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  1. Replies
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    Hi Paul, Are these changes specific for T4? ...

    Hi Paul,

    Are these changes specific for T4? If I'm using the host port with a T36, am I advised to update as well?
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    My best guess is that you need to increase the...

    My best guess is that you need to increase the size of the buffer that the USB host uses to enumerate connected devices. It uses a single buffer for an entire descriptor, and it's simply not large...
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    From the testing I've done this evening, I'm...

    From the testing I've done this evening, I'm confident that it you are in the process of saving when the device looses power, parts of the memory get reset to zero.
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    For me the issue is that after programing the...

    For me the issue is that after programing the device, sometimes reading a value from EEPROM is being returned as zero, even though a previously non zero value was stored. I need to do some more...
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    I'm seeing this issue too. I can't believe that...

    I'm seeing this issue too. I can't believe that no serious action has taken place yet to resolve it yet. I have some time next week, so I'll be investigating.

    Is the issue that the Teensy LC's...
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    On Teensy 2.0, 3.2, and 3.6 I'm able to...

    On Teensy 2.0, 3.2, and 3.6 I'm able to reconfigure my devices, but it involves a bit of hacking. I'm not going to give you all the details, but the reason it's possible is because the EEPROM can...
  7. Virgin programming adapter. Sits on top of the...

    Virgin programming adapter. Sits on top of the MK20.
    23935
  8. And I have a workaround, albeit not pretty. If I...

    And I have a workaround, albeit not pretty. If I also connect pin 26 to VCC through a 3K resistor, it can be programmed again. Will have to design a jig of sorts... WTF.
  9. Hopefully someone can explain this one. It looks...

    Hopefully someone can explain this one. It looks like if pin 26 on a virgin MK20DX256VLH is connected to ground (in my case through a 10K resistor), the RESET line gets held at 3.2V and it can't be...
  10. I just put together a minimal build of the...

    I just put together a minimal build of the prototype and the MK20 is acting as expected. I'll slowly build it up and keep testing.
  11. I guess I'll make another prototype with the just...

    I guess I'll make another prototype with the just the essentials to get that watchdog firing. Thanks Paul.
  12. I'm very certain it's not a soldering issue. I...

    I'm very certain it's not a soldering issue. I have multiple boards and several virgin chips.

    I took the bootloader out of the board, and I'm still getting 3.2 volts on the RESET line. The MCU is...
  13. Issue programming a virgin MK20DX256VLH on custom T3.2

    My custom T3.2 device is unable to boot / get programmed using a virgin MK20DX256VLH. If I swap out the MK20 for a preprogramed one, then there are no issues. The device boots perfectly fine, and...
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    MIDI Feedback Loop Detection

    I got MIDI moving in and out of my device over DIN, USB, and USB host port connections. I want to implement some sort of way to detect MIDI feedback. Has anyone done anything like this? Any...
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    Thank-you very much. I normally use digikey, but...

    Thank-you very much. I normally use digikey, but I can see that mouser's parametric magic is on another level. Thanks again.
  16. Replies
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    Alternative Crystal Oscillator

    Hi all,

    For a custom Teensy LC device I'm using a NX2520SA-16MHZ-STD-CSW-5 and I'm looking for a cheaper solution. Can anyone give me some recommendations?
  17. Solved by using MIDIDevice_BigBuffer. I'm...

    Solved by using MIDIDevice_BigBuffer.

    I'm thinking MIDIDevice should be 'big buffer' by default in 2020.
  18. Teensy 4.1 usbMIDI connected to Teenst 3.6 Host Port not working.

    I'm guessing that has something to do with the fact that Teensy 4.1 is HIGH speed. This should be supported, right? The Teensy is running a simple sketch that sends a noteOn message every 200ms, but...
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    Great information, Paul. Looking forward to...

    Great information, Paul. Looking forward to those T4 bootloader chips :)
  20. Replies
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    Thanks for the detailed response, Paul. And I...

    Thanks for the detailed response, Paul. And I assume there's no difference between a Teensy 3.x and Teensy 4 in this regard?
  21. Replies
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    Is Teensy USB MIDI slow?

    I have some someone telling me that the another class compliant USB MIDI device (Roland drum module) can deliver MIDI to the operating system 2ms faster than a Teensy 3.2. Does that sound plausible?...
  22. Looks like my BCR is ready for the Bin. Won't...

    Looks like my BCR is ready for the Bin. Won't get enumerated by Windows either.
  23. One thing that's strange, is that during...

    One thing that's strange, is that during enumeration, it seems to skip over parsing the manufacturer string, even though the Device Descriptor indicates that there is one.
  24. Help getting BCR2000 working in USBHost_t3.6

    Here's the debugging info I was able to collect. Seems like the HOSTPost runs into some sort of endless loop and prevents the device to continue operating.



    port change: 10001803
    connect...
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    Seems like EEPROM.put is not working :( I will...

