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Type: Posts; User: DerekR

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  1. Replies
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    Hi Dan, Welcome back:D I presume you are aware...

    Hi Dan, Welcome back:D I presume you are aware of the two other break-outs that have been released over the past few weeks? Both use castellated cutouts to contact all of the under-board pads. ...
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    Yesterday I received two packages in the mail,...

    Yesterday I received two packages in the mail, (a) more T4s to destroy, and (b) samples of FRDM4236's board. So I got to work and assembled two of my slightly modified (stretched) versions of...
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    @dkryder, Don't think I gave up without trying...

    @dkryder,
    Don't think I gave up without trying :rolleyes: I sent a couple of hours trying to prise them apart... It was just not possible to heat the pins through both boards and extract the pins. ...
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    My bad, in fact my very, very bad today:( :( :( ...

    My bad, in fact my very, very bad today:( :( :( So, I was all very pleased with myself this morning when I wired up breakout #2. Everything went swimmingly, I soldered all the castellations,...
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    Well, I had a very pleasant and unexpected...

    Well, I had a very pleasant and unexpected surprise today! I had ordered my modified versions of Blackketter's breakout board in 0.8mm thickness from OSHpark before we learned of the woes with...
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    That would be fantastic, thank you very much. ...

    That would be fantastic, thank you very much. Yes, I'm in the USA (Mass). I'll PM you with the details.

    I've been getting quite frustrated lately because I've tested most of my code on the T4...
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    Looks very good, and I'd certainly like to try...

    Looks very good, and I'd certainly like to try it! I note you are using 0.8mm board thickness. Several of us have tried OSHpark with @blackketter's design with 0.8mm and found that routing of the...
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    Next questions: 1: What do think of Dan's...

    Next questions: 1: What do think of Dan's (@loglow) SMD 2x5 header to connect to the lower board vs the castellated cut-out? Personally, having built many T3.6 breakouts from loglow, I like them.
    ...
  9. Sounds to me like a "ground-loop" caused by...

    Sounds to me like a "ground-loop" caused by common currents in the power line connection. These can be real nasty to track down because they can be dependent on your wiring. I've had that problem...
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    Hi guys - How did the pogo pins on Paul's beta...

    Hi guys - How did the pogo pins on Paul's beta breakouts work out - were they reliable? While playing around in KiCad this afternoon I started wondering if that might be the way to go???
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    Michael, I'm very frustrated. I want/need to...

    Michael,
    I'm very frustrated. I want/need to get going with using the T4 in real tasks, but unless I can get at all those pins, I'm stuck. I started to build a prototyping board this morning...
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    I would think that this is a hardware problem,...

    I would think that this is a hardware problem, not a software problem, unless your sawtooth has a very, very low frequency.

    I don't follow what the sawtooth is actually doing in loop() is it just...
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    Re thicker boards - you can purchase male headers...

    Re thicker boards - you can purchase male headers with longer pins that will make the soldering easier on the top. I have a few with long pins on both sides. And it's relatively easy to move the...
  14. Andy - You beat me!!! I didn't get very far at...

    Andy - You beat me!!! I didn't get very far at all today, I could find my plastic bag of female headers :( We have a local electronics parts store that's closed on Sundays, so I'll be able to get...
  15. From defragster: J and that is where I'm totally...

    From defragster: J
    and that is where I'm totally confused!

    The T3.6 had a bunch of alternate pins for the SPI bus and it was necessary to use those alternates to have the TFT and audio board...
  16. I've run the T4 with the ILI9341 Display, and the...

    I've run the T4 with the ILI9341 Display, and the T4 with the Audio Board, but not all three together.
    That's my job for tomorrow. To be honest I'm still a bit confused as to whether they will...
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    Now there's a coincidence! Just today I uploaded...

    Now there's a coincidence! Just today I uploaded to the forum (for another member) a couple of my AudioGrabber Audio Library objects that let you extract blocks of data from the internal audio data...
  18. Thread: fft overlap add

    by DerekR
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    I found this old test sketch that I wrote a...

    I found this old test sketch that I wrote a couple of years ago. I think it might do exactly what you are asking about. As it is it doesn't do anything useful:
    1: It takes an Audio block, and...
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    @LoShu -As you requested I have attached a zip...

    @LoShu -As you requested I have attached a zip file 17804 containing two "grabbers":
    1 AudioGrabberComplex256
    2 AudioGrabberReal256
    in separate folders, each with a simple example of their use.
    ...
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    Sure. Do you want the complex or real? Give me...

    Sure. Do you want the complex or real? Give me an hour or so... I'll upload them both on the forum under this thread.

    Aside: I was getting the grabbers ready to upload as a library to GitHub...
  21. @defragster: Fantastic - works like a charm. ...

    @defragster: Fantastic - works like a charm. It was driving me crazy!
    I find it hard to believe that I'm the only one who had this problem.
    Thanks a bundle,
    Derek
  22. Teensyduino Bug(?): "Bricking" of T4 on program upload

    For the past three days I've been trying to track down a bug that "bricks" the T4 on program upload! I now believe it's a genuine problem in the Teensy code.

    I was preparing some Audio Library...
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    I've been thinking the same as @blacketter. ...

    I've been thinking the same as @blacketter. I've been playing with concurrent tasks on the two cores of the ESP32 with FreeRTOS, and I'm impressed. I believe it might be a good time to think of a...
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    I read through a press release on the 1170 today....

    I read through a press release on the 1170 today. All I can say is WOW! When I read of the dual-cores: 1GHz M7 + M4, I am already wanting to sign up! @Paul - are you taking pre-orders? I'm...
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    I was just playing with rectangular pads. I...

