UPDITERM: Serial debugging directly via serialUPDI (no extra HW required, not using ATtiny Rx/Tx)

[ArnieO]

I just stumbled over this nice tool that enables me to do printf() from Arduino code to do debugging:
https://github.com/streef/upditerm

The author writes:
Upditerm is a terminal program similar to miniterm, but instead of connecting directly to a serial port, it uses a serial port wired as a UPDI interface to access a virtual UART on the target CPU. You can use upditerm to interact with a program on an AVR microcontroller using only the UPDI interface.

As it was not evident for me how to use it, I wrote this: streef/upditerm#1 (comment)

[hmeijdam]

I found it a nice trick. We discussed it in this discussion

[ArnieO]

Thanks! I did a search yesterday before posting but did not find that discussion.