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    In the T3.x case, you needed two pins, one for CS...

    In the T3.x case, you needed two pins, one for CS and one for D/C for the devices that do DMA buffering. I believe in the 4.0 case, you don't need a special pin for D/C. But I really haven't delved...
  2. Well you can download any program into the Teensy...

    Well you can download any program into the Teensy 4.0. You don't have to use the Arduino IDE, as long as you build a program that the downloader recognized. However, you can't change the actual...
  3. I don't believe there is a reset pad. The...

    I don't believe there is a reset pad.

    The on/off thing is new. If you connect the on/off pin to ground for around 5 seconds, the Teensy will turn itself off. It won't turn on until either the...
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    I believe the special CS pins are only if you use...

    I believe the special CS pins are only if you use device drivers that use DMA, such as several of the displays (ST7735, ST7789, etc.).

    There appears to be only one CS pin for DMA per SPI bus. If...
  5. Paul has to be the one to answer this. But I...

    Paul has to be the one to answer this. But I suspect it may have to do with the availability of the chipset used in the Teensy 3.2. If NXP stops selling that chip, Paul will have to stop selling...
  6. Note, Teensy uses a separate chip for the...

    Note, Teensy uses a separate chip for the bootloader.
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    I don't think the Teensy 4.0 has the alternate...

    I don't think the Teensy 4.0 has the alternate SPI pins like the Teensy 3.x/LC had. That's why the beta users were given a break out board that mapped the Teensy 4.0's pins to the pins the audio...
  8. Well the 3.2 typically runs at 96Mhz, and the LC...

    Well the 3.2 typically runs at 96Mhz, and the LC tops out a 48Mhz. Perhaps the Teensy 3.2 is running to fast for the device.

    Perhaps you need pull-up resistors on the CS pins.

    Perhaps you have...
  9. It has worked for me in the past, when I hooked...

    It has worked for me in the past, when I hooked up the RTC and soldered in the crystal. I would look into the solder joints on the crystal and Vbat/Ground. I dunno, maybe the crystal suffered from...
  10. Paul wrote this article some time ago, about...

    Paul wrote this article some time ago, about better SPI design:

    https://www.pjrc.com/better-spi-bus-design-in-3-steps/


    The simplest step is to try and use pull-up resistors on each of the...
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    Sticky: And try to do it in such a way, so that other...

    And try to do it in such a way, so that other platforms, particularly the M4 Adafruit uses, can add their bits.
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    Somebody else asked the same question over in the...

    Somebody else asked the same question over in the 1.47 announcement thread. You might want to watch that thread as well in terms of getting an answer:

    ...
  13. Paul has a copy of the IMXRT 1060 manual on the...

    Paul has a copy of the IMXRT 1060 manual on the pjrc.com site, so you don't need a login:

    https://www.pjrc.com/teensy/datasheets.html
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    Sticky: Are you using the Adafruit_RA8875 or RA8875...

    Are you using the Adafruit_RA8875 or RA8875 libraries. Typically the Adafruit libraries should work but they don't have Teensy specific optimizations. Unfortunately, the author (sumotoy) of the...
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    There is an urban legend that states Apple bought...

    There is an urban legend that states Apple bought a Cray whatever to help design their next computers doing layout, etc. while Seymour Cray is said to have replied that he used his Apple Mac (or...
  16. You can disconnect the USB power from the Teensy...

    You can disconnect the USB power from the Teensy by cutting the solder pad underneath the Teensy. It is the solder pad next to the VIN (5v) pin (see the back of your Teensy card). Then the Teensy...
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    I suspect it is too early for any of the boards...

    I suspect it is too early for any of the boards being designed to be available yet. There are some boards that you can send the gerber files to a PCB printer (like OSH park in the USA) and it will...
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    For long term usage however, you would be advised...

    For long term usage however, you would be advised to start transitioning to the Teensy LC (or 3.2 or even 4.0). Paul has posted that the Teensy 2.0 is nearing the end of its lifetime, so for new...
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    Unfortunately, the only pins that are brought out...

    Unfortunately, the only pins that are brought out on the Teensy 4.0 are Teensy pin 10 (B0_00) for MQS_RIGHT and Teensy pin 12 (B0_01) for MQS_LEFT.

    Page 309 of the manual states the alternate pads...
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    I suspect this is just impossible, unless you...

    I suspect this is just impossible, unless you resort to bit-banging (i.e. manually turning the pins on/off and not using the hardware supports, which would be sloooooooooooow). You have to...
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    There is the ever popular question: have you...

    There is the ever popular question: have you added pull-up resistors or does your device have pull-up resistors? You would want one resistor between SCL and 3.3v, and another between SDA and 3.3v. ...
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    These are power rails, similar to the power rails...

    These are power rails, similar to the power rails on a traditional breadboard. Typically one rail would be ground and one rail would be 3.3v. Typically you would solder either a row of female/male...
  23. I was thinking that perhaps there is enough other...

    I was thinking that perhaps there is enough other stuff declared static, and the buffer array is crossing the line between the two memory halves. Print out the begin and end addresses in hex to see...
  24. Yeah, I suspect when it is available, I will...

    Yeah, I suspect when it is available, I will order one (to go along with the Hallowing they started selling last year that had a M0 processor and a single 128x128 display). But it would be nice to...
  25. My one thought might be you are crossing the...

    My one thought might be you are crossing the threshold between lower memory and upper memory, and maybe you need to add the appropriate magic to put all of the buffer in low memory (or flush the...
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    Given the different pinouts between 3.x and 4.0...

