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  1. Thanks Frank - here is a starter sketch: ...

    Thanks Frank - here is a starter sketch:


    void setup() {
    // put your setup code here, to run once:
    Serial.begin(115200);
    while (!Serial && millis() < 4000 );
    Serial.println("\n" __FILE__...
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    It is now ... with @AlexisJohn a first time...

    It is now ... with @AlexisJohn a first time poster with no example code or specifics posted it seemed like a good starting point to clarify :)

    ADC was just updated to support T_4.0 in latest TD...
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    If using on the same pins there will be a...

    If using on the same pins there will be a conflict as the ADC library needs to be in control of those pins. Is that the desired use case?
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    Teensy 4.0 does have USB Host software code...

    Teensy 4.0 does have USB Host software code working for ps4 controllers and Bt dongle if that was the goal - there is a thread on that with test usage - titled as USB Host T_3.6 in some fashion...
  5. Would be nice to have notice of Power OFF start. ...

    Would be nice to have notice of Power OFF start. Of course starting a timer to notify if the Power OFF was cut short and not actualized, or having it be a CHANGE interrupt where the return to HIGH...
  6. Give this article by Paul a read :...

    Give this article by Paul a read : https://www.pjrc.com/better-spi-bus-design-in-3-steps/

    CS pins should be pulled HIGH when the device is not to be addressed. The CS pin to a single device must...
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    resolved ...

    resolved ...
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    Sticky: Can you post a simple repro example/steps? Not...

    Can you post a simple repro example/steps? Not sure how '@ 2M baud' relates as USB Serial is always at USB max throughput - and that was stepped up between TD 1.48 and 1.49.


    Does this change...
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    Looking at INPUT_DISABLE it changes the...

    Looking at INPUT_DISABLE it changes the hysteresis handling of the pin. That explains why it was resistant to change mid-value as shown in post #10


    } else { // INPUT_DISABLE
    *(p->pad) =...
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    Frank - assuming the public details are limited...

    Frank - assuming the public details are limited to the NXP link on p#1. There is the same single DOCUMENTATION on that link that was there with minor added details to the main page. Looking there...
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    Assuming Paul had an idea to know to suggest this...

    Assuming Paul had an idea to know to suggest this and follow-up is coming. Perhaps a change to be made in pin setup in analog read usage so it just works ...
  12. this is a duplicate thread to...

    this is a duplicate thread to pjrc.com/threads/59109-How-to-read-the-output-from-a-preprogramed-teensy

    Closing it
  13. If the Teensy is setup to print data out the USB...

    If the Teensy is setup to print data out the USB port that will show with a terminal program on USB - the Arduino IDE has such a Serial Monitor program. If the TeensyDuino software is installed...
  14. Sounds nice and makes sense if it speeds...

    Sounds nice and makes sense if it speeds re-compile time. Though something seems worse in handling between IDE 1.8.9 and 1.8.10 where it seems some things get rebuilt more often - but that hasn't...
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    With Teensduino 1.49 released - if this...

    With Teensduino 1.49 released - if this reproduces on that version like in post #10 - this would be worthy of a new thread perhaps with notes and observations summarized there for investigation.
    ...
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    analogRead() blocks for some short time doing the...

    analogRead() blocks for some short time doing the read - not sure if it has any other side effects - but apparently as used it is bad to have in an _isr() and that isn't surprising.

    For fast and...
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    Indeed the " __IMXRT1062__ " signifies the...

    Indeed the " __IMXRT1062__ " signifies the Teensy_4.0 processor.

    As for extra hardware - if it can repro in a simple case just dropped into IDE and run on a nearly bare T_4 that would allow anyone...
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    Very interesting to see how it resolves. With...

    Very interesting to see how it resolves. With twin CPU's one each of M4 and M7 core type and speed - versus two equivalent same speed cores like ESP32 where they built with a version of RTOS to hide...
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    Can a demonstrative sample be posted - minimal...

    Can a demonstrative sample be posted - minimal and complete to work without extra hardware? Details on timing frequency and such may be an issue.

    Changing the period only happens at the end of a...
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    Sticky: Good info. Didn't know the upgrade cleanup was...

    Good info. Didn't know the upgrade cleanup was limited to core files.

    I was going to note that personal edits of added files will not be touched, and that library adds/edits should be done in...
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    Sticky: Yes, A newer installer will properly overwrite...

    Yes, A newer installer will properly overwrite prior versions with all the new code and utilities.
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    T_4.0 has a fully operational RTC Hardware...

    T_4.0 has a fully operational RTC Hardware section - and running from vBat power maintains operation when Teensy otherwise Off.
  23. I just swapped out 256GB SSD on PC labelled 5V...

    I just swapped out 256GB SSD on PC labelled 5V 1.7A. I put in a new 512GB SSD that said writes take 3.3W or 0.66A if at 5V. The 2011 Teensy Test 120GB SSD says 5V at 1A. So none of these would run...
  24. Indeed - only needed with a HUB - and except...

    Indeed - only needed with a HUB - and except FLASH drives or powered external drives - my bare HDD's and SSD's all require a HUB for power.

    I just bumped buffer from 8 to 32 with uint32_t array of...
  25. Wow - so long ago ... Latest commit on Dec 11,...

    Wow - so long ago ... Latest commit on Dec 11, 2016

    This was used to use Teensy to pass through Serial as Arduino programmer for the ESP8266 - then share data with ESP over serial when running:...
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    Minor indeed ... Maybe memory will be better then...

