I just got my minima board today in the mail I have not had much of any time to do anything with it yet. My goal is to get GRBL loaded onto it. The goal is to have it replace the current arduino UNO that is driving my laser etcher. There are a few extra I/O's that "COULD" be accessed in the code. to maybe add a 4th real axis to the stanard cnc stepper motor HAT for the arduino uno. I have only just solved getting the arduino IDE to see the MINIMA board. And the online web paged based code editor to see the board. I'm looking for help in getting the MINIMA setup with GRBL as a drop in replacement for the aging arduino UNO. with the atmel 328. This is the CNC laser etcher I built. And I would like to upgrade it with this much higher laser cutter. https://photos.app.goo.gl/1ejmwQjHGskbBvob9 My laser etcher.
"The controller is written in highly optimized C utilizing every clever feature of the AVR-chips to achieve precise timing and asynchronous operation. It is able to maintain up to 30kHz of stable, jitter free control pulses."
To run GRBL on a RA4M1 UNO R4 board it will need a dedicated code port, by someone who knows the bare-metal functions of the ATmega328 and the RA4M1... I am sure there are people who will do it "just because" however it is weeks of work, if not months by the time one has done all the testing to make sure everything is 100% working correctly.
CNC machines are by the nature very unforgiving if something goes wrong with the g-code movement controller.
As to Arduino boards I have run GRBL on both a UNO R3 and a Mega2560, there are other implementations too - search for grblHALfor info.
I'm just surprised no one has posted any plans or anything in regards to going down this path. An other option would/could be FluidNC for the uno R4 boards. I'm just not much of a coder at all. User end I'm top notch for design and cnc milling laser etching and everything else inbetween etc....
Probably because GRBL on STM32 / LGT8F328P / ESP32 (FluidNC) already exist and the hardware is cheaper than Uno R4 ?
I am moving to using this version:
https://forum.pjrc.com/threads/61622-Teensy-4-1-Based-CNC-Controller
And Phil kindly shared the Gerbers, so I got 5 boards made by JLCPCB - which I have been then able to modify to my requirements as I am building them up.
I use the Teensy 4.1 in several of my scientific instrumentation projects, so it was a natural choice for me.