I have a similar question that relates. The nRF52840 has two UARTE’s and a USB. Serial and Serial1. I need two UART’s. It appears I can set up a RX/TX on D0 and D1. I’m not sure but I believe the standard Xiao nRF setup uses Serial for the Arudino USB connection. So that in standard set up, Serial1 is on D6 D7. But Adafruit has a TinyUSB that is my understand uses the nRF USB to send and receive serial data.
If, this is true, does this mean I can set up serial as D0 D1?
If not, there appears to be a software serial class called MySerial I don’t know how it works but my 2nd serial port has low demand for fast serial comms, so it might work.
Any suggestions?