I am starting to build my TinySa.. finally.
First issue...
If you use pin D0(RxD) and D1(TxD) for both Si4432 and USB to the PC, isn't that going to present a conflict?
I have done this before but I had to remove the peripheral (NEO-6) during programming.
TinySA will need to communicate both ways during operation, right?
73,
Gary
WB6OGD