I am having trouble to get the external antenna of my XIAO C6 to work and got to this post.
I am confused about GPIO3. Doesn’t the RF switch chip (FM8625H) need to be enabled regardless of the antenna used?
In other words, according to the schematic (which is pretty confusing due to the crossed-out components) doesn’t the VDD input of the chip always need to set high (and consequently GPIO3 set to 0) for any antennae to work?
After setting GPIO3=0 and GPIO14=1 I was expecting the board to be unable to use WiFi at all without an external antenna plugged-in. However, that’s not the case. I get some erratic WiFi connections, so something is amiss.
Also, WiFi seems to work (also erratically, but it works) regardless of the settings I choose for GPIO3 and 14.
I have confirmed that my GPIO output code works since it turns on the yellow LED if I set GPIO15 to 0.
I may be making wrong assumptions here, but I have a sense that the schematic we have is not precise.