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Type: Posts; User: Frank B

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  1. It would be default, if it was that good. But it...

    It would be default, if it was that good.
    But it isn't.
    Programs which work perfectly now, can behave different.
    It influences all existing Software (and if it is optimization only), and I can't...
  2. Hm, I don't think so. The overflow does not...

    Hm, I don't think so. The overflow does not influence the loop, and with optimization the whole "foo" should be optimized away - overflow or not.
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    ...you can do the same with Arduino by modifiying...

    ...you can do the same with Arduino by modifiying the boards.txt file.
  4. It happens on a Teensy LC, too (Cortex-M0+) , and...

    It happens on a Teensy LC, too (Cortex-M0+) , and still with GCC 9

    Seems to a serious bug somewhere in GCC, when optimizing..
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    If there is a driver for the SGTL5000 chip,...

    If there is a driver for the SGTL5000 chip, chances are good that the Audio shield works with the ESP.

    The Audio lib will not work - it uses the Arm Cortex DSP features, NXP chip timers, and needs...
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    Not that a Problem as it Sounds. Normally,...

    Not that a Problem as it Sounds.
    Normally, interrrupts are most likeley in the cache. The Chance that a regulär called interrupt is not in the cache is very very small.
    So.. best case is - as...
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    Yes, if you can buy them. At least in their...

    Yes, if you can buy them.
    At least in their EBAY-Shop is no 3253 /SOIC available. And wasn't when I ordered them last year. I suspect they have SOIC in their datasheet but are not producing them?
    ...
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    To use the full range of the ADCs and prevent...

    To use the full range of the ADCs and prevent clipping on the other hand. The INAs are low noise.
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    I still think it possible on the 3.2 - were just...

    I still think it possible on the 3.2 - were just doing it wrong. :)
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    Not Sure. It did not work for me, too-and Paul...

    Not Sure. It did not work for me, too-and Paul said it's not implemented o the T4 so I lost interest and will look again when it is ported to the T4
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    I'm planning my new board-rev. Let me modify my...

    I'm planning my new board-rev.
    Let me modify my question:
    A digital pot like AD5252 (1K) has 256 steps. 1k/256 = ~4 Ohm per step (+ 74Ohm wiper) - i could not use all steps, but, enough.
    Do you...
  12. ...a static spi-ram has more space and may be...

    ...a static spi-ram has more space and may be even easier to use..

    But i'd just a T3x anyway.
  13. The 3x and 4x have some bytes Battery backed up...

    The 3x and 4x have some bytes Battery backed up RAM.
    Or use external static ram with battery backup.
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    Thank you. :) WH7U, DD4WH: Do you think it...

    Thank you. :)



    WH7U, DD4WH: Do you think it is possible to use analog switches to switch the gain resitors (Rg) on the INA163 ? Four, or even two steps, controllable by the Teensy would be...
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    The main circuitry is very similar to that used...

    The main circuitry is very similar to that used in the SDR-1000.

    These are empty solder pads, which are actually intended for filters.
    But I chose the wrong size, the filters probably cannot be...
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    Got my own board working... it collected dust for...

    Got my own board working... it collected dust for some month.
    I had the Elektor-Board so far. Oh my.. what a difference! Did'nt know how much better a front-end can be :)
    (I'm new to this stuff)
    ...
  17. - If you're not using the latest core version...

    - If you're not using the latest core version (after 1.52), the Eventresponder gets called - in Systick _and_ yield(). It disables the Interrupts globally.
    - USB disables the interrupts globally.
    ...
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    Ok, maybe Nyquist plays no role here... I/Q are...

    Ok, maybe Nyquist plays no role here... I/Q are not signals as usual.
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    But we are sampling WFM with 256kHz, so maximum...

    But we are sampling WFM with 256kHz, so maximum we can get is 128kHz BW (Nyquist-Shannon). Am I thinking wrong?
  20. Tim, yes, the intervaltimer issue is known since...

    Tim, yes, the intervaltimer issue is known since the early 4.0 betas. There is no known way to fix it.
  21. These gaps are due to other interrupts running....

    These gaps are due to other interrupts running.
    1) the systick,
    2) usb disables the global interrupt flag.

    And, if your core-codebase is not the newest - yield and the EventResponder are...
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    Why do you connect a LED to a input? Anyway, as...

    Why do you connect a LED to a input?
    Anyway, as you said, you can cut the connection.
  23. It continues to completion.

    It continues to completion.
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    There is no MEMS on the audio shield. Pin 6...

    There is no MEMS on the audio shield.
    Pin 6 controls the chipselect of the optional memory chip.

    Best is, for this kind of questions, to look at the schematic:...
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    It is always the highest possible speed....

    It is always the highest possible speed. Independent of any settings anywhere. They are all ignored. On any Teensy 3.x or 4.x.
    Of course, the 4.x is much faster than the 3.x
    That's why I suggestest...
  26. https://www.exp-tech.de/plattformen/teensy/9947/ps...

    https://www.exp-tech.de/plattformen/teensy/9947/psram-chip-for-teensy-4.1

    Last time I looked, the PSRams were sold already. Stock=0
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    The USB Baudrate setting is a empty function. It...

