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    https://forum.pjrc.com/threads/61288-define-to-dif...

    https://forum.pjrc.com/threads/61288-define-to-differentiate-between-Teensy-4-0-and-4-1?p=242618&viewfull=1#post242618
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    maybe there is some residual .o files force...

    maybe there is some residual .o files
    force rebuild
    either exit and restart Arduino
    or change a parameter in tools (e.g.F_CPU)
    or delete temp arduino build folder
  3. Why are you asking? the header file always says...

    Why are you asking?
    the header file always says 2.0.0

    Anyhow on jun18 Bill commented
    "..... I have lost interest in developing SdFat."

    So I doubt SdFat we=ill ever become "official"

    BTW,...
  4. So, what about "WebUSB was enabled by default in...

    So, what about
    "WebUSB was enabled by default in Chrome 61 on September 5 2017, but was disabled after privacy and security concerns were raised" (Wikipedia) ?
    Is that still the case?
  5. If you mean by official, that it replaces the SD...

    If you mean by official, that it replaces the SD library in Teensyduino, then someone has to ensure that ALL existing code, that follows the ARDUINO SD API, is running with SdFat-beta.
    Maybe Paul is...
  6. Exactly, all this "programming style" speed...

    Exactly, all this "programming style" speed issues should consider compiler optimization.
  7. So, lets get rid of the stupid 8 bit bool! I,...

    So, lets get rid of the stupid 8 bit bool!
    I, personally thought, to use 16 bit, but maybe should only use 32bit variables.
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    BTW, there is an example mtp-logger in MTP_t4,...

    BTW, there is an example mtp-logger in MTP_t4, which could also be used to test/develp mtp aware data logger.
  9. Thread: Teensy Qt

    by WMXZ
    Replies
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    135,322

    one of the '+' members (e.g. KurtE) can do that

    one of the '+' members (e.g. KurtE) can do that
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    USB2 is setup as a library and should go...

    USB2 is setup as a library and should go completely into local libraries. Not to be selectively copied. Of course, you are free to to so, but that was not the intended operation.

    re usb_desc.h...
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    Cannot comment on MAC, but MTP is NOT a File...

    Cannot comment on MAC, but MTP is NOT a File system, so it would not show up as storage. It should show up as portable device.
    If you search the web for MTP on MAC-OS, you will find that Apple only...
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    AFAIK, there are no *driver*.h files for Teensy....

    AFAIK, there are no *driver*.h files for Teensy.
    I2C interfaces are named different.
    See examples in libraries i2c_t3 and wire
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    PID for MTP-Disk/Serial

    Paul,
    could you please assign a own PID for an experimental MTP Serial that is recognized by Teensy loader, Teensy monitor and would allow automatic reprogramming?
    It would also allow simpler SW...
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    You cannot manipulate Pin13 after initializing...

    You cannot manipulate Pin13 after initializing SPI. So you cannot set it to high by digitalWrite or by using pinMode.
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    @xenington, I see, you have a session close,...

    @xenington,
    I see, you have a session close, this seems 'typical' for Linux. I have on Windows never encountered session close. So, there may be some side effects.
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    There is a printout at the beginning of mtpd.loop...

    There is a printout at the beginning of mtpd.loop that prints out key info of the mtp requests by PC.
    heva a look to this.

    I let it in code for exacly this reason, to see exactly what PC requests...
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    Updated the usb_desc.h to include the missing...

    Updated the usb_desc.h to include the missing defines

    Not sure why it does not work with Nautilus (I'm not using Linux)
    The printout suggests, that the MTP server is not working properly:
    It...
  18. There are multiple users that changed pid/vid of...

    There are multiple users that changed pid/vid of Teensies.
    Only drawback is that Teensyloader does not recognize Teensy in Automatic mode, so Button press (or equivalently connecting Program line to...
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    try with consistent I2S setups e.g. both stereo...

    try with consistent I2S setups
    e.g. both stereo I2S devices
    Stereo I2S is 32 bit/word, and Quad I2S is still 16 bit/word. so frame size does not correspond.
  20. ARDUINO_TEENSY40 ARDUINO_TEENSY41 are used by...

    ARDUINO_TEENSY40 ARDUINO_TEENSY41 are used by startup.c in cores
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    For ExFat you need SdFat-beta

    For ExFat you need SdFat-beta
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    Unfortunately, in my applications, I cannot pull...

    Unfortunately, in my applications, I cannot pull the USB plug, so I must stick to unmount/mount method.
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    OK for Boolean comment. The only way for MTP...

    OK for Boolean comment.

    The only way for MTP responder to tell PC to do something, is to issue an event.
    Unfortunately, all my attempts to do that, failed. I could not find any information what...
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    My interest in MTP was exactly this, to be able...

    My interest in MTP was exactly this, to be able to offload data from a data logger.
    My approach was to either run the logger or the MTP responder
    This was easily done by calling mtpd.loop() only...
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    Try the suggestion posted on MTP-responder thread...

