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  1. I really appreciate the extra depth, Paul. ...

    I really appreciate the extra depth, Paul.

    Now just indirectly directly related to the port expander, as I'm thinking aloud -

    My current project uses gyro/IMU data (among many other things!)...
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    Ouch, sorry to hear that and hope you are back on...

    Ouch, sorry to hear that and hope you are back on track!

    I've been working on the same project for ~2 years now... setbacks like these (i.e. 20 hours of work trying to fix a problem that ended...
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    Now the computer won't see the Teensy and...

    Now the computer won't see the Teensy and something's (DMG2305UX mosfet) gets too hot to be functioning normally... I guess it's time to order a new one and start over :mad:

    Thanks again for the...
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    While checking my wiring on the Teensy end, I had...

    While checking my wiring on the Teensy end, I had to remove the hot glue which resulted in then needing to resolder several of the SDIO pads. In the process I tore off the GND pad completely. ...
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    neurofun - those are some black and white facts,...

    neurofun - those are some black and white facts, thank you (and defragster) for removing all ambiguity.
    I'm working on it now, will report back once it's working.
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    I flipped the pins, both mirroring both the...

    I flipped the pins, both mirroring both the original 1-to-1 layout I had originally, and then I tried it again but staggering the last couple of pins per neurofun's example. Then I put it back and...
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    Hmm. Looks like I need to reverse the pin order,...

    Hmm. Looks like I need to reverse the pin order, from what I'm seeing in that second thread. Crossing fingers this is the answer :-)
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    Can anyone else confirm how they have their SD...

    Can anyone else confirm how they have their SD cards connected to the T4, and which libraries/sketches they are using successfully (and with what changes made, if any) - in the same manner neurofun...
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    I'm assuming you're using the original SD library...

    I'm assuming you're using the original SD library (v1.2.2), instead of SdFat-Beta? I tried CardInfo.ino from the builtin examples as you did, with the same code change and the same wiring, it still...
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    You're right, the files are huge. Even the...

    You're right, the files are huge. Even the .PNG's, wow. Fixing now.
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    Hi neurofun, thanks for the info, wish I could...

    Hi neurofun, thanks for the info, wish I could say that worked.

    I could use some help sanity checking this if one of you guys wouldn't mind - running out of ideas. Here are some pics.

    Here...
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    Thanks for the response. Tried a cap between VDD...

    Thanks for the response. Tried a cap between VDD and VSS (3.3v and GND) on the card holder and no go. Looks like that's where it should be according to that breakout schematic.

    Looks like I can...
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    Optimal microSD pins on the Teensy 4.0?

    I've read that the latest version of Bill Greiman's SdFat library (version 2 Beta) is now compatible with the Teensy 4.0:
    https://forum.pjrc.com/threads/57669-SdFat-SDIO-for-Teensy-4-0

    So......
  14. Defragster, thank you! This was one of those...

    Defragster, thank you! This was one of those things I struggled with early on and found a way out of via i2c_t3, as a side effect it became the ONLY method I knew (at least for the extra busses). ...
  15. Using multiple I2C busses without i2c_t3? (Teensy 4.0)

    Hello,
    How would I use the additional I2C busses on the Teensy 4.0, without something like the i2c_t3 library I'd been using with the T3.6? I don't know how to avoid being limited to SCA/SDL 0. ...
  16. Thanks. I've been down the road of I2C bus...

    Thanks. I've been down the road of I2C bus devices a few times now, mainly just curious as to how the speed and bit width disparity between the Teensy and a chip like this actually plays out. But...
  17. Port Expander compatibility - MCP23017 + Teensy 4.0

    It looks as if the MCP23017 is sold as a general purpose port expander for a wide range of 3.3v-5v platforms. Is there anything to be concerned about, if I use this with a T4.0?

    For example the...
  18. And... hello to another synth-oriented maker! :)

    And... hello to another synth-oriented maker! :)
  19. I'm not sure what the problem is here but...

    I'm not sure what the problem is here but generally I'd suggest checking out the Teensy enhanced I2C (Wire) library replacement, i2c_t3: https://github.com/nox771/i2c_t3

    It will also give you the...
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    Brendon, did you figure it out? I'd like to...

    Brendon, did you figure it out?
    I'd like to know if any of the extra info I posted was helpful or if it was something else, and to be honest I've got a few ST7735's I gave up on before moving to...
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    A quick glance of your function vs mine shows a...

    A quick glance of your function vs mine shows a number of differences, and also notice there is a section in mine I needed to change because by default the red and blue were swapped once I got it...
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    Try replacing SdFatSdio sd; with - SdFatSdioEX...

    Try replacing SdFatSdio sd; with -
    SdFatSdioEX SD;
    (beware that if you type that with a capital SD, you will have to change references to sd later in your code to SD, it's case sensitive)

    That...
  23. I found the information needed, here: ...

