Fix example not compiling; Update Changelog

[MX682X]

Also, I'd like to point out, that we are already at avrdude 8.0, which has support for PICkit 5 (UPDI only). Probably sensible to update the pipeline on that front.

[nomakewan]

For the maintainer, I would also point out that the single failing compile example is not the fault of the PR submitter, but rather a fluke bug in Github's runner related to its golang JSON parser. Someone had a similar issue here that went unresolved by golang's maintainers: golang/go#55829

So if that single failing check were re-run it would likely succeed.

[SpenceKonde]

Poetry in motion!

Where are the magic names of the register values being pulled from? Like, they sound suspiciously official.

And, sorry to ask again, but ah, do you know anywhere I can go to learn - what the modes available are? Are there any meaningful differences between the pins? The datasheet has basically nothing. Is there another document somewhere? .

The other big question is - what wiring is needed for the modes, both in terms of wiring between sensors (for, if I understand correctly, some of the mutual cap modes?), and what the holy decree is regarding what shape the sensing elements shall take. I've seen all sorts of wonky shapes in touch sensors, some of which I believe were cap touch; I assume Microchip made a recommendation somewhere?

[MX682X]

@SpenceKonde

Where are the magic names of the register values being pulled from? Like, they sound suspiciously official.

Well, here is the fun thing - when you look at the Register definition for the Tiny - the first half is from the official ADC.
This design decision from Atmel (at least that's what's lasered on my Attiny1614) made me understanding the PTC much easier. Knowing what structure member values go where, I was able to cross-reference it with the DA and create the structure there. That's why a lot of the register names are known. The second half is based on what is written to it.

And, sorry to ask again, but ah, do you know anywhere I can go to learn - what the modes available are? Are there any meaningful differences between the pins? The datasheet has basically nothing. Is there another document somewhere?

The pins are pretty much the same, no difference. At most a little deviation in capacitance, which is compensated anyway.

.h files for the qTouch structures can be found here, for example:
https://github.com/microchip-pic-avr-examples/avr128da48-qt7-touch-example-studio/tree/master/avr128da48-qt7-touch-example-studio/qtouch
https://github.com/microchip-pic-avr-examples/attiny3217-t10-touch-example-studio/tree/master/attiny3217-t10-touch-example-studio/qtouch

Best documentation on the hardware I was able to find :
https://ww1.microchip.com/downloads/en/DeviceDoc/DS50002705A%20-%20SAMA5D2%20PTC%20Subsystem%20Firmware%20Users%20Guide.pdf

Sensor design guidelines:
https://www.mouser.com/pdfDocs/QTouch_QTAN0079.pdf

"Secrets of a Successful QTouch™ Design":
https://ww1.microchip.com/downloads/en/Appnotes/an-kd02_103-touch_secrets.pdf