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    I've traced to problem down to checking value...

    I've traced to problem down to checking value usb_configuration. Any idea why this would take so long?
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    Disregard. Upon further testing, I was able to...

    Disregard. Upon further testing, I was able to get my MIDI circuit running flawlessly at 1 message every ms, so my issue is somewhere in my own code.
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    Diagnose MIDI DIN In Throughput Issue

    I'm seeing dropped MIDI messages on my custom Teensy 3.2 (using MIDI library 3.2). I've done some tests with a loopback cable, sending messages out the MIDI Din Out and straight back into the MIDI...
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    Thanks for the info. I know it's all pretty hard...

    Thanks for the info. I know it's all pretty hard to say for sure. In an attempt to resolve the issue, on my new LC based devices, I've implemented a power loss detection circuit and replaced the...
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    Teensy LC Diagnose EEPROM Issue

    I'm seeing some rare instances of the EEPROM being reset and data stored being corrupted and possibly lost altogether.

    I'm wondering...If the teensy is in the middle of writing to EEPROM as the...
  6. Actually I did reference the datasheet. They...

    Actually I did reference the datasheet. They don't come right out and say, 'BTW, there are not pull-ups on those ports'.

    I kinda knew the answer as my prototype was not.playing nicely. It's not...
  7. Do the Teensy 3.6 pins A10, A11, A21, A22 have internal pullups?

    Title says it all.
  8. So I managed to resolve my ESD issues. I can't...

    So I managed to resolve my ESD issues. I can't be entirely sure what made the difference, but here are some of the things I did. It would be great if others could comment on whether the changes I...
  9. I've order three different flavors of the same...

    I've order three different flavors of the same design and I'll build them next week. I basically added a bunch of power jumpers (0 ohm resistor) so that I can make my traces more direct. I'll post...
  10. That is hilarious! Thank-you for that.

    That is hilarious! Thank-you for that.
  11. Need advice for ESD proofing my Teensy 3.2 designs

    Hi all,

    I'm trying to get my designs to be ESD proof so that I can pass EMC immunity testing. The board is a 2-layer design with a ground plane on the bottom and it's installed in a plastic...
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    2-Layout Custom Teensy Oscillator Layout

    Can I get some feedback about my oscillator layout on a 2-Layer custom Teensy LC? Should I be making a ground island within my bottom layer ground plane for the oscillator like I have shown in the...
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    A good opamp is the mcp6004. Programming in your...

    A good opamp is the mcp6004. Programming in your own oscilloscope will be infinitely more useful than buying a hardware unit. The eDRUMin UI shows the waveform allowing me to really see what the...
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    You have an oscilloscope? That helps a lot. I...

    You have an oscilloscope? That helps a lot. I actually programmed oscilloscopes into each input so that I could visualize what was happening.
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    You have the device, so I can't stop you from...

    You have the device, so I can't stop you from opening it up and taking a look. There are many combinations of components that will give you good results, but the real magic is in the firmware. You...
  16. Cheers. Thanks

    Cheers. Thanks
  17. What are the diodes on the Teensy 3.6 VBUS for?

    18880

    I working on a custom Teensy 3.6 that includes a power management chip and I'm wondering if I need to keep those parallel diodes.
  18. What's your budget?

    What's your budget?
  19. I could do it for you. It's pretty...

    I could do it for you. It's pretty straightforward coding. Why wouldn't you just do it yourself?
  20. Thanks for looking into this Paul. I'm guessing...

    Thanks for looking into this Paul. I'm guessing the issue much be related to that particular customer's system.
  21. Opps. I missed 'not'. I meant to say the "The...

    Opps. I missed 'not'. I meant to say the "The only thing I'm not entirely...
  22. Here's the schematic. The only thing I'm...

    Here's the schematic. The only thing I'm entirely sure about is the resistor on Vo.
    17939
  23. I think it's fine that you're specifying the...

    I think it's fine that you're specifying the 6N138. My motive for asking here is that I have customer experiencing some issues with dropped MIDI messages through my MIDI in DIN and I'm looking for...
  24. MIDI DIN in: Why is the PC900 optocoupler not recommend for Teensy 3.x anymore?

    If you take a look at the MIDI DIN in schematics for Teensy devices, you'll see that a different optocoupler is recommended for Teensy 2 and Teensy 3.x.

    About three years, that same page...
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    A fabrication disaster in China

    I'm in the process of getting some devices fabricated in China. After the boards were fabbed, but before assembly had started, I noticed a potential issue with my design. I contacted them and paid...
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    I have a solution. I hacked pins_teensy.c ...

    I have a solution.

    I hacked pins_teensy.c

    This is what it looked like before:


    void _restart_Teensyduino_(void)
    {
    cli();
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    Restart Teensy 2.0

    I've got some code that reboots a Teensy 3.2 just fine.


