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  1. Note if you use a normal sketch and not uncanny...

    Note if you use a normal sketch and not uncanny eyes (i.e. one that a proper SPI.beginTransaction and SPI.endTransaction, have devices that can share the SPI bus, not try to optimize to use an async....
  2. Well there is always uncanny eyes. This...

    Well there is always uncanny eyes.

    This originally was an Adafruit sketch for the Teensy 3.2 using the 128x128 TFT/OLED displays. The author (Phil Burgess / Paint Your Dragon) used advanced...
  3. I suspect the reason is on the Teensy...

    I suspect the reason is on the Teensy 3.2/3.5/3.6, the two grounds are different. The ground next to pin 0 is the digital ground. The ground between VIN and 3.3v is the analog ground. The Teensy...
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    Ok, thanks.

    Ok, thanks.
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    I2S for input and output

    I don't know the I2S protocol all that well.

    If I wanted to have an I2S input (such as the I2S microphone sold by Adafruit) and an I2S output (such as audio shield or the various I2S devices that...
  6. Note, you have to understand the Teensy 4.0 is...

    Note, you have to understand the Teensy 4.0 is different in terms of pin layout than the Teensy 3.2. That's why there is the revision D of the audio shield that only works with the Teensy 4.0 (and...
  7. I don't yet have any comments on the new stuff,...

    I don't yet have any comments on the new stuff, but I will note that traditional pin 12 is mislabeled as pin 10.

    I assume that at least pins 24-33 will be the same as the underneath pins on the T4...
  8. There are various things that come to mind. ...

    There are various things that come to mind.

    Most obvious is you may have slight solder bridges or cracks that only show up occasionally. When you switch wires, you move the board slightly, and...
  9. Or use the other 2 SPI buses. To use SPI1, you...

    Or use the other 2 SPI buses.

    To use SPI1, you need to connect pads for pins #26-27 from underneath the Teensy 4.0 (and use pins 0/1, which means you can't use Serial1). Note, the pinout card...
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    If you are going to control the CS42448 via I2C,...

    If you are going to control the CS42448 via I2C, you might need somewhere on the I2C bus pull-up resistors between each of the two pins (18, 19) and 3.3v. Typically for Teensy, you would use 2.2K...
  11. One thought that I've had is instead of a SD...

    One thought that I've had is instead of a SD card, make the extra space beyond the current Teensy 4 have through hole pins, grouped logically, grouping the pins either into 10 rows of 7 columns each,...
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    As I said earlier, I tend to like what I called a...

    As I said earlier, I tend to like what I called a hacker's shield that has islands with pins needed for a particular purpose (I2S1, I2S2, Serial1, Serial2, i2C0, i2C1, SPI0, SPI1, etc.). And it...
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    [QUOTE=Andy Belov;218961]Wow, that's advanced. I...

    I would have hoped even the Teensy 3.x and similar ARM M4 Adafruit/Arduino/Sparkfun boards would have already exposed a lot of these slow devices that were only made for AVR 328p (i.e. Arduino Uno)...
  14. Well if size is the primary issue, bear in mind...

    Well if size is the primary issue, bear in mind the Teensy 4.0 is the same size as the 3.2, though you would need to solder two wires to get the D-/D+ pads underneath the Teensy. If you have already...
  15. In preparation for getting my board today, I...

    In preparation for getting my board today, I looked at the pin assignments of the board. I noticed that where the 2 DAT pins (A22/A21) are in the 3.5/3.6 are not used. If you ever decide to respin...
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    This is one of the areas where there is no one...

    This is one of the areas where there is no one answer.


    Some people need as much read/write RAM as possible to run their sketches, but they don't need to use the RAM to write to high speed...
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    It is one of those chicken and egg scenarios. If...

    It is one of those chicken and egg scenarios. If you don't have the hardware, you likely won't get the software. If you have the hardware, depending on people's motivations, you may or may not get...
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    Please don't post duplicate threads. I answered...

    Please don't post duplicate threads. I answered your question over in the first post I saw (in the audio sub-forum).
  19. You should be able to as long as you don't use a...

    You should be able to as long as you don't use a device with either 0x0A (SGTL5000) or 0x1A (WM8731) addresses, since those are on the audio board. The audio board has pull-up resistors on it, so...
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    Yes, I was wondering the same thing of how you...

    Yes, I was wondering the same thing of how you connect the Teensy w/o soldering. I could understand different sized pogo pins for the outside pins compared to pins 24-33, but the pins for the SD...
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    Nice looking board. Hopefully rev C will be out...

    Nice looking board. Hopefully rev C will be out shortly, as having pin #23 (LRCLK1) would be nice to have.
  22. Timings for different uncanny eyes

    This morning I decided to do timing runs for all of the uncanny eye variants I have setup. Note, these don't necessarily have the same options compiled it, and they are using somewhat different base...
  23. Would it be possible to list the actual products...

    Would it be possible to list the actual products for the ferrite beads, capacitors, and resistors? I'm not up on the numbering scheme used for surface mount components, and there are just so many...
  24. Teensy 4.0 audio shield roll out

    I was browsing all 3 electronics candy stores (Adafruit, Sparkfun, and Digikey). I noticed that the Teensy 4.0 version of the Audio Shield hasn't made it to Adafruit or Sparkfun yet (Digikey gets...
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    Interesting shields, though I probably would...

    Interesting shields, though I probably would prefer one shield with all 3 options.

    I go back and forth as to how to provide battery charging to the Teensy. In the past I've used onehorse's. My...
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    It might be simpler to use the Rasberry Pi 2x20...

