Support for Software Serial

[rjjrbatarao]

I trying to implement software serial but couldn't make it work, maybe someone found a way to do it. Its a good addition to ch32 examples

[cnlohr]

What issues did you run into? Software TX should be easy, software RX is likely difficult.

[rjjrbatarao]

I thought I could do some bit banging but I have no idea where to start. Looks like someone has ported onewire slave tx rx protocol #293 (comment) this might be a good reference to start with.