basically the same restore program in its top 4K of the flash chip.

    Why are you trying to change the restore program? What do you hope to accomplish?
  49. That 0.1uF capacitor connects between the...

    That 0.1uF capacitor connects between the transformer center taps and GND.
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    Maybe you're confusing Teensy 4.1 with Teensy...

    Maybe you're confusing Teensy 4.1 with Teensy 4.0.

    The schematic for Teensy 4.0 shows the flash is W25Q16JVUXIM.

    The schematic for Teensy 4.1 shows the flash is W25Q64JVXGIM.
    ...
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