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    It takes some measurable time to make the change...

    It takes some measurable time to make the change in clock speed. Checked it once some time back - but forget the numbers. It does have embedded while( wait for CPU makes change ); that are not...
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    Thought I saw that noted ... so writing to RAM2...

    Thought I saw that noted ... so writing to RAM2 first would allow it to show on warm restart - but going to power down OFF losing RAM2? Maybe 'abuse' those RTC RAM bytes in case they are preserved?
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    And another FREE PDF MAG ::...

    And another FREE PDF MAG :: raspberrypi.org/articles/programming-raspberry-pi-pico-with-python-and-micropython {nothing PICO in this issue - Opps or the blog}


    Raspberry Pi Pico is programmed...
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    Indeed - when it gets PANIC hot it goes too fast...

    Indeed - when it gets PANIC hot it goes too fast and off without notice as I saw. Seemed some print was noted as added - maybe a hook of the WARN temp could add a log entry? But hooking and handling...
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    "That's" a bit vague? Is the point that starting...

    "That's" a bit vague? Is the point that starting support ASAP make Teensy the natural alternative?

    There is already at least one book published on the PICO - changing those things would be...
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    Indeed it could be a chip that works well up to...

    Indeed it could be a chip that works well up to SPEC speed but has some temp/speed sensitive anomaly going OC.

    Adding a tempMon() print might show something.

    Putting a FAN on it will drop temp...
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    The 'download' link in p#5 notes which versions...

    The 'download' link in p#5 notes which versions of the IDE are supported. For supported versions the installer maintains the needed java files to complete a working install on those known versions....
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    Is this on Windows or other? See this page for...

    Is this on Windows or other?

    See this page for OS specific details in any case : pjrc.com/teensy/td_download.html

    If Windows was it a ZIP or Installer from the Arduino site? Windows Store...
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    ... crossposted as I was unzipping and confirming...

    ... crossposted as I was unzipping and confirming for post #13.

    TeensyDuino only works when and because it modifies the JAVA code installed with the indicated installs - that excludes the Windows...
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    Not sure if this relates or helps? Just did a...

    Not sure if this relates or helps? Just did a fresh UNZIP to :: Directory of T:\arduino_1.8.13_td154Port\
    Created :: Directory of T:\arduino_1.8.13_td154Port\portable

    Opened the IDE and The...
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    Don't see set_arm_clock() disabling interrupts -...

    Don't see set_arm_clock() disabling interrupts - but clock and voltage changes might cause chip interruption/stall to DMA or other timing/processing?
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    As noted it is 'code' and indicated by FrankB -...

    As noted it is 'code' and indicated by FrankB - from raspberrypi.org/documentation/pico/getting-started/
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    SparkFun has it and three Pre-Order variations:...

    SparkFun has it and three Pre-Order variations: $10 Micro, $12 MMOD, $16 Thing+ using the RP2040 MCU.

    Interesting speed but M0+, and "264 kB of embedded SRAM in 6 banks"

    Shared code style might...
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    Yes, just back to desk and I see email arrived. ...

    Yes, just back to desk and I see email arrived. Will be a couple hours and I'll give it a look. 107 is free here ...
  15. Thought so - but had to ask if is was near done...

    Thought so - but had to ask if is was near done and might line up with TD 1.54 now it is incorporated for awesome improvement - those write rates in P#33 are better than the old SD read rates.
    ...
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    Started to write ... that but the p#6 SNIPPET...

    Started to write ... that but the p#6 SNIPPET showed attachInterrupt() after pinMode()'s there - yes - that is how it should be done
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    Great news Paul - big difference supporting a...

    Great news Paul - big difference supporting a known system with (fixed) BOM for in house builds - versus supporting a generic range of items like FLASH chips.
  18. @Bill Greiman - is there a feel for the...

    @Bill Greiman - is there a feel for the coincidence of the 2.0.5 b1 timeline being weeks away from release that might coincide with TD 1.54 for use as SD.h ? ... both of course being unknown? Or is...
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    Snippets are usually a distraction - better to...

    Snippets are usually a distraction - better to have the whole code posted if it can't be cut down to a smaller sketch that effectively shows the problem - that's why this :: Forum Rule: Always post...
  20. Not indicated how many RGB LED's are in use? A...

    Not indicated how many RGB LED's are in use? A photo showing the connections might help.

    Quick guess based on something observed here : that GND wire may be feeding large return current through...
  21. With this edit in...

    With this edit in ...\hardware\teensy\avr\libraries\SdFat\src\SdCard\SdioTeensy.cpp:


    static void enableGPIO(bool enable) {
    const uint32_t CLOCK_MASK = IOMUXC_SW_PAD_CTL_PAD_PKE |
    #if...
  22. Good luck, if you get a working example posting...

    Good luck, if you get a working example posting it may help others and show how to use this feature.

    Had hope that AN would show the 'enable' KurtE mentions, even if for wrong processor - if it...
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    My EE buddy did that for a high school science...

    My EE buddy did that for a high school science project in 1980. Put his TRS-80 on a wheeled robot platform he built - focused light on an open top chip and navigated based on the chip's view of the...
  24. First glance it should be easier on the 1062 with...

    First glance it should be easier on the 1062 with external flash? As long as all needed code for the Flash writes is RAM resident - which user code is by default. But again that is not how the...
  25. As noted in p#6 - Frank personally wrote such a...

