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    Sticky: @Paul, I just noticed that you asked at the top...

    @Paul,
    I just noticed that you asked at the top of this thread for bugs/suggestions related to Teensyduino 1.47 to help with your next go around. I posted a couple of threads in "General...
  2. Yes - sorry.

    Yes - sorry.
  3. Resolved - see new thread

    Resolved - see new thread
  4. Compiling custom Audio Library compatible classes for Teensy 4

    In the thread F_CPU_ACTUAL error in Teensy 4 but not Teensy 3 the issue of being unable to compile code that included custom (home-grown) Audio Library classes for the T4 was introduced. I have...
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    Thanks, however there is nothing in my PM inbox...

    Thanks, however there is nothing in my PM inbox yet (5:15pm) - don't know how long it usually takes...:confused:
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    Hi Dan - I presume by "rigorous testing" you mean...

    Hi Dan - I presume by "rigorous testing" you mean a mechanical/assembly workout?? Count me in for any alpha/beta testing!

    FWIW - I would certainly vote for retaining access to the GPIO pins.
    ...
  7. A couple of more data points: 1. The audio...

    A couple of more data points:
    1. The audio passthrough example in the IDE Teeny4-->Audio-->HardwareTesting--> PassThroughStereo compiles without problem (it's almost the same as mine above!!!)
    2....
  8. Seems like it might be a problem for all...

    Seems like it might be a problem for all "home-brew" audio objects! I've tried several, here is the simplest example I can think of - a do-nothing pass-through object:

    ...
  9. I got the same error last night when attempting...

    I got the same error last night when attempting my first port:


    In file included from C:\Users\Derek\AppData\Local\Temp\arduino_build_495648\sketch\AudioSDR.h:31:0,
    from...
  10. Different versions of arm_math for T3 and T4 in Teesyduino...

    I've just started porting my software to T4. I make extensive use of arm_math, and in the past I've had to update arm_math.h to avoid using deprecated routines (which come with a warning that they...
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    Hey Daniel, You made my day when I saw this ...

    Hey Daniel, You made my day when I saw this thread! I have a very simple question - I'm sitting here trying see just where the fexible breakout fits into the grand scheme? I can't, for the...
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    Silly me!!! I just noticed TallDog's thread. ...

    Silly me!!! I just noticed TallDog's thread. I'll sure be ordering some of those - his T3.x boards have been great.
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    Breakout board for the T4?

    I'm looking forward to getting my T4's! However I will need access to the 10 extra GPIO pins on the bottom before I can do any serious work with it. Has anybody designed a breakout board at this...
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    Just in case you are not aware - many/most SI5351...

    Just in case you are not aware - many/most SI5351 (used in the Adafruit module) libraries provide a calibration function for the XTAL oscillator. You only need to calibrate at one frequency, ie...
  15. @KurtE :confused: What's the problem??? ...Just...

    @KurtE
    :confused: What's the problem??? ...Just use a uint9_t and you should be good to go :rolleyes::cool:
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    I've never done that on any of my projects. For...

    I've never done that on any of my projects. For example in my SDR project, here is the SGTL5000 initialization code

    AudioNoInterrupts();
    codec.inputSelect(AUDIO_INPUT_LINEIN);
    ...
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    ... and donj't forget you can set the line-in and...

    ... and donj't forget you can set the line-in and line_out gains by setting the voltage range on the SGTL5000 in 1.5 dB steps for example:

    codec.lineInLevel(15); // Set codec input...
  18. Has anybody tried Adafruit's 3.5" 320x480 -...

    Has anybody tried Adafruit's 3.5" 320x480 - HXD8357D (PRODUCT ID: 2050), or the version for their Feather boards? They're expensive ($40), but if they work I'd be prepared to give it a try......
  19. Hi guys, I'm looking to completely redesign my...

    Hi guys,
    I'm looking to completely redesign my half dozen or so Teensy prototyping systems (with the impending arrival of the T4) and these will include a new display. I've been trying to follow...
  20. That's great! I've been trying to think how to...

    That's great! I've been trying to think how to generate an accurate phase difference measurement. One idea I'm thinking about is to take the FFT of the two signals, compute the phase of each line...
  21. The files are uploaded to the forum in a zip...

    The files are uploaded to the forum in a zip file. At the bottom of the post there is a grey box. if you click on it, the zip should be automatically downloaded to your computer. On my computer...
  22. Files are uploaded...

    Hi Rob,
    I have uploaded the first-pass at the IQ generator for you. The zip folder contains five files:
    1) - The test sketch AudioIQgenerator.ino
    2) - The Audio object: AudioIQgenerator.h and...
  23. The Hilbert version is all done and working! ...

    The Hilbert version is all done and working! I'll be posting it either later this evening or tomorrow ;)
    The block execution time is 390 usecs with the 3 IIR filters active, and 190 usecs if they...
  24. Hi Rob, That's very interesting. I have...

    Hi Rob,
    That's very interesting. I have not tried a SSB modulator (because I gave up my ham license (ZL2ACF) at the age of 17 in 1960), although I've been thinking about about possibly taking...
  25. I'm not sure I understand. Are you saying you...

    I'm not sure I understand. Are you saying you want to produce an SSB signal at 2400 MHz? Is it a voice signal? The document I attached in the post above tells you haw to do this, but of course...
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    No I'm not, although I sure wish I was :( I'll...

    No I'm not, although I sure wish I was :( I'll be placing an order as soon as pre-orders are announced!

