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    I decided to reverse course on this. All...

    I decided to reverse course on this. All programs will be back to having 512K DMAMEM & heap available on Teensy 4.0 & 4.1.
    ...
  2. The schematic on the website has been updated to...

    The schematic on the website has been updated to fix this mistake.
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    As with almost everything in the audio library,...

    As with almost everything in the audio library, detailed documentation is in the design tool right-side panel.

    https://www.pjrc.com/teensy/gui/?info=AudioInputI2Sslave

    One difficult issue you...
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    Fixed it just now

    Fixed it just now
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    Updated, now says "Teensy LC & 3.x & 4.x". ...

    Updated, now says "Teensy LC & 3.x & 4.x".




    Under "Hardware Requirements" the page does say:



    I've added "Teensy 4.x boards support use of any set of pins, not limited to only 8 fixed...
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    Fixed Fixed FLASHMEM for code usage, added...

    Fixed



    Fixed FLASHMEM for code usage, added EXTMEM.




    Added a link under "Memory Expansion".
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    @Degragster - Any chance I can talk you into...

    @Degragster - Any chance I can talk you into re-writing the guidance in msg #24 in a step-by-step style?

    I want to put this on the download page. But the conversational style of msg #24 isn't a...
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    Added under "Other Libraries". Added...

    Added under "Other Libraries".




    Added some time ago...

    https://www.pjrc.com/teensy/gui/?info=AudioEffectRectifier
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    Updated this page.

    Updated this page.
  10. Confirmed, the schematic had an error for the...

    Confirmed, the schematic had an error for the signals connected to 38/DAT3 and 39/DAT3 on Teensy 4.0. I've updated it.
  11. This probably can work if the I2S devices you...

    This probably can work if the I2S devices you connect to Teensy are slave mode. In other words, Teensy transmits all the clock signals, those device always receive and never try to transmit their...
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    At least for Teensyduino 1.54-beta1, I'm going to...

    At least for Teensyduino 1.54-beta1, I'm going to reduce DMAMEM max size from 512K to only 504K.

    In the future we might provide a mechanism for programs wishing to access the HAB logfile to...
  13. Every SD card I have used seems to be able to...

    Every SD card I have used seems to be able to properly tri-stat its MISO pin.

    But if you have any doubt, the way to check involves using only the SPI device in question with 2 resistors on the...
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    Please, put 1 issue per message, so it's easier...

    Please, put 1 issue per message, so it's easier to mark completed stuff as no longer needing attention.
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    @Kurt & Defragster - could I talk you into...

    @Kurt & Defragster - could I talk you into reviewing all the messages on this thread and adding something like "still needs work" or "fully resolved" or "no issue" at the top of each one?

    My hope...
  16. No, sorry, the bootloader only supports...

    No, sorry, the bootloader only supports programming over the main USB device port.
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    I'm pretty sure FlexSPI only supports master...

    I'm pretty sure FlexSPI only supports master mode. On Teensy 4.0, those pins only connect to the W25Q16 flash chip, so you can't access the FlexSPI peripheral.

    Teensy 4.1 does make FlexSPI2...
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    TimeLib defaults to starting at 0 and is meant to...

    TimeLib defaults to starting at 0 and is meant to sync to a source of accurate time.

    Teensy has a RTC which keeps track of date/time. That RTC is set automatically to your PC's time on every...
  19. I'm so glad you tested this! Whether 125us...

    I'm so glad you tested this! Whether 125us response is actually possible from PCs been on my list of things to someday check. Almost all of my testing has involved looked at the USB packets with a...
  20. Officially, PJRC only tests and supports this...

    Officially, PJRC only tests and supports this Linux-based software on Ubuntu, and only Ubuntu running on real hardware (not virtual machines). Most other Linux systems tend to work, but we don't...
  21. Are you using a Teensy board? This forum is...

    Are you using a Teensy board? This forum is about Teensy.

    If you're using Arduino Nano, you should probably ask on Arduino's forum.

    https://forum.arduino.cc/

    Obviously for advice specific...
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    Indeed, when PJRC sells a Teensy without certain...

    Indeed, when PJRC sells a Teensy without certain fuses set, there will be many possible paths to bricking those boards.




    I hope you can understand 2 less than ideal realities of this...
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    Yes, that's more or less it.

    Yes, that's more or less it.
  24. It rounds to the nearest integer. Or at least it...

    It rounds to the nearest integer. Or at least it did in the days when AUDIO_SAMPLE_RATE was expressed as an integer.
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    It will get rounded to the nearest 1/24th of a...

    It will get rounded to the nearest 1/24th of a microsecond, if the PIT timer clocks at its default 24 MHz. Or rounded to 1/150th of a microsecond if you clock the PIT at 150 MHz.




    The PIT...
  26. For the audio shield (rev D) you should use...

    For the audio shield (rev D) you should use AudioInputI2S, not AudioInputI2S2.

    As with all the audio library features, detailed documentation is in the design tool's right-side panel.
    ...
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    Yes, you're right. I was re-reading...

