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    Just thought I would put this picture up in...

    Just thought I would put this picture up in passing. Shows my previously incarnation from 2017 of a carrier board for 48-pin Teensys, here a T3.6. The new PCBs are a more flexible variation on this,...
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    So, I took a picture of my project. With KurtE's...

    So, I took a picture of my project. With KurtE's help got both Lcds working off a single SPI port now.

    There is a T4.0 tucked under the 2 Lcds, and the T4.1 board to the right mounts underneath....
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    Dang, my calculator keeps throwing an operator...

    Dang, my calculator keeps throwing an operator error. Must need new batteries. 1,000,000 loops in 0.108 sec corresponds to 9.25-MBytes/sec or 74-Mbps, not 128-Mbps.

    I reran the graphicstest demo...
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    Wow, things are happening so fast anymore. Just...

    Wow, things are happening so fast anymore. Just noticed this thread (been living in a cave here). Can a Teensy 5.0 running 2.7-GHz be far behind, lol? Adafruit has a couple of her own hw/sw...
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    My Latest 2-GHz Dual-Core Teensy Project

    Just a mention of my latest Teensy project, using (2) T4.x modules. So I started this post over here:
    https://forum.pjrc.com/threads/66771-MicroMod-Beta-Testing?p=278162&posted=1#post278162

    I...
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    A little more testing on the spiwrite() function...

    A little more testing on the spiwrite() function from the original post. Finally got around to using digitalWriteFast() and it executes 1,000,000 loops in 108-msec. Equivalent to about a 128-MHz SPI...
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    @KurtE. Quick follow-up. Regarding running 2...

    @KurtE. Quick follow-up. Regarding running 2 ILI9341 Lcds both from SPI0 on the T4.0, I got that working simply by moving the 2nd Lcd's Reset to a separate I/O pin. So, thanks for the help, :-).
    ...
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    Thanks Kurt, I'll try some more things today....

    Thanks Kurt, I'll try some more things today. I've been rewiring hardware the past couple days.
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    Now, I have another question. I put that bit-bang...

    Now, I have another question. I put that bit-bang code into a for-loop and ran it 1,000,000 times. It took 322-msec, so that's about 3.1-MBytes/sec, or equivalent to a 31-MHz SPI bit clock.

    So,...
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    Soft SPI on T4.x

    1. First off, I've tried to find a Soft SPI library for Teensy 4.x, but found little. Does someone have one? You'll know why I ask in a bit.

    So, I d/l'ed Teensyduino v1.53 to Arduino IDE v.1.8.12...
  11. Oh well, never mind. Fixed it. Turns out if RST...

    Oh well, never mind. Fixed it. Turns out if RST is set to 0 or 1, then UART1 hangs. Works for other values including -1. I guess I've used the old Adafruit ST7735 library for too many years where it...
  12. Problem with ILI9341 and UART1 on Teensy 3.2

    Sorry if this has been answered previously, but I did do a google search.

    So I'm using a Teensy 3.2, IDE 1.8.7, and Teensyduino 1.48 (installed 11/10/2019). The basic Adafruit ILI9341 graphics...
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    Yes, the ends are slightly more than 1/2 the...

    Yes, the ends are slightly more than 1/2 the distance between pins. However, still probably easier than cutting with pliers and trimming with a Dremel. I just took 2 of the female headers, and held...
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    Or 3/ea 8-pin headers, easier to find but may be...

    Or 3/ea 8-pin headers, easier to find but may be a bit more expensive. I bought 100/ea of 8-pin and 100/ea 6-pin stackers from ebay a couple of years ago, and been using them on everything. Similar...
  15. Thought I would address the breadboard issue a...

    Thought I would address the breadboard issue a bit more, in regards making a T3.x with additional parallel rows of pins on the top and/or bottom edges. Cosford mentions here a viable solution.
    ...
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    Aha, so simple. Thanks.

    Aha, so simple. Thanks.
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    Yes, very astute remote debugging on GW's part!!...

    Yes, very astute remote debugging on GW's part!!

    I had the same problem. I would use USB-serial with my T3.x boards, which required the ... while (!Serial()) ... line in the setup() in order to...
  18. Michael, see the private message. Also, I had...

    Michael, see the private message. Also, I had once thought about maybe selling them, but actually there was a big gold rush of people producing carrier boards when the T3.5,3.6 came out, and I lost...
  19. Duh, and I saw that thing too, double-Duh! Other...

    Duh, and I saw that thing too, double-Duh! Other than pleading "total stupidity, have mercy", I guess I can say it doesn't look like that Ada adaptor will adapt a T3.6, which could be done with a...
  20. I was just looking at Digikey and they sell a lot...

    I was just looking at Digikey and they sell a lot Feather "Wings", which are the Ada add-on boards, so it would make sense for Paul to produce a board that can accomodate the Wings. Unfortunately the...
  21. Too late, the dogs of war are already gathered,...

    Too late, the dogs of war are already gathered, :-).

    The trouble with Feather and Arduino-MKR form-factors is they do not have enough I/O pins to even be remotely attractive, although having...
  22. https://www.adafruit.com/product/2772 The...

    https://www.adafruit.com/product/2772

    The Feather board, that people keep bringing up, is like comparing a 1918 Model-A Ford to a 2018 Audi. Feather basically has the power of a T-LC, and only 20...
  23. Maybe Paul should trademark "Eeensy Weensy...

    Maybe Paul should trademark "Eeensy Weensy Teensy" before it's too late. Also, FYI:
    https://www.kididdles.com/lyrics/e001.html
  24. Paul has the great fun of trying to be all things...

    Paul has the great fun of trying to be all things to all people, :-).

