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  1. Replies
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    Bill, Paul, not sure if I divert too much, but...

    Bill, Paul,
    not sure if I divert too much, but could it be similar to the following observation:
    I fail to SPI 'mount' a 1 TB uSD on T4.1 if the disk is nearly full but I ' mount' the disks easily...
  2. @zlp yes, that sounds right Meanwhile I added a...

    @zlp
    yes, that sounds right
    Meanwhile I added a _I2S_SGTL5000 symbol to config.h and changed a little bit the main program to make use of, and changes for audio board a little bit easier
  3. @zlp there are two issues - typo:...

    @zlp
    there are two issues
    - typo: "audioshield.inputSelect(AUDIO_INPUT_LINEIN)" has "s" and not "S" (this results in error)
    - the calls to audioShield.xxxx must be within setup()
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    @teensyUsr when installing Teensyduino and if...

    @teensyUsr
    when installing Teensyduino and if not using the windows explorer to locate destination Arduino, it will always locate the first one found and install in top of it.
    If you use a desktop...
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    Not a big deal: To speed up recording and...

    Not a big deal:
    To speed up recording and simplify procedures, extend wav header to 512 bytes by inserting a new chunk with real info or dummy data.
    before closing file, estimate file size etc,...
  6. @KurtE As you noticed, there is no standard...

    @KurtE
    As you noticed, there is no standard implementation of the MTP initiator. Even different Linux implementations seem to behave differently.
    MTP only defines the transport protocol and not the...
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    What I do with my I2S system is to start I2S ...

    What I do with my I2S system is to start I2S (set the enable bits) programmatically.
    This means you should comment the line in audio object and call it directly from sketch.
    the two lines of...
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    That seems to be a little bit complex. I will try...

    That seems to be a little bit complex. I will try to understand it.
    But,
    if you have not done yet, you could (I would)
    - use a low frequency signal, say around 100 Hz
    - apply a FFT
    - select...
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    Thanks for reasoning. So far, I could not see an...

    Thanks for reasoning. So far, I could not see an obvious flaw.

    How did you measure the phase change of 26 degrees?
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    Not sure, if I understand that statement. should...

    Not sure, if I understand that statement. should you not relate the time delay to the frequency and not to the change in frequency, right?

    not clear if you measure phase shift or time delay.
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    Not sure I understand. offset to what? 32...

    Not sure I understand.
    offset to what? 32 samples is a lot.
    how did you determine offset?
  12. see edit in post#3

    see edit in post#3
  13. AFAIK, it is the sequence of connections that...

    AFAIK, it is the sequence of connections that defines the sequence of executions, not the sequence of object declarations.

    Edit: best to check always SW
    It seems MarkT is correct and the sequence...
  14. A general point There is no reset button on...

    A general point
    There is no reset button on Teensy, but a program button that, indeed, removes Teensy from serial port and places Teensy into HID mode for programming.
    This is independent from...
  15. most people read all categories (new posts shows...

    most people read all categories (new posts shows all categories). I would not worry
  16. Replies
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    check https://www.pjrc.com/store/teensy41.html...

    check https://www.pjrc.com/store/teensy41.html (bottom)
    From your text it seems to be a 0.22uF decoupling capacitor (C21)
  17. Replies
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    I see now, I have to get a TP4056 myself

    I see now,
    I have to get a TP4056 myself
  18. Replies
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    @frohr what is the purpose of the VUSB...

    @frohr
    what is the purpose of the VUSB connection? it only goes to usb.
  19. Replies
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    I would not use 2 different I2S devices, but use...

    I would not use 2 different I2S devices, but use the two ADC in parallel with 1 I2S device (I2S1 has 4 data lines)
    MCLK, BCLK, LRCLK do in parallel to both ADC
    data lines are kept separate (on T4.x...
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    Why not turning the issue around? configure your...

    Why not turning the issue around?
    configure your CMake setup such that it is Arduino compatible.
    That is what I do with my makefile setup (using VSCode)
  21. You can use usb-audio and other audio objects...

    You can use usb-audio and other audio objects without an audio board.
    you only should have a true audio input/output object in the setup.
    e.g
    AudioOutputI2S i2s1;
    even if you do not...
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    please give the "mtp.disk serial" mode including...

    please give the "mtp.disk serial" mode including a recognized PID value a serious consideration.
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    @defragster ever tried to run T4.x with reduced...

    @defragster
    ever tried to run T4.x with reduced (12 Mbit/s) USB speed?
    IMHO, Teensy USB stack may not be most robust implementation.

    edit: uncommenting

    USB1_PORTSC1 |= USB_PORTSC1_PFSC; //...
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    without changes, the Teensy audio system is...

    without changes, the Teensy audio system is working with 44.1 kHz and not 48 kHz sampling
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    yes, this is one option

    yes, this is one option
  26. Replies
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    Simply adding a I2S without any connection will...