    Given the different pinouts between 3.x and 4.0 for I2S, assuming the rev D board is only for Teensy 4.x, it may be helpful to those of us that serially buy boards over time, and toss them back into...
  27. Sorry (not sorry) about inflicting uncanny eyes...

    Sorry (not sorry) about inflicting uncanny eyes on you. :cool: :D
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    It may be in the case of older processors like...

    It may be in the case of older processors like the AVR processors without many registers, that you can get away without using volatile. But in general, I agree with TelephoneBill, that you want to...
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    Since uncanny eyes seems to be discussed in...

    Since uncanny eyes seems to be discussed in various places, I see Adafruit is soon going to release a mask with 2 240x240 displays and code for their M4 processor (along with a 9 pin cable). If...
  30. The Teensy 3.5 and 3.6 only support hardware...

    The Teensy 3.5 and 3.6 only support hardware single precision 32-bit floating point (i.e. float type). Double precision (i.e. double type) is done completely via software emulation. This means on...
  31. You connect the on/off pin to ground for 4-5...

    You connect the on/off pin to ground for 4-5 seconds, and the Teensy will turn off. Once you disconnect the Teensy on/off pin from ground and connect it again to ground for 1-2 seconds, the Teensy...
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    I don't know if it will work, but you might try...

    I don't know if it will work, but you might try an i2s to speaker solution such as:

    https://www.adafruit.com/product/3678?gclid=EAIaIQobChMI4fK-tf6A5AIVOP_jBx0ZwQQ1EAQYAiABEgL9u_D_BwE
    ...
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    There have been 4 audio shields released so far...

    There have been 4 audio shields released so far (not counting the new audio shield specifically for the T4):

    The real original audio shield had a black PCB (I was reminded of this when I looked...
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    And in the 1.47 announcement, it might help to...

    And in the 1.47 announcement, it might help to have a list of things that are known not to work on T4.
  35. It really depends from chipset to chipset (and of...

    It really depends from chipset to chipset (and of course the amount of effort put in by the compiler engineers, particularly ones that target a particular processor).

    Some chipsets do not have a...
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    Yeah, it was more I wanted to solder some...

    Yeah, it was more I wanted to solder some stacking headers on to the board to try some things out. And I guarantee you, no matter how shiny they are when I get them out of the bag, when I'm done...
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    Usually that works. UPS picks up the package on...

    Usually that works. UPS picks up the package on Thursday, and it is in Massachusetts on Friday before my office mail room closes for the day. This time, it got picked up from New York (Thursday...
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    In the 8-bit AVR systems (such as the Arduino...

    In the 8-bit AVR systems (such as the Arduino Uno), data space is rather limited, and things in read-only flash memory (i.e. the program) are not in the same address space as the data pointers. So...
  39. We can't answer #1, since we have no idea how...

    We can't answer #1, since we have no idea how much power the gamecube provides (or if you've hooked up anything else to the Teensy). It likely has enough power, but until you test it out, you won't...
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    Unfortunately, the author of the i2c_t3 library...

    Unfortunately, the author of the i2c_t3 library (nox771) doesn't seem to have posted to the Teensy forums since December 2018. So I don't know if the library is still being maintained, or not. ...
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    MISO1 and CS1 were omitted from the current...

    MISO1 and CS1 were omitted from the current pinout card. I imagine whenever Paul prints up a new one, they will add the information. I and others have reported this in the T4 beta thread. The...
  42. Generally it is a 'simple matter of programming'....

    Generally it is a 'simple matter of programming'. You may be the first person to want something.

    In the case of the Teensy, only the Teensy 3.6 and the new Teensy 4.0 support USB host mode (as...
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    One issue with i2c_t3.h is it is incompatible...

    One issue with i2c_t3.h is it is incompatible with Wire.h. Unfortunately, this means changing the Wire.h to i2c_t3.h in your .ino/.pde sketch (simple), and tracking down all libraries that use Wire,...
  44. In general, it should be pretty simple. Most of...

    In general, it should be pretty simple. Most of the IR remotes use standardized controls, and the IRremote library handles them:

    https://www.pjrc.com/teensy/td_libs_IRremote.html


    On the...
  45. My thought is i2c is made for low speed devices...

    My thought is i2c is made for low speed devices where you are only talking to one device. You are talking to 8 devices, so each of the other 7 devices must wait while you update 1. There are ways...
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    Look at the Teensy from the top with the USB...

    Look at the Teensy from the top with the USB facing right (i.e. the third image in https://www.pjrc.com/teensy/pinout.html).

    On the second row from the top, you will see 4 holes that take up the...
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    Possibly you are mis-wiring the board (which is...

    Possibly you are mis-wiring the board (which is where posting a picture showing the complete wiring can help, and posting your test program, i.e. rule 1 in these forums). Remember most of us are not...
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    I haven't used it, but I noticed in looking at...

    I haven't used it, but I noticed in looking at the product page, I see it says 'over 8Mhz SPI'. I would try and limit the SPI bus speed to 8Mhz to see if that helps. I've have some OLED displays...
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    Earlier in the thread, PaulS mentioned that...

    Earlier in the thread, PaulS mentioned that Teensy 4's were mailed to some non-USA distributors. So I imagine you need to wait for the distributors to get their stock and have it clear customs:

    ...
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    Not terribly surprising there seems to be a rush...

    Not terribly surprising there seems to be a rush on getting Teensy 4.0's.

    Yesterday, I noticed that Adafruit had them, and I debated ordering immediately, but I waited until the evening to order...
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