    As noted in p#6 - Frank personally wrote such a 'code from SD' - so that was based on experience doing that and a great understanding of the Teensy programming process, not a coin toss - or anything...
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    Quick note - the T_4.0 doesn't have a separate...

    Quick note - the T_4.0 doesn't have a separate AGND - so the other note to 'throw in another' would be needed.
  27. Not seen this come up before - but did find this...

    Not seen this come up before - but did find this app note for a different freescale/NXP processor : nxp.com/docs/en/application-note/AN5245.pdf

    If the 1062 can support it as desired those notes...
  28. not crushed, i.e. discarded without reason - just...

    not crushed, i.e. discarded without reason - just noting a few hurdles making it non-trivial. One of which is the bootloader has one function and limited connectivity only to processor and none to...
  29. Tested to work - Using a T_4.0 with...

    Tested to work - Using a T_4.0 with loglow/TallDog T_4.0 board PCB to present SDIO pins to an SD socket.

    That does not have PSRAM - but with reduced BUFFER it will use processor memory instead...
  30. Indeed - even if that were a supported way to...

    Indeed - even if that were a supported way to upload - where today it only via USB upload - it would take some orchestration overhead to ONLY do it once and not reProgram every time if the SD card...
  31. Added #ifdef note to the PR on the Greiman...

    Added #ifdef note to the PR on the Greiman repository ... tested compile on T_4.1 - but not to run on T_4.0
  32. Indeed that change makes this work in setup(): ...

    Indeed that change makes this work in setup():


    while(runTest(1));


    So this need changed and also the :: "#if defined(ARDUINO_TEENSY41) "

    Should also include :: #if...
  33. That is in the spot of code noted in p#14. ...

    That is in the spot of code noted in p#14.

    Those "#if defined(ARDUINO_TEENSY41) " in "static void enableGPIO(bool enable) {" would preclude that from working on Teensy 4.0 with SDIO soldered on...
  34. Closest is the below in :...

    Closest is the below in : ...\hardware\teensy\avr\libraries\SdFat\src\SdCard\SdioTeensy.cpp


    #elif defined(__IMXRT1062__)...
  35. Not finding : SDHC_ReleaseGPIO() In TD 1.54...

    Not finding : SDHC_ReleaseGPIO()

    In TD 1.54 sources here?
  36. Edited the code to work with TD 1.54 b5: ...

    Edited the code to work with TD 1.54 b5:


    #include <SD.h>
    #include <SPI.h>

    //...
  37. Also note - there have been posts like "tried...

    Also note - there have been posts like "tried Paul's PSRAM test and it passed" - but then other usage fails until solder joints are reflowed or cleaned.

    Noted as: "large file named TESTFILE.BIN" -...
  38. Have not seen this noted as done or tried or done...

    Have not seen this noted as done or tried or done it here.

    The TeensyDuino 1.54 Beta 5 has integrated a release version ( not Beta ) of the Greiman SdFat to replace the standard SD library.

    Not...
  39. The T_4.1 uses 480 Mbps USB. As presented (if I...

    The T_4.1 uses 480 Mbps USB. As presented (if I read right) by @KD5RXT-mark there is less disturbance and rerouting of the USB 'D' signal lines where it seems they are uninterrupted from the original...
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    That's great. When the version to release is...

    That's great. When the version to release is assembled I'll look to get back and test it out when the code to be included is known and in one place.

    Having the 1062 bootloader chip ready for the...
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    Anything that provides simple info logging would...

    Anything that provides simple info logging would be cool. As noted your On_Restart T_4 display is an awesome extension for HardFaults.

    That's where I got bogged down - tying to add generic debug...
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    Things like that seem like a good addition to...

    Things like that seem like a good addition to take the mystery out of a Teensy that 'just stops' - it doesn't generally happen - but when such things do happen it is an opaque puzzle.

    And future...
  43. Forum search on "SCB_AIRCR" will find it...

    Forum search on "SCB_AIRCR" will find it liberally noted back to T_3.0 days IIRC - one might have comforting details - again IIRC from reading it is the common ARM way to do it.
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    For an advanced view of 1062's DMA and GPIO see :...

    For an advanced view of 1062's DMA and GPIO see : (arduino)\hardware\teensy\avr\libraries\OctoWS2811\OctoWS2811_imxrt.cpp

    There are some other comments - but this is the biggest one:

    //...
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    Nice work! >> and colon >> characters:...

    Nice work! >> and colon >> characters: ":/0123456789" and space.
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    Sticky: Updated Post #1 - PJRC/Paul has indicated it...

    Updated Post #1 -

    PJRC/Paul has indicated it is NOT planning to produce a public WIKI.

    There is a GROWING USER WIKI :: TeensyUser/doc/wiki
    > please look and participate there.
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    @Paul - possible to add a note for NativeEthernet...

    @Paul - possible to add a note for NativeEthernet on the T_4.1 hardware page? The hardware is discussed - but no link to the library to use for support ... recent user post made note of that ...
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    Here is that library thread ::...

    Here is that library thread :: T4-1-Ethernet-Library
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    There is a software reset function FrankB just...

    There is a software reset function FrankB just noted in this post:
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    That need to send the 'address array' is where...

    That need to send the 'address array' is where the Teensy's MAC will be written when the code shown above is executed. 'just supply' means allocate the needed 6 byte variable and pass to the...
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