Write firmware for the Ferris keyboard (#9634)

* Write firmware for the Ferris keyboard

Took inspiration from the gergoplex and the ergodox_ez firmware for the
split matrix with io_expander on the right hand.
Cleaned up a lot of bit fiddling on the mcu side by taking inspiration
from the `split_custom` in quantum.
Still bit fiddling on the mcp side as it is particularly natural to do
so with the abstractions provided by the i2c protocol. Would be good to
clean that up and abstract away the wiring from the generic i2c code in
a similar fashion as quantum and the mcp side behave.

One improvement over the ergodox_ez and the gergoplex firmwares is that
the wiring is straight forward as opposed to swapping rows and columns
in two different places that end up cancelling out for some reason.

At this stage, I have flashed this firmware to a board and have verified
that all keys are behaving as intended by shorting pins.
I still have to solder in some switches and test that everything works
correctly at normal typing speeds, but I don't expect any major issues
given I'm building up on previous effort, including the debouncing code
from the ergodox_ez.

* Remove rotation from info.json and label the keys as per default keymap

* Comply with minor review feedback points

* Use CUSTOM_MATRIX=lite to remove boilerplate

* Update keyboards/handwired/ferris/info.json

Didn't play nicely in the configurator

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove MIDI_ENABLE from rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove FAUXCLICKY_ENABLE from rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Prefer wait_ms over _delay_ms

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove unused include

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove unused include

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove unused include

Co-authored-by: Ryan <fauxpark@gmail.com>

* Remove unused includeh

Co-authored-by: Ryan <fauxpark@gmail.com>

* Use dprint over print and remove include for print.h

* Remove all unused includes

* Remove unused code

* Cleanups thanks to code review

* Move more personal settings from the ferris config to the default keymap config

These setting happen to be unused in the default keymap at the moment,
as it has only one layer with no homerow modifiers and no mouse key; but
I would like to keep it there for two reasons:
* It can serve as an example to people creating their own keymap
* I plan to design a more usable default keymap that uses these features
  once this PR which adds the Ferris keyboard is merged.

* Consolidate mcp logic inside matrix.c

Co-authored-by: Ryan <fauxpark@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/keyboards/handwired/ferris/readme.md b/keyboards/handwired/ferris/readme.md
new file mode 100644
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+++ b/keyboards/handwired/ferris/readme.md
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+# Ferris
+
+![Ferris, top view](https://imgur.com/V4QuaGs.jpg)
+![Ferris, bottom view](https://i.imgur.com/7DJYME8.jpg)
+
+A split 34 keys column staggered keyboard named and decorated after the rustlang mascott. All PCB files and some thoughts on the design are available on the [project's github page](https://github.com/pierrechevalier83/ferris)
+
+* Keyboard Maintainer: [Pierre Chevalier](https://github.com/pierrechevalier83)
+* Hardware Supported: Ferris PCB
+* Hardware Availability: Still in prototype stage
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/ferris:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).