    Yes, you're right. I was re-reading HAB4_API.pdf. Indeed it is documented in chapter 4 and the constants in chapter 6. Like so much of NXP's documentation, it's quite difficult to read if you...
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    Looks like your program is able to parse the CSF...

    Looks like your program is able to parse the CSF commands!




    Where did you find documentation about the CSF data format?
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    Awesome news! The best way is to fork...

    Awesome news!




    The best way is to fork the code on github, then check out your fork, edit the files, commit the changes, push the changes to github, and then on github website create a pull...
  30. It is possible, but only if you edit the core...

    It is possible, but only if you edit the core library USB code.
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    Add this in setup: while (!Serial) ; //...

    Add this in setup:


    while (!Serial) ; // wait for Arduino Serial Monitor to open

    or this if you want it to run after a few seconds even if the PC doesn't respond


    while (!Serial &&...
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    Just to make sure I answer these questions.... ...

    Just to make sure I answer these questions....




    Let's assume NXP / Freescale fixed this problem and their documentation on page 205 in the reference manual, and pretty much everywhere else in...
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    Ok, I've create a repository on github with all...

    Ok, I've create a repository on github with all of my work-in-progress HAB stuff.

    https://github.com/PaulStoffregen/hab_tests

    I wrote a readme file with (probably rough-around-the-edges)...
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    Oh, that's very good news! Does it also have a...

    Oh, that's very good news!

    Does it also have a copy of hab_types.h in code/cst/code/front_end/hdr? File size should be 42373 bytes. MD5 should be 3fd303e7450e0f6a97d346b8250e3091.
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    For the next Teensyduino beta, I will reduce the...

    For the next Teensyduino beta, I will reduce the DMAMEM region slightly, so we aren't overwriting the HAB logfile in OCRAM. I'll also update the boot vectors with the CSF address. That will at...
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    Are you sure? That's not what NXP's IMXRT1060...

    Are you sure? That's not what NXP's IMXRT1060 reference manual says (or seems to say).

    22081

    Unless I've somehow misunderstood these words, my understanding is we can burn the SRK hash into...
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    The reason why is involves some history of...

    The reason why is involves some history of Arduino. It's really just C++ and from the beginning everything used ordinary C strings. Even though the String C++ class was added to Arduino about 10...
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    No, it will not work. Any MKL02 chip you buy...

    No, it will not work.

    Any MKL02 chip you buy from distributors will come blank, which obviously will not work. Even if you desolder a MKL02 chip from a Teensy 4.1 and try to reuse it, your board...
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    Whether the gaurd ring matters really depends on...

    Whether the gaurd ring matters really depends on the type of signal which you route close to the crystal. For example, the reset signal doesn't actually change voltage while the chip runs, so it...
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    Please read the suggestions for the crystal on...

    Please read the suggestions for the crystal on the MKL02 page:

    https://www.pjrc.com/store/ic_mkl02.html

    Scroll down to "Crystal Guidelines".
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    It is 800 kbps.

    It is 800 kbps.
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    I could use some help with HAB. Months ago, I...

    I could use some help with HAB. Months ago, I spent some time trying to use NXP's CST program (version 3.3.0) to add the CSF to compiled images, and I burned the SRK hash into the fuses, but I never...
  43. Yes. Just use pinMode(12, OUTPUT) any time after...

    Yes. Just use pinMode(12, OUTPUT) any time after SPI.begin() to take control of the pin again. The other modes like INPUT & INPUT_PULLUP work too.
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    Don't call pulseIn() from your sendData()...

    Don't call pulseIn() from your sendData() function. Do it in loop() and store the results in databuf[]. Your sendData() function should be as simple as possible because it runs from an interrupt.
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    Just a blind guess since I can't see any code...

    Just a blind guess since I can't see any code here, but we know you're using I2C slave mode. Keep your onRequest function as simple as possible, since it gets called from interrupt context. Best to...
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    Ah, now we can see a detail you didn't mention...

    Ah, now we can see a detail you didn't mention earlier. You're using SoftwareSerial. On Teensy 3.5, looks like SoftwareSerial only "knows" the pin numbers for Serial1 to Serial3.

    To use Serial4...
  47. As a quick test, I ran this here on a Teensy 4.0....

    As a quick test, I ran this here on a Teensy 4.0. I don't have that particular DAC, so I just viewed the waveforms with my oscilloscope.

    22063

    Amazingly it seems to be working, except that...
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    It could be wires not connected properly. Or it...

    It could be wires not connected properly. Or it might be a mistake or misunderstanding in the code. Yeah, I know that's pretty obvious and covers all the bases, could be either hardware or...
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    Indeed, the ADC shouldn't do this. The pin...

    Indeed, the ADC shouldn't do this. The pin should be a high impedance when used as analog input.
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    Teensy certainly can act as a USB keyboard, mouse...

    Teensy certainly can act as a USB keyboard, mouse and joystick. To see how you would do this, install Arduino & Teensyduino. You can get the software here.
    ...
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