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  1. 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
  4. 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...
  5. 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...
  6. sdio-uSD socket (sensu T3.6)?

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

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

    by WMXZ
    Replies
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    36,418

    Passive Acoustic Monitoring (PAM) on underwater...

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

    by WMXZ
    Replies
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    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...
  10. Sorry Chip, did you find meanwhile the...

    Sorry Chip, did you find meanwhile the attachInterrupt line?
  11. @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...
  12. Thread: Bat detector

    by WMXZ
    Replies
    527
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    36,418

    mind to explain why?

    mind to explain why?
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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...
  15. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    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...
  19. 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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    Bill, great to get SD_FAT with exFAT and SDIO...

    Bill,
    great to get SD_FAT with exFAT and SDIO for T4.0
    BTW, what is your suggestion for your SdFs library, are you planning to upgrade to T4.0?

    One thing I would be curious about is the power...
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    My basic wish list for T4.1 - added uSD card -...

    My basic wish list for T4.1
    - added uSD card
    - pins for USB1 (device)
    - pins for USB2 (with host protection)
    - LDO to allow 6- 16 V Vin
    - access to 1 MB of RAM (build in or external)
    - NO...
  22. would not call it very low power, but I could run...

    would not call it very low power, but I could run it from Teensy 3.3V (CSAC SA.45s from Symmetricon http://www.prc68.com/I/pdf/Symmetricom%27s_SA.45s_CSAC_updates.pdf)
    on the 30 C limit: it is not...
  23. How I di it, is to ignore the drift of the RTC,...

    How I di it, is to ignore the drift of the RTC, and CPU

    My files are all 1 minute long (closing driven by RTC seconds)
    every header contains the RTC but also millis and micros.
    Further I sample...
  24. You have to use the definitions from...

    You have to use the definitions from cores/teensy3/kinetis.h
    not definitions by non-teensy users
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    AFAIk, in the compiler commands are all options...

    AFAIk, in the compiler commands are all options -O3 for example
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    maybe have a check with actual compiler and...

    maybe have a check with actual compiler and linker options (verbose mode)
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    I'm happy to report a typo "locatoins" below the...

    I'm happy to report a typo "locatoins" below the signals table.
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    As you see from JBeale example, direct access to...

    As you see from JBeale example, direct access to analog ports is part of the Teensy core, so always implemented with ALL Teensies that have build-in ADC
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    UPS, I thought it is a T4.0. For a T3.2 6-7 V are...

    UPS, I thought it is a T4.0. For a T3.2 6-7 V are OK. Only T4.0 is limited.
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    Vin only accepts 3.6 to 5.5 V (there is NO...

    Vin only accepts 3.6 to 5.5 V (there is NO additional LDO as with previous Teensies (3.2 - 3.6)
    So connecting 2S LIPO (on controller) is calling for problems (distruction?). Add external dc/dc...
  31. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    BTW concerning integrated active HP and...

    BTW
    concerning integrated active HP and amplification, I found this
    https://hackaday.io/project/8353-worlds-smallest-bat-detector
  32. Thread: Bat detector

    by WMXZ
    Replies
    527
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    36,418

    I know, the datasheet of the SGTL5000 is only...

    I know, the datasheet of the SGTL5000 is only inviting not to use it.
    The first thing I did was to test id there is a Sigma Delta or not. By sweeping over Nyquist, it seems that there is a sigma...
  33. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    correct. All sigma/delta ADC datasheets show a RC...

    correct. All sigma/delta ADC datasheets show a RC LP filter at in input, the values of which are tricky to be estimated. So, always best to follow the datasheet.
    As example see...
  34. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    Does it not depend on type of filter? Active...

    Does it not depend on type of filter?
    Active filter, absolutely yes, the must be avoided, but they could be constructed with gain, right?

    But there is space for passive filtering, reducing the...
  35. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    @aethertek did you say a picture is worth a...

    @aethertek
    did you say a picture is worth a thousand words?
    would you mind to draw your schematic suggested in #495?
  36. Thread: Bat detector

    by WMXZ
    Replies
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    36,418

    I concur with all you said. Unfortunately, the...

    I concur with all you said.
    Unfortunately, the SGTL5000 audioboard costs really nothing, compared to a genuine ultrasonic ADC board with proper signal conditioning.
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    Well, I use the same SAI for doing both (sending...

    Well, I use the same SAI for doing both (sending MCLK out and using L/R and BCLK as slave)
    here is a snippet of the code for a T3.6


    void i2s_rx_slave_setup(void)
    {
    SIM_SCGC6 |=...
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    I have the feeling, we have here some semantic...

    I have the feeling, we have here some semantic issues.
    I2S/SAI has 4 lines, say for RX or TX

    -MCLK (master clock)
    -BCLK (Bit clock)
    -L/R (left/right) clock, or Framesync
    -data

    we have two...
  39. You cannot easily use audioshield AND them I2S...

    You cannot easily use audioshield AND them I2S MEMS you are referring too. Both are using I2S.
    (I say easily, because in principle it is possible, as T3.2 has two I2S data ports, and if you control...
  40. Thread: Bat detector

    by WMXZ
    Replies
    527
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    36,418

    Cor, as you are playing with SGTL5000, In case...

    Cor, as you are playing with SGTL5000,
    In case you missed it, you may be interested in
    https://forum.pjrc.com/threads/52798-Overclocking-SGTL5000?p=181609&viewfull=1#post181609
    Walter
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    I would doubt that, Teensy is registered by PJRC...

    I would doubt that, Teensy is registered by PJRC and if PJRC blows fuses, then IMO a Teensy 4.0 would need fuses blown. at most it Teensy 4.0 alike.
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    concerning CAP for uSD, Yes, writing to uSD...

    concerning CAP for uSD,
    Yes, writing to uSD needs significant mA for a short period of time and internal ADC could be effected.
    A 2nd version of the uSD breakout board, could feature a own 3.3V...
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    I have to look into that!

    I have to look into that!
  44. Sufficient for me

    Sufficient for me
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    another valid option.

    another valid option.
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    Paul's T4 breakout blog says but it seems this...

    Paul's T4 breakout blog says

    but it seems this was not your question.
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    that is what I was looking for. A longer...

    that is what I was looking for.
    A longer version with the uSD Card would be great.
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    updated the Github Repo

    updated the Github Repo
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    It would indeed be great to have a breakout board...

    It would indeed be great to have a breakout board with ONLY a uSD cardholder.
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    Would be happy to include that, but which version...

    Would be happy to include that, but which version are you using? in my uSDFS/examples/logger_RawWrite is no #include <USBHost_t36.h>
    Maybe I had it in the beginning, but now it is not there.
    Could...
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