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    Can you explain that in more detail? You can't...

    Can you explain that in more detail?
    You can't use Teensy like a hub, if that's your plan.
    How does the Teensy know that it should connect it's usb host port to the usb device port? You'll need to...
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    that's pretty OK :)

    that's pretty OK :)
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    Yes and we confirmed that python is the reason.

    Yes and we confirmed that python is the reason.
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    Hm. Not that sure anymore. Is it faster by...

    Hm. Not that sure anymore. Is it faster by calculating with float instead double? (again, the /100.0) is superfluent anyway - the PC can do that much better.
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    Assuming max 500 , it's two bytes unsigned...

    Assuming max 500 , it's two bytes unsigned integer.

    Against "3.13crlf" = 6 bytes.

    So it saves 66%


    Edit: You could save even more by using the upper bits which are always zero

    2 seconds...
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    If two decimal places are really sufficient, i'd...

    If two decimal places are really sufficient, i'd just multiply the data by 100 and save 30000 bytes this way(no ".") ... also, print uses cr+lf..replacing this by "," saves another 30000 chars :)...
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    Sorry, that question was to the OP. I'd...

    Sorry, that question was to the OP.

    I'd probably just write a short C program that captures the data to a file.
    That's way faster than python. He could just read the file in python, then.
    Or...
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    Under windows?

    Under windows?
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    Yes, often "APE" is used for aac. It stores the...

    Yes, often "APE" is used for aac. It stores the information at the end of the file, like ID3v1. However, when I played with this, many y4ears ago, I had some aac files with ID3 Tags.



    So, it's...
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    I guess ffmpeg can do this.

    I guess ffmpeg can do this.
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    Hm. 64 commits behind master, readme says " ...

    Hm. 64 commits behind master, readme says "


    Last commit (2016) mentiones Teensy LC (partial support)



    int WatchdogKinetisKseries::sleep(int maxPeriodMS)

    {
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    I'd perhaps add a #warning "AVR Watchdog does not...

    I'd perhaps add a #warning "AVR Watchdog does not work"... or better delete that file... as it is, it is a) confusing, b) leads to the wrong assumption "hey,wdt is there and will work", and c) wrong.
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    ? What are you talking about... Builtin LED...

    ? What are you talking about...

    Builtin LED is on pin 13.
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    Note, better would be #define...

    Note, better would be


    #define wdt_enable(timeout) do{}while(0)
    etc... which at least does not lead to syntax errors (but still does nothing)
  15. No need to get frustrated... how about just...

    No need to get frustrated... how about just trying the example from the audio lib?
    Maybe it's a missing "sgtl5000_1.inputSelect()" line?
    Just to rule issues like this out, you should use known to...
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    Looks like the WDT "lib" is a fake: ...

    Looks like the WDT "lib" is a fake:



    #define wdt_reset()
    #define wdt_enable(timeout)
    #define wdt_disable()


    No Idea why... an errormessage would be better instead of saying "yes, it...
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    The Teensy has several real serial ports...

    The Teensy has several real serial ports (hardware), in addition the virtual one which is for USB.
    What kind of codec do you mean? For Audio?
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    I also don't see any real advantage of ID3V2.4...

    I also don't see any real advantage of ID3V2.4
    It adds another encoding (who needs that? UTF16 can handle everything), and unneeded stuff (unsync).


    ID3 is also used for *.aac.
    M4A is...
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    #include #define SDCARD_CS_PIN ...

    #include <SD.h>
    #define SDCARD_CS_PIN BUILTIN_SDCARD




    SdFat sd;
    SdFile dir;
    File file;
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    Looks like "syncsafe integers" are used in...

    Looks like "syncsafe integers" are used in ID3V2.4 only - not in ID3V2.3

    https://id3.org/id3v2.3.0

    Hm.

    Easy fix:
    replace the calls to id3_unsyncsafe() by __builtin_bswap32()
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    Looks like it's something with embedded pictures...

    Looks like it's something with embedded pictures - or more exact, with "unsync".
    Have to look closer....
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    How many pins?

    How many pins?
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    What is this "dial switch" ? How is it...

    What is this "dial switch" ?
    How is it connected?
    Please post photos.
    Or better something like a datasheet.

    You just can't read three different digital states with one digital pin.

    Also, it...
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    #include #define SDCARD_CS_PIN ...

    #include <SD.h>
    #define SDCARD_CS_PIN BUILTIN_SDCARD


    SdFat sd;
    SdFile dir;
    File file;


    #include "SPI.h"
  25. You can also take a look here:...

    You can also take a look here: https://github.com/FrankBoesing/Teensy-WavePlayer
    It can play many files at the same time (tested with 14 with a very fast card), and has basic looping.
    Recording is...
  26. To be sure i'd make a more "real world" test, and...

