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  1. Digikey now has stock of the PSRAM chip...

    Digikey now has stock of the PSRAM chip.
  2. This is how I start things up with SdFat-beta (in...

    This is how I start things up with SdFat-beta (in use since June of this year with no issues):


    SD SdFat;
    .
    .
    .
    if (SD.begin(SdioConfig(FIFO_SDIO))) {
    .
    .
  3. The uSD breakout board that I use with the T4.0...

    The uSD breakout board that I use with the T4.0 has no pullups, and as you've already seen on the T4.1 schematics, the onboard uSD there has none either.

    As for wire lengths, I've got a 2" FFC...
  4. Right there could be a big part of your troubles....

    Right there could be a big part of your troubles. Don't change the config file. I've haven't. Use plain old SdFat file system in your program, and resist the temptation to turn knobs and twiddle with...
  5. I've been using an SDIO connected uSD card with...

    I've been using an SDIO connected uSD card with the T4.0 and T4.1 and the SdFat-beta library, on a daily basis, for many months now. I imagine if there was an issue with the SdFat-beta library, I'd...
  6. The consensus on this thread...

    The consensus on this thread was that it just was an error in the T4.0 schematic.

    When you say you're "having a hard time getting my T4.0 to talk to an SD card", are you using the SDIO pads on the...
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    A 3V coin cell on VBat will maintain the real...

    A 3V coin cell on VBat will maintain the real time clock while the main power is off.
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    I did that as well. DigiKey had the W25Q128JVSIQ...

    I did that as well. DigiKey had the W25Q128JVSIQ FLASH chip and the ESP32-WROVER-B (8MB) so I ordered both. Pried the shield off the ESP32 and removed the PSRAM chip with the aid of some solder wick...
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    I was lucky enough to start accumulating these...

    I was lucky enough to start accumulating these interlocking drawers many decades ago. (I was also lucky enough to add a whole bunch more when my father downsized his workshop.) I'd love to get even...
  10. Ahh, interesting. When DigiKey started stocking...

    Ahh, interesting. When DigiKey started stocking the Teensy 4.1 it was only a day between the entry showing up and stock being available. I'll have to remember to keep an eye on that over the next few...
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    Try this. It's a stripped down version of the...

    Try this. It's a stripped down version of the TimeTeensy3 example (yes it works with Teensy4, don't let the name throw you):


    /*
    * TimeTeensy3.ino
    * example code illustrating Time library...
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    I feel like I'm missing something obvious, but...

    I feel like I'm missing something obvious, but after a quick glance I got this:

    86400 seconds in a day.
    That's 86400000 mSecs in a day.
    unsigned long is 32 bits, with a maximum value of...
  13. What SD library are you using? SD? SdFat? Does it...

    What SD library are you using? SD? SdFat? Does it support a dateTimeCallback function? Did you set it up?
  14. Changing the optimization level can make these...

    Changing the optimization level can make these kinds of warnings pop up and disappear too, resulting in a "what the..." moment. switch() statements that set a variable in all cases followed by code...
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    The same: 1.53 with Arduino 1.8.13. Ran one...

    The same: 1.53 with Arduino 1.8.13.

    Ran one more test with Optimize = Faster, which is the default in the IDE. (I always use Optimize = Fast because, though I can't prove it with a simple example...
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    I loaded up the Test example from USBhost_t36 it...

    I loaded up the Test example from USBhost_t36 it on a T4.1 here and saw +5V on the USB host power pin as soon as I opened the Serial monitor so that the program could start and the USB host object...
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    I can verify that. With just a blink sketch...

    I can verify that. With just a blink sketch loaded, there was no voltage on the USB host +5 pin. Once USBHost_t36 was loaded and enabled the output that switches on USB host power, there was...
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    Sticky: No issues so far with ARM 32 on Raspbian Stretch,...

    No issues so far with ARM 32 on Raspbian Stretch, installed over 1.53b3.
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    And I'll be fairly surprised if that happens. My...

    And I'll be fairly surprised if that happens. My hunch is a marginal solder joint or a bit of flux where it oughtn't to be.
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    Reran the test with Optimize Fast, Optimize...

    Reran the test with Optimize Fast, Optimize Fastest and Smallest Code. All three worked. The only oddity I noticed was that under "Smallest Code" that the result line that usually reads something...
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    Compiled, loaded and ran...

    Compiled, loaded and ran teensy41_psram_memtest.ino w/o modifications or problems with the following setup and settings (some of which I'm sure don't matter but are included for completeness):
    ...
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    Linux ARM on Raspbian Stretch The installer...

    Linux ARM on Raspbian Stretch

    The installer picked up on the fact that I'd modified the udev rule file to add a symlink. And it allowed me to skip the check, which was a nice touch and...
  23. If I was doing this again with the T4.1, I'd...

    If I was doing this again with the T4.1, I'd probably rotate the battery holder 90 degrees and put it as close to the LS245 and 23017 as possible. The T4.1 ought to fit underneath it (from the...
  24. Teensy 4.0 emulation of a Z80 computer running ZCPR3.3/ZSDOS with GSX colour graphics

    Over the winter, I'd started a project to take RunCPM and extend it into a complete computer. One with a RTC, serial and parallel port, an ANSI terminal with colour GSX graphics.

    I just heard...
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    Using 1.53b1 with Raspbian Stretch and Arduino...

    Using 1.53b1 with Raspbian Stretch and Arduino 1.8.13; no problems so far.
  26. Replies
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    From...

