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I still have not completed my custom board, but it is coming soon. It won't be something I can offer up here (yet). However, I wanted to get the pin library files completed. Here is my stab at this. I realize that what I labeled the pins as may not line up with what you may want for your...

I have seen the recommendation to delete everything at C:\Users\<username>\AppData\Local\Temp\, but it was @jluu 's comment on also deleting items in C:\Users\<username>\AppData\Local\arduino\sketches\ that fixed this for me. IDE 2.3.6, teensy 1.59

I have an older project that has been running just fine on a Teensy 3.6, using i2c_t3. I am getting ready to migrate to a Teensy 4.1, and have decided to clean up a lot of old code, old libraries, etc. This project has several I2C devices running on all three busses. In particular, on the...

Thanks for the link!

I am still waiting in limbo for my boards to come back, which means that I have not been able to test these, however here are my modified files:

Attached is a modified Excel spreadsheet of the extra pins below your original 4.1 design. I added the .txt to the end to allow it to attach, so remove that to open the file. I have not attempted to map additional functions to these extra pins, even though they are capable.

OK, I have modified the files using method #1. I will call this the preliminary solution. I now have several questions. Forgive my ignorance, as I write code well enough to be completely dangerous. I am wondering about a couple of things: 1. Instead of modifying the core library files, is it...

Paul, Thank you for putting this very thorough guide together. That was much more than I was expecting, and I am very appreciative of the time you put in on gathering all of this. Surely I won't be the only one to benefit from this?

I have been working with my hardware layout for quite a while, ad am at a stopping point for a bit. While here, I want to come up with a plan for the software end. With the time that has passed since I first asked the question on additional I/O, more questions have popped up for me. Before I...

Bumping this up, hoping @PaulStoffregen will see it.

Ok, perfect. Parts are getting hard to find. While I have your attention, the 32.767kHz crystal is showing 20pf capacitors on your schematic. Are you sure that is correct? The highest capacitance crystals in that frequency seem to be 12.5pf.

I am building a custom Teensy 4.1 board. W25Q64JVXGIM seems to be having availability problems. I know that the documentation says that the "Q" part numbers are not compatible. Has anyone had success with any of the following: W25Q64JVSSIM W25Q64JWZPIM W25Q64JVZEIMS W25Q64JWSSIM W25Q64JVSFIM

No doubt on the mind boggling. I will try to read more this weekend. I want to sort this out before I begin laying out this portion of the schematics for the new board. Thank you for the help, and keep it rolling, if you think of other things.

That's exactly the kind of information I'm looking for. I completely understand why there are not more of them brought out for the actual Teensy 4.1 board. The board would be enormous, to take all of them! In my case, I can find a home for almost every extra I/O.

This will be a DIY PCB, using the 1062, so I can bring out whatever signals are available to be used (physically).

I have a custom Teensy 4.1 application that I am gearing up for. My application is very I/O intensive. I am looking at the possibility of multiplexing outputs, and I really do not want to do that, if possible. Given that this is custom, would it be possible to map additional I/O out of the...

Kurt (and to anyone else who might hit this issue), You were spot on! Had an array that was initialized, but did not take into account thew NULL, so it was causing the issue. Thank you so much for the lead, it made this...

Thank you, Kurt! That at least gives me a direction to head into. I wish I could out the code up, but management says, "No."

I am using a Teensy 3.6, and am connecting to a PC via USB. I have a program that runs on the PC that sends various commands to the Teensy to get it to do things. In this case, I have a command that sends a hex 0x01, and then a string of hex commands to get it to read a file list of an SD...

Nevermind (I think). Just found your posts in another thread. Many thanks for you work on this!

Kurt, Do you have any links to your fork? I am just now working with the RFM95 version of the LoRa boards from Adafruit on a Teensy 3.6, and would like to run them on SPI1 instead of SPI0. I tried modifying the Radiohead RHSPIDriver, and just wound up screwing it up. I have the chip select on...