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  1. Replies
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    I would override it and copy also existing yield...

    I would override it and copy also existing yield functionality (backward compatibility)
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    I vaguely recall, that millis() is not based on...

    I vaguely recall, that millis() is not based on periodic interrupt. In fact, for my loggers I had to remove wfi from loop() do ensure sufficient loop circles for disk writes.
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    thanks for link, but I'm not sure if that answers...

    thanks for link, but I'm not sure if that answers my question on the particular example you presented in #9.
    I read the example in that post that the compiler can change the sequence of operations...
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    Can you, please, give us a reference, that...

    Can you, please, give us a reference, that compiler can change the scope of a variable from local to higher levels? (moving "uint8_t data" from inside to outside the "{…}")
  5. No, your SDcard should be fine fine. Q: how did...

    No, your SDcard should be fine fine.
    Q: how did you solder " SD port directly on the T4"?
  6. How do you go to sleep? AFAIK, wake-up from...

    How do you go to sleep?
    AFAIK, wake-up from deep sleep is reset MCU
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    AFAIK, the erase is controlled by the Bootloader...

    AFAIK, the erase is controlled by the Bootloader chip. If erase phase is interrupted, I guess, it can be repeated as often as one wishes (TBC by Paul)
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    It may be only an issue of the example you are...

    It may be only an issue of the example you are using.
    I use SdFat_beta recording 1.2 MByte/s continuously
    Trick is: have ADC run at priority level,use all memory for buffer and write at loop level...
  9. Christian Drosten is Head of Virology of the...

    Christian Drosten is Head of Virology of the Charité (not overall boss) and mostly concerned with research
    Nevertheless, good Podcast (at least for German speaking audience)
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    But only if you wanted to mount directly. Using...

    But only if you wanted to mount directly.
    Using RevB and 100 Ohm in MCLK line should work.
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    The adapter is capable of both protocols and...

    The adapter is capable of both protocols and SdFat uses SPI library, so you have to configure SPI library first before initiating SdFat.
    You are using T4 and I'm not sure if there is a SPI overlaid...
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    That is a question on the implementation of the...

    That is a question on the implementation of the filesystem and independent of physical devices.
    asynchronous access to is easy for write access, but for read access you may need blocking, except OS...
  13. uninstall ALL serial and ALL HID ports that are...

    uninstall ALL serial and ALL HID ports that are not active to get rid of screwed-up ports. (obviously with Teensy disconnected)
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    Your I2S MEMS is connected wrong for T4.0. It...

    Your I2S MEMS is connected wrong for T4.0.
    It seems you used the suggested pins for T3, that are different to T4

    From T4 pin card I deduce

    LRCLK to Pin 20
    BCLK to Pin21
    DOUT to Pin8
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    AFAIK, these two requirement contradict each...

    AFAIK, these two requirement contradict each other (from a technical stand point of view)
    You cannot inhibit upload to user and reserve rights to yourself. For TD there is no difference between you...
  16. FAT32 or exFAT?

    FAT32 or exFAT?
  17. what type of microSD format do you use?

    what type of microSD format do you use?
  18. Serial.begin is empty! re FAQ: Forget about...

    Serial.begin is empty!

    re FAQ: Forget about it:
    "https://www.pjrc.com/" does not even shows T4.0, so FAQ, WIKI etc is behind the moon, which is easier to reach
  19. The usual problem: Teensy is too fast to see...

    The usual problem:
    Teensy is too fast to see Serial.println("Test"); of monitor
    insert while(!Serial);
    before Serial.begin(9600);
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    Now modulate 120 MHz with 11.5 MHz. Also not...

    Now modulate 120 MHz with 11.5 MHz.
    Also not sure if there is a IF (typically 10.7 MHz in double conversion radios) also in digital radios.
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    Sorry, only to understand: Do you mean you plug...

    Sorry, only to understand: Do you mean you plug in usb cable from PC AND provided power from HP production mode (whatever that is)?
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    I guess the patch cable act as antenna radiation...

    I guess the patch cable act as antenna radiation some MHz clocks, that may interfere with DAB antenna frontend (most likely an active antenna).
    (I have no idea on SPDIF clock rate, but is the effect...
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    shielding?

    shielding?
  24. Replies
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    Corrrect. Audio library data-driven updates need...

    Corrrect. Audio library data-driven updates need at least 1 'real' data input or output object. It has not to be connected to other objects, but it must be running. Typical case where this is...
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    Is that not the complete (implicit?)...

    Is that not the complete (implicit?) implementation of the constructor (using {,} )?
  26. If my C++ knowledge is correct, the statement...

    If my C++ knowledge is correct, the statement defines both audio_block_t (via typedef) and audio_block_struct {} (via struct).
  27. That was I had in mind.

    That was I had in mind.
  28. Yes, I mean 'copy anyway button' for selected...

    Yes, I mean 'copy anyway button' for selected libraries including "sketchdirectory/libraries" and cores
    I'm aiming at minimal workspace containing all source code I need to compile the program.
  29. I could find it interesting to create a complete...

    I could find it interesting to create a complete standalone development system (not only core, but also all the libraries) so there are no multiple dependency issues.
  30. in case someone wants to compile ino fies with...

    in case someone wants to compile ino fies with makefile, here is my added rule to a VisualTeensy derived makefile


    USR_INO_FILES := $(call rwildcard,$(USR_SRC)/,*.ino)
    USR_OBJ +=...
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    The first time around out1 and out2 are NULL, so...

    The first time around out1 and out2 are NULL, so code applyGainThenAdd could crash.
    As out1 and out2 are local, program will never work
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    That is why most of my programs use empty ino...

    That is why most of my programs use empty ino files and have all code in cpp file. Arduino does not interfere with cpp files. And I use makefiles.
    HOWEVER, before asking on this forum for help, or...
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    Since you are insisting: 1) Arduino pre-compiler...

    Since you are insisting:
    1) Arduino pre-compiler does not mind if you use standard C++
    2) Apart from pre-compiler, standard C++ compilers are used to generate execitable
    3) You can put all your...
  34. OK, Then try simple example on teensy to check...

    OK, Then try simple example on teensy to check connections.
  35. Pictures are from Teensy3.6, not T4.0 Also...

    Pictures are from Teensy3.6, not T4.0
    Also cannot see if Audioboard gets 3.3V
  36. Replies
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    there is no Arduino1.8.13 supported (could be a...

    there is no Arduino1.8.13 supported (could be a typo?) Install 1.8.12
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    If you do not believe Paul's answer, why will you...

    If you do not believe Paul's answer, why will you believe other's?
    We only can confirm what Paul has stated.
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    1) you cannot tamper with Teensy bootloader it is...

    1) you cannot tamper with Teensy bootloader it is in own chip.
    2) you can easily port what ever you want to Teensy, you only have to comply with Teensy burned-in basic configuration (about which I...
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    "This 9-bit flicker randomly" is only valid for...

    "This 9-bit flicker randomly" is only valid for broadband analysis. For all narrowband signals, this argument does not hold. There is a good reason why noise is specified as spectral density, i.e. re...
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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...
  43. Frank, you are welcome to change the GitHub...

    Frank,
    you are welcome to change the GitHub repository.
    Walter
  44. 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...
  46. @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)
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