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    @Armadafg: I can't offer a specific "solution"...

    @Armadafg:

    I can't offer a specific "solution" but you should make sure that you are using the latest Teensyduino 1.55, just to make sure that you have the latest core support (including T_MM). ...
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    @vince.cemo: Paul has previously fielded...

    @vince.cemo:

    Paul has previously fielded requests for availability of small quantities of stock, for instance <here> . . . hope that helps.

    Mark J Culross
    KD5RXT
  3. Sounds like fun. Would something similar to...

    Sounds like fun. Would something similar to <this> be close to what you are looking for ?? It at least answers the speed question (specs 200ns, where you say you need <500ns). Sounds like you'd...
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    Sticky: @Mcu32: I'm sorry if you were offended by my...

    @Mcu32:

    I'm sorry if you were offended by my last post. In each of my previous posts, when directly addressing my comments to you, I either chose "Reply With Quote" (to supply the context for my...
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    Sticky: As my personal real-life example, the latest...

    As my personal real-life example, the latest version of my TeensyMIDIPolySynth (which now uses the RA8875 display with on-screen sliders & buttons, instead of the original hardware version using pots...
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    Sticky: Yup, and now the default is no lst files. The...

    Yup, and now the default is no lst files. The release notes clearly give the reason for the change.

    Mark J Culross
    KD5RXT
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    Sticky: @Mcu32: No matter which behavior is made the...

    @Mcu32:

    No matter which behavior is made the default, there will be a group of users who will be opposed. If the default is "disabled", then those that want/use the lst files will be offended (as...
  8. @Emmanuel: From my experience (definitely not...

    @Emmanuel:

    From my experience (definitely not an expert), when plugging the Teensy into my PC using the primary microUSB connector, I am able to use the Teensy as a MIDI device (input from the...
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    8-Dale: I was missing something very obvious...

    8-Dale:

    I was missing something very obvious !! I have not used MicroPython, so not recognizable as such to me. Sorry (both that I didn't recognize it & that I can't be of any help) !!

    Mark J...
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    Did you post the actual source that you are...

    Did you post the actual source that you are building & loading into the T4.0 ?? Are you using the Arduino IDE to build ?? What you posted does not build in the Arduino IDE & throws syntax errors on...
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    @PaulStoffregen: OK, thanks for the...

    @PaulStoffregen:

    OK, thanks for the clarification of your reply. I understand that I missed at least one key point: writing the key bits on a locked Teensy has to be done by a program signed with...
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    @PaulStoffregen: As a thought experiment, I'm...

    @PaulStoffregen:

    As a thought experiment, I'm wondering if the following would be possible:

    1) Elsewhere (security document/description) it is covered that the key fuses start at '0' & are...
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    I am working against the exact same challenge...

    I am working against the exact same challenge (RA8875 fonts) & I did look at the examples noted. I do have a few additional questions:

    1) what is the path to the font files ??
    2) it seems that...
  14. @dannytaurus: Have a look at

    @dannytaurus:

    Have a look at <this thread>, which appears to describe a successful implementation with the 6N137.

    Mark J Culross
    KD5RXT
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    Excellent, thanks !! Mark J Culross KD5RXT

    Excellent, thanks !!

    Mark J Culross
    KD5RXT
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    Paul: Thanks for the great work that you have...

    Paul:

    Thanks for the great work that you have put into this . . . I am excited to give this a try. One question does come to mind: Will pressing the "Generate Key" button cause a warning if there...
  17. Looking just at your "while" loop, you seem to be...

    Looking just at your "while" loop, you seem to be incrementing "i" too soon.
  18. Maybe try

    Maybe try <here>
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    Make a call to see if it exists & if so, use the...

    Make a call to see if it exists & if so, use the O_APPEND flag, otherwise (does not exist) use the O_CREATE flag ??

    Mark J Culross
    KD5RXT
  20. <This thread> may be helpful.

    Mark J Culross
    KD5RXT
  21. Maybe try ...

    Maybe try <this link> as a simple example, with explanations of not only how, but also what & why.

    Mark J Culross
    KD5RXT
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    @RJF: As recommended to you in the other...

    @RJF:

    As recommended to you in the other thread, your report needs a *specific* reference (URL, link, etc.) to where you see the incorrect information. Just trying to use " . . . even though all...
  23. Glad to be able to help !! Sorry, I don't know...

    Glad to be able to help !!

    Sorry, I don't know the answer for your follow-up question. If the error appears on a PJRC website, there's <this thread> where you can report it. If it's some other...
  24. Might try the following: ...

    Might try the following:


    analogReference(EXTERNAL);


    Mark J Culross
    KD5RXT
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    One possibility: define a variable [ start_millis...

    One possibility: define a variable [ start_millis = millis() ] to store the millis() value at the start of your ramp period. After each 100ms delay(), calculate how many millis have actually passed...
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    @frohr (Michal): I believe that the following...

    @frohr (Michal):

    I believe that the following would be the minimum required: RA8875_CS, RA8875_RESET, RA8875_MOSI, RA8875_SCLK, Power & Ground.

    Mark J Culross
    KD5RXT
  27. @kern: Please understand that I am not being...

