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  1. Is the IDE being used to build? It uses the...

    Is the IDE being used to build? It uses the sketchbook copy first, some alternates do not AFAIK.

    Also when Verbose build details are shown - at least from IDE - it points out which library was...
  2. Good work ... >> Not hooked one up yet or...

    Good work ...

    >> Not hooked one up yet or following your code ... but the 32KB cache works across the PSRAM, maybe it is helping as that will transfer at CPU speed if it is covering the data

    I...
  3. Cool. Glad it helped.

    Cool. Glad it helped.
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    p#32 - Windows Perf Issues? Without a specific...

    p#32 - Windows Perf Issues? Without a specific case - and not knowing a single cause ... perhaps link the doc pjrc.com/teensy/td_download.html#antivirus_performance_issue to the posts here on this...
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    p#20...

    p#20 : 'Key Features' table on this page : pjrc.com/teensy/
    > Doesn't include T_4.x details summary - like effective EEPROM space etc.
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    p#18...

    p#18 : PROGMEM .vs. FLASHMEM and Add::
    Memory summary could present EXTMEM info for allocating into PSRAM at compile time
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    p#17...

    p#17 : not done
    https://www.pjrc.com/teensy/td_libs_OctoWS2811.html
    > No mention of Teensy 4: "OctoWS2811 requires the DMA (Direct Memory Access) engine which is available only in Teensy LC & 3.x."
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    This was in p#12 : Interrupts page seems out of...

    This was in p#12 : Interrupts page seems out of date and non-ARM helpful? : pjrc.com/teensy/interrupts.html
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    p#4...

    p#4 :: Might add link to ? :: https://github.com/luni64/TeensyTimerTool on IntervalTimer page?
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    p#36...

    p#36 :: T_4.1 card needs a backside image - at least posted on the web to demark the pads and SDIO pin refs to pin #'s as well as the USBHost like T_3.6 and then the new CHIP pads noted there for USB...
  11. Good luck, sounds like a proper start - there...

    Good luck, sounds like a proper start - there must be some difference that should show.
  12. Does the 'device' have a spec showing the command...

    Does the 'device' have a spec showing the command language? Perhaps it is missing a terminator char or something simple.

    Sounds like it would be a good case for a logic analyzer to monitor the...
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    Indeed it has a lot of both... - that adds some...

    Indeed it has a lot of both... - that adds some clarity.
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    What Teensy is this? ... just noticed I saw 3.5"...

    What Teensy is this? ... just noticed I saw 3.5" and assumed T_3.5 :(

    okay ... so not using the native SDIO SD - but external on the display and it works fine alone, but causes grief when also...
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    Not sure if note below on this page applies the...

    Not sure if note below on this page applies the same to this display :: pjrc.com/store/display_ili9341.html

    We do not recommend using the SD card socket on this display. It does not work, but this...
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    Is the T_3.5 onboard the SD card in use? It has...

    Is the T_3.5 onboard the SD card in use? It has no common connections to SPI as it uses unique SDIO pins. Only an slower external SD on SPI could present this problem.
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    cross posted :( ... as I finished putting 8 items...

    cross posted :( ... as I finished putting 8 items in one post as it seemed they could be marked off as done in that single post without more scanning / searching. The original posts otherwise are...
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    Yes, will look after some of them and edit in...

    Yes, will look after some of them and edit in place - perhaps add notes to this post ...

    Marking them with as approp: * DONE *

    defragster pass #1 complete : 3:44 PM 10/20/2020


    Migrated to...
  19. Doing the T_4.x micros() used the ldrex/strex do...

    Doing the T_4.x micros() used the ldrex/strex do assure two values read [millis tick and the CYCCNT when it was updated] were from the same milli time tick, and it works.

    But the above seems it...
  20. Any chance the lighting is interfering with the...

    Any chance the lighting is interfering with the sensors?
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    Four second wait allows for a couple things - but...

    Four second wait allows for a couple things - but that code will leave the while() and continue as soon as Serial is online whether under 1 second or up to 4 seconds - at 4 seconds it leaves even if...
  22. It is a library installed with TeensyDuino See...

    It is a library installed with TeensyDuino

    See the install directory for :: ...\hardware\teensy\avr\libraries\Encoder\Encoder.h
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    re p#42 - sorry inexact language - just trying to...

    re p#42 - sorry inexact language - just trying to follow the concept ...

    Assumed mainline T_4.x's would not be changed to use this HAB overhead?
    >> If so can the DMAMEM be repurposed...
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    It is running and complete before the computer...

    It is running and complete before the computer has USB Serial connected to display the prints.
    Also the printing is going faster than the PC can make sense of.



    const int graph_size=10000;
    ...
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    See the PDF linked in this post ::...

    See the PDF linked in this post :: DOOM-running-on-the-Teensy-4-1-with-VGA-output


    NOTE: GPIO marked as #1 become #6 after startup code switched GPIO to FAST mode on 1062
  26. Can only suggest anecdotally ... it seems the...

    Can only suggest anecdotally ... it seems the Teensy will get the same info as the PC - hub or not - if the Teensy asks for or records it.

    Might show something looking in CORES code for the MIDI...
  27. If it works from PC, then the info is findable -...

    If it works from PC, then the info is findable - either from midi connect - or from Serial connect finding the Serial number for the device and then doing midi using that 'port' device? KurtE was...
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    If the HAB boot code can be overwritten - the...

