Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: WMXZ

Page 1 of 10 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    2
    Views
    31

    The easiest way is to connect the uSD adapter to...

    The easiest way is to connect the uSD adapter to the same pins of T4.0 that are used by Audioboard Rev D. and uncomment lines that are labelled for audioboard.
  2. Replies
    32
    Views
    2,572

    It uses native SDIO driver of T3.5/6, T4.0 (no...

    It uses native SDIO driver of T3.5/6, T4.0 (no SPI or bitbanging)
  3. I may be wrong, but if you increase the number of...

    I may be wrong, but if you increase the number of turns and reduce the capacitor, you may transform your antenna more into a magnetic receiver that is less sensitive to electric noise.
    Any trials...
  4. @Paul, is T4.1 on track, or significantly...

    @Paul,
    is T4.1 on track, or significantly delayed?
    I see some uploads on cores, so I assume you are doing some testing.
    Do you have any feelings on how robust (mechanically) the T4.1 is? You...
  5. I know FLASHMEM keeps code in flash, but do that...

    I know FLASHMEM keeps code in flash, but do that for all libraries...
  6. Replies
    186
    Views
    32,581

    Looked into the T3.6 version of the MTP. in...

    Looked into the T3.6 version of the MTP.
    in fact, copy PC to Teensy3.6 is incomplete.
    Existing files are deleted, file info is transferred and file is created, but file content is not send and...
  7. Reading the last entries, I was wondering if one...

    Reading the last entries, I was wondering if one could not modify the linker/startup to behave as with T3.6, that is to copy to RAM only variables and Fastrun.
    For me memory is MUCH more important...
  8. Replies
    186
    Views
    32,581

    I will see if I can upload a hex file for one of...

    I will see if I can upload a hex file for one of the examples (T3.6 with SDIO)
  9. I'm pretty sure on that :-) Sorry. CMSIS rfft...

    I'm pretty sure on that :-) Sorry.
    CMSIS rfft implementation complies to standard usage.
    e.g. a 1024 data vector is treated as a 512 point complex vector, and a 512 point complex FFT is executed....
  10. May I put forward a slightly different...

    May I put forward a slightly different interpretation. If one has only real valued samples, then rfft is always the better choice. You can do the FFT roughly 2 times faster and you only get the...
  11. Replies
    145
    Views
    36,448

    without checking sparkfun instructions (and...

    without checking sparkfun instructions (and without having it done myself) I would assume

    on audio board1,
    connect straight:
    MCLK A.23 to T4.23
    BCLK A.21 to T4.21
    LRCK A.20 to T4.20
    SDA A.18...
  12. Replies
    186
    Views
    32,581

    copying files from PC to Teensy worked for me,...

    copying files from PC to Teensy worked for me, showing correct size. Have you enabled long names on SdFat?

    concerning MacOS, it simply may e a problem with Apple. Not sure if Apple still supports...
  13. Replies
    145
    Views
    36,448

    Sorry, your pictures are exactly as you tested...

    Sorry, your pictures are exactly as you tested them, i.e. there is ONLY 1 wire between 2nd audio shield and Teensy?

    Obviously ALL wires that from Teensy go to Audioboard 1 should also go to...
  14. Replies
    16
    Views
    235

    Are "Prasanna Kumar S" and "prsu001" the same...

    Are "Prasanna Kumar S" and "prsu001" the same person?
  15. Replies
    186
    Views
    32,581

    I have no access to a Mac, so I'm not very...

    I have no access to a Mac, so I'm not very helpful on this.
  16. Replies
    20
    Views
    332

    yes the audiocard uses 44.1 kHz, but I would...

    yes the audiocard uses 44.1 kHz, but I would nobody prohibits to add your own custom modules. However YMMV.

    In principle you could do: find and decode all FT8 signals in passband. (I guess...
  17. Replies
    20
    Views
    332

    Also, FT8 uses only 8 frequencies, so you may...