    I was just playing with rectangular pads. I think they would be more resistant to tearing from the board.
    However, this IS blackketter's project. I think we should respect that, and work with...
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    Seeing as I already have the board in KiCad I'll...

    Seeing as I already have the board in KiCad I'll take a shot at playing with the layout, drill size, pad sizes, etc
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    Yep - just like mine. I'll look into oshPark's...

    Yep - just like mine.

    I'll look into oshPark's policies on returns/manufacturing errors. But I don't know about the hole plating on such small holes, it may be just not feasible...
    ...
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    Well, that's a total fail and a huge...

    Well, that's a total fail and a huge disappointment! Mine just arrived, and all three are headed for the trashcan.

    1) The lower cut-out is completely missing, ie it's solid!
    2) The plating on...
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    Mine shipped yesterday (10/1)... will try them...

    Mine shipped yesterday (10/1)... will try them out as soon as I get them.

    BTW - Yesterday I uploaded to OSHpark my modified version with space between the side header rails, as in post #36. I...
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    @KrisKasprzak Wow, that's very interesting about...

    @KrisKasprzak
    Wow, that's very interesting about the ILI9341 libs! I think I'll splurge and get one. I did ask about HX8357 somewhere on the forum but got no response.
    (I've also been thinking...
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    Adafruit has a 3.5" 480x320 HX8357 display for...

    Adafruit has a 3.5" 480x320 HX8357 display for $39.95 (expensive) here. The also have a library for the HX8357 which can be down loaded. There is also a "Feather Wing" version which is currently...
  32. Thread: Teensy SDR help

    by DerekR
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    You might also take a look at AudioSDR here...

    You might also take a look at AudioSDR here. It is a single Audio Library object that contains a complete SDR software package, but it is designed expressly for f32 processing and therefore needs...
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    It seems that this thread has split into a couple...

    It seems that this thread has split into a couple of somewhat disparate conversations:
    1) Getting the audio library 4096 FFT to work, which I think has been established?
    2) Analyzing/displaying...
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    I am about to publish a set of Audio Library...

    I am about to publish a set of Audio Library compatible objects for the T3.6 that were created for live performance. Unfortunately I had to stop working on the project last year for health reasons,...
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    A couple of suggestions: 1) In the original...

    A couple of suggestions:
    1) In the original post it was mentioned that it was only the lower part of the spectrum that is of interest. You might try a "zoom FFT" approach (google it), and examine...
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    A couple of minor things to think about: 1) ...

    A couple of minor things to think about:
    1) PJRC has announced a new revision of the Audio Board for T4 that will be released any day now. In the meantime you can still use the current boards,...
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    @loglow - Hi Dan. I haven't been very active on...

    @loglow - Hi Dan. I haven't been very active on the thread because the breakout has continued to work well (except for pins 35&36). I have it running 24/7 on all sorts of software and peripheral...
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    The Teensy Audio Board/Audio Library supports...

    The Teensy Audio Board/Audio Library supports SPDIF IO, and multi-channel TDM (time-division-multiplex) through the CS42448 chip...
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    @defragster - Wow! What a massive effort by...

    @defragster - Wow! What a massive effort by @tonton81 et al (including yourself)! It looks exciting BUT from skimming the thread it also looks like the devil is in the details for implementation...
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    How strange! I had just started to bread-board a...

    How strange! I had just started to bread-board a T4 and a ESP32 with a built-in ILI9341 display, and was sitting here pondering the best way to have them transfer data to and fro -in particular from...
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    @blackketter - I've made a minor change to make...

    @blackketter -
    I've made a minor change to make the breakout compatible with my prototyping boards (VELLEMAN Eurocard 3-Hole Island PC Board (ECS3)) by adding a 0.1" gap between the the two rows of...
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    I agree in principle with @luni but look at the y...

    I agree in principle with @luni but look at the y scale: the graph axis is given at intervals of 5000 steps! What I don't understand is that the glitch seems to drop down and then recover almost...
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    This has been done for quite a while now for use...

    This has been done for quite a while now for use with loglow's breakout boards for Teensy 3.X on Tindie.
    Use flux, tin the pads first, and use solder braid to clean the pads just leaving a thin...
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    Debouncing is real easy. Basically you just...

    Debouncing is real easy. Basically you just put a capacitor across the switch. When the switch opens the capacitor charges through the pull-up resistor, and the voltage rises "slowly". I'm not...
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    What sort on encoder are you using - optical?...

    What sort on encoder are you using - optical? mechanical? Is it the quadrature type?

    If it is mechanical - you may need to debounce the switches electrically (R-C network). That could be the...
  46. @MichaelMeissner: I was basing the need for...

    @MichaelMeissner: I was basing the need for resolving conflicts between the display and the Audio Board on Paul's description when describing the SPI library here:

    I presume when he says "Audio...
  47. Teensy 4: SPI using Audio Board and TFT display?

    On the PJRC page for the 2.8" TFT display (here), Paul gives the T3.x SPI connections for the display, with and without the Audio Board. This page has not been updated for use with the T4.
    I'm...
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    @firehopper, @dkryder - Thank you so much - ...

    @firehopper, @dkryder - Thank you so much - that worked. I didn't even remove the Teensy from the breakout, just held down program button as suggested, and it came back to life :D I didn't know...
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    Help!!!

    I seem to have bricked my T4 by simply pressing the mini-tactile power on/off switch!!! I simply tried it as part of the debugging of the breakout, and the T4 turned off after the five seconds but...
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    Where can I find KurtE's pintest? I looked on...

    Where can I find KurtE's pintest? I looked on GitHub.
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