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Once again Paul YOU ARE THE MAN ! Been following this thread for a while and have been amazed at your patience and perseverance. The documentation with the buttons sets a new high bar. That made...

Installed on macOS Catalina 10.15.7
My older programs compiled and seem to run well. Get this new warning:

n file included from...

Installed on macOS Catalina 10.15.7

No new issues so far. Haven't looked at any of the new features but all old stuff seems to work.

Last line of my post above is incorrect. The T4 and T4.1 already have the external crystal. Data sheet Table 4.1.6 suggests 20uA. Not sure why I see 30.

KiCad for sure.
If your a linux user most of the ease of use issues that Mac and Winoz users complain about will be upgrades for you ;)

The worst thing about KiCAD is managing the libraries where...

Thought I was getting defective CR1220 button cell battery's. However, measuring RTC currents:
T3.2 1.24uA
T4.0 30uA

Doesn't seem like much but with a 35mAH, 20mm dia. coin cell battery...

Might be better to change the addresses I don't know.
Otherwise:
In your sketch above change something like:
change MPU6050 to Adafruit_MPU6050 everywhere
accelgyro1.initialize(); to...

Don't think the MPU6050 library is setup to handle anything but wire.
Rather than rewrite the library Iv'e delt with this by putting: #define Wire Wire1 into the offending.cpp library and put that...

@JotaEfe13
Not sure if you have the display hooked up when your having this problem. I see a 'ILI9341_t3 tft = ILI9341_t3(T...'
If the display is hooked up then you must do 'tft.begin();' in...

Haven't tried those particular displays, but have had similar startup issues with others using serial data and long wires. The solution was to add a delay(100) before the lcd.init().

The print...

Curious, 4MHz is the default for SPI if you don't specify it. This could be one of those who's called last mentioned.

Search for onewire in the library manager. It works the same as with any micro.

I was wrong in that post and can't modify it. I now think your using it correctly except maybe the wrong pin.
Try this in a google search: site: forum.pjrc.com T4 SPI CS

You could try...

@BlueTurtle Its looks like your using pin 31 for the SPI CS. Others can comment but I think SPI wants that on pin 10. It may work but not reliably?

One other thing. I had an issue a while ago...

Looks like your not using the TMC2130Stepper object that uses the SPI if that helps anything.

Perhaps when the Rpi is updated to the latest it won't work either? Maybe more error checking or different defaults.

Why is SPI.begin() commented out? Where are SPI pins assigned?

Probably not the issue but latest MacOS is 10.15.6. Usually, the latest of everything is the best bet when something weird is happening, but, otherwise don't change anything:)

My reason for pointing this out is that the Teensy I/O is not as flexible as it might seem at first glance. Certain functions only work or work best on certain pins. SPI only works good on a few...

Hi @PhilB,
Thanks for the quick reply. I really like open source and really like to have things run the way I want them to. Also get tired of things happening or usually not happening with...

Looked over what I could find in your links and have some questions. I'm also curious about what niche you are intending to fill.
I run Gecko Drive G320 DC motor drivers at 20A, 56V with 2024 line...

You probably already have it, but for others out there 'The C Programming Language' by Kernigham and Ritchie, second edition 1988 pretty much handles these kinds of questions. I still use the 1978...

pow(base, exponent)

Sounds like a similar problem I had with a setup used for all sorts of SPI and I2C testing. I would leave everything connected even if I wasn't using it. After occasional issues, especially with...

Don't know about your FRAM but there is something about if just one ram chip it has to be on the smaller pad location.

https://www.pjrc.com/store/psram.html

No problems on Mac Catalina install.

Also installed on Raspberry Pi4 with Debian Buster 4.19. Had issue with libusb-0.1.so.4 similar to but not exactly like...

Sorry for the delay getting back. Where do I find "T4_PowerButton.h"

What beta #5 gives, b #6 taketh away!
The text munging at 24 MHz CPU speed https://forum.pjrc.com/threads/60864-Teensyduino-1-52-Beta-5?p=239150&viewfull=1#post239150 that b5 fixed 6 has reverted.
...

Mac 10.15.4 Catalina, this B5, Teensy4.1 no Xtra chips, installed no problems.

Even inexplicably solves most issues I was having with Franks memory info program...

Has anyone else tried the code posted at #83 https://forum.pjrc.com/threads/57326-T4-0-Memory-trying-to-make-sense-of-the-different-regions?p=227539&viewfull=1#post227539 at 24 MHz? Did you get the...

Having a little issue:
Using the new code in #83 it seems to work fine for T4.0 and T4.1 at >150MHz CPU:

@150MHz:...

With CircuitPython 5.4.0.hex on a Teensy 4.1 the Mac said 7.3Meg available so I copied a 6.2Meg GIMP image file over in 1minute 9 secs. However it opened in about 4 seconds, from GIMP on my Mac, the...

using the CircuitPython 5.3.0.hex on a Teensy 4.1 the Mac said 13Meg? of space available until I tried a 8Meg file then no, and tried smaller until it successfully added a 990 KB file and said 25 KB...

Thanks Frank
That was FAST ! :)

thought there might be more to it than just the defines.

ps. It took me longer to reply than it took you to fix post and reply !

Using the code https://forum.pjrc.com/threads/57326-T4-0-Memory-trying-to-make-sense-of-the-different-regions?p=227539&viewfull=1#post227539 #83 in this thread I get the same output for T4.0 and...

MacOS 10.15.4 Catalina install, no problems, all RTC issues, (and I think I was struggling with all of them) on T4.0 and T4.1 have been resolved. Don't have the spacing issue @KurtE notes above. ...

@defragster, saw that but didn't realize all that info was exposed to #ifdef's
thanks, that does it!

Here's something I noticed that doesn't matter but since your into minutia... :)
...

Mac Catalina, installed great, super easy, however, as mentioned in b2 for newbies the instructions for Catalina on the download page will be very confusing.

Tried many T4 with ILI9341_t3...

-jim,
Can't comment on the crash other than to say I have found it to be as good or better than previous versions, although I too experienced a crash like yours back when I first switched many...

So does sparing use of toilet paper :)

Here's some links to the stuff:
A MK64FX512VLQ12 144 LQFP rated -40°C-105°C for $13

https://www.digikey.com/product-detail/en/nxp-usa-inc/MK64FX512VLQ12/MK64FX512VLQ12-ND/4462057

Paul's board...

@chileflora,
Thats some good data you refer to and your conclusions are reasonable. One thing to note is that the graph is for CeramicBallGridArray's. The package is actually made of ceramic...

@chileflora
I think manufactures have pushed the limits as described above to the point where the failure rate is acceptable to the general public. People expect their electronics to last a few...

@chileflora,
I was trying to be humorous. As I pointed out everybody uses bga parts. Just don't expect the parts to last forever. On the bright side I should have mentioned above that the cold...

@chileflora
Whats the fun of a model airplane hobby without a few crashes :D

You might find this interesting....

luni, well that was embarrassing

thanks

Back in post https://forum.pjrc.com/threads/59112-TeensyTimerTool?p=227079&viewfull=1#post227079 the code above added volatile.
I thought when accessing or changing a volatile variable in the main...

Rezo, you don't need to do anything else. It's all pre-installed in the Teensyduino.app when you unzip it. The instructions haven't been updated for the super easy Catalina install. The main odd...

Could someone explain why this works. Should the library have set this?

thanks

Mac Catalina, installed great, super easy, however, for newbies the instructions for Catalina on the download page will be very confusing.

Tried many T4 with ILI9341_t3 programs, T2,3,4 all worked...

I think your correct on that. The table above the schematic is correct.