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  1. Python is by far the most requested interpreted...

    Python is by far the most requested interpreted language. I know you love Forth, but I hope you can understand that viewpoint is relatively rare among the people who buy & use Teensy.
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    Yes, I can confirm PJRC registered with IEEE...

    Yes, I can confirm PJRC registered with IEEE several years ago for a 24 bit OUI.
  3. Many of the I2S DACs do this oversampling in...

    Many of the I2S DACs do this oversampling in their hardware.
  4. Yup, that looks right. Not sure why we're...

    Yup, that looks right.

    Not sure why we're turning on MCLK with PT8211 on Teensy 3.2. Maybe just leftover code from I2S?
  5. Are you sure it's really a 4.7K resistor? When...

    Are you sure it's really a 4.7K resistor?

    When we've seen problems like this before, with intermittent communication having CRC errors, the cause was a much higher resistor value mistakenly used...
  6. It can be more efficient if you can arrange for...

    It can be more efficient if you can arrange for even 1 of the buffers to be 32 bit aligned.
  7. Not possible. Many of the required signals are...

    Not possible. Many of the required signals are not accessible.

    But you can add QSPI PSRAM.

    https://www.pjrc.com/store/psram.html

    The raw performance for cache misses is obviously lower for...
  8. Well, yes. You might guess that from "Posts"...

    Well, yes. You might guess that from "Posts" count. In fact Frank has a long history of contributing not just good ideas, and a lot of pretty amazing code. So his voice & opinion does carry quite...
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    Maybe consider sharing your usb_desc.h file? ...

    Maybe consider sharing your usb_desc.h file? Might help others who find this thread.

    If using Quick Reply, click "Go Advanced" to get the full editor which lets you attach a file to your message.
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    Yes, but you will need to edit usb_desc.h to...

    Yes, but you will need to edit usb_desc.h to create a custom USB config. See the comments in that file for details.

    Remember there are 2 copies of this file, one for Teensy 3 and the other for...
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    Merging and testing MTP and LittleFS pull...

    Merging and testing MTP and LittleFS pull requests is at the top of my priority list for after the T4 bootloader chip “soft” release. Sorry I can’t do it now... really want to. But so many people...
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    Yup, that's been the plan all along. :)

    Yup, that's been the plan all along. :)
  13. Yes, very likely. Look for problems near pin...

    Yes, very likely.

    Look for problems near pin 8. If stray solder got onto the pins of that little chip near pin 8, it would cause this sort of problem.

    And just to be clear, this problem almost...
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    I do have a plan (kinda 2 plans), but so far...

    I do have a plan (kinda 2 plans), but so far haven't written anything....

    1: For the wav file player and other file-based audio library stuff, I'm planning to add a useFilesystem(FS &filesys)...
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    It's not going to do anything so complex. And...

    It's not going to do anything so complex. And even if it did, the nature of most failures is that you can't attempt the next stage anyway. If communication with the IMXRT fails, there's no way to...
  16. Google search for "DDI0403E". If Google doesn't...

    Google search for "DDI0403E". If Google doesn't find the PDF, click the link to ARM's website, then click "Download" to get the PDF.

    Once you're viewing the PDF, turn to page B3-602 for the AIRCR...
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    Microsoft did fix some bugs in usbser.sys between...

    Microsoft did fix some bugs in usbser.sys between Windows 8 to Windows 10, but apparently not this one.
  18. It's supposed to "just work" if you change to...

    It's supposed to "just work" if you change to that folder and just run "make" with all the files still located in the places the installer wrote them.

    I can understand why you probably want to...
  19. Which Linux distro is this? It's been a while...

    Which Linux distro is this? It's been a while since I've heard of one so terrible. (eg, Gentoo...)

    EDIT: oh, I see it's Arch, missed that earlier.

    Reality is PJRC only tests the x86 build on...
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    RTS should work on any digital pin (as the web...

    RTS should work on any digital pin (as the web page documents). Only CTS is scarce.
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    My gut feeling is the guesswork on msg #28 is...

    My gut feeling is the guesswork on msg #28 is probably right. Microsoft probably only supported use of the modern WIN32 APIs in their USBSER.SYS driver. FTDI's driver probably has support for older...
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    The serial page...

    The serial page lists the pins supported by Teensyduino 1.53.

    Kurt added support for the XBAR pins, and other nice features like addMemoryForRead(), but that stuff hasn't yet made any non-beta...
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    No, for USB serial it's just the USBSER.SYS...

    No, for USB serial it's just the USBSER.SYS driver built into Windows.

    On Windows 10, it loads automatically. On Windows 2000, XP, 7 & 8, Windows doesn't load USBSER.SYS automatically. So a...
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    Ok, here's the video demo. Sorry about the...

    Ok, here's the video demo. Sorry about the mediocre quality... not easy to shoot 2 screens and get exposure perfect (and I really need to get back to the bootloader chips... not time to do a more...
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    Yup, it sure looks that way. The problem...

    Yup, it sure looks that way.




    The problem is on the PC side. Nothing you can do on Teensy will help. The combination of Termite & the Windows driver simply isn't sending the control...
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    Here's a (maybe) similar report, where RTS didn't...