    Also, FT8 uses only 8 frequencies, so you may consider 8 DFT's with proper designed window length and variable base frequency.
  18. Replies
    8
    Views
    197

    So, if you plan to put Teensy into a...

    So, if you plan to put Teensy into a difficult-to-open enclosure, ensure that the two lines (reset and programming) are broken out together with USB. (on t3.2 'reset' is a pad on bottom)
    This way...
  19. Custom USB build option for Teensy Arduino IDE

    For some advanced or special use of Teensy it may be interesting to have custom USB stacks (e.g. one or two USB devices, MSC device etc)
    With Teensy3 it is possible to use No USB. Not sure what...
  20. Replies
    20
    Views
    332

    at which frequency? How many tones? there are...

    at which frequency?
    How many tones?
    there are different signal processing options that allow you to do that.
  21. Replies
    32
    Views
    444

    For the PCM1802, the relevant text is I...

    For the PCM1802, the relevant text is

    I understand you hate this info, but the figures are only examples, in case you wanted to use 48BCK, but 64 bit is easier both for device driver and DMA.
  22. Replies
    32
    Views
    444

    So, you read the manual and therefore you saw...

    So, you read the manual and therefore you saw this


    while one can easily write a device driver to have 48 BCK/frame for limited MCLK (needs only to read another manual and learn how to do DMA),...
  23. Replies
    1
    Views
    54

    MTP responder us now updated to allow for Teensy...

    MTP responder us now updated to allow for Teensy 3.6 the use of USBHS (2nd USB port on T3.6) as MTP-responder.

    There are two examples
    - mtp-test that used primary usb port for MTP Responder, as...
  24. Replies
    12
    Views
    275

    I decided, instead of full-blown multithreading,...

    I decided, instead of full-blown multithreading, to exploit the Arm multi-priority interrupt system.
    As my sensor systems lead to a data driven interrupt based processing chain, a lot of work is...
  25. you can mount audioboard below or above Teensy....

    you can mount audioboard below or above Teensy.
    Only thing to pay attention to is that the pin-labels Gnd 0,1..12, etc correspond exactly. That is why they are printed on the pcbs

    I myself prefer...
  26. Replies
    31
    Views
    2,324

    I plan to use the same Opamp, but have not tested...

    I plan to use the same Opamp, but have not tested them yet. I`m only concerned about the 18 MHz Gain-Bandwidth product that limits the achievable gain somewhat. But for a Pre-amp it may be OK.
  27. Replies
    25
    Views
    546

    Only to be sure, you are using a Teensy 3.2,...

    Only to be sure, you are using a Teensy 3.2, right?
    The AudioCard Rev C does not work with Teensy4.0 as wired.
  28. Replies
    7
    Views
    152

    Very interesting figures. Im indeed interested...

    Very interesting figures.
    Im indeed interested in minimizing the impact of uSD write on overall power stability to control power stability of downstream ADC.
    What I mean, proper dimensioned...
  29. Duplicate thread

    Duplicate thread
  30. Replies
    7
    Views
    152

    Maybe it is simply that the frequent sync() are...

    Maybe it is simply that the frequent sync() are too short to be measurable for time constant of an integrating mA meter?
    IMO,
    definitely frequent sync() is required to avoid uSD blocking when uSD...
  31. Replies
    1
    Views
    54

    MTP responder on Teensy USB2

    After, porting MTP responder to Teensy 4.0, I needed it to port it to USBHS of Teensy3.6.
    So Teensy3.6 could now have MTP responder on slow primary USB or on USBHS (used for USBHost).

    As I work...
  32. what is this "CUT" in picture 1090725 ?

    what is this "CUT" in picture 1090725 ?
  33. All depends on your ambitions. But there are...

    All depends on your ambitions.

    But there are really only three parameters to consider

    bandwidth: do you need audio or also ultrasonics or even infrasonics?
    sensitivity: the higher the better...
  34. Replies
    3
    Views
    121

    -6dB or half the voltage.

    -6dB or half the voltage.
  35. Replies
    53
    Views
    2,248

    As long as it is NOT done in HW but only in SW....