    It might be simpler to use the Rasberry Pi 2x20 IDC cable. That is all through hole (0.1" or 2.54mm) spacing, and there are cheap cables, shrouded headers, etc. Though of course there might be an...
  27. I was doing some runs of uncanny eyes this...

    I was doing some runs of uncanny eyes this morning on a Teensy 4.0 using the 240x240 Adafruit displays, one on SPI0 using the default 10 CS pin, and the second display on SPI1 using the default 0 pin...
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    Hacker's shield

    One thing that I often try to do in my customized prototype boards is to lay things out logically.

    Right now, with the Teensy 4.0 I could imagine having clusters of pins that you can use...
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    Possible new shields

    Paul suggested posting shield suggestions here so it doesn't get lost in the future features & pinout thread:

    https://forum.pjrc.com/threads/57842-Future-Teensy-features-amp-pinout


    So I...
  30. Note, the OSH park link is (eliminate the '**'):...

    Note, the OSH park link is (eliminate the '**'):

    https://oshpark.com/shared_projects/CrfX6z5v
  31. Audio shield flash memory (SOIC-8)

    I was thinking of tricking out my Teensy 4.0, and adding flash memory to the audio shield. I also would be adding standalone flash if I'm not using the shield.

    In the past, I would use the prop...
  32. This thread asked for better documentation of...

    This thread asked for better documentation of PWM:

    https://forum.pjrc.com/threads/57927-Doc-update-request-to-cover-Teensy4-0-for-Pulsed-Output-PWM-amp-Tone?p=218268#post218268
  33. If the issue is 16-bits, using float will help a...

    If the issue is 16-bits, using float will help a little, but you've just moved the goal post out just a little. Float has 23 bits of precision for the mantissa, plus the hidden bit. So you can...
  34. That error is due to the Teensy 4.0's memory is...

    That error is due to the Teensy 4.0's memory is sub-divided into regions, and you can only put less that 512K into the code/const region. Unfortunately this is a limitation of the NXP 1062 that is...
  35. For me. the wrong pins were brought out in the...

    For me. the wrong pins were brought out in the shield I got (pins 30, 31), so I never used the pogo pins for the underneath 10 pads. I did use them for the on/off button and they seemed to work, but...
  36. The reason for the end cuts is to bring out the...

    The reason for the end cuts is to bring out the three buttons from the end row to the side pins:

    on/off
    program
    Vbat


    Now, if you are doing your own PCB, you could just as easily have...
  37. Obviously it depends on how much you used...

    Obviously it depends on how much you used floating point, and whether your floating point was adds/subtracts, or whether it had a lot of divisions, calls to trig functions, etc.

    For the record:
    ...
  38. I am poor in soldering, and just wrecked a purple...

    I am poor in soldering, and just wrecked a purple Teensy 4.0 trying to cut the VUSB->VIN trace (fortunately, I had ordered another purple Teensy and I have a green one also) before attaching the...
  39. Is there a third Teensy 4.0 breakout board?

    I've been following the process of the loglow breakout board:

    https://forum.pjrc.com/threads/57122-Teensy-4-0-Breakout-Kit


    And the second PCB designed by blackketter:

    ...
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    My boards came with the second version of the...

    My boards came with the second version of the layout (0.14" depth), and I'm puzzling out how to set up my Teensy.

    Normally I use large female stacking headers cut down to size:

    ...
  41. Yes it works. I thought the I2S objects were...

    Yes it works. I thought the I2S objects were always stereo, and they are just mono streams (with some inputs producing two mono streams, and some outputs taking two mono streams).
  42. Good to know. Thanks.

    Good to know. Thanks.
  43. Thanks. I guess I didn't notice the two separate...

    Thanks. I guess I didn't notice the two separate inputs on i2s1. I'll try it out tonight when I get back into hacking Teensys.
  44. Cheap stereo speakers for prop use?

    I tend to want to use teensy in costume props, and sometimes I want to add sound support. This means small, lightweight, and can run on a single USB battery that also powers the Teensy and people...
  45. Is there a way to isolate/swap/boost just the left or right channel?

    I was wanting to test a setup with stereo speakers. I wanted to use the mono ToneSweep, but instead direct to each speaker (i.e. do a run with ToneSweep on the left channel and then do a run on the...
  46. Library documentation (particularly for Teensy 4.0)

    As I answer questions about the library, I notice some of the library pages have not been updated for Teensy 4.0. A meta question is whether it is time to make a separate Teensy 1.0/2.0/2.0++...
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    On Teensy 3.2, 3.5, and 3.6 there is support for...

    On Teensy 3.2, 3.5, and 3.6 there is support for setting pins for transmit enable, RTS, and CTS. Once you set these pins, the Serial code does the flow control for you. While you can use any pin...
  48. Note, I haven't done it yet, but I suspect that...

    Note, I haven't done it yet, but I suspect that there isn't room to solder a micro SD card directly to the Teensy. There are 2 or 3 bumps in the back of the Teensy that looks like they would be...
  49. You might be seeing 'Contact Bounce' or chatter:...

    You might be seeing 'Contact Bounce' or chatter:

    https://en.wikipedia.org/wiki/Switch#Contact_bounce
    https://www.youtube.com/watch?v=jYOYgU2vlSE


    There are various hardware solutions, but...
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    Talking about SPI, I noticed the SPI page needs...

    Talking about SPI, I noticed the SPI page needs to be updated for Teensy 4.0:

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


    I don't know if spi4teensy3 is still usefu fpr Teensy 3.x (this is...
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