    I found the information needed, here:
    https://forum.pjrc.com/threads/40871...file-read-fail

    I had to modify the final code kindly provided by that thread's OP so it'd work with my ST7789 TFT,...
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    Thanks guys, even though it's going on 3 years...

    Thanks guys, even though it's going on 3 years old this information helped me solve my problems encountered with displaying bitmaps via SDfat library-driven SD card + ST7789 240x240 TFT display. I...
  25. Converting an example to SDfat from SD library

    I need to get this simple sketch to use the SDfat library instead of the default SD.

    If anyone can tell me what I'm doing wrong I'd greatly appreciate it. I've tried to cut it down to the bare...
  26. Ok - I've been including 2 screen libraries, even...

    Ok - I've been including 2 screen libraries, even though I am using a ST7789 240x240 1.3" display:
    #include<ST7735.h>
    #include<ST7789.h>

    This is because, in some earlier research I'd done to...
  27. This works, as in I can now load files from SD...

    This works, as in I can now load files from SD and display text and primitives onscreen. But to display a bitmap... still no go. But I left it on and after long enough it started displaying...
  28. If anyone's looked at this - apologies, came back...

    If anyone's looked at this - apologies, came back to it less frustrated to find there's more work I need to do to first before bringing it here - please disregard the code and let me narrow it down...
  29. Cannot display bitmaps, T3.6 w/ ST7789 w/ onboard SD

    Not sure why this is so difficult (spent 3 hours on it now) but I can't get a bitmap to display on my otherwise working T3.6 w/ 240x240 ST7789. I'll get "BMP format not recognized" no matter what...
  30. Generally speaking, how much of an impact does...

    Generally speaking, how much of an impact does the MCU speed have on graphics draw time?

    I would assume a lot of impact when going from an AVR platform to ARM, but is there a point beyond which...
  31. Exactly what I was looking for KurtE... will give...

    Exactly what I was looking for KurtE... will give these methods a shot. And, the pins are configured as shown in my code so looks like I'm optimal there, glad to have a better understanding.
    ...
  32. I got this working with an Adafruit-supplied 1.3"...

    I got this working with an Adafruit-supplied 1.3" TFT, ST7789, using the (very recently updated) ST7735_t3 library.

    A couple of things -
    1. Screen redraw seemed faster compared to the Adafruit...
  33. I verified my testbed T3.5 could drive the...

    I verified my testbed T3.5 could drive the earlier OLED I was using, the jumper wires were good, tried every ST7735 I had on hand, tried a multitude of pin combinations (including the example...
  34. Thanks guys for the responses, I'm attempting to...

    Thanks guys for the responses, I'm attempting to get up to speed with the thread pointed out by defragster; that may take me a minute :)

    I understand the value in buying components from a trusted...
  35. Even though this thread pertains to the ST7789, I...

    Even though this thread pertains to the ST7789, I also tried as much as I could follow here since that display driver is shared with the ST7735:...
  36. I've also made sure I select the correct...

    I've also made sure I select the correct initializer in the graphicstest.ino example each time... have also tried all the other options... basically every permutation I could come up with :)
  37. Problems with ST7735 160x80 0.96" SPI Display + Teensy 3.6

    Hi all - Haven't been able to get a generic ST7735 160x80 0.96" SPI Display working with a T3.6 (and now a T3.5 on a breadboard outside of my project).

    This is what it looks like (identical...
  38. A little more testing later and everything is...

    A little more testing later and everything is working great within the main code. Mixing up the libraries probably broke a couple of different methods Id tried.
  39. If you're interested in discussing it, what are...

    If you're interested in discussing it, what are the barriers to turning it into a product, that you consider insurmountable (at least without more effort than perhaps seems worth it)? Just curious...
  40. My barebones example seems to be writing/reading...

    My barebones example seems to be writing/reading files now, after re-aligning my library code around SDfat. There are 3 libraries I'd downloaded between the shuffle of example methods tried - the...
  41. This is the compiler error: Arduino: 1.8.7...

    This is the compiler error:

    Arduino: 1.8.7 (Mac OS X), TD: 1.44, Board: "Teensy 3.6, Serial + MIDI, 180 MHz, Faster, US English"

    SDcard_struct1: In function 'void saveProgram()':...
  42. Gerrit - First off, your project looks...

    Gerrit -
    First off, your project looks brilliant. Lovely aesthetic and useful ideas. I'd love to try it if I weren't on the other side of the world, and we may have more to talk about since the...
  43. One more thing... I'm really struggling with how...

    One more thing... I'm really struggling with how reference variables and pointers work. No amount of reading seems to make it click. Maybe that's part of my problem with this, I don't know.
    ...
  44. Teensy 3.6 SD card - saving/loading structs?

    Hello all, been at this problem for 3 days now and think it's finally time to ask for help -

    1. What is the simplest way to save a big struct (several variable types and enums, many variables in...
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