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    If the Teensy 4.0 is mostly dead, try holding...

    If the Teensy 4.0 is mostly dead, try holding down the programming pin for 15 seconds. This will cause the boot loader chip to reset the main chip and load a blink program. And obviously make sure...
  2. Whenever Sparcfun or Adafruit are out of...

    Whenever Sparcfun or Adafruit are out of something, it helps to look at the secondary suppliers:

    Digikey:...
  3. The Teensyview has solder jumpers so that you can...

    The Teensyview has solder jumpers so that you can change some pin assignments. You can eliminate the reset function which is on pin 15 (A1) by changing the solder jumper to pin #2. You can modify...
  4. There are step-up voltage regulators that boost...

    There are step-up voltage regulators that boost the voltage from a lower voltage to a higher voltage. There are step-up/step-down regulators that can either boost or lower the input voltage to a...
  5. From watching the posts, there are various...

    From watching the posts, there are various threads about adding the support for USB file system support (look for threads about MTP support, beta7 posts, etc.). Having the rewritten file system...
  6. Paul's paper on better SPI design...

    Paul's paper on better SPI design (https://www.pjrc.com/better-spi-bus-design-in-3-steps/) would indicate that SPI devices having their own CS lines does not prevent the need for tri-stating. The...
  7. As others have said, littlefs is now incorporated...

    As others have said, littlefs is now incorporated in the latest beta. In the beta, the file abstraction layer has been rewritten to provide things like access to flash memory systems.

    If you are...
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    I've not used it, but there is this: ...

    I've not used it, but there is this:

    https://forum.pjrc.com/threads/61373-Using-GDB-with-Teensy-without-hardware-debugger-first-Beta
  9. Or given you have a Teensy 4.1, just solder a...

    Or given you have a Teensy 4.1, just solder a W25Q128JVSIQ or similar flash memory chip to the underside of the Teensy 4.1. This can provide 128 megabits (8 megabytes) of non-volatile memory. ...
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    I tend to use prototype boards quite a bit. Here...

    I tend to use prototype boards quite a bit. Here are some that I like that I use for Teensy 4.1 (and 3.5/3.6). Note, they do not give access to the solder pads underneath the Teensy 4.1. ...
  11. First of all, please use the '#' toolbar button...

    First of all, please use the '#' toolbar button to enclose the code. It allows us to read the code more naturally. The '#' toolbar button will add [ CODE ] and [ /CODE ] tags, and you put the code...
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    The Raspberry PI hat system has this. They hook...

    The Raspberry PI hat system has this. They hook up a small EEPROM memory to the secondary I2C bus, and via I2C, you can read the information. Unfortunately IMHO, they made a fundamental design flaw...
  13. And there are low powered speakers that are meant...

    And there are low powered speakers that are meant to be plugged into a headphone jack. The speakers typically have a battery and USB power support. I've seen them called 'bomb' speakers or...
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    There is a company that offers a 'fully loaded'...

    There is a company that offers a 'fully loaded' Teensy 4.1 with the 8MB PSRAM chip and a 16MB flash memory soldered on to the board and pins soldered in if you would prefer not to do the SMT...
  15. And if you are going to update the card any way,...

    And if you are going to update the card any way, it may be a good time to document the I2S pins.
  16. IIRC, the original revision A-C audio boards for...

    IIRC, the original revision A-C audio boards for the Teensy 3.x processors, used the analog ground (the ground between the 3.3v pin and the VIN pin) for the audio stuff, and used the ground on the...
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    You should start with this tutorial that Paul did...

    You should start with this tutorial that Paul did some years ago to better understand the pieces. Note with Teensy 4.0/4.1 some of the pins used are different than the 3.2/3.5/3.6 examples.

    ...
  18. Not really. The DFPlayers are setup where the...

    Not really. The DFPlayers are setup where the microprocessor really doesn't have access to the data. The idea is you hook up the device via USB to your computer, and put songs/sounds on it. And...
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    Yes, it has been a long struggle. This is the...

    Yes, it has been a long struggle. This is the first power processor I've been involved with from the concept, helping to form the hardware ISA. The power7 was already designed when I started...
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    Unfortunately, this is probably one of the areas...

    Unfortunately, this is probably one of the areas that I have to be careful of commenting on in public forums, though in all honesty, I probably don't know that much.

    My real life job is working on...
  21. It depends on what pins you have available. If...

    It depends on what pins you have available.

    If you have the TX/RX pins of one of the 8 serial ports available, you could use one of the various chips that play a sound based on a serial stream. ...
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    It gets even more interesting if you have to...

    It gets even more interesting if you have to bring up the OS and the compiler at the same time. I.e. the chip you are bringing up is not a descendant of an existing chip, and you have to worry is...
  23. IIRC on the Teensy 4.0 you only have 2 CTS pins,...

    IIRC on the Teensy 4.0 you only have 2 CTS pins, both of which are inconvenient locations. Teensy 4.1 has a 3rd CTS pin, also in an inconvenient location:

    Pin 19 on Teensy 4.0/4.1 is CTS3. ...
  24. A couple of minor comments: 1) Pin 6 is used...

    A couple of minor comments:

    1) Pin 6 is used by the audio shield if you solder a flash memory chip to the audio shield (which can be a faster but smaller permanent storage device than the SD...
  25. These directions only work on the Teensy 3.x/LC...

    These directions only work on the Teensy 3.x/LC processors. The Teensy 4.0/4.1 processors do not have alternate pins for the main SPI bus. You have to use pin 11 for MOSI, pin 12 for MISO, and pin...
  26. IIRC, the 74HCT245 is available in through hole...

