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Nathan, curious how that turned out. I want to use a 4.1 with a similar RM58 encoder to Matthew's. Any code you have to share would be welcome. Thanks, Bryan

Awesome project, just stumbled onto this. I may have to make one in the near future...

Thanks for the information. This comment in that interrupt.c file made me question if I should be using pins 6-9 instead of 9-12, or maybe avoiding them instead. I just wasn't quite sure what to make of it as I also ran into a similar comment someplace else when searching in regards to this...

Are all pins equal in response times for a digital transition on a T4.1? I am setting no more than four interrupts active at a time to watch for either rising or falling edges. For example: void turn_on_coil2_fwd() { if (!coil2_state) { noInterrupts(); digitalWriteFast(HB2_ON_GPIO...

Returned... now to find a 20x4 LCD that actually works good. I re-arranged the PCB so I can use Wire0 to make code use simpler, and then ran the clock and data lines through a voltage translator to boost them to 5v.

Board arrived today! The timing looks much better. Pleased so far. < 500 ns count is 999999 < 750 ns count is 1 < 1000 ns count is 0 < 1500 ns count is 0 .... Sum of counts is 1000000 Bryan

I think I'll just return it and look for another with a more standard chipset.

Thanks, I'll take a look at that. This one was sold by RPIGear. I'm trying to find out what chipset it uses (on the underside of the backpack) and is a 20 pin chip. A 2004A display with possibly a PIC16LF1829-I/SS chip.

What libraries work with a T4.1 with a I2C Wire2 output for the common 20x4 LCD panels? So far I'm batting zero with the ones I've tried. Some are supposed to let you override the default, but either that isn't documented or I picked the wrong ones. Many seem to conflict with the...

Here's my colorized version of KillerBug's (Zack Kummer) great Teensy 4.1 model: Teensy_4.1_Assembly.STEP Warning: 19Mb :-)

Thanks, that looks like it will work great. I've integrated the code changes and will give it a test and post the results after the board gets here next week. I also have a second version of the code now using both hardware interrupts and timer interrupts instead of running a hard loop. It will...

Awesome - thanks everyone. I had found bits and pieces but not that reference to put it all together. Moving to a micro-controller environment with a single program running is a bit like going back to my early programming on my TI-99/4A in K&R C (super macro assembler). One program with nothing...

I'm converting C code from a PI 4 to a Teensy 4.1. For the PI I use this to get the full time to nanoseconds: struct timespec gettime_now; long long f1_on_time; clock_gettime(CLOCK_REALTIME, &gettime_now); f1_on_time = (((long long)gettime_now.tv_sec*1000000000)+(long...