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    I only used p#14 Paul code. As below: //...

    I only used p#14 Paul code. As below:



    // Create 6 different frequencies on the SD card pins
    // for easy testing whether all 6 signals are connected.

    void setup()
    {
    GPIO8_GDIR |= (0x3F...
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    Thank you @defragster, just what I needed. ...

    Thank you @defragster, just what I needed.

    Long story: I measured the frequency of all pins after uploading the test code and everything was alright:

    156Hz dat3
    312Hz dat2
    4994Hz cmd
    2497Hz...
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    After installing Teensyduino 1.56 the error...

    After installing Teensyduino 1.56 the error changed to:

    0X25,SD_CARD_ERROR_DMA (DMA transfer failed)

    I tried many things the whole day. Soldered again everything suspicious, but no success. I...
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    I'm using Teensyduino 1.55 maybe that's the...

    I'm using Teensyduino 1.55 maybe that's the problem.

    Is the CD pin relevant at all? In attachment the board inside. I opened all the traces (incl. CD), so the board became a dummy pin-to-pin...
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    Hi Paul, The adapter is a very common one,...

    Hi Paul,

    The adapter is a very common one, probably the most commonly sold and what I could find where I live. I cut all the circuitry to be left only with the SD socket contacts. Then I found out...
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    I tried a different 256GB card and the error now...

    I tried a different 256GB card and the error now is SD_CARD_ERROR_CMD2 = 0x2,0x0 (SDIO read CID). Means it cannot even read the card ID I guess.

    I'll try soldering VDD and GND directly to the...
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    This morning I made the cables shorter (ca. 2cm)...

    This morning I made the cables shorter (ca. 2cm) but still not working. Is it possible to trace the problem with the error code?

    SD errorCode: SD_CARD_ERROR_ACMD41 = 0x17
    SD errorData = 0x0
    ...
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    T4 SDIO SD Card "initialization failed!"

    I modified a SPI SD card adapter to work as SDIO, soldered to the back pins on the T4.

    I cut the connections between some of the pins of the SD adapter, so now each pad goes exclusively to each...
  9. Improve SD write Speed Audio Board (23LC1024)

    I'm attempting to record WAV audio with a Teensy 4 with Audio Board D (SGL5000).

    Can the writing speed of the SD port incorporated in the Audio Board be improved, if I solder a 23LC1024 RAM? I...
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    Thank you for your time MarkT. Initially I...

    Thank you for your time MarkT.

    Initially I made a connection mistake, assuming that the secondary I2S port would work out of the shelf with any I2S board in Master mode. Then I realised that about...
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    ADC WM8782 on T4.1 MCLK problem

    Hi there,

    I'm trying to make work a Cirrus WM8782 based ADC board, which comes with its own clock. When plugged via secondary I2S_2 in Master mode it doesn't work, only a pattern noise comes out...
  12. Teensy 3.6 I2S (DAC + ADC boards possible?)

    Hello,

    I have a Teensy 3.6 and would like to use the I2S pins to plug two separate ADC and a DAC boards simultaneously. I know there is only one I2s port available in the T3.6. But, since my ADC...
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    I appreciate your feedback Mcu32. I ordered a...

    I appreciate your feedback Mcu32. I ordered a T3.6 so I can join the discussions around it. Hopefully things will go better with it and an alternative ADC board.

    Here I leave a recording I made...
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    Thank you for the code! When compiling I get...

    Thank you for the code!

    When compiling I get an error related to the SD.h library.

    I'm in the Teensy 4.0 here. It doesn't have SD card socket but I've read that it is possible to solder one to...
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    I installed the WavePlayer library but cannot...

    I installed the WavePlayer library but cannot find any code that records in the Examples.
    What do you mean with T4 socket? :/ The T4 is soldered to the audioboard.
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    BTW. This noise doesn't exist when listening in...

    BTW. This noise doesn't exist when listening in realtime through the headphone jack of the audio board, so it seems to be introduced during the waveform writing process.
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    Thank you for your answer. Are you sure that...

    Thank you for your answer.

    Are you sure that Frank B's waveplayer also records? As far as I can see it only plays (https://github.com/FrankBoesing/Teensy-WavePlayer).

    With a better SD card I...
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    Audio recording with Teensy 4

    I know this is common question but I'm trying to record stereo audio on the Teensy 4 w/Audio board and couldn't find a code that suits the task.

    The Record.ino example that Paul designed works...
  19. I only looked at the line-in specs so far, -...

    I only looked at the line-in specs so far, - SGTL5000 85 dB SNR (-60 dB input), compared to -102 dB in the AKM apparently. Did not test this in real world situation to see if the diff is relevant to...
  20. Very good observation on the preamp circuit you...

    Very good observation on the preamp circuit you bring, MarkT! I had already all parts collected and was ready to start building it, supposing that it would bring the signal to line-level :s I guess...
  21. Oy! I meant I2S :o Thanks for your replies! ...

    Oy! I meant I2S :o

    Thanks for your replies!

    My source will be a couple of transistor based mic preamps plugged to a pair of electret mics. As seen here: https://sound-au.com/project93.htm
    I...
  22. Analog-to-Digital converter IS2 - 48000Hz?

    I'm planning to get a fairly decent ADC board for recording sound with the Teensy 4.0. This is the model I'm looking at:
    ...
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    Thanks a lot maestro. Respects to your work.

    Thanks a lot maestro. Respects to your work.
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    TDA1387 I2S DAC in Teensy 4?

    I own a very basic but good sounding TDA1387 I2S DAC. It currently works with DATA, BCLK and FSCLK wired to a Combo384 Amanero USB module.

    ref.: https://www.teradak.com/products/107.html

    Would...
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