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  1. Thread: Teensy 5.0 ?

    by WMXZ
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    54

    com'on, there are multiple posts and threads...

    com'on, there are multiple posts and threads about this!
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    You can easily ignore lack of USB connection...

    You can easily ignore lack of USB connection
    Yes, it fills-up a buffer, but when this buffer is full all further data are dropped.
    You can see that by writing data to USB, disconnecting USB from PC...
  3. the constant is a float (single and not double)

    the constant is a float (single and not double)
  4. see post #2 now you have to remove the -6.0f ...

    see post #2
    now you have to remove the -6.0f
    (6db is equivalent to a amplitude factor of 2)
  5. because of factor 2

    because of factor 2
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    You always can use SDIO protocol (even if nobody...

    You always can use SDIO protocol (even if nobody has done so far AFAIK)
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    This is partially done in Serial, but I agree...

    This is partially done in Serial, but I agree that checking for open session is a good idea, especially as PC will time out MTP when session is not established for some time (have not established...
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    In MTP I'm using extern volatile uint8_t...

    In MTP I'm using

    extern volatile uint8_t usb_configuration;
    to know if usb is configured (taken from other devices)
    it is 0 when not initialized
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    I'm afraid that I have no experience with midi,...

    I'm afraid that I have no experience with midi, but I can tell you that the 2nd usb was modelled after T4 so T4 midi would be a good starting point.

    But if you wanted to take on the challenge, I...
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    https://github.com/WMXZ-EU/USB2 I did it for...

    https://github.com/WMXZ-EU/USB2
    I did it for T3.6 but have not ported this functionality to T4
    (too busy with priority job)
  11. Thread: Raspberry Pi Pico

    by WMXZ
    Replies
    120
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    3,439

    can or must?

    can or must?
  12. Replies
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    which teensyduino?

    which teensyduino?
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    have a look onto schematic: VBAT-pin and 3.3V are...

    have a look onto schematic: VBAT-pin and 3.3V are combined with diodes to go to Teensy
  14. Replies
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    I tend to disagree what-ever system is...

    I tend to disagree
    what-ever system is pre-loaded, you will find people that complain or want something else.

    I like the idea of having only the blink preloaded to prove functionality of a new...
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    I only wanted to clarify the "d - first dump list...

    I only wanted to clarify the "d - first dump list of storages" option
    this prints out the relevant info of the index file, mtp uses to access the files.
    It is only useful during development and...
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    One application of MTP is to transfer files,...

    One application of MTP is to transfer files, while the Teensy is not accessible, so disk access should IMO be optimised.
    If this can be done using info from filesystem, so better. Yes, FS.h should...
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    Well, I only adapted the original code to my...

    Well, I only adapted the original code to my needs and made it available.
    I understand that Paul is interested to integrate it at some time, but he seems to be busy with other (hopefully pleasant)...
  18. Replies
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    The 2.9 ms is result of acquisition buffer (128...

    The 2.9 ms is result of acquisition buffer (128 samples) and sampling rate (44.1 kHz) so you must change one of the two values to change the delay.
    This requires changing some basic parameters. It...
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    They cannot be 180 deg out of phase. there is a...

    They cannot be 180 deg out of phase. there is a fixed travel time through the audio library
    Output is NEVER without delay to input.

    AFAIK
    I2S-input: data are buffered for 128 samples (2.9 ms...
  20. Replies
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    the way it is wired now, connect audio signal to...

    the way it is wired now, connect audio signal to both line in and oscilloscope channel 1 to ,say, left and channel 2 to right
    you could simplify, by connecting both amp inputs to same i2s input...
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    sorry about formating here is the audio code ...

    sorry about formating
    here is the audio code

    #include <Audio.h>
    #include <Wire.h>
    #include <SPI.h>
    #include <SD.h>
    #include <SerialFlash.h>

    // GUItool: begin automatically generated code
  22. Replies
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    no, I was suggesting i2s ->mixer (+1) -> I2S...

    no, I was suggesting
    i2s ->mixer (+1) -> I2S left
    |-> mixer (-1) -> I2S right
    so left and right path have same internal delays
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    if you insert an audio object then you have to...

    if you insert an audio object then you have to consider a 128 sample delay.
    So, insert two mixers in parallel one with +1 and the other with -1, then you should get the desired effect
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    the SPI speed and the CPU speed are total...

    the SPI speed and the CPU speed are total different clocks
    .
    However, if you use code where SPI clock speed is derived from CPU clock then you may run into issues.
    If this happens in old low...
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    use SPI1.beginTransaction(SPISettings(4'000'000,...

    use
    SPI1.beginTransaction(SPISettings(4'000'000, MSBFIRST, SPI_MODE0));

    spi commands

    SPI1.endTransaction();

    or similar to control SPI speed (here 4 MHz)
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    which library you are using? could not find a...

    which library you are using?
    could not find a MPU9250 for SPI that is compatible with your code
  27. Replies
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    I use 5 lines into my waterproof housing ...

    I use 5 lines into my waterproof housing
    Voltage, Ground, USB D+, USB D-, Program line
    this allows me to reprogram Teensy at all circumstances.
  28. Yes but SE A10,A11 are Differential (it is...

