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    There is no justification for such rule. The use...

    There is no justification for such rule. The use of audio memory is deterministic and can easily be calculated. Of course, you need to look into the audio library and do the maths. The rule FrankB...
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    Please give the actual version of MTP_t4 a try...

    Please give the actual version of MTP_t4 a try (both T3.6 and T4-0)

    I reworked the code from a working version, so implementation is somewhat different.
    I also removed the T3.6 USB2 component,...
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    MTP responder deserves some cores decisions and...

    MTP responder deserves some cores decisions and modifications
    - MTP Disk + Serial for T3.x and T4 (needs own PID and Boot capability and usc_desc modifications)
    - MTP needs decision if...
  4. Frank, you are welcome to change the GitHub...

    Frank,
    you are welcome to change the GitHub repository.
    Walter
  5. All the audio library depends on...

    All the audio library depends on cores/AudioStream.cpp and the audio library. IMHO, you can only change scope of connections, if you understand how it is working now. I assume you are fluent in C++...
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    Maybe you will end up with the realization, that...

    Maybe you will end up with the realization, that Paul's cores is pretty much baremetal (OK, with all the #if defined, it is more MULTI-MCU baremetal).
    BTW, I tried it, but realized it is not worth...
  7. @DD4WH, Yes, I experienced it also. The...

    @DD4WH, Yes, I experienced it also. The conversion of sec to day is some sort of a mess. Maybe it is correct after 29thFeb? As it created problems everywhere, I tend to convert it back to TD-TimeLib...
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    mis interpreted your op, sorry.

    mis interpreted your op, sorry.
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    sure there is SW interrupt (SWI) trigger. The...

    sure there is SW interrupt (SWI) trigger. The audio library works that way.
    you can use any irq with

    NVIC_ENABLE_IRQ(irq);
    and trigger with

    NVIC_CLEAR_PENDING(irq); NVIC_SET_PRIORITY(irq,...
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    The easiest way is to connect the uSD adapter to...

    The easiest way is to connect the uSD adapter to the same pins of T4.0 that are used by Audioboard Rev D. and uncomment lines that are labelled for audioboard.
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    It uses native SDIO driver of T3.5/6, T4.0 (no...

    It uses native SDIO driver of T3.5/6, T4.0 (no SPI or bitbanging)
  12. I may be wrong, but if you increase the number of...

    I may be wrong, but if you increase the number of turns and reduce the capacitor, you may transform your antenna more into a magnetic receiver that is less sensitive to electric noise.
    Any trials...
  13. @Paul, is T4.1 on track, or significantly...

    @Paul,
    is T4.1 on track, or significantly delayed?
    I see some uploads on cores, so I assume you are doing some testing.
    Do you have any feelings on how robust (mechanically) the T4.1 is? You...
  14. I know FLASHMEM keeps code in flash, but do that...

    I know FLASHMEM keeps code in flash, but do that for all libraries...
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    Looked into the T3.6 version of the MTP. in...

    Looked into the T3.6 version of the MTP.
    in fact, copy PC to Teensy3.6 is incomplete.
    Existing files are deleted, file info is transferred and file is created, but file content is not send and...
  16. Reading the last entries, I was wondering if one...

    Reading the last entries, I was wondering if one could not modify the linker/startup to behave as with T3.6, that is to copy to RAM only variables and Fastrun.
    For me memory is MUCH more important...
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    I will see if I can upload a hex file for one of...

    I will see if I can upload a hex file for one of the examples (T3.6 with SDIO)
  18. I'm pretty sure on that :-) Sorry. CMSIS rfft...

    I'm pretty sure on that :-) Sorry.
    CMSIS rfft implementation complies to standard usage.
    e.g. a 1024 data vector is treated as a 512 point complex vector, and a 512 point complex FFT is executed....
  19. May I put forward a slightly different...

    May I put forward a slightly different interpretation. If one has only real valued samples, then rfft is always the better choice. You can do the FFT roughly 2 times faster and you only get the...
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    without checking sparkfun instructions (and...

    without checking sparkfun instructions (and without having it done myself) I would assume

    on audio board1,
    connect straight:
    MCLK A.23 to T4.23
    BCLK A.21 to T4.21
    LRCK A.20 to T4.20
    SDA A.18...
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    copying files from PC to Teensy worked for me,...

    copying files from PC to Teensy worked for me, showing correct size. Have you enabled long names on SdFat?

    concerning MacOS, it simply may e a problem with Apple. Not sure if Apple still supports...
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    Sorry, your pictures are exactly as you tested...

    Sorry, your pictures are exactly as you tested them, i.e. there is ONLY 1 wire between 2nd audio shield and Teensy?

    Obviously ALL wires that from Teensy go to Audioboard 1 should also go to...
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    Are "Prasanna Kumar S" and "prsu001" the same...

    Are "Prasanna Kumar S" and "prsu001" the same person?
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    I have no access to a Mac, so I'm not very...

    I have no access to a Mac, so I'm not very helpful on this.
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    yes the audiocard uses 44.1 kHz, but I would...

    yes the audiocard uses 44.1 kHz, but I would nobody prohibits to add your own custom modules. However YMMV.