    @kern:

    Please understand that I am not being critical . . . I really do want to try & help you to solve your problem !! You have stated that you have 576 LEDs. However, I still don't know how...
  28. @kern: You say that you have checked your...

    @kern:

    You say that you have checked your wiring, but you don't give any info on how that wiring is actually done. Without specific wiring info, it's hardly possible to provide any useful help !!...
  29. @jonr: Thanks for that tidbit !! Do you do this...

    @jonr: Thanks for that tidbit !! Do you do this on both sides of a 2-layer PCB & they are thus connected to each other ??

    Mark J Culross
    KD5RXT
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    If you have not already loaded TD 1.54beta9, you...

    If you have not already loaded TD 1.54beta9, you might try that . . . it contains a fix for at least one core bug which caused a delay/hang of approximately 1.7 seconds (in my case, it caused MIDI to...
  31. You do intend to share the fix so that it can be...

    You do intend to share the fix so that it can be permanently fixed for you & everyone else, right ??

    Mark J Culross
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    @PaulStoffregen: I can verify that using...

    @PaulStoffregen:

    I can verify that using 1.54beta9 fixes the freeze in my updated TeensyMIDIPolySynth (this version fixes/works equivalent to the manually applied fix which was initially proposed...
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    SteveSFX: The "PZEM" was just a placeholder. ...

    SteveSFX:

    The "PZEM" was just a placeholder. For your definition of the pzem array, you'll need to define the array using the same type as pzem1-pzem5. As I tried to indicate, without a full...
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    SteveSFX: This is all extemporaneous, so you...

    SteveSFX:

    This is all extemporaneous, so you may have to make some adjustments for it to compile & run.

    Maybe setup the array so that it contains a pointer to (which is essentially the address...
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    This has me wondering what the original...

    This has me wondering what the original native-language sentence might have been that translated to "Hi, dogs who are lost." :confused: !!

    Mark J Culross
    KD5RXT
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    As a point of reference for comparison, in the...

    As a point of reference for comparison, in the initial hardware version of my TeensyMIDIPolySynth, I used 74HC595 shift registers to drive 42 LEDs , as well as 2 x 7-segment LED displays (*all* of...
  37. In my non-PCB projects, I solder 48 pins to the...

    In my non-PCB projects, I solder 48 pins to the bottom of the Teensy 4.1, & mating sockets to the top of the Audio Shield. The Audio Shield is installed onto the bottom of the T4.1. I also solder...
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    Michal: Here's a

    Michal:

    Here's a <link> to some discussion which includes my pin connections & a simple test sketch (do not be scared by the fact that I was seeking assistance - I fixed my problem by making sure...
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    I have been very pleased with the

    I have been very pleased with the <ER-TFTM070-5> 7" TFT display from buydisplay.com. Support for the RA8875 controller chip is available by default after installing TeensyDuino.

    Select the...
  40. On the latest version of my TeensyMIDIPolySynth...

    On the latest version of my TeensyMIDIPolySynth project, simply selecting "Smallest Code" optimization (initially selected because code was exceeding available space) also reduced the RAM usage on my...
  41. Here's a

    Here's a <link to the thread> where EEPROM writes were previously not working for T4. You might try the test program from that thread on your LC to see if it helps to reproduce the problem easily,...
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    Jonathan: I would think that one obvious...

    Jonathan:



    I would think that one obvious approach would be to add another dimension to the envs array (logical), rather than just mutiplying the number of envs (very confusing !!) when...
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    @ALDad: Posting your modified sketch (see...

    @ALDad:

    Posting your modified sketch (see Forum Rule above) would make it much easier for anyone else to analyze why it might not be working as you expect.

    So, without benefit of the modified...
  44. @zapta: Check

    @zapta:

    Check <this thread> to see if it answers the same question that you are asking . . .

    Mark J Culross
    KD5RXT
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    @nobody3: Do you know if the CP750 is expecting...

    @nobody3: Do you know if the CP750 is expecting CR, LF, or CR/LF at the end of the serial stream ?? Which these different options for line termination have you tried ??

    Mark J Culross
    KD5RXT
  46. The two added wires are +5VDC & GND directly...

    The two added wires are +5VDC & GND directly between the PowerBoost 1000C & the display (as indicated in my earlier post, this was an attempt to rule out the very thin traces on the PCB, jut in case...
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    Useful commands to get network info on/from a RPi

    For the RPi (& most other linux devices), simply typing "ifconfig" without the quotes in a terminal window will show you lots of network interface information (if you get a "not found" error, try...
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    If I understand your question correctly, the...

    If I understand your question correctly, the short answer is as follows:

    IPAddress ip( [ whatever IP address that you want your Teensy to respond to / act as on your network ] );
    IPAddress myDns(...
  49. Kurt: Thank you . . . all great suggestions. ...

    Kurt:

    Thank you . . . all great suggestions. I am moving the modules (Teensy, Audio Adapter, PowerBoost 100C, & RA8875 display) between the wired prototype & the PCB (both boards are socketed). ...
  50. Kurt: Thank you for your reply. When I...

    Kurt:

    Thank you for your reply. When I started this effort to transition from the ILI9341 to a larger display, I read the detailed thread from when the RA8875 library was being optimized for the...
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