    Yes but SE
    A10,A11 are Differential (it is clearly written)
  29. Replies
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    I corrected the Readme file (thanks for pointing...

    I corrected the Readme file (thanks for pointing out)

    re TyCommander, I'm not using this, so I cannot comment
    If you update boards.txt (modifications for teensy_avr) then there should be two...
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    USB mode is fixed at compile time. You can use...

    USB mode is fixed at compile time.
    You can use MTP with Serial if you install MTP from https://github.com/WMXZ-EU/MTP_t4 and follow instructions
  31. Replies
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    I had that too, but having storageID above 16 bit...

    I had that too, but having storageID above 16 bit did not change anything.
    I know it violates the document, but coding was simpler.

    one events:
    notifying every new file, for me is not an option,...
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    maybe one needs an ISR also for events. don't...

    maybe one needs an ISR also for events. don't think TX ISR is called.
  33. Replies
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    @KurtE On T3.x, my interpretation was that after...

    @KurtE
    On T3.x, my interpretation was that after malloc you need also a free, but I may be wrong.
    So I use always the same buffer for multiple events, assuming that I will not send multiple events...
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    BTW, My Github has also a tested T3.6 version...

    BTW,
    My Github has also a tested T3.6 version on events included (in MTP.cpp)
    I would keep event handling outside cores
    I did a couple of days ago a PR on teensy3/usb_desc.h to have tx events,...
  35. Replies
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    MTP per se does not need Serial connection, but...

    MTP per se does not need Serial connection, but MTP is usually integrated in other programs that need serial connections.

    Seremu without Arduino monitor is a little bit complicated.
    Consider...
  36. Replies
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    @KurtE, Yes I'm following your modifications and...

    @KurtE,
    Yes I'm following your modifications and try them out.
    There are couple of things I may have a different starting point, so I'm curious to see how they work out.
    So please go ahead with...
  37. Replies
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    That is my observation also. F5 seems to be...

    That is my observation also.
    F5 seems to be necessary
  38. Replies
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    and 3 characters after the "."

    and 3 characters after the "."
  39. Teensy4.x are 3.3V I/O so do do not want a board...

    Teensy4.x are 3.3V I/O so do do not want a board that is made to interface with a 5V board.
    5V in Teensy4 pins may kill these pins
  40. Replies
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    what about extmem_malloc(size) as used in...

    what about

    extmem_malloc(size)
    as used in LittleFS_RAM of LittleFS library?
  41. Replies
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    Chip, mtp-test.ino does work now with T3.6 to...

    Chip,
    mtp-test.ino does work now with T3.6
    to use USB_MTPDISK_SERIAL you need to copy the desc.h parts into desc.h cores files
    if you prefer to use old mtpdisk (seremu) you should edit desc.h to...
  42. Replies
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    Chip, Have not integrated yet events to T3.6....

    Chip,
    Have not integrated yet events to T3.6.
    I'm still testing with T4.1 (my real application runs on T4.1)
    T3.6 needs own usb interface so it needs a mind-change to get integrated.
    otherwise it...
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    Chip you mean N_k = (Q * f_s) /f_k anyhow,...

    Chip
    you mean
    N_k = (Q * f_s) /f_k

    anyhow, it does not matter, as one can use FFT to approximate the spectral resolution (with summing of bins), then one can sum the temporal bins to...
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    AFAIK N_k * f_k = Q*f_s N_k window length...

    AFAIK
    N_k * f_k = Q*f_s

    N_k window length
    f_k center frequency
    f_s sampling frequency

    see e.g. https://en.wikipedia.org/wiki/Constant-Q_transform
    Obviously, one needs to read a little bit...
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    Chip, I would not call it "approximation to...

    Chip,
    I would not call it "approximation to constant-Q", as a simple logarithmic frequency scale (logarithmic summing frequency bins) is equivalent to a logarithmic Q.
    In how far logarithmic...
  46. Replies
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    The OP and title asks about constant Q and not...

    The OP and title asks about constant Q and not "logarithmic" spectrograms.
    constant Q indicates "logarithmic" spacing of frequencies AND therefore also logarithmic changes in window size.
    summing...
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    As Q is related to the time-frequency product you...

    As Q is related to the time-frequency product you "only" need to implement 96 DFTs, each with own window size.
    Edit: Not sure is there is a DFT object in Audio library, but you can easily write one...
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    @KurtE Re storageID, I knew this and have...

    @KurtE
    Re storageID, I knew this and have thought to separate physical and logical storage, but in the end I let everything as 1 physical storage (0<<16) and consider all storage as logical. I know...
  49. Replies
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    After commenting to @mborgerson, here a first...

    After commenting to @mborgerson, here a first success
    I succeeded to provoke a PC response using an event.
    Using a device reset event PC reopened a new session. I updated the MTP github.
    in MTP.h...
  50. Replies
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    Correct, If PC initiated a session, and you open...

    Correct, If PC initiated a session, and you open a directory in file explorer MTP responder tells MTP initiator (PC), how many files are in this directory. If Teensy the writes additional files, PC...
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