    In principle you could do: find and decode all FT8 signals in passband. (I guess...
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    Also, FT8 uses only 8 frequencies, so you may...

    Also, FT8 uses only 8 frequencies, so you may consider 8 DFT's with proper designed window length and variable base frequency.
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    So, if you plan to put Teensy into a...

    So, if you plan to put Teensy into a difficult-to-open enclosure, ensure that the two lines (reset and programming) are broken out together with USB. (on t3.2 'reset' is a pad on bottom)
    This way...
  28. Custom USB build option for Teensy Arduino IDE

    For some advanced or special use of Teensy it may be interesting to have custom USB stacks (e.g. one or two USB devices, MSC device etc)
    With Teensy3 it is possible to use No USB. Not sure what...
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    at which frequency? How many tones? there are...

    at which frequency?
    How many tones?
    there are different signal processing options that allow you to do that.
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    For the PCM1802, the relevant text is I...

    For the PCM1802, the relevant text is

    I understand you hate this info, but the figures are only examples, in case you wanted to use 48BCK, but 64 bit is easier both for device driver and DMA.
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    So, you read the manual and therefore you saw...

    So, you read the manual and therefore you saw this


    while one can easily write a device driver to have 48 BCK/frame for limited MCLK (needs only to read another manual and learn how to do DMA),...
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    MTP responder us now updated to allow for Teensy...

    MTP responder us now updated to allow for Teensy 3.6 the use of USBHS (2nd USB port on T3.6) as MTP-responder.

    There are two examples
    - mtp-test that used primary usb port for MTP Responder, as...
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    I decided, instead of full-blown multithreading,...

    I decided, instead of full-blown multithreading, to exploit the Arm multi-priority interrupt system.
    As my sensor systems lead to a data driven interrupt based processing chain, a lot of work is...
  34. you can mount audioboard below or above Teensy....

    you can mount audioboard below or above Teensy.
    Only thing to pay attention to is that the pin-labels Gnd 0,1..12, etc correspond exactly. That is why they are printed on the pcbs

    I myself prefer...
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    I plan to use the same Opamp, but have not tested...

    I plan to use the same Opamp, but have not tested them yet. I`m only concerned about the 18 MHz Gain-Bandwidth product that limits the achievable gain somewhat. But for a Pre-amp it may be OK.
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    Only to be sure, you are using a Teensy 3.2,...

    Only to be sure, you are using a Teensy 3.2, right?
    The AudioCard Rev C does not work with Teensy4.0 as wired.
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    Very interesting figures. Im indeed interested...

    Very interesting figures.
    Im indeed interested in minimizing the impact of uSD write on overall power stability to control power stability of downstream ADC.
    What I mean, proper dimensioned...
  38. Duplicate thread

    Duplicate thread
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    Maybe it is simply that the frequent sync() are...

    Maybe it is simply that the frequent sync() are too short to be measurable for time constant of an integrating mA meter?
    IMO,
    definitely frequent sync() is required to avoid uSD blocking when uSD...
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    MTP responder on Teensy USB2

    After, porting MTP responder to Teensy 4.0, I needed it to port it to USBHS of Teensy3.6.
    So Teensy3.6 could now have MTP responder on slow primary USB or on USBHS (used for USBHost).

    As I work...
  41. what is this "CUT" in picture 1090725 ?

    what is this "CUT" in picture 1090725 ?
  42. All depends on your ambitions. But there are...

    All depends on your ambitions.

    But there are really only three parameters to consider

    bandwidth: do you need audio or also ultrasonics or even infrasonics?
    sensitivity: the higher the better...
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    -6dB or half the voltage.

    -6dB or half the voltage.
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    As long as it is NOT done in HW but only in SW....

    As long as it is NOT done in HW but only in SW.
    I really look forward to a Dual processor architecture and I have a need for it and it does not need to be symmetric.
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    @nectar You did not give us the information we...

    @nectar
    You did not give us the information we need to help you.

    can you check if uSD is FAT32, or EXFAT?
    No Linux FS or NTFS is supported.
    where do you have your uSD Card?
    if build-in uSD...
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    The canonical way is to download programs via USB.

    The canonical way is to download programs via USB.
  47. If you wanted to have USB-Audio in your system,...

    If you wanted to have USB-Audio in your system, then You may have to wait until Paul finds time to implement it on T4.0 (It seems to require different implementation than done for Teensy3)
  48. Not sure if Teensy integration into Matlab is...

    Not sure if Teensy integration into Matlab is already so smooth and robust to follow that road now. But as you have Simulink model working, maybe it is a worthwhile exercise to see if it can be...
  49. you have to select Teensy4.0 your error message...

    you have to select Teensy4.0
    your error message indicates that you compile for standard Arduino and not Teensy
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    Updated GitHub https://github.com/WMXZ-EU/MTP_t4...

    Updated GitHub https://github.com/WMXZ-EU/MTP_t4 so that mounting/enabling MTP device on PC resets the object list.
    This allows to refresh the MTP disk content by unmount/mount (Linux) or...
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