    Try the suggestion posted on MTP-responder thread to improve USB communication, by changing the status function in usb.c
  26. Thread: Future Teensies!

    by WMXZ
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    1,474

    I need low power AND Megabytes (but I know, I...

    I need low power AND Megabytes
    (but I know, I cannot have everything)
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    @defragster IFAIK, it should be 'No directory'...

    @defragster
    IFAIK, it should be 'No directory' file system on SPIFFS.
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    This was noted in other thread. A warning was...

    This was noted in other thread.
    A warning was introduced in the TimeLib Time.h include file.
    On windows this interferes with ALL time.h includes (note case of 't').

    IMO, the TimeLib library was...
  29. So, I tried it, but they do not give you a price,...

    So, I tried it, but they do not give you a price, even if they say in stock!
    a fake company?
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    For the record, my beta-board arrived today...

    For the record, my beta-board arrived today (25-may-2020).
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    maybe cores/teensy4/imxrt.h ?

    maybe cores/teensy4/imxrt.h ?
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    @mjs513, thanks for update. looking forward to...

    @mjs513,
    thanks for update.
    looking forward to see another storage implementation.
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    I like to through in a complete different idea....

    I like to through in a complete different idea.
    measure the phase shift between transmitted and received signal.
    OK, you may first to calibrate the electronic phase shift and you need a frequency...
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    Great, You realize that actual mtp...

    Great,
    You realize that actual mtp implementation has still some debug information, checking with document what every step does was very helpful for me.
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    can you access...

    can you access https://www.usb.org/document-library/media-transfer-protocol-v11-spec-and-mtp-v11-adopters-agreement ?
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    @mjs513, To be honest, the overall structure of...

    @mjs513,
    To be honest, the overall structure of the MTP - storage philosophy was created by the original author.
    AFAIK,
    there was a basic design criteria: to keep a directory structure a linked...
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    OK, let me be clear. There are only 2 versions...

    OK, let me be clear.
    There are only 2 versions MTP+SEREMU and MTP+SERIAL, both are based on usb1_mtp.c for MTP and usb.c for SEREMU or SERIAL
    There is no MTP alone.
    As you can see from this thread...
  38. AFAIK, that is what it is to be expected. That is...

    AFAIK, that is what it is to be expected. That is why you calibrate sensor before and check after usage.
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    There is NO delay(10) . (it was for a while for...

    There is NO delay(10) . (it was for a while for testing only and it does not slow down the transfer)
    Advice: please follow procedure indicated by mjs513
    if seremu does not work, please follow the...
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    I'm aware of it, but I wanted you the pleasure to...

    I'm aware of it, but I wanted you the pleasure to explain it in detail
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    until otherwise told by Paul, I would assume the...

    until otherwise told by Paul, I would assume the pins to read (bottom view from left to right)
    Reset, Program, GND, 3.3V, VBat
    i.e. the same as for T3.5/6
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    Correct, UPS to Italy was 17Euro85 but buying 5...

    Correct,
    UPS to Italy was 17Euro85 but buying 5 T4.1 makes that reasonable and arrived on 3rd day
    I would never ask for UPS or other courier for small value shipments
  43. That is why I use Makefiles for projects that do...

    That is why I use Makefiles for projects that do not need to be Arduino compatible, or where the word Arduino has a bad taste.
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    I ordered a couple on them, so relative shipping...

    I ordered a couple on them, so relative shipping went down
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    You mean, you wanted to use 2nd USB on T4.1 (or...

    You mean, you wanted to use 2nd USB on T4.1 (or 4.0, or even T3.6) as USB device?
    yes, you can do that with purely SW.

    I started with that in https://github.com/WMXZ-EU/USB2 (for T3.6) as I...
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    My beta board has yesterday reached Italy. still...

    My beta board has yesterday reached Italy. still waiting.
    Meanwhile, I ordered some T4.1 from Exp-Tech.de, arrived via USP in no time. (No custom issue within Europe)
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    Another Update suspecting that USB transfer...

    Another Update
    suspecting that USB transfer status is not stable at high CPU speeds
    I activated alternative code in
    file: usb.c
    function: usb_transfer_status
    changed #if 0 to #if 1

    program...
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    copying is a rapid sequence of USB transfers. If...

    copying is a rapid sequence of USB transfers. If they are not terminate correctly, everything gets wrong.
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    Surprise: compiled with option smallest code and...

    Surprise:
    compiled with option smallest code and got it working with speed of 600 MHz.
    makes little sense to me, except optimization is removing some weird coding (side effects).

    Good is that...
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    Confirm that for "MTP_DISK_SERIAL" All my...

    Confirm that for "MTP_DISK_SERIAL"
    All my attempts to clean-up code, delays etc. failed to get it working with higher speeds.
    Probably it needs a USB analyser, which I do not have. That is...
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