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  1. Do you have any third-party virus, networking or...

    Do you have any third-party virus, networking or firewall software installed on your computer?
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    I meant to suggest this earlier: pads on the...

    I meant to suggest this earlier: pads on the bottom to provide access to the USB connector data pins. This allows for a design that has its own USB port for power/programming (USB-C anyone?)
  3. Can't reproduce here with Teensy loader 1.47 on...

    Can't reproduce here with Teensy loader 1.47 on High Sierra 10.13.6 with firewall on or off.

    Paul: is there any way to get the error result that prints that message?
  4. I can try to reproduce this here, but first I...

    I can try to reproduce this here, but first I assume you checked to see that this isn't an issue with the firewall configuration?
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    Excellent, @Simmic, thanks! I've tried importing...

    Excellent, @Simmic, thanks! I've tried importing this model into the KiCad footprints for Teensy 4. Here's what a 3d render looks like for the breakout board I've been working on:

    18097

    I...
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    Sounds great, @Dog-One! Can you give a little...

    Sounds great, @Dog-One! Can you give a little background on what changes you had to make to get it to build? I'd like to get it working under Arduino and PlatformIO.
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    Still an issue. Filed bug here...

    Still an issue. Filed bug here https://github.com/PaulStoffregen/cores/issues/401 so this doesn't get lost.
  8. Just saw this post about the next version of...

    Just saw this post about the next version of PlatformIO which has some VERY slick tools for investigating firmware symbols, memory allocations, static code analysis, etc.
    ...
  9. Thanks, Paul, that's super useful and clear. ...

    Thanks, Paul, that's super useful and clear.

    A couple of thoughts:

    Would it be possible to add the default values for the various fixed addresses?

    One note on the graphic: I puzzled over...
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    Another good suggestion. I'll add that to my...

    Another good suggestion. I'll add that to my next version!
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    Good point, I've added it to the OSHPark project...

    Good point, I've added it to the OSHPark project page for the latest design.
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    No good reason, they were like that in the...

    No good reason, they were like that in the original default footprint for the header that I used. Rounded them out:

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    Good suggestion. I'll see what I can fit in...

    Good suggestion. I'll see what I can fit in there! How's this?

    17970
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    And some more updates this morning to add...

    And some more updates this morning to add additional ground connections and a ground plane, as well as some more silkscreen improvements:

    https://github.com/blackketter/teensy4_header_breakout
    ...
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    I've updated the design a bit to improve the...

    I've updated the design a bit to improve the silkscreen and tweaked the edge cuts to not cut through two pins that didn't need cutting (teensy pins 12 & 13). Updated here:
    ...
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    +1 for this! I really like these hybrid...

    +1 for this! I really like these hybrid castellated / through-hole pads on the edge. I do understand that there will be parts on the bottoms of teensy 4.x board requiring a cutout in the base board.
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    They were pretty clear with me that the...

    They were pretty clear with me that the castellated designs were not guaranteed. Their tips are here: https://docs.oshpark.com/tips+tricks/castellation/

    My guess is that the thinness of the board...
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    Another datapoint: I got my 0.8mm boards back...

    Another datapoint: I got my 0.8mm boards back today, finally, and only one of the three of them is usable. The cuts were all made on all the boards but two of the three boards each had the plating...
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    @Paul: Any clue where I could dig to see if I...

    @Paul: Any clue where I could dig to see if I could find where the lockup is happening? Happy to dig in here a bit...
  20. Ah, I see from the schematic that the POR_B pin...

    Ah, I see from the schematic that the POR_B pin is used by the boot loader chip. Would it be feasible to add a pin that forced a reset by disabling the 3.3v regulator?
  21. I'm only really missing one specific pin from the...

    I'm only really missing one specific pin from the Teensy 4.0: RESET

    Apart from that, I'd really love to be able to attach inexpensive LCD displays and take advantage of the 2D graphics...
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    Also, I should have noted earlier that after the...

    Also, I should have noted earlier that after the USB serial lockup my larger application continued to work.

    In fact, USB serial writes from Teensy to host continue to work and loop() continues to...
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    Alright! Thanks! With that test the ISR...

    Alright! Thanks! With that test the ISR blinking continues to work even after the USB serial is locked up. And no HardFault blinking.
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    I'm not following. Something to test?

    I'm not following. Something to test?
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    Thanks defroster, but alas, no. A single blink...

    Thanks defroster, but alas, no. A single blink when it start, then it locks up as above without any blinks.
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    Once it locks up I can't unlock it with further...

    Once it locks up I can't unlock it with further transfers. With your example code, shorter sends to the Teensy work fine (led goes on, then goes off a couple of seconds later), but once a large...
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    macOS Mojave 10.14.6

    macOS Mojave 10.14.6
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    Thanks, defragster. I did try your changes to no...

    Thanks, defragster. I did try your changes to no avail.