    Here's a (maybe) similar report, where RTS didn't work.

    https://forum.pjrc.com/threads/59612-DTR-Off-blocks-USB-serial-receive?p=230233&viewfull=1#post230233

    It turned out Coolterm works. The...
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    Just a quick update. I am hoping to begin a...

    Just a quick update. I am hoping to begin a "soft release" of the T4 bootloader chips next week, and a full release later in February.

    A "soft release" means we are going to limit the per-person...
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    Teensy Loader uses only HID protocol. It never...

    Teensy Loader uses only HID protocol. It never tries to access any serial ports.

    In the Arduino IDE, Teensy should appear twice in the Tools > Ports menu. If you select the "Teensy ports" entry,...
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    When no Teensy is connected in HID bootloader...

    When no Teensy is connected in HID bootloader mode, it already does exactly that, but with this message.

    23285

    And the teensy_reboot utility which Arduino uses to try to ask Teensy to go into...
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    Not really. But it can detect a lack of USB...

    Not really. But it can detect a lack of USB communication. I had originally planned for the red LED to blink slowly if the PC doesn't complete USB enumeration. It did in the early betas, but...
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    Does anything appear in the Verbose Info window...

    Does anything appear in the Verbose Info window when the red LED (near the USB connector) turns on? The 2 screenshots in msg #8 and #9 have none of the info indicating any USB communication...
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    Try Help > Verbose Info. You can copy & paste...

    Try Help > Verbose Info. You can copy & paste that info, or use the Log menu to save it to a file. Maybe showing that info will help us figure out what's going wrong.
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    Teensy Loader might also be configured for one of...

    Teensy Loader might also be configured for one of the smaller boards. Just press the button on Teensy to go into bootloader mode, so Teensy Loader can detect you have Teensy 4.1. Then open the HEX...
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    Any chance for a photo of it working? Always fun...

    Any chance for a photo of it working? Always fun to see lots of LEDs lit up! :D
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    Teensy 3.x only supports 12 Mbit USB device. ...

    Teensy 3.x only supports 12 Mbit USB device. Teensy 4.x supports 480 Mbit, but can also run at 12 Mbit, but that is very rare in these modern times. It's been about 20 years since PCs and USB hubs...
  36. Very difficult to say what's really going wrong...

    Very difficult to say what's really going wrong here. But with a quick look at the Teensy code, this looks like trouble:



    void loop() {
    // Buffer next command
    int count = 0;
    ...
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    Yeah, it still *feels* like 2020, which would put...

    Yeah, it still *feels* like 2020, which would put msg #32 six days into the future.
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    Only plausible if not using send_now(). ...

    Only plausible if not using send_now().




    Everything on the Teensy side software should happen in just a few microseconds. When you call send_now(), Teensy definitely isn't "holding on" to...
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    Looked very briefly at that library. Looks like...

    Looked very briefly at that library. Looks like the hardware SPI is hard-coded to only the main SPI port.

    For example, "SPI.begin()" at line 90:
    ...
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    I'm not familiar with that library. Is it this...

    I'm not familiar with that library. Is it this one? (from a quick search)

    https://github.com/MajicDesigns/MD_MAX72XX


    ps: forum messages are editable for only 2 hours, mostly as an anti-spam...
  41. Nope, no idea why. I tried to glance at your...

    Nope, no idea why. I tried to glance at your schematic, but the max image size the forum allows is too small. Maybe try attaching a PDF to your message? Click "Go Advanced" if you're in the "Quick...
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    The RTC hardware doesn't do that sort of thing...

    The RTC hardware doesn't do that sort of thing automatically. You need to use code to implement it.
  43. I tried running your test program on a very old...

    I tried running your test program on a very old Teensy 3.6 prototype with the LQFP chip. The DAC definitely works.

    23238
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    Just to take a step back and look at the "big...

    Just to take a step back and look at the "big picture" here, all of the problems you're likely to face are from the hardware running much too fast, rather than not fast enough. I know this may seem...
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    Probably a mistake or misunderstanding in the...

    Probably a mistake or misunderstanding in the wiring. We can probably help more if you show photos of how you really connected it. The best anyone can say is this hardware is definitely known to...
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    The Ethernet Pins & Socket are now live on the...

    The Ethernet Pins & Socket are now live on the website! :)

    https://www.pjrc.com/store/header_socket_3x2.html

    23223
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    I have some good news. Quite some time ago, PJRC...

    I have some good news. Quite some time ago, PJRC ordered a large batch custom length header pins for exactly this use. They finally arrived late last week. I've been reluctant to mention it until...
  48. No. This is the first I've heard from Chrome...

    No. This is the first I've heard from Chrome supporting serial without some sort of 3rd party extension.

    Does it work on Linux? My main desktop system is Ubuntu 18.04.

    How do I use it? Is...
  49. It's a shame 10/100 Magjack pinouts never...

    It's a shame 10/100 Magjack pinouts never followed any sort of standard. So many different & incompatible pinouts for exactly the same circuitry!
  50. FWIW, I just tested editing serial2.c in Arduino...

    FWIW, I just tested editing serial2.c in Arduino 1.8.13 with Teensyduino 1.54-beta5. I changed SERIAL2_TX_BUFFER_SIZE to 512. Indeed Serial2.availableForWrite() returns 511.

    I can't explain why...
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