    Simply adding a I2S without any connection will keep the audio system running.
    USB input/output is not capable of doing so. USB is a special case, as it interacts with PC following special rules....
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    maybe...

    maybe
    https://forum.pjrc.com/threads/41504-Teensy-3-x-multithreading-library-first-release?highlight=multithread
    could help
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    Simon, the driving parameter is the block size...

    Simon,
    the driving parameter is the block size 128 that is defined in cores 'AudioStream.h'.
    There is also the common sampling frequency defined.
    While you could change sampling frequency here...
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    short answer sampling rate is always 44.1 kHz...

    short answer
    sampling rate is always 44.1 kHz
    the record/play queues are connected to individual channels and store blocks of 128 samples
    i.e. for stereo data you need 2 queue objects.
    how data...
  30. Replies
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    MTP on Teensy is a responder, if there is no PC...

    MTP on Teensy is a responder, if there is no PC attached, or if PC is not interrogating, there should be no activity.
    Also, while you acquire data, best is not to call mtpd.loop().
  31. sufficient power supply on remote teensy to...

    sufficient power supply on remote teensy to maintain 5V for boot process?
    my guess, when in boot mode, teensy resets itself due to temporary power failure.
  32. Thread: Bat detector

    by WMXZ
    Replies
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    161,182

    at least the latest TD supports exFAT, which...

    at least the latest TD supports exFAT, which happens to be also faster than FAT32
  33. what is bad about requiring the implementation of...

    what is bad about requiring the implementation of all virtual functions?
  34. that is my understanding

    that is my understanding
  35. Paul, I was referring to...

    Paul,
    I was referring to https://forum.pjrc.com/threads/48563-Cheap-ICS-52000-Microphone-Array-Board-for-TDM-evaluation?p=171455&viewfull=1#post171455
    I just listened again to his mp3 file and it...
  36. @feima0011 IMO, invensense is the wrong...

    @feima0011
    IMO, invensense is the wrong addressee. I understand it was demonstrated in other thread that multiple ICS52000 do work. It is the NotWired board that is not working properly.
    this board...
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    Should the trace not be covered by the green...

    Should the trace not be covered by the green soldermask?
  38. Replies
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    looking into the timing diagram, I would simply...

    looking into the timing diagram, I would simply try to use the stock Audio library I2S module.
    Only one channel will get data.
    Adjusting sampling frequency and clock timings for final application...
  39. Replies
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    Yes the connections are the one I'm using. Not...

    Yes the connections are the one I'm using.
    Not sure is stock I2S works, as it is tuned to codecs (setup is defined in output)
    Anyhow,
    key is to configure sync as short as possible
    eg for a mono...
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    I know it reads so, but I used a lot of similar...

    I know it reads so, but I used a lot of similar ADC's with I2S port (in PCM mode) for years now
  41. Replies
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    You misunderstood the ADC this is not for SPI...

    You misunderstood the ADC
    this is not for SPI but you should I2S port
    connect
    clk to Teensy clk
    dout to Teensy Din
    cnvst to Teensy FS
    din to DV+
  42. Replies
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    In case you are interested user KurtE has a MTP...

    In case you are interested user KurtE has a MTP Host WIP on https://github.com/KurtE/USBHost_t36/tree/MTP_Device
    As said it is WIP but may be useful as starting point
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    Noted and no objections Edit: as the Teensy...

    Noted and no objections

    Edit: as the Teensy loader has all information (serial number and program name), I will see if I can modify cli loader to log the information (date, time, program, teensy...
  44. Replies
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    Well, I guess one has not to use encryption. To...

    Well, I guess one has not to use encryption.
    To summarize,
    at the moment, there is no way to know which program is on Teensy. (e.g. one that has been programmed 2 years ago)
    in future, when...
  45. Replies
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    Could the Loader obtain the the Teensy Serial...

    Could the Loader obtain the the Teensy Serial number and log to file together with date so, together with @defragster suggestion, one can get a log of which teensy got which key?
  46. @frostylaughlin, listening for puffins? from...

    @frostylaughlin,
    listening for puffins?
    from the programming point of view, you can use also 24 or 48 MHz. The PLL is then always 96 MHz, so I'm not sure to reduce much the current.
  47. Replies
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    AFAIK, these are macros defined in some include...

    AFAIK, these are macros defined in some include files for debugging for easy redirection of debugging info.
    (different people have different programming styles)
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    AFAIK, Line-in and MIC cannot be used...

    AFAIK, Line-in and MIC cannot be used simultaneously
  49. Thread: AudioOutputI2SOct

    by WMXZ
    Replies
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    906

    Have a look at...

    Have a look at
    https://forum.pjrc.com/threads/58896-kxmx_kaugummi-A-CS42448-Breakout-Board

    Paul has some PCB on OSH Park https://oshpark.com/profiles/PaulStoffregen

    and...
  50. Thread: AudioOutputI2SOct

    by WMXZ
    Replies
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    906

    would be easier with 8channel DAC board

    would be easier with 8channel DAC board
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