    - I use T3.1,3.2 for most projects, and rarely need all of the available I/O pins as it is, although some of my robots do use...
  25. Or, you just do the same as whatever you do now,...

    Or, you just do the same as whatever you do now, you just have 2X as many.
  26. Umm, that would have to be the Weengsy and not...

    Umm, that would have to be the Weengsy and not the Wingsy, although it would be pronounced the exact same way, at least in America.

    I have a number of projects where I've soldered R-A headers into...
  27. If by this you mean UNO-formfactor, then it...

    If by this you mean UNO-formfactor, then it wouldn't be a "Teensy" anymore. However, if Paul keeps designing new boards with oodles more I/O pins, then he'll have to bite the bullet in some manner or...
  28. Single-layer pcbs = out of the question, probably...

    Single-layer pcbs = out of the question, probably also for 2-layer; but extra pins along the edges may make routing slightly easier.

    No one in their right mind would build a system on a...
  29. Yes and no big deal, as I see it, considering the...

    Yes and no big deal, as I see it, considering the added convenience. Also, if there are plans for future boards having even more I/O pins, this would be a "relatively" painless way to go. And for a...
  30. Is there a link to this putative Teensy 4.0? I've...

    Is there a link to this putative Teensy 4.0? I've done a google search but not quite found what looks to be such a thing.

    I'm not suggesting Paul do this, but if I were adamant about bringing the...
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    Also, I am not controlling the RFM radios...

    Also, I am not controlling the RFM radios directly with the T3.1 here, as the T3.1 already has lots of work to do with ethernet and everything else, and I've wanted to keep the lone T3.1 SPI port...
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    Aha, that link is not on the main Products page.

    Aha, that link is not on the main Products page.
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    Paul, is there a replacement for this? Ethernet...

    Paul, is there a replacement for this? Ethernet not shown on your products page.

    https://www.pjrc.com/store/wiz812_adaptor.html
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    The RFM radio stuff is not shown on the webpage...

    The RFM radio stuff is not shown on the webpage as yet. For the remote nodes, I am currently using the RFM69 radio at 100-mW along with the Moteino-Mega-1284 modules from lowpowerlabs. 100-mW is the...
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    Update to what I did a couple of days ago. I...

    Update to what I did a couple of days ago.

    I am using the Teensy 3.1 in a home security alarm system, which has multiple sensors (IR detectors, PIR, sonar, environmental, &etc), Ethernet to my...
  36. Paul, thanks, I wondered about the 1-usec vs...

    Paul, thanks, I wondered about the 1-usec vs 3-usec thing at the top of the screen.

    I think your figures illustrate my point about the latency in the T3.1,3.2 SPI xfer, although it's not quite as...
  37. Cool, I always love it when I create an instant...

    Cool, I always love it when I create an instant firestorm, :-). I was in court this week, and managed to create one there too (audible gasp from the adverse party!!).

    Paul,
    1. I'm sorry, but I'm...
  38. Other people might disagree with me but ... from...

    Other people might disagree with me but ... from my experience ... even fiddling with those register values, you're still not going to get SPI data transfers as fast as on a 16-MHz Arduino. At least...
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    variable historical tracking

    I thought I would share this with the group. It's possible someone else already invented the idea, in which case "Never Mind", :-). Someone might take a look at the code, and see if I have made any...
  40. Good find, Frank. It sounds like, for proper...

    Good find, Frank. It sounds like, for proper reset, the SD spec wants a pullup on CS, I am assuming, at the time when power is applied to the card. Is that how you interpret it? In which case, the...
  41. BTW, one thing I recall is that there are 2...

    BTW, one thing I recall is that there are 2 different sketches in the SD library examples folder, CardInfo.ino and listfiles.ino, and the former never worked properly for me, going all the way back...
  42. Hmmm, I see I made a lot of posts on this thread....

    Hmmm, I see I made a lot of posts on this thread. Since then, I have been working on other projects and not using SD cards on my T3.6 boards, so I've had no follow-up.

    Frank, what size SD card are...
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    "well-known" - maybe not the best choice of...

    "well-known" - maybe not the best choice of terms, :-).

    When this was going around a couple of years ago on the arduino forum, Bill Greiman said he had implemented the extra Sclk pulses into the...
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    dave, there is a well-known problem with trying...

    dave, there is a well-known problem with trying to use SD cards on the same SPI buss with anything else. The problem is SD does not release the MISO pin properly after CS is de-asserted. You can...
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    Aha, ok I held Prog for "exactly" 15-sec, and it...

    Aha, ok I held Prog for "exactly" 15-sec, and it did wipe the program this time, but did not fix the finger-blistering problem. So I guess it's T3.5 = RIP.
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    Actually, holding down Prog [and also Reset] for...

    Actually, holding down Prog [and also Reset] for 20+ sec did NOT wipe the program, and also did not fix the overheating problem. You apparently need input from the IDE before the program is wiped....
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    Thanks, I had not heard of that trick, and tried...

    Thanks, I had not heard of that trick, and tried several times to no effect.
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    No matter how it's being powered, the MCU gets...

    No matter how it's being powered, the MCU gets hot enough to burn your fingers. The 720 mA is all drawn by the Teensy module. The 3.3v buss pins on the module headers all read proper 3.3v. Even so,...
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    Truth is, I have no idea whatsoever how all the...

    Truth is, I have no idea whatsoever how all the buss voltages can be reading ok, the module can be drawing 720 mA, and the cpu chip being hot enough to burn your fingers, and it's still running the...
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    Ah, very astute. PTC is "gone", I pulled it off...

    Ah, very astute. PTC is "gone", I pulled it off the board first thing. Along the way, I discovered the board came back to life when I shorted across the PTC with a screwdriver, so I tried to solder a...
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