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  1. Replies
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    Should express form not be backward compatible,...

    Should express form not be backward compatible, and therefore standard form would suffice, as long as MCU does not support express?
  2. AFAIK, there should be NO DMA that directly...

    AFAIK, there should be NO DMA that directly accesses audio-block data. If there are few objects that do that, maybe they should be rewritten. Could you give some examples, where audioblocks are used...
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    to change AUDIO_BLOCK_SAMPLES you have to change...

    to change AUDIO_BLOCK_SAMPLES you have to change it in the cores/Teensy3/AudioStreams.h file and recompile the whole system (changing some entry in Tools of Arduino IDE)
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    Chip, The original version of he MTP has serial...

    Chip,
    The original version of he MTP has serial and not seremu
    https://github.com/yoonghm/MTP/blob/master/usb_desc.h
    Not clear why Paul has chosen to use seremu.
    Also not clear (forgot) if and...
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    I'm using regularly 4 D cells for a Teensy 3.6....

    I'm using regularly 4 D cells for a Teensy 3.6. Should be similar for T3.2.
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    On T4, I would suggest to add a 3V coin cell and...

    On T4, I would suggest to add a 3V coin cell and not to rely on Vin for keeping RTC.
    E.g. T4 can switch off internal 3.3V and then you lost RTC.
    Coin cell will last sufficiently long to avoid...
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    There are multiple threads that use Teensy4 as is...

    There are multiple threads that use Teensy4 as is and make the carrier PCB with castellated connection to teensy. Through-holes are also easy connected.
    I plan t do similar for my boards.
    Note, you...
  8. Thanks for doing it. especially of interest to...

    Thanks for doing it.
    especially of interest to me, what is the procedure for continues DMA (say in case of I2S input DMA)? Does ISR needs to address caching (as done in Output_I2S) or not (as done...
  9. I have not looked into playing back on CS42448,...

    I have not looked into playing back on CS42448, but will do soon.
  10. Replies
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    Correction: Jetson Nano is a 4core ARM and 128GPU...

    Correction: Jetson Nano is a 4core ARM and 128GPU system.
    but you are right, AI is (again) very trendy.
    I would like to see some effort to use the GPU on the T4 for processing, if it can be...
  11. @jpaudio I updated /modified the...

    @jpaudio
    I updated /modified the https://github.com/WMXZ-EU/microSoundRecorder/tree/microSoundRecorder_dev branch of the microSoundRecorder to use and initialize CS42448
    (no playback yet)

    I...
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    As you are concerned with time-wasting and have...

    As you are concerned with time-wasting and have all equipment for production in house, maybe you could consider designing your own Teensy PCB (getting the bootloader chip from PJRC).
    Schematics and...
  13. where in the top did you declare waveform1? you...

    where in the top did you declare waveform1? you only declare wavetable1
  14. disconnect all devices open device manager...

    disconnect all devices
    open device manager
    activate show hidden devices
    uninstall COM6
    connect 3D printer
    connect Teensy
  15. Replies
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    It cannot be easier than with Teensy.exe. only...

    It cannot be easier than with Teensy.exe. only two buttons to click, and one file to select.
    (are you really saying, that you let someone update a MCU with a new firmware, who is not capable of...
  16. @jpaudio, As I do not have a CS42448 Audio...

    @jpaudio,
    As I do not have a CS42448 Audio board, I will try to look into the code only, and you have to do the testing for me.
    From your description, it means that there is some initialization...
  17. There is a misunderstanding, the...

    There is a misunderstanding, the "microSoundRecorder" does not allow playback. it only records to uSD.
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    You only need to distribute teensy.exe to upload...

    You only need to distribute teensy.exe to upload hex file.
    No Arduino or Teensyduino required
  19. Thread: Teensy 3.6 noise

    by WMXZ
    Replies
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    Typically a FET is used to transform impedance...

    Typically a FET is used to transform impedance from high to low.
  20. Only partially correct. when using MTP you get...

    Only partially correct. when using MTP you get Seremu which simulates Serial over HID. Using Arduino, you have same functionality as with Serial. On Linux, you simply can cat end echo to the HID...
  21. My interest is only to learn how I could use all...

    My interest is only to learn how I could use all the memory available. If I have to DMA or dynamic allocation or something else.
    The new picture seems to be what I was expecting.
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    Yes, you can do so. Only drawback is that...

    Yes, you can do so.
    Only drawback is that AudioBoard SD card is SPI based and 1mm pich based sdCard (as on T4 and T3.6) is SDIO based.
    AS SPI has only a 1 bit dataport and SDIO has 4 bit dataport...
  23. As you asked for special feature, you may have to...

    As you asked for special feature, you may have to write it yourself

    I assume you wanted code for T3.x and not T4
    So, I checked kinetis.h, the k66 manual and some other core samples and

    ...
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    Let me try Assume you are in a cathedral, and...

    Let me try
    Assume you are in a cathedral, and you transmit a loud but very short impulse (ideally 1 sample), then what you hear is a lot of reverberation, that is a lot of echoes that come back from...
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    To add to Paul's comment: I have a version where...

    To add to Paul's comment:
    I have a version where ADC is running as master and Teensy as slave, BUT Teensy provides the MCLK for the ADC (i.e. not using a Xtal).
    So Teensy outputs MCLK but as slave...
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    Michael, Assume you wanted same sampling...