    Minor indeed ... Maybe memory will be better then :) - just thought of it again after months seeing it in 1.48 beta #3 ... and that is not in github code to post a fix ......
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    @Paul - Boards.txt still shows this Just...

    @Paul - Boards.txt still shows this


    Just checked again that still the gives 996 MHz at runtime:


    35C loopTime=357230 run mins=0.157983 F_CPU=996000000


    with this:
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    Sticky: Look at photo images on PJRC.com for the Teensy...

    Look at photo images on PJRC.com for the Teensy 4. A bit soon and complex for it to be cloned - and if so not likely to have the exact layout and colorization and silkscreen.

    Did it come with a...
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    No problems here in the couple of things I've...

    No problems here in the couple of things I've done. The i2c twin ssd1306's on a T_4.0 are running fine:


    Used the IDE to compile and upload a few sketches more than a few times after 1.49b5 on...
  30. USBHost thread has a decent usable library for...

    USBHost thread has a decent usable library for Flash/HDD/SSD drive attachment and access.

    It seems that was updated to TeensyDuino release copy?

    Though that thread uses MSC and uSDFS libraries.
  31. With more console output that could be seen where...

    With more console output that could be seen where it shows what libraries are used from where.

    IDE's "ctrl+comma" shows file/prefs and 'sketchbook' folder - that folder with be where 'libraries'...
  32. Given Paul's post above - it might be resolved...

    Given Paul's post above - it might be resolved with an update to the latest TeensyDuino. 1.48 has been released and 1.49 is in Beta and likely to be released in the next day - with no changes so far...
  33. This may be a board or version specific problem...

    This may be a board or version specific problem ... can you add details ...

    What Teensy is selected for the Board? Which IDE and TeensyDuino version?
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    Just a post for historical reference info on...

    Just a post for historical reference info on @tannewt and adafruit/circuitpython this bug fix date:


    Will be interesting to see it evolve for Teensy.
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    No doubt 4.1 EEPROM not top of list and easy to...

    No doubt 4.1 EEPROM not top of list and easy to decide before it ships - but the context was here - and you saw it :)

    As far as schedule ... it has been a typical or worse holiday season for...
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    @PhillippeA: Best to try 1.49b5 to see - there...

    @PhillippeA:
    Best to try 1.49b5 to see - there were i2c changes for robustness.

    Manual reset is typically only when USB Serial gets functionally broken with bad code, or the code prevents the USB...
  37. This cross-posted while sleeping on the last...

    This cross-posted while sleeping on the last post. Any self made will not have a unique Serial # until burned into the MCU area. Mixing and matching may confuse the PC.
  38. Interesting - that is quite right - they should...

    Interesting - that is quite right - they should be unique once they are ID'D. PJRC has process in place to assign unique Serial #'s.

    Not seen this before on Windows - don't know OS in use? IDE and...
  39. Have either or both been programmed with a sketch...

    Have either or both been programmed with a sketch from new? A sketch with USB Serial active? Even Blink?

    If the IDE and TeensyLoader are used to install even a blink sketch with USB Serial they...
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    T4 internal temp report of 35-50C is typical at...

    T4 internal temp report of 35-50C is typical at 600 MHz - depending on sketch and ambient temp and what is soldered to T_4 for heat dissapation. Internal can report higher values - but 1062 chip...
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    CircuitPython-on-Teensy-4!...

    CircuitPython-on-Teensy-4!

    ... closed for this dev thread ...
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    Installed TD 1.49b5 on IDE 1.8.10 on Win 10 no...

    Installed TD 1.49b5 on IDE 1.8.10 on Win 10 no trouble.

    Tested SSD1306 i2c on a Teensy 4.0 FRDM board with native Wire pulled out and it worked, wired second display to Wire1 (also Wire2) and it...
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    Not sure of the details and future form - but the...

    Not sure of the details and future form - but the new restrictions on Mac Secure install led to this after some effort and signing work by Paul AFAIK
  44. No problem - just saw room for confusion. IDE...

    No problem - just saw room for confusion. IDE maintains a 'sketchbook' folder. In that folder place a folder 'libraries' and any library found there will be used before a same library from standard...
  45. That shows the TeensyDuino install library...

    That shows the TeensyDuino install library location - is that were the latest Github Download was installed? The latest T_4 version isn't included in a TeensyDuino install yet AFAIK.
  46. There was a recent (some months back) condition...

    There was a recent (some months back) condition resolved where UART serial would get in a state it didn't recover from when an error was detected. That was a true end of data error or something that...
  47. The samples included with the " ili9341t3N " have...

    The samples included with the " ili9341t3N " have been tested and perhaps updated as needed to work with the Teensy 4 - but based on the following the Teensy 4 connects and works not unlike the...
  48. Amazon shows 5 packs...

    Amazon shows 5 packs (mix 3/3/6/6/10ft) for $12. other various combos $3-5 each common

    My Samsung 2+ yrs old had USB-C and I found decent extras.

    I got some ESP-32 units that came with a USB-C...
  49. Unless there is loop(){while(1);} the loop() will...

    Unless there is loop(){while(1);} the loop() will cycle, may as well use it, especially since it keeps running.

    Even if this conflict was found and resolved there may be another down the road -...
  50. Problem - missing code - add the red code: ...

    Problem - missing code - add the red code:



    #include "uSDFS.h"
    // for use of USB-HUBs
    #include <USBHost_t36.h>
    extern USBHost myusb;
    USBHub hub1(myusb);
    USBHub hub2(myusb);
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