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Thank you. I did those and looks good to me now.

Thank you. I learned something new. I'm still stuck in 1980's. Is there a better way to implement it than below? There is an __RBIT(uint32_t value) defined in cmsis_gcc.h. uint32_t value = 0x12345678; uint32_t result; asm volatile ("rbit %0, %1" : "=r" (result) : "r" (value) )...

You are looking for a controlled USB hubs such as https://acroname.com/. These USB hubs can be remotely controlled to connect/disconnect power & data lines. We use them for device testing at work. I think there are a few others too.

If you need to reverse bits, FLEXIO module already has several registers that do it automatically. You write it to one register and can read it from a few others that have different bit flippings... This was very handy for my transputer project where I have to reverse 32bits constantly. FYI...

Hurray, I confirm if I redefine all the functions in a core file, then override works. I copied the digital.c from core to the project folder and I can modify the functions without error. One undesired side effect is I have to keep a copy of the original core functions in my project because I...

I posted a message about failure when redefining pinMode and digitalWrite. After rereading your comment, I think I have to redefine ALL the functions in a file. Let me try that and come back. Stay tuned.

I am thinking you were thinking of "variants". Arduino IDE lets one to add variants for the existing boards, with slight modifications to pins definitions and a few core files. I'm going down this path now. It is a mix of options 3 and 4. I will report back once I figure out the details. Thanks...

After spending a bit more into library sources, my learnings are: if library doesn't change pin directions, then we are good. For example, FastLED library works without problems. I think LiquidCrystal also should work (I think it doesn't read from the lcd) but I want to verify on actual hw...

Thank you for your comment. Would you be able to explain this a bit more? I was thinking of a teensy user modifying the library source files they downloaded (both in Arduino Library/ folder and/or platformio's library folders). This means everybody has to modify their libraries and redo it...

It turns out we need the override :( - There are existing Arduino libraries (for example LiquidCrystal) that use pinMode(), digitalWrite(), digitalRead().

Hi, I'm working on a "yet another" adapter board that converts Teensy 4.1 to Arduino Mega 2560 form-factor, with true 5V push-pull signaling. 5V push-pull is done with the circuitry that sits between Teensy 4.1 and the outside world. My goal is to use existing mega shields with teensy 4.1 I...