    Michael,
    Assume you wanted same sampling frequency (LRCLK and BCLK)
    you connect LRCLK and BCLK to both devices, you connect MCLK to devices that need MCLK (assuming both devices use the same...
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    Solved?

    doubling the set_arm_clock command seems to work

    #if defined(__IMXRT1062__)
    extern "C" uint32_t set_arm_clock(uint32_t frequency);
    #endif

    void setup() {
    // put your setup code here, to run...
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    the following code #if defined(__IMXRT1062__)...

    the following code

    #if defined(__IMXRT1062__)
    extern "C" uint32_t set_arm_clock(uint32_t frequency);
    #endif

    extern volatile uint32_t systick_cycle_count;

    uint32_t m_micros(void)
    {
  29. is not PMIC_ON_REQ enabling the LDO?

    is not PMIC_ON_REQ enabling the LDO?
  30. If you succeed with routing, that would be a...

    If you succeed with routing, that would be a great solution. I'm with it.
  31. It may have compiled to Arduino and not Teensy...

    It may have compiled to Arduino and not Teensy libraries, that are in a different folder and take precedence in compiling and linking.
    In the post I referred to, you were saying you installed ONLY...
  32. Strange that this compiled correctly. The audio...

    Strange that this compiled correctly. The audio library needs other libraries (e.g. Wire to talk to the SGTL5000). Try to install with ALL TD libraries.
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    T4 , set_arm_clock and micros()?

    I get wrong values using micros() after changing CPU speed with set_arm_clock on a T4.

    #if defined(__IMXRT1062__)
    extern "C" uint32_t set_arm_clock(uint32_t frequency);
    #endif

    void setup() {...
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    priority levels? There are in steps of 16 (at...

    priority levels?
    There are in steps of 16 (at least for T3.6, not checked yet for T4)
    e.g levels 16 to 31 are the same level
  35. what happens if you use "AudioNoInterrupts" ONLY...

    what happens if you use "AudioNoInterrupts" ONLY in the beginning and AudioInterrupts at the end of frequencyUpdate ?
    IMO that is the only place where it matters (you stop and restart audio...
  36. Thread: T4 RTC wake-up

    by WMXZ
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    T4 RTC wake-up

    maybe I missed it.
    I can program the RTC alarm and shutdown the RTC, but I miss the link that tells the imxrt1062 to reboot on RTC alarm.
    So any advice that is more specific than decoding the...
  37. sdio-uSD socket (sensu T3.6)?

    sdio-uSD socket (sensu T3.6)?
  38. it is in initSDHC() (file sdio_teensi.cpp) in my...

    it is in initSDHC() (file sdio_teensi.cpp)
    in my file line 706
    Walter
  39. Thread: Bat detector

    by WMXZ
    Replies
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    38,909

    Passive Acoustic Monitoring (PAM) on underwater...

    Passive Acoustic Monitoring (PAM) on underwater glider (6-channel volumetric array)
  40. Thread: Bat detector

    by WMXZ
    Replies
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    38,909

    I see what you aiming for, reactance per se does...

    I see what you aiming for, reactance per se does not increase noise (it is imaginary and not real), but changes gain, so impact of real noise sources have a higher impact.
    Will have to play with...
  41. Sorry Chip, did you find meanwhile the...

    Sorry Chip, did you find meanwhile the attachInterrupt line?
  42. @jpaudio I'm on travel right now, but can look...

    @jpaudio
    I'm on travel right now, but can look into the problem beginning next Tuesday.
    mean while could you please be a little bit more specific?
    maybe you could post the config.h file and give...
  43. Thread: Bat detector

    by WMXZ
    Replies
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    38,909

    mind to explain why?

    mind to explain why?
  44. Replies
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    Adapted code to my T3.6 configuration to get it...

    Adapted code to my T3.6 configuration to get it running
    Cannot see your time jitter
    could you replace loop by

    void loop()
    {
    static uint32_t t0=0, t2=0, tx, ty;
    tx=micros(),
    ...
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    The solution to your puzzle seems to be: the...

    The solution to your puzzle seems to be:
    the time jitter, you are observing, is real and you do not loose data.

    Reason: you are starting/stopping recording based on recByteSaved, which in...
  46. Thread: Bat detector

    by WMXZ
    Replies
    531
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    38,909

    I would decrease the values of C1 and C5 from 1uF...

    I would decrease the values of C1 and C5 from 1uF to 10nF, as I suggested in #504. This would suppress low frequencies that for Bat frequencies are not at all of interest.
    Play with a spice program...
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    As I have slightly different requirements (I need...

    As I have slightly different requirements (I need some mounting holes and connector to Audio and storage board), I make my own breakout board.
    For this I plan to use the blackketter approach but...
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    @ianmb can you provide the complete ino file,...

    @ianmb
    can you provide the complete ino file, you are using?
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    does it compile on ArduinoIDE? if yes, then...

    does it compile on ArduinoIDE?
    if yes, then check the .cpp file created by AruinoIDE (found in temp directory, as seen using verbose)
    Most likely you are missing some include files or are not...
  50. I tend to agree that situation becomes very...

    I tend to agree that situation becomes very confusing.
    My suggestion for a clean way forward is that Teensyduino ONLY provides the core functionality and PJRC maintains only a list of links to...
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