> I’m confused that in embassy the pin is never configured (OpenDrainConfig). Does all the magic happen in saadc::ChannelConfig::single_ended(p.P0_05) ?

seems the microphone has 2 pins:
- mic_run, P0_20: you need to set this to high to turn on the mic
- mic_in, P0_05: you need to use ADC to read this to get the mic data