Yea, I got that part. (This driver is epic btw). Is there a video or wiki article that I can look at, which describes Single Wire UART? Does the G120 even support that configuration? the driver says that it has to send TxD to HiZ to receive data.
Also, the driver automatically figures out the baud rate! How cool is that!
Just connect the SWIOP pin to both TX and RX on the micro. From 1.2.2:
The single wire interface allows differential operation similar to RS485 (using SWIOP and SWION) or single wire interfacing (leaving open SWION). It can be driven by any standard UART.
So just connecting SWIOP to both is the plan. They do talk about using a pullup to 1/2 VDD for SWION on 3v3 systems.
That won’t work as the TX from the micro will be a driven output so that the TX from the device won’t be able to drive the line. You need to use an open collector driver for this with a pull-up. RX can be connected direct and you just handle the TX reflected data in software.