    IIRC, the 74HCT245 is available in through hole form, while some of the other level shifters are only available in surface mount soldering. The through hole form can be used in breadboards without...
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    I don't know about the Pi version. For the...

    I don't know about the Pi version. For the Aurdino-class boards, no python is involved.

    For the last version (for the 240x240 displays, and it needs the M4 class machines) it does use the flash...
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    Note the author of the eyes program has rewritten...

    Note the author of the eyes program has rewritten it several times.

    The first version was for the Teensy 3.2 and used 128x128 displays;
    The second version (that you mention) was written for...
  29. The Teensydunio 4.1 has a built-in sd card...

    The Teensydunio 4.1 has a built-in sd card reader, and some of the demos use that to hold images. Going down the road, the Teensy 4.1 has two pads underneath the Teensy that you can solder surface...
  30. The Teensy 4.x shield only started shipping in...

    The Teensy 4.x shield only started shipping in December of 2020, so the user base is likely ramping up. I ordered one of the Teensy 4.x shields and it now works for me running some of the demos. I...
  31. Well that is a Paul question, but from afar I see...

    Well that is a Paul question, but from afar I see we are making progress, but I'm not sure how long it will take before the things gel. There are several threads with the various parts being...
  32. Yes I may have been mistaken (or ordered the...

    Yes I may have been mistaken (or ordered the wrong parts at digikey).
  33. I've used this logic level shifter in the past. ...

    I've used this logic level shifter in the past. I've used it for I2C shifting and WS2812B/neopixel shifting. Unfortunately, there is no data sheet:

    https://www.pololu.com/product/2595

    I...
  34. The problem is you are using code to read files...

    The problem is you are using code to read files from the SD card reader. The Teensy 3.2 does not have a built-in micro SD card reader, and nor does the Prop shield.

    You could get a Teensy 3.5 or...
  35. Raspberry Pi uses the 2x20 pin cable, so at least...

    Raspberry Pi uses the 2x20 pin cable, so at least in maker shops, it should be easy to find.
  36. Teensy USBhost mention in RP2040 feather bring up

    I happened to be listening to the Desk of Ladyada where among other things she talks about bringing up the future feather version of the RP2040. She said that normally she likes to make test jigs...
  37. While I imagine it should work, you might have...

    While I imagine it should work, you might have timing issues if you change things too fast.

    An alternative is to use an I2C multiplexer. These are chips that you hook up the chip to your I2C bus,...
  38. Thread: i2c_t3

    by MichaelMeissner
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    I don't know about i2c_t3, but you can use all...

    I don't know about i2c_t3, but you can use all three I2C ports with the official Wire.h package. Just use Wire1 or Wire2 instead of Wire.
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    Many times this is because you have code in Setup...

    Many times this is because you have code in Setup that does:



    void setup ()
    {
    // wait for things to stabilize
    while (!Serial)
    ;
  40. I bailed in September 2019, and I did get the 50%...

    I bailed in September 2019, and I did get the 50% refund.



    Good luck.
  41. Well one off the wall thought is to add a UART to...

    Well one off the wall thought is to add a UART to USB converter and use one of the hardware serial ports. In theory, something like:

    ...
  42. Note pin 26 (A12) is also a dedicated analog pin....

    Note pin 26 (A12) is also a dedicated analog pin. From a coding point of view, it doesn't matter which pin you use.

    Note, you might want to use A10/A11, and reserve pin A12 if you ever wanted to...
  43. If your board hasn't used them, there are also...

    If your board hasn't used them, there are also pins 24/25 which are analog input only pins (A10, A11) that are on the inside row of pins (pin 25 is next to pin 21, and pin 24 is next to pin 22). You...
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    I2C is a rather slow bus. You might be able to...

    I2C is a rather slow bus. You might be able to boost the speed of the bus by setting the I2C speed from its default setting of 100Khz by using the Wire.setClock function, but it depends on whether...
  45. I just got mail that the Gamedunio 3X Dazzler...

    I just got mail that the Gamedunio 3X Dazzler with a Teensy specific shield for Teensy 4.0/4.1 is now available:

    https://excamera.com/sphinx/store.html#gameduino-3x-dazzler-for-arduino-39

    ...
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    Though in terms of separate pins being available,...

    Though in terms of separate pins being available, there are only 56 pins that are available as gpio pins (out of 75 total pins in the MicroMod connector):

    Pins 1, 7, 33, 36, 39, 45, and 75 are...
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    IIRC, the pins are different between Teensy 3.x...

    IIRC, the pins are different between Teensy 3.x and 4.x. On Teensy 4.x the first CAN device is on pins 22 (TX) and 23 (RX). On Teensy 3.x the first CAN device is on pins 3 (TX) and 4 (RX).
  48. If you wanted stackable headers, Sparkfun sells a...

    If you wanted stackable headers, Sparkfun sells a pair of 24-pin headers + a 5 pin header:

    https://www.sparkfun.com/products/17152
    ...
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    Well, its there but you have to know about it. ...

    Well, its there but you have to know about it.

    If you go to the pinout card, you will see pins 14/15 being documented as S/PDIF out/in.

    If you go into the audio design tool...
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    I haven't yet used S/PDIF, but the Teensy 4.x has...

    I haven't yet used S/PDIF, but the Teensy 4.x has hardware support for S/PDIF using pin 14 for the output pin and pin 15 for the input pin.

    You would need to change:


    AudioOutputSPDIF ...
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