    Seems like EEPROM.put is not working :( I will try eeprom_write_block.

    As for the suggestions mentioned by others, thank-you. I already only save settings 5 seconds after the last change to...
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    EEPROM Write endurance optimization

    About a year ago, I was poking around and I noticed this in eeprom.c



    // The EEPROM is really RAM with a hardware-based backup system to
    // flash memory. Selecting a smaller size EEPROM...
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    I suspect if you pulled the MCU and bootloader...

    I suspect if you pulled the MCU and bootloader chip from a teensy 4.x, you could install it on a custom board and it would likely work, though.
  28. Replies
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    I managed to get this working. Basically you...

    I managed to get this working. Basically you need to send the data to the HOST device (in my case a T3.6) and then do something similar to what Luni did to program the device plugged into the host...
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    Hi. I'm trying to do something similar, except my...

    Hi. I'm trying to do something similar, except my firmware file is not located on the host device.

    I already have an application for updating my teensy based devices by sending a hex file from a...
  30. You got your MK02 from PJRC? If I have an issue...

    You got your MK02 from PJRC? If I have an issue with a board not programming, the first thing I check is if the RESET is being pulled down when I pressed the program button. That'll tell you if the...
  31. Thank you for that very clear explanation.

    Thank you for that very clear explanation.
  32. I currently use 220ohm current limiting...

    I currently use 220ohm current limiting resistors on some output pins that go to the outside world, but I would love to do away with them. A device I'm trying to power can't get enough juice through...
  33. Need help with a note in the MK20D Reference Manual

    Can someone help me understand what this is saying in more basic terms?

    Does this mean that if I have some schottky clamping diodes on an I/O to keep in within the rails +- 0.3 V, then I can get...
  34. Thanks. Definitely possible. There was talk of...

    Thanks. Definitely possible. There was talk of a USB host driver specifically coded for this purpose, but I couldn't find it. Oh well, it shouldn't be too much work to roll my own.
  35. Program Teensy connected to the teensy 3.6 Host Port

    Hi all,

    Not supported, I'm sure, but possible? Could I put the "Child" device into "Program Mode" and then just redirect HID packets to it?
  36. Thanks, Paul. I'm guessing somehow the fuse bits...

    Thanks, Paul. I'm guessing somehow the fuse bits must have gotten set. That's the only I can think of.
  37. Diagnose _reboot_Teensyduino_() not working

    I use _reboot_Teensyduino_() to update firmware in devices I sell. I've used this method for thousands of devices without issue.

    I now however have a customer whose device is no longer (it did...
  38. I changed my led from green to orange and that...

    I changed my led from green to orange and that has made a world of difference. No need for anything fancier.
  39. Thanks for chiming in, Paul. I'll put something...

    Thanks for chiming in, Paul. I'll put something together for you next week--it'll also allow me to confirm that the issue is not related to my many thousands of lines of code for this project. I...
  40. Nope... Still having issues with one device...

    Nope... Still having issues with one device plugged into a hub. So annoying...
  41. I seem to have resolved all the issues. Here's...

    I seem to have resolved all the issues. Here's my updated code for detecting hot plugging of devices. You'll notice that I'm always checking if the hub, rawHID, and USBInput are all valid.


    ...
  42. So I think I've narrowed down the problem...

    So I think I've narrowed down the problem somewhat.

    Let me give more information about the "child" devices I'm connecting. They are T3.6 composite MIDI / rawHID devices.

    If I have a single...
  43. This looks very promising. ...

    This looks very promising.

    https://electronics.stackexchange.com/a/282703/233350
  44. Thanks, Mark. Unfortunately, as stated in the...

    Thanks, Mark. Unfortunately, as stated in the first post, I have no free iO pins.
  45. Looks like a 555 timer might do the trick.

    Looks like a 555 timer might do the trick.
  46. A better LED circuit for MIDI activity indicator

    I have a MIDI out port with an LED and 220 ohm resistor connected between pins four and five to serve as a MIDI activity indicator. The trouble is that MIDI messages are so short, that the LED is...
  47. The devices I'm plugging in only have a single...

    The devices I'm plugging in only have a single rawhid interface. The 4 port hub is at least 10 years old. I'll pickup another tomorrow and test for good measure.
  48. So increasing the the HUB debounce time has made...

    So increasing the the HUB debounce time has made a huge improvement. I can now hotplug two T3.6 devices without issue. Adding a third often crashes the Host Post (or the hub?).



    void...
  49. It seems to only be an issue when using a hub. ...

    It seems to only be an issue when using a hub. If I plug a single T3.6 based device into the host port, I can hotplug it all day long without issue.
  50. As a further note, I can hotplug my Teensy 3.2...

    As a further note, I can hotplug my Teensy 3.2 based devices all day long and the Host Port never misses a beat. It's just the teensy 3.6 based units that are causing the issue.
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