XIAO_ESP32C6 Switching between builtin and external antenna

[fons]

@msfujino

Although not explicitly stated in the FM8625H datasheet, it was assumed that ANT-RF1 would conduct if no power was supplied to VDD.

Ah, that can explain it! Although I find it really odd that the datasheet doesn’t state it explicitly since it’s a pretty fundamental behavior.

@msfujino

Also, the isolation between ANT-RF is about 30 dB, so it might be possible to use it with signal leakage, albeit unstable.

Makes sense, thanks! I will conduct some further testing.