@dc42 That's great, so do I need to program C code on the Duet 3 FW layer or only configuration on the RR FW layer? I am still not really familiar with that. This is my first time using Duet 3 and needs so big modification.
What I need is control of the heater, fans, and extruder but with no integrated stepper driver. So everything on Toolborad should stay the same, only the information for motor needs via UART.
Do you have some documentation where can I find some hints close to my needs?
Thank you very much, BR
Pavel.

Hello, thank you for your fast reply.
Regarding the IOs, I found this table so if I understand well, IO_0 in/out should be used with no problem.
Anyway, the bigger issue is coding. Is possible to make it some easy way or I need to make my own UART library.

Hello everyone.

I would like to modify Duet 3 Toolboard. Everything as is, only without using a TMC motor driver. I need UART output with simple information (words) including CW/CCW direction, speed, and final position.
Is possible to remap IO2 for that application?

After some reading of the forum and firmware on GitHub, I become a bit lost. Do you have some recommendations on how to do it and hints where to start?

Of course, the easiest way is to use Step/Dir from the board, but I still hope there should be some not too much difficult way how to do via UART.

Thank you, best regards
Pavel.