    #define CPU_RESTART_ADDR (uint32_t *)0xE000ED0C
    #define CPU_RESTART_VAL 0x5FA0004
    #define CPU_RESTART (*CPU_RESTART_ADDR =...
  28. Raw_HID is producing that noise, and I suspect...

    Raw_HID is producing that noise, and I suspect the Serial port would as well. In my tests, I would only send a message over the serial if noise was detected. And the fact that no Serial messages...
  29. If I don't send the RAW_HID data, there is no...

    If I don't send the RAW_HID data, there is no noise (at least no bad spikes that make me want to rip my hair out). I indeed test this by sending out data over a hardware serial port as well.


    ...
  30. Dealing with noise generated by sending data over USB

    I'm struggling to get rid of some noise that is creeping into analogRead() measurements in a sensitive analog circuit based on a custom Teensy 3.2 board.

    After thorough investigation, I find that...
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    You will have to roll your own solution. Another...

    You will have to roll your own solution. Another thing I can think of would be to set a timer that periodically sends date to the host. If the function returns 0 bytes sent, you could likely infer...
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    I'm not sure it this would work, but couldn't you...

    I'm not sure it this would work, but couldn't you read the voltage on the USB 5v when an analogRead?
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    if (usb_configuration) { }

    if (usb_configuration) {

    }
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    It's definitely causing small problems with the...

    It's definitely causing small problems with the ADC; I wouldn't have hooked up the scope in the first place if there wasn't an issue. The noise level isn't so much terrible as it is a nuisance that...
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    No dice. Thanks for your suggestions, though. I...

    No dice. Thanks for your suggestions, though. I don't think there's anything I can do. Even if I connect the teensy input pin directly to Vcc/2, GND or VCC, I still get that noise.
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    Teensy 3.2 Noise generated by analogread

    Hi, all. I have a problem with noise in my opamp circuit for reading an AC signal. Based on my tests, the noise appears to be generated by the call to analogRead. Below is the output of my scope. ...
  37. Thanks, Paul. Thanks for taking the time to...

    Thanks, Paul. Thanks for taking the time to answer this question so thoroughly. The sector writing seems to be exactly what I would need, but I'm worried that it's a bit above my skill level. I'll...
  38. Teensy 3.2 Lock Bits and firmware updates

    Is it really not possible to have a secure device while also allowing its firmware to be updated without pressing the program button? If we enable the lock bits, then _reboot_Teensyduino_() doesn't...
  39. Issue with keyboard interfaces in 3rd party USB Host ports

    I make devices with multiple class compliant interfaces USB MIDI / RAWHID / KEYBOARD. These devices are often plugged into the USB Host ports of 3rd party hardware.

    I've noticed that some USB...
  40. Thread: Midi 2.0

    by yeahtuna
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    No, it's not secret. I created a new account and...

    No, it's not secret. I created a new account and I was able to download the spec from that link in the first post.
  41. Thread: Midi 2.0

    by yeahtuna
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    That link has a conceptual map of how it works. ...

    That link has a conceptual map of how it works. The specification is available for download to registered users on MIDI.org, but I had issues creating an account. I'll have to fire off an email.
    ...
  42. Thread: Midi 2.0

    by yeahtuna
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    Midi 2.0

    It's coming.

    https://www.midi.org/articles-old/midi-manufacturers-association-mma-adopts-midi-capability-inquiry-midi-ci-specification
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    I totally agree that 24bit/48k is the minimum for...

    I totally agree that 24bit/48k is the minimum for any prosumer audio gear--not because anyone can tell the difference, but just because it's the industry standard. You would be a marketing failure...
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    6 MKL04 Bootloader Chips for sale

    The title says it all. $20 including shipping to pretty much anywhere in the world. I've switched to the smaller chips, but it would be nice to find a home for these guys. Let me know if you're...
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    Sounds good, Paul. I would obviously be...

    Sounds good, Paul. I would obviously be extremely pleased to see this functionality added, even if it's only for my future designs. It's there any public information about Teensy 4.x? Would like...
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    Yes, encrypted firmware updates.

    Yes, encrypted firmware updates.
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    Uploading encrypted firmware support

    Hi Paul,

    Years back you mentioned that you might include this if there was enough interest and funding available. How much money are we talking about?
  48. Custome Teensy 3.2 Ground planes with GND and AGND

    Hi all,

    I've been making custom Teensy devices for a while and just recently I've noticed the importance of segregating analog and digital circuits with respect to their ground paths. I have a...
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    I resolved the issue. It had nothing to do with...

    I resolved the issue. It had nothing to do with the trigger circuits. The culprit was my MIDI Out DIN. I had the port grounded to AGND. I connected it to the digital GND and the voltage spikes...
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    Here's a diagram of an 8 - input circuit, showing...

    Here's a diagram of an 8 - input circuit, showing the location of capcitors.15211
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