    While I'm waiting, has anybody looked at the T4 to see if the T3.6 "bug" - where the I2S...
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    @MichaelMeissner: I asked Daniel Gilbert...

    @MichaelMeissner: I asked Daniel Gilbert (TallDog on Tindie) about his plans for a T4 breakout board similar to his DIP-64 and Standard t3.6 breakouts on Tindie. Here's his response yesterday:
    ...
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    Hi Frank, I am not familiar with any "rule of...

    Hi Frank,
    I am not familiar with any "rule of thumb" regarding length of FFT buffers, and am not familiar with any Brogerding reference. (FWIW -I might just mention that I taught Signal...
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    Yes I'm doing overlap-and-add, and the zero...

    Yes I'm doing overlap-and-add, and the zero padding is for that very purpose. You are probably aware that when doing frequency domain convolution (via FFT) of two time functions of lengths P and Q...
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    I have never seen a reference to what happens...

    I have never seen a reference to what happens after a spectral rotation in the FFT of a zero padded data set. What happened was that when I tried it in hardware I noted a sign change in successive...
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    Paul - I'm delighted to report that your efforts...

    Paul -
    I'm delighted to report that your efforts and suggestions have been 100% successful (with the Teensy in Master mode)! After adding the 220R resistor to the MCLK line, and using your updated...
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    You are absolutely correct. My bad! Of course...

    You are absolutely correct. My bad! Of course you rotate the FFT data. Brain fart!
    I should say that because we are working on a length N data buffers in a zero padded length 2N FFT, there is a...
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    Frank - quick reply: 1) Yes - Hans Summer at QRP...

    Frank - quick reply:
    1) Yes - Hans Summer at QRP Labs was the inspiration for the SI5131 mod, but I couldn't find any published code at the time I wrote my own. I certainly confirm Hans'...
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    Hi people, I've just converted my SI5351 tuner...

    Hi people,

    I've just converted my SI5351 tuner clock to direct quadrature generation without need for a divide by 4 Johnson counter. The I and Q outputs are on CLK0 and CLK1. It generates a very...
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    Paul - Blackaddr and I found that the problem was...

    Paul - Blackaddr and I found that the problem was much, much worse when I2S input/output is running... Like you I was able to run Audio stuff - with a few errors - without I2S...

    The reason...
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    I've been working on this problem for the past...

    I've been working on this problem for the past few days. I bought a cheapo logic analyzer ($12 on Amazon) and it has been amazingly helpful in working out exactly what is going on!
    Here are my...
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    I thought we were out of the woods, but as I...

    I thought we were out of the woods, but as I hinted last night there are problems still with the added resistors when another device is added to the I2C bus!

    In my case when I added an Adafruit...
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    You are absolutely correct. Apologies to all -...

    You are absolutely correct. Apologies to all - I can't count...:D The Wire library data packets sent from the master (Teensy) were correct all along, and it was the codec's ACK/NACK bit that was...
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    Here's an application note about choosing the...

    Here's an application note about choosing the value of I2C pullup resistors [URL= http://www.ti.com/lit/an/slva689/slva689.pdf[/URL]. The higher the pull-up, the slower the risetime because of...
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    Fantastic! Adding the two 220R resistors on the...

    Fantastic! Adding the two 220R resistors on the SDA and SCL lines fixed the problem, and the WM8731 is now working on both the T3.6 and T3.2s without errors. It is working with the Audio library...
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    I'm off to add 220R resistors right now, more...

    I'm off to add 220R resistors right now, more later... Incidentally, I noticed the other day that the T3.6 worked for a few hours IF (and only IF) I had the 'scope probes connected to the SCL and...
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    But the little Wire sketch has no I2S... By the...

    But the little Wire sketch has no I2S... By the way I think you did a nice job with BALibrary. I will certainly use it when I get this issue resolved.
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    I2C problems with Teensy 3.6 and WM8731 codec

    For the past week or so I have been trying unsuccessfully to use a WM8731 codec with a T3.6. Others are having the same problem and it is actively being discussed in another thread. I have started...
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    I am about to post a new thread about the I2C...

    I am about to post a new thread about the I2C problem! I believe I might have gotten to the bottom of it, and if it is true, there is a bug in the Wire library! The WM8731 works very well with a...
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    Well, the good news is that I have the WM8731...

    Well, the good news is that I have the WM8731 chip working interfaced directly to the Teensy 3.6. It's working with BALibrary, but I still no have luck just with the Audio Lib WM8731 handler alone....
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    Hi everybody, I've been away from the forum for...

    Hi everybody,
    I've been away from the forum for many months for health reasons, and because I was unable to solve the audio board quadrature bug in which the two channels are randomly offset by a...
  47. Bob, I have continued to be plagued by this...

    Bob,
    I have continued to be plagued by this bug, and after a year of trying have still not found a true solution. It sure plays hell with my own SDR work, and in ultrasonic imaging work, where...
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    That's a great idea! I'm still having the...

    That's a great idea! I'm still having the problem and am struggling with having to solder the chips in suspended on 30AWG wire. Hardly an elegant robust solution. A potential problem is I also use...
  49. AudioEffectDelayExternal and ILI9341 display not compatable

    I've been away from the forum for several months, but working day and night on a compact Teensy 3.6 based music processor for real-time concert performance. Things have been going great until...
  50. Now I recall where I got the idea as to how fast...

    Now I recall where I got the idea as to how fast the latest rffts are. I have been using arm_rfft_fast_f32() in my new Audio block STFT based channel-vocoder (512 channels max) for electronic music...
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