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  1. Yes, that's why I did not use it. But i guess it...

    Yes, that's why I did not use it. But i guess it is OK for a lot of applications.
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    I found an other nice thing to work on :) and...

    I found an other nice thing to work on :) and will not work on these things here.

    So, whatever you do with USB or other things.. maybe we should try to find a better way, which would allows to...
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    SD cards can sometimes draw a lot of current....

    SD cards can sometimes draw a lot of current. Maybe look there? Depends on what else you have connected...
    I remember I had similar problems, a long time ago. It helped to solder a 100uF cap to the...
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    Ah, of course..you're using a Teensy with inbuilt...

    Ah, of course..you're using a Teensy with inbuilt slot. No, in this case it is not needed.
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    You should solder at least the needed pins (for...

    You should solder at least the needed pins (for the Audiochip and SD, GND and so on..)
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    Maybe a connection is not good. Are there any...

    Maybe a connection is not good.
    Are there any wires between the Audioshield and the Teensy, or are you using pinheaders?
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    Have you tried other cards?

    Have you tried other cards?
  8. @vindar, great lib. Thanks :)

    @vindar, great lib. Thanks :)
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    Perfect :)

    Perfect :)
  10. I wasn't aware of that Paul, otherwise I had...

    I wasn't aware of that Paul, otherwise I had contributed my code for that, which I wrote last year :)
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    I'm not very interested in the audio-delay...

    I'm not very interested in the audio-delay anymore, too.
    The samplerate-adjustment in the other thread is a bit more interesting, but personally I don't need it, and at the moment I don't know...
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    It is always fascinating what you can do with a...

    It is always fascinating what you can do with a cell phone and image editing on the PC.
    22671
    CY15B104Q1
    B 607936
    CYP 1707
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    My FRAMs are: CY15B104 , not sure about the more...

    My FRAMs are: CY15B104 , not sure about the more exact type, as I can't read the printed label.

    @Paul, would be great if you could add your FRAMs to the audio effect_delay_ext, too.
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    I must have some FRAMs, too. I can try to find...

    I must have some FRAMs, too. I can try to find them... since my move, its very hard to find things like these..lol
    Didn't i add them to the audio-delay? Hmm.... so must have minimum one...
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    @Paul, i've played a bit with it. There are no...

    @Paul, i've played a bit with it.
    There are no audible effect - at least I can hear none - if the steps are small.
    You *will* hear clicks, if you need to change one of the other variables: n2, or...
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    One more important thing: The Teensy 4 does not...

    One more important thing: The Teensy 4 does not tolerate 5 volts at the connections, even for a short time.
    Maybe you should use a Teensy 3.2 (->and the older "Rev B" audioshield!) , if you are not...
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    When you get the new Teensy and shield, first...

    When you get the new Teensy and shield, first solder the pin-headers, and load the "guitar" example from arduino.
    Connect a headphone to test if you can hear the guitar.
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    Best would be, to take a sheet of paper and to...

    Best would be, to take a sheet of paper and to draw a schematic. How it *should* be. Without looking at the actual wiring.
    Then, after that, check if your wiring follows your shematic.
    May post the...
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    Just let me ask again, if you're sure that it is...

    Just let me ask again, if you're sure that it is correct that there are black wires on "+" and red wires on "-" on the converter..?
    I can see only one photo.
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    As long as the temperature does not change too...

    As long as the temperature does not change too much..
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    @All: The famous clock-tree diagram indicates,...

    @All:
    The famous clock-tree diagram indicates, that it may be possible to use - in addition - the video-pll for audio.
    Maybe we can just toggle between both PLLs.
    This way, we could reach a...
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    ...with switching the PLL off/on it takes ~450...

    ...with switching the PLL off/on it takes ~450 microseconds to lock. I don't think it will lock much faster without off/on.
    ~450us can be quite some time.
    1 sample at 44100Hz takes 22.68us, ~20...
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    Yup, so it does play not a big role. There is no...

    Yup, so it does play not a big role. There is no reason not to use a high value, right? :)

    Interestingly, the time to lock is always the same...and very short - about ~50..55 (minus cycles for...
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    Just a wild guess.. maybe 1073739000 (0x3FFF...

    Just a wild guess.. maybe 1073739000 (0x3FFF F4F8) is a good value. It's a multiple of 24 and 1000, thus allows 0%error for all std frequencies and maybe the PLL can lock a little bit faster due to...
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    a little excel:

    a little excel:
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    There is no magic going on .. decimals are...