    I suspect that the issue outlined at https://forum.pjrc.com/threads/57325-Teensy-4-0-Serial-available()-stops-incrementing is the same...
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    Teensy 4.0 USB serial lockup

    I think I'm seeing a bug in usb_serial on Teensy 4.0. When I try sending a block of text larger than 2413 bytes via the serial port, it locks up. Here's the sketch:

    #include <Arduino.h>

    void...
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    The breakout board discussed here...

    The breakout board discussed here https://forum.pjrc.com/threads/57672-Another-Teensy-4-0-Breakout-Board uses castellated pads like in that photo.

    If you are using KiCad, the footprint used by...
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    One more thought: I don't see why the teensy...

    One more thought: I don't see why the teensy itself shouldn't continue to work and can't think of a reason that the castellated pads that you soldered wouldn't work, though on the wrong side of the...
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    I just updated the design with the new silkscreen...

    I just updated the design with the new silkscreen warning, and iit also brings out ground to the pins for USB. I haven't ordered one yet but I think it should be ok.
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    DOH! So sorry, I nearly did that myself. I'll...

    DOH! So sorry, I nearly did that myself. I'll update the design with a silkscreen note that says "This side faces Teensy!"
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    Glad to hear you got a (mostly) working board. I...

    Glad to hear you got a (mostly) working board. I just checked my pin 34 (ie. the top left pin on the breakout board and it seems to work fine by toggling it on and off in software. I don't see an...
  35. This is great, nice work! Did you consider...

    This is great, nice work! Did you consider access to the USB pins? I wonder if there's a way to add a USB port here...
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    I packaged a teensy compatible library that...

    I packaged a teensy compatible library that provides version of Lua with basic REPL. It's really just a proof of concept now, but might be useful to you. Happy to put a little more work into it if...
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    Looking at the usb_serial.h header file, I see...

    Looking at the usb_serial.h header file, I see the following methods for usb_serial_class which is what Serial is:



    uint8_t dtr(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_DTR) ? 1...
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    The edge cuts are generally milled out...

    The edge cuts are generally milled out mechanically. I think that a laser to cut the boards would need to be pretty powerful.

    I know that the flex boards that OSHPark does are cut with a laser,...
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    I've gotten the SD card sidecar and the USB Host...

    I've gotten the SD card sidecar and the USB Host sidecar in .8mm and the ESP32 sidecar in 1.6mm. Assembled and all working fine. I haven't tested the 3.3v regulator on the ESP32 board yet, running...
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    Adafruit has gotten the Audio library to work...

    Adafruit has gotten the Audio library to work with some of their boards, I don't' think that includes any ESP32 support, but it may be possible.

    https://github.com/adafruit/Audio
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    ESP32 has dual cores that pretty easy to use,...

    ESP32 has dual cores that pretty easy to use, with the help of FreeRTOS. Here's a simple tutorial: https://randomnerdtutorials.com/esp32-dual-core-arduino-ide/
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    I wrote to OSHPark and included the picture from...

    I wrote to OSHPark and included the picture from above and got this response right away:



    They did tell me when I asked about castellations earlier that they couldn't guarantee it. I went...
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    Sorry about that, guys! I suspect that it's...

    Sorry about that, guys!

    I suspect that it's related to the thinner material. I haven't yet ordered the thinner ones, I'll do it now, along with another set of thicker ones.

    @DerekR: The...
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    The USB Host daughter card I'm working includes...

    The USB Host daughter card I'm working includes the capacitors and the protection chip provides reverse current flow and ESD protection, but not any voltage regulation. This circuit was lifted from...
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    Yeah, they are. With ample flux and a little...

    Yeah, they are. With ample flux and a little cleanup from excess solder with a braid mine went pretty easy.
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    Suggestion: Upgrade connector to USB-C. I...

    Suggestion: Upgrade connector to USB-C.

    I have a Teensy with a failing micro USB connector and have been impressed by the mechanical improvements of USB-C, not the least of which is that it works...
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    My USB host and SD boards come 10/4. ESP32...

    My USB host and SD boards come 10/4. ESP32 boards next week. I think I've got all the other parts, thanks for your post, I should double check.
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    I think a Teensy 4.1 with the same form factor as...

    I think a Teensy 4.1 with the same form factor as a Teensy 3.6 would be really great. And to the extent that you can replicate the pins so that existing designs can upgrade to Teensy 4.x from Teensy...
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    The ESP32 breakout board, when attached to the...

    The ESP32 breakout board, when attached to the bottom mounted Teensy4 header breakout board provides a serial connection via Serial6 and uses digital pins 26 and 28 to control the ESP32 pins IO0 and...
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    That sounds like a reasonable approach, though if...

    That sounds like a reasonable approach, though if they are connected by a serial port it might be slow, depending on how many primitives it takes to draw your screen...
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