    As long as it is NOT done in HW but only in SW.
    I really look forward to a Dual processor architecture and I have a need for it and it does not need to be symmetric.
  36. Replies
    186
    Views
    32,581

    @nectar You did not give us the information we...

    @nectar
    You did not give us the information we need to help you.

    can you check if uSD is FAT32, or EXFAT?
    No Linux FS or NTFS is supported.
    where do you have your uSD Card?
    if build-in uSD...
  37. Replies
    4
    Views
    99

    The canonical way is to download programs via USB.

    The canonical way is to download programs via USB.
  38. If you wanted to have USB-Audio in your system,...

    If you wanted to have USB-Audio in your system, then You may have to wait until Paul finds time to implement it on T4.0 (It seems to require different implementation than done for Teensy3)
  39. Not sure if Teensy integration into Matlab is...

    Not sure if Teensy integration into Matlab is already so smooth and robust to follow that road now. But as you have Simulink model working, maybe it is a worthwhile exercise to see if it can be...
  40. you have to select Teensy4.0 your error message...

    you have to select Teensy4.0
    your error message indicates that you compile for standard Arduino and not Teensy
  41. Replies
    186
    Views
    32,581

    Updated GitHub https://github.com/WMXZ-EU/MTP_t4...

    Updated GitHub https://github.com/WMXZ-EU/MTP_t4 so that mounting/enabling MTP device on PC resets the object list.
    This allows to refresh the MTP disk content by unmount/mount (Linux) or...
  42. Replies
    26
    Views
    422

    That is the nice thing on Teensy, nearly...

    That is the nice thing on Teensy, nearly everything is possible.
    e.g.: you can easily write an audio object that controls the update rate, or modify the sampling rate of I2S chips.
    The question...
  43. Replies
    3
    Views
    114

    From Reference (figure23 and 25) you can see that...

    From Reference (figure23 and 25) you can see that for PCM1802 FSYNC controls the start of data transmission (data are only send when FSYNC is high) Consider it some sort of chip-select. You can use...
  44. Replies
    26
    Views
    422

    OK, Im with you concerning using the...

    OK, Im with you concerning using the accelerometer as acoustic Sensor (in fact it is an old concept: keyword vector-sensor)

    Assume you tell the LIS3DH to sample at 5.376 kHz then you should...
  45. Replies
    186
    Views
    32,581

    I tried today SW as is on Ubuntu with Nautilus...

    I tried today SW as is on Ubuntu with Nautilus and no other "mtp" installation and standard udev rules.
    No problems occurred. So I may not be of further help.

    I confirm, however, that on T4...
  46. As long you are not using Tympan, I would simply...

    As long you are not using Tympan, I would simply delete the src directory.
    BTW are you using Arduino IDE or makefile based compilation?

    Edit: sometimes forcing recompilation helps (change...
  47. Yes, the AudioStream way of handling data is... a...

    Yes, the AudioStream way of handling data is... a little bit restrictive...
    I ended up to use my own version "mAudioStream" only to have integer32 or even float data or keeping multiplexed data,...
  48. Replies
    186
    Views
    32,581

    I updated GitHub to include also new files for...

    I updated GitHub to include also new files for Teensy3 and boards.txt.
    I have it working on T4.0 and T3.6
    As soon as Paul decides what to do (using Seremu, Serial, or both with proper product-id)...
  49. Thread: piezo cable

    by WMXZ
    Replies
    8
    Views
    186

    All piezos generate only little voltage. You need...

    All piezos generate only little voltage. You need always a very good pre-amplifier (very low noise and very high input impedance). In past design was special FET followed by bipolar opamp.
    The...
  50. Replies
    186
    Views
    32,581

    The "???" is from the original code and send by...

    The "???" is from the original code and send by Teensy. Not sure with what to replace. must read more on MTP document.
    Note what is not yet implemented is Date and Time (was also not in original...
Results 1 to 50 of 500
Page 1 of 10 1 2 3 4