    There is no magic going on .. decimals are ignored :)
    They are just not needed here, because it was intended for std sampling-freqs.
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    I'd like to suggest to add a function...

    I'd like to suggest to add a function _setI2Sfreq(double or float freq) to utility/imxrt_hw.cpp.
    Then, we can remove all the calculations from all the I2S-using codes and just call the new...
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    Over the weekend, if I find some time, maybe.

    Over the weekend, if I find some time, maybe.
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    There are no audible artifacts? So let's use it...

    There are no audible artifacts?
    So let's use it for USBAudio :)
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    void setI2SFreq(int freq) { #if defined(T4) ...

    void setI2SFreq(int freq) {
    #if defined(T4)
    // PLL between 27*24 = 648MHz und 54*24=1296MHz
    int n1 = 4; //SAI prescaler 4 => (n1*n2) = multiple of 4
    int n2 = 1 + (24000000 * 27) / (freq *...
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    Would be interesting for USB-Audio..

    Would be interesting for USB-Audio..
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    No, - had no reason to try it :) Maybe...

    No, - had no reason to try it :)

    Maybe damo1976 can tell us wether it works or not, as he works on that anyway.
    I'd be interested to hear the result.
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    It *can* work, if you just don't send I2s over...

    It *can* work, if you just don't send I2s over the air.
    Maybe raw data. With sync signals added. Maybe WLAN. Or, best, bluetooth. Edit: something that is fast enough and involves error-correction....
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    He wants to add decimals != zero i.e....

    He wants to add decimals != zero
    i.e. 44100.3456789

    I don't how how that can help (Edit: Even if he changes the code not to use an int). Esp. with the temperature sesivitiy of crystals. two...
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    there must be some magic that restores the...

    there must be some magic that restores the decimals from an int value.. and can adjust the pll to exactly these deleted sub-hz..
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    I think its time to read the manual :)

    I think its time to read the manual :)
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    hm..ok..that means i have not idea- :confused:

    hm..ok..that means i have not idea-

    :confused:
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    @wmxz he refers to int fs =...

    @wmxz he refers to
    int fs = AUDIO_SAMPLE_RATE_EXACT;
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    Yes, it throws the decimals away. They are not...

    Yes, it throws the decimals away. They are not needed for the samplefrequency, normally.
    Other parts of the lib, however use it as float.

    How do you plan to transfer I2s ? you know its speed?...
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    Are the PSRAMS on all three boards you tested in...

    Are the PSRAMS on all three boards you tested in #425, Kurt?
    If not I might have an Idea..
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    As Paul said, the solution is to use one Teensy...

    As Paul said, the solution is to use one Teensy in slave mode. No "Air".
    Or transfer the analog signal. Or use SPDIF.
    Not sure about the role of the 2nd Teensy.. is its only role to convert I2S to...
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    The only big difference I can think of is the...

    The only big difference I can think of is the time needed for erasing.
    Does the program erase anything?

    The Teensy waits for the chip. Oh, and yes, maybe it waits when a block gets written (don't...
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    Shame on me - I see that I did not add a note who...

    Shame on me - I see that I did not add a note who wrote that code. The part with the calculation was not written by me.
    It was WMXZ, maybe... not sure.. :-( It must be somewhere in the long T4 beta...
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    For SPI, I used to connect wp and reset with vcc,...

    For SPI, I used to connect wp and reset with vcc, no pullups, direct connection. But maybe that's not needed. You say it works for you without that, so why not... :)
  45. voliviavv, what was you last...

    voliviavv, what was you last microcontroller-project?
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    The chips switch to QSPI via a software-command...

    The chips switch to QSPI via a software-command (register-write)
  47. OSH may have cheap shipping, but their boards are...

    OSH may have cheap shipping, but their boards are expensive.
    I have better overall-experience with china... and the shipping is even faster. Partly, because they need only 24/48hrs to produce boards...
  48. Thank you, BriComp.

    Thank you, BriComp.
  49. For Teensy 3.x /LC , it looks like this ...

    For Teensy 3.x /LC , it looks like this


    operator bool() { return usb_configuration && (usb_cdc_line_rtsdtr & USB_SERIAL_DTR) &&
    ((uint32_t)(systick_millis_count -...
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    https://www.pjrc.com/teensy/pins.html This...

    https://www.pjrc.com/teensy/pins.html

    This page is for Teensy 2 only, but there is no indication that it is not valid for Teensy 3/4 which leads to misunderstandings:...
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