    To be sure i'd make a more "real world" test, and test exactly your usage-szenario.

    read 8 files + write one.
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    Maybe the encoding is UTF16.. I'll take a look...

    Maybe the encoding is UTF16..
    I'll take a look tonight, or tomorrow.
  28. Maybe @KurtE, @MJS513 or @Defragster can answer...

    Maybe @KurtE, @MJS513 or @Defragster can answer that.
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    Btw, the Arduino-IDE uses UTF-8 as far i know. ...

    Btw, the Arduino-IDE uses UTF-8 as far i know.

    https://stackoverflow.com/questions/4059775/convert-iso-8859-1-strings-to-utf-8-in-c-c
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    "Teensy 4.1 USB Host as MIDI device?...

    "Teensy 4.1 USB Host as MIDI device?"

    No. A host can't be a device.



    You can connect x devices to one host (by using a hub)
    You can't connect two hosts.
    You can't connect two devices.
  31. @wwatson, oh my... I can feel with you.

    @wwatson, oh my... I can feel with you.
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    You can replace the log* functions with a...

    You can replace the log* functions with a Serial.printf() or Serial.println...
    And for the first steps, to get it running, you can comment-out the switch.
    ID3 supports different string encodings....
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    yup, looks like I wrote that for ID3v3 :)...

    yup, looks like I wrote that for ID3v3 :)
    However, it's still simple.
  34. There is also an example "SdCardTest" which might...

    There is also an example "SdCardTest" which might be useful. You can extend it to 8 files + record.

    27276
  35. Bottlenecks are: - random access (happens...

    Bottlenecks are:
    - random access (happens whenever you read data from an other file) re-adressing is slow.
    - writing
    If you write a specialized program that does only this, perhaps without the...
  36. eh, no. Not even in a ideal world :) You have to...

    eh, no. Not even in a ideal world :)
    You have to add the time to switch between the files (re-adressing - that's SLOW!), the time the card needs to do it's internal wear-magic, the time to handle...
  37. You don't have to deal with wear - the card does...

    You don't have to deal with wear - the card does this - it has a builtin cpu.
    I don't think it's possible to read 8 channels and write 2 simultanously. Not without a really large buffer.
    However,...
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    Not sure.. *g*... i think it works with v2 only....

    Not sure.. *g*... i think it works with v2 only. Have not tested v1 (have no files with v1)

    I think v1 is not needed anymore.. it's outdated for many many years now.

    (Edit: The comment is...
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    Here's a snippet from a larger project I wrote: ...

    Here's a snippet from a larger project I wrote:



    // https://id3.org/id3v2.4.0-structure

    typedef struct
    {
    char id[3]; //"ID3"
    uint8_t version[2]; //04 00 Version 4
  40. @sicco - two options: - copy the existing...

    @sicco -

    two options:

    - copy the existing isr code
    - use interrupt chaining.

    with both: keep care of the interrupt priorities.

    And note that the core disables interrupts, sometimes....
  41. Why this tone? Just write your isr, if you feel...

    Why this tone?
    Just write your isr, if you feel you need it.

    have fun,
    Frank

    period. :)
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    I2C is incredible slow compared to I2S. And if...

    I2C is incredible slow compared to I2S. And if the adresses conflict, you have find a way around it...
  43. More or less, yes. But why would this be...

    More or less, yes.
    But why would this be important? What is the usecase?
    Normally, an interrupt line is used for such things - if timing is important.

    Edit: And remember that the serial...
  44. ...and how fast or slow the used bus is :) I...

    ...and how fast or slow the used bus is :)

    I remember accessing the RTC registers is really incredible slow..

    Thank you for the link, luni.
  45. Probably better if you read the manuals about the...

    Probably better if you read the manuals about the cpu core, its memory interfaces, busses and other docs.
    And visit the nxp forum.
    Imagine a periphal connected via a slower bus - the cpu continues...
  46. No they work. As said, it has to do with the cpu...

    No they work.
    As said, it has to do with the cpu pipelines.
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    What is a Teensy 4.2? Oh sorry, am reading on a...

    What is a Teensy 4.2?
    Oh sorry, am reading on a smartphone

    I guess you meant the Teensy 3.2
  48. Yes. In this case (end of isr) it's even better....

    Yes. In this case (end of isr) it's even better. ::memory tells gcc to move outstanding writes before the "dsb"
  49. Yes. And the "DSB" here makes sure, that the...

    Yes. And the "DSB" here makes sure, that the write-pipeline gets written before the ISR is left.
  50. the "asm volatile ()" ./ asm () is an...

    the "asm volatile ()" ./ asm () is an interesting topic, too.
    Often the "volatile" is just added without thinking... but it prevents optimization which can - in some cases - be useful. of course...
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