    The USB Baudrate setting is a empty function. It just does nothing.F_CPU is the current speed.
    You can expect issues from Overclocking.
    That's why it is OVERclocking.
  28. I've never used it without hub. The problem is...

    I've never used it without hub.
    The problem is most likely your ancient Windows, Eddie
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    https://github.com/PaulStoffregen/Audio/pull/347

    https://github.com/PaulStoffregen/Audio/pull/347
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    Tried to use a slow USB Hub(12MB/s) ? Upgrading...

    Tried to use a slow USB Hub(12MB/s) ?
    Upgrading from Win7 might be an option, too.
  31. Yes, two channels USB, no, there are no plans for...

    Yes, two channels USB, no, there are no plans for more channels.
    Good news: It's open source, so you can add the missing code
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    As said, a resistor would do it. If you don't...

    As said, a resistor would do it.
    If you don't want it: Take a look at the startup hooks, in startup.c, esp. the early hook.

    Teensy delays the booting, because PCs are not quick enough to detect...
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    You may want to add a resource "Teensy Model" -...

    You may want to add a resource "Teensy Model" - some things do not work on T3 and vice versa.
    But this needs a global setting - a radio or checkbox or ..

    Edit:
    Code attached. Open the...
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    So, adding pt8211, i2s1, spdif1, adat1, mqs1...

    So,

    adding pt8211, i2s1, spdif1, adat1, mqs1

    will conflict here:



    Conflict: spdif1 setting['SPDIF Protocol'] and i2s1 setting['I2S Master']
    Conflict: shareable 'OUT1A Pin' spdif1 and...
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    Paul, I'm gonna go have a look. But it's gonna...

    Paul, I'm gonna go have a look.
    But it's gonna take time because I'm busy with moving arrangements and I have to renovate.


    I don't know what happens where in this huge code, and I have to get...
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    Like the wrong abs and round its just a poor...

    Like the wrong abs and round its just a poor implementation by the Arduino devs.
    Best not to use it.

    I tend to #undef abs and #undef round to get rid of this buggy crap . The similar functions...
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    I tend to use something like this #define...

    I tend to use something like this


    #define HOT FASTRUN __attribute__((hot))
    #define COLD FLASHMEM __attribute__((cold))


    and then write
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    Here are additional linker-scripts and a modified...

    Here are additional linker-scripts and a modified boards.txt.

    When they are installed (overwrite the existing boards.txt) , you can chose to use the old "Teensy 3" behaviour.
    Programs will runs...
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    ok, quite possible that I'm wrong. Too much...

    ok, quite possible that I'm wrong.
    Too much details of the different models to remember...
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    @audeophilic - yes you asked this before. You...

    @audeophilic - yes you asked this before.
    You simply can't change the voltage reference on the T4/T41, if I remember correctly.
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    @Paul: It would involve creating a pin - or...

    @Paul: It would involve creating a pin - or device array, setting the element to "true" if in use and before inserting the object it would be neccessary to check that flag.
    From the description...
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    Hi Paul, yes. But it is not of much use. ...

    Hi Paul, yes.
    But it is not of much use.

    20257

    I've added some minor changes:
    1) All in- and outputs which use the same device - for example all which use I2S1 - have the same color. This...
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    @ pjkdeveloper...

    @ pjkdeveloper

    Sure you use the correct import settings?
    16 Bit.
  44. @Paul, can you fix this, please?

    @Paul, can you fix this, please?
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    Yes, most instructions on the T4 require only one...

    Yes, most instructions on the T4 require only one cycle. Two of them can be executed simultaneously (->0.5)
    The next teensy has a second CPU... ...so we subtract one cycle, and we have -0.5.
    That...
  46. Just write pinMode(10, OUTPUT)

    Just write pinMode(10, OUTPUT)
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    Oh, I've seen the Serial Monitor printing its own...

    Oh, I've seen the Serial Monitor printing its own sourcecode, on windows, so ...
    These are the first signs of the coming improbability drive on Teensy 5. For sure.

    Make sure you have your towel...
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    "Extreme" - what will be the next (i.mx.rt 1070) ...

    "Extreme" - what will be the next (i.mx.rt 1070)
    Improbability Drive?


    https://www.youtube.com/watch?v=bVLk9-YpRi0

    ...it will be fun :)

    Don't panic.
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    FM: The Elektor SDR works. With Stations > 100MHZ...

    FM: The Elektor SDR works. With Stations > 100MHZ not good, stations around 87..95MHZ are better.
    It does not work with weak stations .
    I can't receive the local station, but a station100km away,...
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    Feel free to change whatever you want (and do a...

    Feel free to change whatever you want (and do a Pullrequest)
    From the beginning on, the code was meant as a starting point only, not a complete reday to use application.

    I will be not here for...
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