    From https://github.com/arduino/Arduino/issues/10345

    Due to a server-side issue yesterday (June 10th), the Arduino IDE failed to start due to downloading corrupt board files. The server-side issue...
  27. And I got my changes to work on the mainline code...

    And I got my changes to work on the mainline code as well. If you want to check anything, I've pushed my changes to https://github.com/mecparts/RunCPM. It's up and running on one of the spare T4.1s....
  28. No trouble at all. I'd just finished a 22km bike...

    No trouble at all. I'd just finished a 22km bike ride before sitting down at the computer so my mind is fresh even if my knees are complaining.

    And right now, grabbing a couple extra 4.1s as soon...
  29. Unfortunately, it's not that easy... I've done...

    Unfortunately, it's not that easy... I've done all this on my own "gone way out in left field" fork of RunCPM. ZCPR3.3, ZSDOS, serial and parallel port (yeah, it's me, mecparts).

    Let me start over...
  30. I think it took me about an hour of skullwork to...

    I think it took me about an hour of skullwork to get things migrated over to SdFat-beta before I got my T4.1 and plugged it in. The increase in speed is very, very noticeable.

    On the T4.0 with the...
  31. Oh right, forgot about all those internal...

    Oh right, forgot about all those internal renaming bits... One sec... dir_t became DirFat_t.

    There was also a function that went private (SD.vwd()) that was used in _sys_renamefile in...
  32. For both the T4.0 and the T4.1, I used SdFat SD;....

    For both the T4.0 and the T4.1, I used SdFat SD;. It worked on the T4.0 and I really never thought of playing with it when I switched over to the 4.1.

    In the SD.begin, I used...
  33. The solution I've come up with is to rename the...

    The solution I've come up with is to rename the SdFat-beta library from SdFat to SdFat-beta: in library.properties change name=SdFat to name=SdFat-beta, rename src/SdFat.h to src/SdFat-beta.h, and...
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    I'm in full agreement with that. And at one time,...

    I'm in full agreement with that. And at one time, that was the way things were done; upgrades didn't break existing functionality. But, like it or not, things are viewed differently now by a lot of...
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    There have been some changes in the ADC library...

    There have been some changes in the ADC library since the snapshot taken when 1.52 was put together. I noticed that at one stage the original methods were put in, but marked deprecated (so they'd...
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    I tried compiling your program for both a T3.6...

    I tried compiling your program for both a T3.6 and a T4.0.

    After declaring some values for readPin and readPin2, it sailed through both pinMode lines, and then errored out on setAveraging,...
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    That white wire should have been delivering 3.3V...

    That white wire should have been delivering 3.3V to that pin (at least it was on mine).

    To the best of my recollection, the middle row of pins across the end of the uSD socket (Vbat, 3.3V, Gnd,...
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    Speculating on a circuit and components I have no...

    Speculating on a circuit and components I have no knowledge of wouldn't help you much I'm afraid. But if that's what you think it might be, a breadboard with just the Teensy and your unnamed...
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    Well, that would have been too easy if that had...

    Well, that would have been too easy if that had been the problem.

    More dumb questions just to cover the obvious things I can think of.

    Did you forget the Wire1.begin();?

    Are you connecting...
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    I've used I2C on both the Teensy 4.0 and 4.1 with...

    I've used I2C on both the Teensy 4.0 and 4.1 with the standard Wire library included with Teensyduino. Haven't seen any hangs when endTransmission() is called. 4.7K pullups on both SDA and SCL.
    ...
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    In my experience at least, it was that. On the...

    In my experience at least, it was that. On the Teensy 4.x, when I moved the changes in my fork of SdFat over to SdFat-beta I probably had about an hour's tinkering to get it back up and running. Most...
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    Just as a check, in the Teensy Loader, does Help...

    Just as a check, in the Teensy Loader, does Help -> About show 1.52-beta-4 or better? I know it sounds unlikely, but there was an earlier case where someone had upgraded, but was still running an...
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    I think there's an extra 0 in the included part...

    I think there's an extra 0 in the included part number on OSH. The 89361-706LF is DigiKey # 609-3139-ND: https://www.digikey.com/products/en?keywords=609-3139-ND (and it's slightly cheaper!).
  44. I believe the spacing of the pins on the ethernet...

    I believe the spacing of the pins on the ethernet connector is 2mm, not 2.54mm.
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    My "Future Teensy" is the 4.1 beta board that...

    My "Future Teensy" is the 4.1 beta board that Canada Post assures me will be here by the end of the week.:)
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    I haven't touched SdFatConfig.h, so that's not...

    I haven't touched SdFatConfig.h, so that's not it. Haven't run any other examples; it already works with my setup (and has for about 7 months now). And this is something that I'm actively using, day...
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    Just as a data point, I've been using a FAT32...

    Just as a data point, I've been using a FAT32 formatted card with SdFat-beta for a while now with absolutely no problems (Teensy 4.0, SPI connection).
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    You could try SD.begin(PIN_SPI_SS,...

    You could try
    SD.begin(PIN_SPI_SS, SD_SCK_MHZ(25)); and seeing what that does. When I started off using the abundant el cheapo uSD adapters found on eBay and Amazon, that's the fastest that I could...
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    No problems with Linux ARM install on Raspbian...

    No problems with Linux ARM install on Raspbian Stretch with Arduino IDE 1.8.12.

    T4.0 clock matched PC time after upload.

    Set PC date/time ahead to Dec 1 2020 14:00 MST (after DST ends) and...
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    This might have nothing to do with the problem...

    This might have nothing to do with the problem you're having, but it's easy enough to check (and easy to fix, as well) so I'll throw it out there.

    A while back I was having trouble with a T4.0...
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