    If the HAB boot code can be overwritten - the chip will still only boot from code matching the embedded encryption keys? The fuses enforce that against the internal stored keys right? If the user...
  29. The T_4.0 will always put the Serial# in the...

    The T_4.0 will always put the Serial# in the descriptor AFAIK - maybe the USBHost code doesn't parse that out as written - unless the midi doesn't pass that like Serial always does?
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    Faster QSPI speed can't hurt when used (if chips...

    Faster QSPI speed can't hurt when used (if chips likes it) ... indeed lower DTCM RAM runs at CPU speed, upper malloc/DMAMEM runs at CPU/4 so that can make a big difference when it doesn't run through...
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    Always assumed the bootloader MCU controlled the...

    Always assumed the bootloader MCU controlled the target and pushed HalKay to RAM to run and perform the code loading to target flash - as noted given it controls the JTAG pins.

    If so then when HAB...
  32. T_4.1 with PSRAM soldered to underside does not...

    T_4.1 with PSRAM soldered to underside does not use any 'edge' pins like D34-37 or other? Those pins for bottom chip pads are unique, shown here on this PDF by KurtE...
  33. Perhaps run an example to see it work. Then...

    Perhaps run an example to see it work.
    Then following an example to swap the library and instantiation, the change would come with updates to the buffer - then kicking off the DMA driven update -...
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    Nice, Is the PSRAM access speed setup changed...

    Nice, Is the PSRAM access speed setup changed from 88 MHz to 132MHz? If that is a bottleneck it might be some easy help to performance.

    link here : Teensy-4-1-PSRAM-Random-Access-Latency
  35. @KurtE has developed a DMA based update for the...

    @KurtE has developed a DMA based update for the ILI9341 - it might be this with "Asynchronous Update support (Frame buffer)" :: github.com/KurtE/ILI9341_t3n

    That takes a memory buffer for the...
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    What Paul says of course ... I was assuming new...

    What Paul says of course ... I was assuming new to github to ask?
    It can be done on the web - to be somewhat clearer ... with a github account - go to each file and edit "on Paul's repository" - and...
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    If you go to github and make a Pull Request...

    If you go to github and make a Pull Request - include the changed files - they will be placed online for Paul to review and incorporate.

    Very cool by the way.
  38. Nice work KurtE, ... wondering how fast lines...

    Nice work KurtE,
    ... wondering how fast lines per second test runs across the USBHost Serial ... will see if I can try it before you
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    Seems it should - QSPI reads from FLASH as 'just...

    Seems it should - QSPI reads from FLASH as 'just a pointer'? Can't confirm - but seems that is the case - others may knwo for sure to say not or point to example ???
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    The W25Q256 is 16MB flash. It supports QSPI. For...

    The W25Q256 is 16MB flash. It supports QSPI. For T_4.1 usage it would make sense to use the QSPI capable pads on the bottom side for much better processor supported Quad SPI performance. It would...
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    Indeed no confidential or other markings on the...

    Indeed no confidential or other markings on the 70 page:


    High Assurance Boot Version 4
    Application Programming
    Interface Reference Manual

    COPYRIGHT 2018-2019 NXP

    Or the 73 page:
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    ... Here - the unsecure MD5 value I get is :: ...

    ... Here - the unsecure MD5 value I get is ::

    Algorithm : MD5
    Hash : 3FD303E7450E0F6A97D346B8250E3091
    Path : T:\T_Downloads\cst-3.3.1...
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    I don't have MD5 handy - but updated post #16...

    I don't have MD5 handy - but updated post #16 matches location and size and I see this:



    Name: hab_types.h
    Size: 42373 bytes (41 KiB)
    CRC32: 32B4830E
    CRC64: 3C1830A58D5CFCF6
    SHA256:...
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    Yes, As noted in p#11 - with a 'registered user'...

    Yes, As noted in p#11 - with a 'registered user' login I downloaded the CST.

    Extracted I see this::


    T:\T_Downloads\cst-3.3.1 (2)\cst-3.3.1\docs>dir
    Directory of T:\T_Downloads\cst-3.3.1...
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    This 20 page doc seemed to be readable without...

    This 20 page doc seemed to be readable without login :: nxp.com/docs/en/application-note/AN4581.pdf

    AN4581
    i.MX Secure Boot on HABv4 Supported Devices
    Rev. 4 — June 2020

    There is a new CST...
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    DMAMEM is just the other half of the 1024KB of...

    DMAMEM is just the other half of the 1024KB of RAM on the T_4.x. It is non contiguous so to make use of all RAM requires buffer in both free faster DTCM and the DMAMEM. In this case RAM between the...
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    Good work, thanks for sharing.

    Good work, thanks for sharing.
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    Those ports have full function when properly...

    Those ports have full function when properly wired GND and proper RX<>TX association to a 3.3v UART device - as long as nothing else in software touches those pins beyond Serial4.begin() of...
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    Odd things happen at times :( - I've had doubled...

    Odd things happen at times :( - I've had doubled posts - but never deleted

    That is also Odd because the New MSFT EDGE uses the chrome engine now and works fine - I've not ever used chrome itself...
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    Found the download file it seemed clean - the PUP...

    Found the download file it seemed clean - the PUP was prevented after download - doesn't seem that download site may be clean.

    So looking in the non IDE source tree this is the problem - see post...
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