Firmware: ch32x: Mutual Capacitance Touchkey - #499
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Designing a mutual capacitance touchkey PCB is relatively difficult (compared to typical keyboard PCBs).
This firmware is the draft code I've used on a prototype.
Before merging:
Not sure about 'allow using cols for driving, rows for sensing' (in the sense that if I'm not using it, may not be worth using); but, surely that's possible from codegen / CPP.